feat: investment accounts

2026-05-22 14:49:57 +00:00 · 2026-05-22 14:49:57 +00:00 · 7c24a8302d
commit 7c24a8302d
parent f444a074bc
25 changed files with 2205 additions and 56 deletions
--- a/internal/app/app.go
+++ b/internal/app/app.go
@ -27,6 +27,7 @@ type App struct {
 	AuditLogService       *service.SpaceAuditLogService
 	TxAuditLogService     *service.TransactionAuditLogService
 	AccountActivitySvc    *service.AccountActivityService
+	InvestmentService     *service.InvestmentService
 	AccountDeletionWorker *worker.AccountDeletionWorker
 }

@ -56,6 +57,9 @@ func New(cfg *config.Config) (*App, error) {
 	txAuditLogRepository := repository.NewTransactionAuditLogRepository(database)
 	recurringEventRepository := repository.NewRecurringEventRepository(database)
 	accountDeletionRequestRepo := repository.NewAccountDeletionRequestRepository(database)
+	contributionRoomRepo := repository.NewInvestmentContributionRoomRepository(database)
+	holdingRepo := repository.NewInvestmentHoldingRepository(database)
+	tradeRepo := repository.NewInvestmentTradeRepository(database)

 	// Services
 	emailService := service.NewEmailService(
@ -94,6 +98,7 @@ func New(cfg *config.Config) (*App, error) {
 	)
 	inviteService := service.NewInviteService(invitationRepository, spaceRepository, userRepository, emailService, auditLogService)
 	recurringEventService := service.NewRecurringEventService(recurringEventRepository, transactionService, accountService)
+	investmentService := service.NewInvestmentService(accountRepository, contributionRoomRepo, holdingRepo, tradeRepo, transactionRepository)

 	return &App{
 		Cfg:                   cfg,
@ -110,6 +115,7 @@ func New(cfg *config.Config) (*App, error) {
 		AuditLogService:       auditLogService,
 		TxAuditLogService:     txAuditLogService,
 		AccountActivitySvc:    accountActivityService,
+		InvestmentService:     investmentService,
 		AccountDeletionWorker: accountDeletionWorker,
 	}, nil
 }
--- a/internal/db/migrations/00019_add_investment_tracking.sql
+++ b/internal/db/migrations/00019_add_investment_tracking.sql
@ -0,0 +1,50 @@
+-- +goose Up
+-- +goose StatementBegin
+ALTER TABLE accounts
+    ADD COLUMN is_investment BOOLEAN NOT NULL DEFAULT FALSE,
+    ADD COLUMN investment_subtype TEXT NULL;
+
+CREATE TABLE investment_contribution_rooms (
+    account_id TEXT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+    year INTEGER NOT NULL,
+    room_amount TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (account_id, year)
+);
+
+CREATE TABLE investment_holdings (
+    id TEXT NOT NULL PRIMARY KEY,
+    account_id TEXT NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+    symbol TEXT NOT NULL,
+    display_name TEXT NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE (account_id, symbol)
+);
+
+CREATE TABLE investment_trades (
+    id TEXT NOT NULL PRIMARY KEY,
+    holding_id TEXT NOT NULL REFERENCES investment_holdings(id) ON DELETE CASCADE,
+    type TEXT NOT NULL,
+    quantity TEXT NOT NULL,
+    price_per_unit TEXT NOT NULL,
+    fees TEXT NULL,
+    occurred_at TIMESTAMP NOT NULL,
+    notes TEXT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_investment_trades_holding_id_occurred_at
+    ON investment_trades (holding_id, occurred_at);
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP TABLE investment_trades;
+DROP TABLE investment_holdings;
+DROP TABLE investment_contribution_rooms;
+ALTER TABLE accounts
+    DROP COLUMN investment_subtype,
+    DROP COLUMN is_investment;
+-- +goose StatementEnd
--- a/internal/handler/investment.go
+++ b/internal/handler/investment.go
@ -0,0 +1,348 @@
+package handler
+
+import (
+	"log/slog"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/shopspring/decimal"
+
+	"git.juancwu.dev/juancwu/budgit/internal/ctxkeys"
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/routeurl"
+	"git.juancwu.dev/juancwu/budgit/internal/service"
+	"git.juancwu.dev/juancwu/budgit/internal/ui"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/blocks"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/pages"
+)
+
+type investmentHandler struct {
+	accountService    *service.AccountService
+	spaceService      *service.SpaceService
+	investmentService *service.InvestmentService
+}
+
+func NewInvestmentHandler(
+	accountService *service.AccountService,
+	spaceService *service.SpaceService,
+	investmentService *service.InvestmentService,
+) *investmentHandler {
+	return &investmentHandler{
+		accountService:    accountService,
+		spaceService:      spaceService,
+		investmentService: investmentService,
+	}
+}
+
+func (h *investmentHandler) loadInvestmentAccount(w http.ResponseWriter, r *http.Request) (*model.Account, bool) {
+	spaceID := r.PathValue("spaceID")
+	accountID := r.PathValue("accountID")
+	account, err := h.accountService.GetAccount(accountID)
+	if err != nil || account.SpaceID != spaceID {
+		ui.Render(w, r, pages.NotFound())
+		return nil, false
+	}
+	if !account.IsInvestment {
+		ui.Render(w, r, pages.NotFound())
+		return nil, false
+	}
+	return account, true
+}
+
+// HandleSetContributionRoom upserts the room amount for a year, then returns
+// the refreshed investment section so the page can swap it in place.
+func (h *investmentHandler) HandleSetContributionRoom(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+
+	year, err := strconv.Atoi(strings.TrimSpace(r.FormValue("year")))
+	if err != nil || year < 1900 || year > 9999 {
+		http.Error(w, "invalid year", http.StatusBadRequest)
+		return
+	}
+	roomStr := strings.TrimSpace(r.FormValue("room"))
+	room, err := decimal.NewFromString(roomStr)
+	if err != nil || room.IsNegative() {
+		http.Error(w, "invalid room amount", http.StatusBadRequest)
+		return
+	}
+	if err := h.investmentService.SetContributionRoom(account.ID, year, room); err != nil {
+		slog.Error("failed to set contribution room", "error", err, "account_id", account.ID)
+		http.Error(w, "could not save room", http.StatusInternalServerError)
+		return
+	}
+	h.renderSection(w, r, account, year)
+}
+
+func (h *investmentHandler) renderSection(w http.ResponseWriter, r *http.Request, account *model.Account, year int) {
+	summary, err := h.investmentService.SummarizeAccount(account.ID, year)
+	if err != nil {
+		slog.Error("failed to summarize investment account", "error", err, "account_id", account.ID)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	positions, err := h.investmentService.HoldingPositions(account.ID)
+	if err != nil {
+		slog.Error("failed to load positions", "error", err, "account_id", account.ID)
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+	ui.Render(w, r, blocks.InvestmentSection(blocks.InvestmentSectionProps{
+		SpaceID:   account.SpaceID,
+		AccountID: account.ID,
+		Currency:  account.Currency,
+		Summary:   summary,
+		Positions: positions,
+	}))
+}
+
+// ---------- Holdings ----------
+
+func (h *investmentHandler) CreateHoldingPage(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	space, err := h.spaceService.GetSpace(account.SpaceID)
+	if err != nil {
+		ui.Render(w, r, pages.NotFound())
+		return
+	}
+	ui.Render(w, r, pages.InvestmentHoldingFormPage(pages.InvestmentHoldingFormPageProps{
+		SpaceID:     space.ID,
+		SpaceName:   space.Name,
+		AccountID:   account.ID,
+		AccountName: account.Name,
+	}))
+}
+
+func (h *investmentHandler) HandleCreateHolding(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	symbol := strings.ToUpper(strings.TrimSpace(r.FormValue("symbol")))
+	displayName := strings.TrimSpace(r.FormValue("display_name"))
+	if symbol == "" {
+		http.Error(w, "symbol required", http.StatusBadRequest)
+		return
+	}
+	if _, err := h.investmentService.CreateHolding(account.ID, symbol, displayName); err != nil {
+		slog.Error("failed to create holding", "error", err)
+		http.Error(w, "could not create holding", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("HX-Redirect", routeurl.URL(
+		"page.app.spaces.space.accounts.account.overview",
+		"spaceID", account.SpaceID, "accountID", account.ID,
+	))
+	w.WriteHeader(http.StatusOK)
+}
+
+func (h *investmentHandler) HoldingDetailPage(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	holdingID := r.PathValue("holdingID")
+	holding, err := h.investmentService.GetHolding(holdingID)
+	if err != nil || holding.AccountID != account.ID {
+		ui.Render(w, r, pages.NotFound())
+		return
+	}
+	pos, err := h.investmentService.HoldingPosition(holdingID)
+	if err != nil {
+		slog.Error("failed to load holding position", "error", err)
+		ui.RenderError(w, r, "Failed to load holding", http.StatusInternalServerError)
+		return
+	}
+	trades, err := h.investmentService.ListTrades(holdingID)
+	if err != nil {
+		slog.Error("failed to load trades", "error", err)
+		trades = nil
+	}
+	space, err := h.spaceService.GetSpace(account.SpaceID)
+	if err != nil {
+		ui.Render(w, r, pages.NotFound())
+		return
+	}
+	ui.Render(w, r, pages.InvestmentHoldingDetailPage(pages.InvestmentHoldingDetailProps{
+		SpaceID:     space.ID,
+		SpaceName:   space.Name,
+		AccountID:   account.ID,
+		AccountName: account.Name,
+		Currency:    account.Currency,
+		Position:    *pos,
+		Trades:      trades,
+	}))
+}
+
+func (h *investmentHandler) HandleDeleteHolding(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	holdingID := r.PathValue("holdingID")
+	holding, err := h.investmentService.GetHolding(holdingID)
+	if err != nil || holding.AccountID != account.ID {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	if err := h.investmentService.DeleteHolding(holdingID); err != nil {
+		slog.Error("failed to delete holding", "error", err)
+		http.Error(w, "could not delete holding", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("HX-Redirect", routeurl.URL(
+		"page.app.spaces.space.accounts.account.overview",
+		"spaceID", account.SpaceID, "accountID", account.ID,
+	))
+	w.WriteHeader(http.StatusOK)
+}
+
+// ---------- Trades ----------
+
+func (h *investmentHandler) HandleCreateTrade(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	holdingID := r.PathValue("holdingID")
+	holding, err := h.investmentService.GetHolding(holdingID)
+	if err != nil || holding.AccountID != account.ID {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+
+	tradeType := strings.ToLower(strings.TrimSpace(r.FormValue("type")))
+	if !model.IsValidInvestmentTradeType(tradeType) {
+		http.Error(w, "invalid trade type", http.StatusBadRequest)
+		return
+	}
+	qty, err := decimal.NewFromString(strings.TrimSpace(r.FormValue("quantity")))
+	if err != nil || !qty.IsPositive() {
+		http.Error(w, "invalid quantity", http.StatusBadRequest)
+		return
+	}
+	price, err := decimal.NewFromString(strings.TrimSpace(r.FormValue("price")))
+	if err != nil || price.IsNegative() {
+		http.Error(w, "invalid price", http.StatusBadRequest)
+		return
+	}
+	var feesPtr *decimal.Decimal
+	if feesStr := strings.TrimSpace(r.FormValue("fees")); feesStr != "" {
+		fees, err := decimal.NewFromString(feesStr)
+		if err != nil || fees.IsNegative() {
+			http.Error(w, "invalid fees", http.StatusBadRequest)
+			return
+		}
+		feesPtr = &fees
+	}
+	occurredAt := time.Now()
+	if dateStr := strings.TrimSpace(r.FormValue("occurred_at")); dateStr != "" {
+		t, err := time.Parse("2006-01-02", dateStr)
+		if err != nil {
+			http.Error(w, "invalid date", http.StatusBadRequest)
+			return
+		}
+		occurredAt = t
+	}
+	var notesPtr *string
+	if notes := strings.TrimSpace(r.FormValue("notes")); notes != "" {
+		notesPtr = &notes
+	}
+
+	if _, err := h.investmentService.RecordTrade(service.RecordTradeInput{
+		HoldingID:    holdingID,
+		Type:         model.InvestmentTradeType(tradeType),
+		Quantity:     qty,
+		PricePerUnit: price,
+		Fees:         feesPtr,
+		OccurredAt:   occurredAt,
+		Notes:        notesPtr,
+	}); err != nil {
+		slog.Error("failed to record trade", "error", err)
+		http.Error(w, "could not record trade", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("HX-Redirect", routeurl.URL(
+		"page.app.spaces.space.accounts.account.investments.holdings.holding",
+		"spaceID", account.SpaceID, "accountID", account.ID, "holdingID", holdingID,
+	))
+	w.WriteHeader(http.StatusOK)
+}
+
+func (h *investmentHandler) HandleDeleteTrade(w http.ResponseWriter, r *http.Request) {
+	account, ok := h.loadInvestmentAccount(w, r)
+	if !ok {
+		return
+	}
+	holdingID := r.PathValue("holdingID")
+	tradeID := r.PathValue("tradeID")
+	trade, err := h.investmentService.GetTrade(tradeID)
+	if err != nil || trade.HoldingID != holdingID {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	holding, err := h.investmentService.GetHolding(holdingID)
+	if err != nil || holding.AccountID != account.ID {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	if err := h.investmentService.DeleteTrade(tradeID); err != nil {
+		slog.Error("failed to delete trade", "error", err)
+		http.Error(w, "could not delete trade", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("HX-Redirect", routeurl.URL(
+		"page.app.spaces.space.accounts.account.investments.holdings.holding",
+		"spaceID", account.SpaceID, "accountID", account.ID, "holdingID", holdingID,
+	))
+	w.WriteHeader(http.StatusOK)
+}
+
+// ---------- Top-level /app/investments page ----------
+
+func (h *investmentHandler) InvestmentsOverviewPage(w http.ResponseWriter, r *http.Request) {
+	user := ctxkeys.User(r.Context())
+	if user == nil {
+		ui.Render(w, r, pages.NotFound())
+		return
+	}
+	accounts, err := h.accountService.InvestmentAccountsForUser(user.ID)
+	if err != nil {
+		slog.Error("failed to list investment accounts", "error", err)
+		ui.RenderError(w, r, "Failed to load investments", http.StatusInternalServerError)
+		return
+	}
+	year := time.Now().Year()
+	rows := make([]pages.InvestmentOverviewRow, 0, len(accounts))
+	for _, acc := range accounts {
+		summary, err := h.investmentService.SummarizeAccount(acc.ID, year)
+		if err != nil {
+			slog.Error("failed to summarize account", "error", err, "account_id", acc.ID)
+			continue
+		}
+		space, err := h.spaceService.GetSpace(acc.SpaceID)
+		spaceName := acc.SpaceID
+		if err == nil {
+			spaceName = space.Name
+		}
+		rows = append(rows, pages.InvestmentOverviewRow{
+			SpaceID:     acc.SpaceID,
+			SpaceName:   spaceName,
+			AccountID:   acc.ID,
+			AccountName: acc.Name,
+			Currency:    acc.Currency,
+			Summary:     summary,
+		})
+	}
+	ui.Render(w, r, pages.InvestmentsOverviewPage(pages.InvestmentsOverviewProps{
+		Year: year,
+		Rows: rows,
+	}))
+}
--- a/internal/handler/space.go
+++ b/internal/handler/space.go
@ -30,6 +30,7 @@ type spaceHandler struct {
 	auditLogService    *service.SpaceAuditLogService
 	txAuditLogService  *service.TransactionAuditLogService
 	accountActivitySvc *service.AccountActivityService
+	investmentService  *service.InvestmentService
 }

 func NewSpaceHandler(
@ -41,6 +42,7 @@ func NewSpaceHandler(
 	auditLogService *service.SpaceAuditLogService,
 	txAuditLogService *service.TransactionAuditLogService,
 	accountActivitySvc *service.AccountActivityService,
+	investmentService *service.InvestmentService,
 ) *spaceHandler {
 	return &spaceHandler{
 		spaceService:       spaceService,
@ -51,6 +53,7 @@ func NewSpaceHandler(
 		auditLogService:    auditLogService,
 		txAuditLogService:  txAuditLogService,
 		accountActivitySvc: accountActivitySvc,
+		investmentService:  investmentService,
 	}
 }

@ -236,11 +239,15 @@ func (h *spaceHandler) HandleCreateAccount(w http.ResponseWriter, r *http.Reques
 	if currencyInput == "" {
 		currencyInput = currency.Default
 	}
+	isInvestment := r.FormValue("is_investment") == "1"
+	subtypeInput := strings.ToLower(strings.TrimSpace(r.FormValue("investment_subtype")))

 	formProps := forms.CreateAccountProps{
 		SpaceID:           spaceID,
 		Name:              nameInput,
 		Currency:          currencyInput,
+		IsInvestment:      isInvestment,
+		InvestmentSubtype: subtypeInput,
 	}

 	hasErr := false
@ -252,6 +259,10 @@ func (h *spaceHandler) HandleCreateAccount(w http.ResponseWriter, r *http.Reques
 		formProps.CurrencyErr = "Choose a supported currency."
 		hasErr = true
 	}
+	if isInvestment && !model.IsValidInvestmentSubtype(subtypeInput) {
+		formProps.SubtypeErr = "Choose an account type."
+		hasErr = true
+	}
 	if hasErr {
 		ui.Render(w, r, forms.CreateAccount(formProps))
 		return
@ -277,7 +288,14 @@ func (h *spaceHandler) HandleCreateAccount(w http.ResponseWriter, r *http.Reques
 	if user != nil {
 		actorID = user.ID
 	}
-	account, err := h.accountService.CreateAccount(spaceID, nameInput, currencyInput, actorID)
+	account, err := h.accountService.CreateAccount(service.CreateAccountInput{
+		SpaceID:           spaceID,
+		Name:              nameInput,
+		CurrencyCode:      currencyInput,
+		IsInvestment:      isInvestment,
+		InvestmentSubtype: subtypeInput,
+		ActorID:           actorID,
+	})
 	if err != nil {
 		slog.Error("failed to create account", "error", err, "space_id", spaceID)
 		formProps.GeneralErr = "Something went wrong. Please try again."
@ -329,7 +347,7 @@ func (h *spaceHandler) SpaceAccountPage(w http.ResponseWriter, r *http.Request)
 		allocSummary = nil
 	}

-	ui.Render(w, r, pages.SpaceAccountPage(pages.SpaceAccountPageProps{
+	props := pages.SpaceAccountPageProps{
 		SpaceID:                   spaceID,
 		SpaceName:                 space.Name,
 		AccountID:                 accountID,
@ -339,7 +357,24 @@ func (h *spaceHandler) SpaceAccountPage(w http.ResponseWriter, r *http.Request)
 		RecentTransactions:        recent,
 		NonEditableTransactionIDs: h.nonEditableTransactionIDs(recent),
 		AllocationSummary:         allocSummary,
-	}))
+	}
+	if account.IsInvestment {
+		year := time.Now().Year()
+		summary, err := h.investmentService.SummarizeAccount(accountID, year)
+		if err != nil {
+			slog.Error("failed to summarize investment account", "error", err, "account_id", accountID)
+		} else {
+			props.InvestmentSummary = summary
+		}
+		positions, err := h.investmentService.HoldingPositions(accountID)
+		if err != nil {
+			slog.Error("failed to load holding positions", "error", err, "account_id", accountID)
+		} else {
+			props.InvestmentPositions = positions
+		}
+	}
+
+	ui.Render(w, r, pages.SpaceAccountPage(props))
 }

 func (h *spaceHandler) SpaceAccountTransactionsPage(w http.ResponseWriter, r *http.Request) {
@ -757,12 +792,18 @@ func (h *spaceHandler) SpaceAccountSettingsPage(w http.ResponseWriter, r *http.R
 		return
 	}

+	subtype := ""
+	if account.InvestmentSubtype != nil {
+		subtype = *account.InvestmentSubtype
+	}
 	ui.Render(w, r, pages.SpaceAccountSettingsPage(pages.SpaceAccountSettingsPageProps{
 		SpaceID:           spaceID,
 		SpaceName:         space.Name,
 		AccountID:         accountID,
 		AccountName:       account.Name,
 		AccountCurrency:   account.Currency,
+		IsInvestment:      account.IsInvestment,
+		InvestmentSubtype: subtype,
 		UpdateForm: forms.UpdateAccountProps{
 			SpaceID:   spaceID,
 			AccountID: accountID,
@ -776,6 +817,35 @@ func (h *spaceHandler) SpaceAccountSettingsPage(w http.ResponseWriter, r *http.R
 	}))
 }

+func (h *spaceHandler) HandleSetInvestmentFlag(w http.ResponseWriter, r *http.Request) {
+	spaceID := r.PathValue("spaceID")
+	accountID := r.PathValue("accountID")
+	account, err := h.accountService.GetAccount(accountID)
+	if err != nil || account.SpaceID != spaceID {
+		ui.Render(w, r, pages.NotFound())
+		return
+	}
+
+	isInvestment := r.FormValue("is_investment") == "1"
+	subtype := strings.ToLower(strings.TrimSpace(r.FormValue("investment_subtype")))
+
+	user := ctxkeys.User(r.Context())
+	actorID := ""
+	if user != nil {
+		actorID = user.ID
+	}
+	if err := h.accountService.SetInvestmentFlag(accountID, isInvestment, subtype, actorID); err != nil {
+		slog.Error("failed to update investment flag", "error", err, "account_id", accountID)
+		http.Error(w, "could not update", http.StatusBadRequest)
+		return
+	}
+	w.Header().Set("HX-Redirect", routeurl.URL(
+		"page.app.spaces.space.accounts.account.settings",
+		"spaceID", spaceID, "accountID", accountID,
+	))
+	w.WriteHeader(http.StatusOK)
+}
+
 func (h *spaceHandler) HandleRenameAccount(w http.ResponseWriter, r *http.Request) {
 	spaceID := r.PathValue("spaceID")
 	accountID := r.PathValue("accountID")
--- a/internal/model/financial_management.go
+++ b/internal/model/financial_management.go
@ -12,10 +12,31 @@ type Account struct {
 	SpaceID           string          `db:"space_id"`
 	Balance           decimal.Decimal `db:"balance"`
 	Currency          string          `db:"currency"`
+	IsInvestment      bool            `db:"is_investment"`
+	InvestmentSubtype *string         `db:"investment_subtype"`
 	CreatedAt         time.Time       `db:"created_at"`
 	UpdatedAt         time.Time       `db:"updated_at"`
 }

+type InvestmentSubtype string
+
+const (
+	InvestmentSubtypeTFSA     InvestmentSubtype = "tfsa"
+	InvestmentSubtypeRRSP     InvestmentSubtype = "rrsp"
+	InvestmentSubtypeFHSA     InvestmentSubtype = "fhsa"
+	InvestmentSubtypePersonal InvestmentSubtype = "personal"
+	InvestmentSubtypeOther    InvestmentSubtype = "other"
+)
+
+func IsValidInvestmentSubtype(s string) bool {
+	switch InvestmentSubtype(s) {
+	case InvestmentSubtypeTFSA, InvestmentSubtypeRRSP, InvestmentSubtypeFHSA,
+		InvestmentSubtypePersonal, InvestmentSubtypeOther:
+		return true
+	}
+	return false
+}
+
 type TransactionType string

 const (
--- a/internal/model/investment.go
+++ b/internal/model/investment.go
@ -0,0 +1,83 @@
+package model
+
+import (
+	"time"
+
+	"github.com/shopspring/decimal"
+)
+
+type InvestmentContributionRoom struct {
+	AccountID  string          `db:"account_id"`
+	Year       int             `db:"year"`
+	RoomAmount decimal.Decimal `db:"room_amount"`
+	CreatedAt  time.Time       `db:"created_at"`
+	UpdatedAt  time.Time       `db:"updated_at"`
+}
+
+type InvestmentHolding struct {
+	ID          string    `db:"id"`
+	AccountID   string    `db:"account_id"`
+	Symbol      string    `db:"symbol"`
+	DisplayName string    `db:"display_name"`
+	CreatedAt   time.Time `db:"created_at"`
+	UpdatedAt   time.Time `db:"updated_at"`
+}
+
+type InvestmentTradeType string
+
+const (
+	InvestmentTradeTypeBuy  InvestmentTradeType = "buy"
+	InvestmentTradeTypeSell InvestmentTradeType = "sell"
+)
+
+func IsValidInvestmentTradeType(t string) bool {
+	switch InvestmentTradeType(t) {
+	case InvestmentTradeTypeBuy, InvestmentTradeTypeSell:
+		return true
+	}
+	return false
+}
+
+type InvestmentTrade struct {
+	ID           string              `db:"id"`
+	HoldingID    string              `db:"holding_id"`
+	Type         InvestmentTradeType `db:"type"`
+	Quantity     decimal.Decimal     `db:"quantity"`
+	PricePerUnit decimal.Decimal     `db:"price_per_unit"`
+	Fees         *decimal.Decimal    `db:"fees"`
+	OccurredAt   time.Time           `db:"occurred_at"`
+	Notes        *string             `db:"notes"`
+	CreatedAt    time.Time           `db:"created_at"`
+}
+
+// HoldingPosition aggregates a holding with its derived figures across all
+// trades. Quantity is the net of buys minus sells. AvgCost is the weighted
+// average per-unit cost of remaining shares (reduced proportionally on sells).
+// RealizedPL is the cumulative realized profit/loss from sells.
+type HoldingPosition struct {
+	Holding        InvestmentHolding
+	Quantity       decimal.Decimal
+	AvgCost        decimal.Decimal
+	CostBasis      decimal.Decimal
+	LastBuyPrice   *decimal.Decimal
+	LastSellPrice  *decimal.Decimal
+	RealizedPL     decimal.Decimal
+	TotalBuyQty    decimal.Decimal
+	TotalSellQty   decimal.Decimal
+	TotalFees      decimal.Decimal
+}
+
+// InvestmentAccountSummary is the rolled-up view for an investment-flagged
+// account: contribution room and YTD cash flow plus aggregate cost basis across
+// holdings.
+type InvestmentAccountSummary struct {
+	Account            *Account
+	Year               int
+	RoomAmount         *decimal.Decimal // nil if room not yet set for the year
+	YTDContributions   decimal.Decimal
+	YTDWithdrawals     decimal.Decimal
+	RoomRemaining      *decimal.Decimal // nil if RoomAmount is nil
+	NetContributions   decimal.Decimal  // lifetime: all deposits minus all withdrawals
+	TotalCostBasis     decimal.Decimal
+	HoldingCount       int
+}
--- a/internal/model/space_audit_log.go
+++ b/internal/model/space_audit_log.go
@ -15,6 +15,7 @@ const (
 	SpaceAuditActionAccountRenamed         SpaceAuditAction = "account.renamed"
 	SpaceAuditActionAccountDeleted         SpaceAuditAction = "account.deleted"
 	SpaceAuditActionAccountCurrencyChanged SpaceAuditAction = "account.currency_changed"
+	SpaceAuditActionAccountInvestmentFlag  SpaceAuditAction = "account.investment_flag_changed"
 	SpaceAuditActionAllocationCreated      SpaceAuditAction = "allocation.created"
 	SpaceAuditActionAllocationUpdated      SpaceAuditAction = "allocation.updated"
 	SpaceAuditActionAllocationDeleted      SpaceAuditAction = "allocation.deleted"
--- a/internal/repository/account.go
+++ b/internal/repository/account.go
@ -29,6 +29,12 @@ type AccountRepository interface {
 	// ChangeCurrency atomically updates an account's currency and balance and
 	// rewrites each provided allocation's amount/target in the new currency.
 	ChangeCurrency(accountID, newCurrency string, newBalance decimal.Decimal, allocationConversions []AllocationConversion) error
+	// SetInvestment toggles the investment flag and subtype for an account.
+	// subtype is the canonical lowercase string (e.g. "tfsa"); pass nil to clear.
+	SetInvestment(id string, isInvestment bool, subtype *string) error
+	// InvestmentAccountsByUserID returns all investment-flagged accounts the
+	// user owns, across every space the user owns.
+	InvestmentAccountsByUserID(userID string) ([]*model.Account, error)
 }

 type accountRepository struct {
@ -40,9 +46,10 @@ func NewAccountRepository(db *sqlx.DB) AccountRepository {
 }

 func (r *accountRepository) Create(account *model.Account) error {
-	query := `INSERT INTO accounts (id, name, space_id, currency, created_at, updated_at)
-	          VALUES ($1, $2, $3, $4, $5, $6);`
-	_, err := r.db.Exec(query, account.ID, account.Name, account.SpaceID, account.Currency, account.CreatedAt, account.UpdatedAt)
+	query := `INSERT INTO accounts (id, name, space_id, currency, is_investment, investment_subtype, created_at, updated_at)
+	          VALUES ($1, $2, $3, $4, $5, $6, $7, $8);`
+	_, err := r.db.Exec(query, account.ID, account.Name, account.SpaceID, account.Currency,
+		account.IsInvestment, account.InvestmentSubtype, account.CreatedAt, account.UpdatedAt)
 	return err
 }

@ -78,6 +85,36 @@ func (r *accountRepository) Delete(id string) error {
 	return err
 }

+func (r *accountRepository) SetInvestment(id string, isInvestment bool, subtype *string) error {
+	query := `UPDATE accounts
+	          SET is_investment = $1, investment_subtype = $2, updated_at = CURRENT_TIMESTAMP
+	          WHERE id = $3;`
+	res, err := r.db.Exec(query, isInvestment, subtype, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrAccountNotFound
+	}
+	return nil
+}
+
+func (r *accountRepository) InvestmentAccountsByUserID(userID string) ([]*model.Account, error) {
+	var accounts []*model.Account
+	query := `SELECT a.* FROM accounts a
+	          JOIN space_members sm ON sm.space_id = a.space_id
+	          WHERE sm.user_id = $1 AND a.is_investment = TRUE
+	          ORDER BY a.created_at ASC;`
+	if err := r.db.Select(&accounts, query, userID); err != nil {
+		return nil, err
+	}
+	return accounts, nil
+}
+
 func (r *accountRepository) ChangeCurrency(accountID, newCurrency string, newBalance decimal.Decimal, allocationConversions []AllocationConversion) error {
 	return WithTx(r.db, func(tx *sqlx.Tx) error {
 		now := time.Now()
--- a/internal/repository/investment_contribution_room.go
+++ b/internal/repository/investment_contribution_room.go
@ -0,0 +1,74 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+)
+
+var ErrContributionRoomNotFound = errors.New("contribution room not found")
+
+type InvestmentContributionRoomRepository interface {
+	Upsert(room *model.InvestmentContributionRoom) error
+	ByAccountAndYear(accountID string, year int) (*model.InvestmentContributionRoom, error)
+	ByAccountID(accountID string) ([]*model.InvestmentContributionRoom, error)
+	Delete(accountID string, year int) error
+}
+
+type investmentContributionRoomRepository struct {
+	db *sqlx.DB
+}
+
+func NewInvestmentContributionRoomRepository(db *sqlx.DB) InvestmentContributionRoomRepository {
+	return &investmentContributionRoomRepository{db: db}
+}
+
+func (r *investmentContributionRoomRepository) Upsert(room *model.InvestmentContributionRoom) error {
+	query := `INSERT INTO investment_contribution_rooms (account_id, year, room_amount, created_at, updated_at)
+	          VALUES ($1, $2, $3, $4, $5)
+	          ON CONFLICT (account_id, year) DO UPDATE
+	          SET room_amount = EXCLUDED.room_amount,
+	              updated_at = EXCLUDED.updated_at;`
+	_, err := r.db.Exec(query, room.AccountID, room.Year, room.RoomAmount, room.CreatedAt, room.UpdatedAt)
+	return err
+}
+
+func (r *investmentContributionRoomRepository) ByAccountAndYear(accountID string, year int) (*model.InvestmentContributionRoom, error) {
+	room := &model.InvestmentContributionRoom{}
+	query := `SELECT * FROM investment_contribution_rooms WHERE account_id = $1 AND year = $2;`
+	err := r.db.Get(room, query, accountID, year)
+	if err == sql.ErrNoRows {
+		return nil, ErrContributionRoomNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return room, nil
+}
+
+func (r *investmentContributionRoomRepository) ByAccountID(accountID string) ([]*model.InvestmentContributionRoom, error) {
+	var rooms []*model.InvestmentContributionRoom
+	query := `SELECT * FROM investment_contribution_rooms WHERE account_id = $1 ORDER BY year DESC;`
+	if err := r.db.Select(&rooms, query, accountID); err != nil {
+		return nil, err
+	}
+	return rooms, nil
+}
+
+func (r *investmentContributionRoomRepository) Delete(accountID string, year int) error {
+	res, err := r.db.Exec(`DELETE FROM investment_contribution_rooms WHERE account_id = $1 AND year = $2;`, accountID, year)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrContributionRoomNotFound
+	}
+	return nil
+}
+
--- a/internal/repository/investment_holding.go
+++ b/internal/repository/investment_holding.go
@ -0,0 +1,89 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+)
+
+var ErrHoldingNotFound = errors.New("investment holding not found")
+
+type InvestmentHoldingRepository interface {
+	Create(h *model.InvestmentHolding) error
+	ByID(id string) (*model.InvestmentHolding, error)
+	ByAccountID(accountID string) ([]*model.InvestmentHolding, error)
+	Update(id, symbol, displayName string) error
+	Delete(id string) error
+}
+
+type investmentHoldingRepository struct {
+	db *sqlx.DB
+}
+
+func NewInvestmentHoldingRepository(db *sqlx.DB) InvestmentHoldingRepository {
+	return &investmentHoldingRepository{db: db}
+}
+
+func (r *investmentHoldingRepository) Create(h *model.InvestmentHolding) error {
+	query := `INSERT INTO investment_holdings (id, account_id, symbol, display_name, created_at, updated_at)
+	          VALUES ($1, $2, $3, $4, $5, $6);`
+	_, err := r.db.Exec(query, h.ID, h.AccountID, h.Symbol, h.DisplayName, h.CreatedAt, h.UpdatedAt)
+	return err
+}
+
+func (r *investmentHoldingRepository) ByID(id string) (*model.InvestmentHolding, error) {
+	h := &model.InvestmentHolding{}
+	query := `SELECT * FROM investment_holdings WHERE id = $1;`
+	err := r.db.Get(h, query, id)
+	if err == sql.ErrNoRows {
+		return nil, ErrHoldingNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return h, nil
+}
+
+func (r *investmentHoldingRepository) ByAccountID(accountID string) ([]*model.InvestmentHolding, error) {
+	var holdings []*model.InvestmentHolding
+	query := `SELECT * FROM investment_holdings WHERE account_id = $1 ORDER BY symbol ASC;`
+	if err := r.db.Select(&holdings, query, accountID); err != nil {
+		return nil, err
+	}
+	return holdings, nil
+}
+
+func (r *investmentHoldingRepository) Update(id, symbol, displayName string) error {
+	query := `UPDATE investment_holdings
+	          SET symbol = $1, display_name = $2, updated_at = CURRENT_TIMESTAMP
+	          WHERE id = $3;`
+	res, err := r.db.Exec(query, symbol, displayName, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrHoldingNotFound
+	}
+	return nil
+}
+
+func (r *investmentHoldingRepository) Delete(id string) error {
+	res, err := r.db.Exec(`DELETE FROM investment_holdings WHERE id = $1;`, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrHoldingNotFound
+	}
+	return nil
+}
--- a/internal/repository/investment_trade.go
+++ b/internal/repository/investment_trade.go
@ -0,0 +1,91 @@
+package repository
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"github.com/jmoiron/sqlx"
+	"github.com/shopspring/decimal"
+)
+
+var ErrTradeNotFound = errors.New("investment trade not found")
+
+type InvestmentTradeRepository interface {
+	Create(t *model.InvestmentTrade) error
+	ByID(id string) (*model.InvestmentTrade, error)
+	ByHoldingID(holdingID string) ([]*model.InvestmentTrade, error)
+	Update(id string, quantity, pricePerUnit decimal.Decimal, fees *decimal.Decimal, occurredAt time.Time, notes *string) error
+	Delete(id string) error
+}
+
+type investmentTradeRepository struct {
+	db *sqlx.DB
+}
+
+func NewInvestmentTradeRepository(db *sqlx.DB) InvestmentTradeRepository {
+	return &investmentTradeRepository{db: db}
+}
+
+func (r *investmentTradeRepository) Create(t *model.InvestmentTrade) error {
+	query := `INSERT INTO investment_trades (id, holding_id, type, quantity, price_per_unit, fees, occurred_at, notes, created_at)
+	          VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9);`
+	_, err := r.db.Exec(query, t.ID, t.HoldingID, t.Type, t.Quantity, t.PricePerUnit, t.Fees, t.OccurredAt, t.Notes, t.CreatedAt)
+	return err
+}
+
+func (r *investmentTradeRepository) ByID(id string) (*model.InvestmentTrade, error) {
+	t := &model.InvestmentTrade{}
+	query := `SELECT * FROM investment_trades WHERE id = $1;`
+	err := r.db.Get(t, query, id)
+	if err == sql.ErrNoRows {
+		return nil, ErrTradeNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return t, nil
+}
+
+func (r *investmentTradeRepository) ByHoldingID(holdingID string) ([]*model.InvestmentTrade, error) {
+	var trades []*model.InvestmentTrade
+	query := `SELECT * FROM investment_trades WHERE holding_id = $1 ORDER BY occurred_at ASC, created_at ASC;`
+	if err := r.db.Select(&trades, query, holdingID); err != nil {
+		return nil, err
+	}
+	return trades, nil
+}
+
+func (r *investmentTradeRepository) Update(id string, quantity, pricePerUnit decimal.Decimal, fees *decimal.Decimal, occurredAt time.Time, notes *string) error {
+	query := `UPDATE investment_trades
+	          SET quantity = $1, price_per_unit = $2, fees = $3, occurred_at = $4, notes = $5
+	          WHERE id = $6;`
+	res, err := r.db.Exec(query, quantity, pricePerUnit, fees, occurredAt, notes, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrTradeNotFound
+	}
+	return nil
+}
+
+func (r *investmentTradeRepository) Delete(id string) error {
+	res, err := r.db.Exec(`DELETE FROM investment_trades WHERE id = $1;`, id)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return ErrTradeNotFound
+	}
+	return nil
+}
--- a/internal/repository/transaction.go
+++ b/internal/repository/transaction.go
@ -22,6 +22,12 @@ type TransactionRepository interface {
 	TransferIDsIn(ids []string) (map[string]bool, error)
 	ListByAccount(accountID string, limit, offset int) ([]*model.Transaction, error)
 	CountByAccount(accountID string) (int, error)
+	// SumByAccountYearType totals transaction values for an account, year,
+	// and type (deposit or withdrawal). Returns zero when no rows match.
+	SumByAccountYearType(accountID string, year int, txType model.TransactionType) (decimal.Decimal, error)
+	// SumLifetimeByAccountType totals transaction values for an account over
+	// its full history, restricted to one type.
+	SumLifetimeByAccountType(accountID string, txType model.TransactionType) (decimal.Decimal, error)
 }

 type transactionRepository struct {
@ -304,3 +310,25 @@ func (r *transactionRepository) CountByAccount(accountID string) (int, error) {
 	}
 	return count, nil
 }
+
+func (r *transactionRepository) SumByAccountYearType(accountID string, year int, txType model.TransactionType) (decimal.Decimal, error) {
+	var sum decimal.Decimal
+	query := `SELECT COALESCE(SUM(value::numeric), 0)::text FROM transactions
+	          WHERE account_id = $1
+	            AND type = $2
+	            AND EXTRACT(YEAR FROM occurred_at) = $3;`
+	if err := r.db.Get(&sum, query, accountID, txType, year); err != nil {
+		return decimal.Zero, err
+	}
+	return sum, nil
+}
+
+func (r *transactionRepository) SumLifetimeByAccountType(accountID string, txType model.TransactionType) (decimal.Decimal, error) {
+	var sum decimal.Decimal
+	query := `SELECT COALESCE(SUM(value::numeric), 0)::text FROM transactions
+	          WHERE account_id = $1 AND type = $2;`
+	if err := r.db.Get(&sum, query, accountID, txType); err != nil {
+		return decimal.Zero, err
+	}
+	return sum, nil
+}
--- a/internal/routes/routes.go
+++ b/internal/routes/routes.go
@ -19,9 +19,10 @@ func SetupRoutes(a *app.App) http.Handler {
 	authH := handler.NewAuthHandler(a.AuthService, a.InviteService, a.SpaceService)
 	homeH := handler.NewHomeHandler()
 	settingsH := handler.NewSettingsHandler(a.AuthService, a.UserService)
-	spaceH := handler.NewSpaceHandler(a.SpaceService, a.AccountService, a.TransactionService, a.AllocationService, a.InviteService, a.AuditLogService, a.TxAuditLogService, a.AccountActivitySvc)
+	spaceH := handler.NewSpaceHandler(a.SpaceService, a.AccountService, a.TransactionService, a.AllocationService, a.InviteService, a.AuditLogService, a.TxAuditLogService, a.AccountActivitySvc, a.InvestmentService)
 	allocationH := handler.NewAllocationHandler(a.AllocationService, a.AccountService)
 	recurringH := handler.NewRecurringEventHandler(a.RecurringEventService, a.AccountService, a.SpaceService)
+	investmentH := handler.NewInvestmentHandler(a.AccountService, a.SpaceService, a.InvestmentService)
 	redirectH := handler.NewRedirectHandler()

 	r := router.New()
@ -95,6 +96,8 @@ func SetupRoutes(a *app.App) http.Handler {

 		g.Get("/home", spaceH.HomePage).Name("page.app.home")

+		g.Get("/investments", investmentH.InvestmentsOverviewPage).Name("page.app.investments")
+
 		g.SubGroup("/spaces", func(g *router.Group) {
 			g.Get("", spaceH.SpacesPage).Name("page.app.spaces")
 			g.Get("/create", spaceH.CreateSpacePage).Name("page.app.spaces.create")
@ -136,6 +139,7 @@ func SetupRoutes(a *app.App) http.Handler {
 					g.Post("/settings/rename", spaceH.HandleRenameAccount).Name("action.app.spaces.space.accounts.account.settings.rename")
 					g.Post("/settings/currency", spaceH.HandleChangeAccountCurrency).Name("action.app.spaces.space.accounts.account.settings.currency")
 					g.Post("/settings/delete", spaceH.HandleDeleteAccount).Name("action.app.spaces.space.accounts.account.settings.delete")
+					g.Post("/settings/investment", spaceH.HandleSetInvestmentFlag).Name("action.app.spaces.space.accounts.account.settings.investment")
 					g.Get("/bills/create", spaceH.SpaceCreateBillPage).Name("page.app.spaces.space.accounts.account.bills.create")
 					g.Post("/bills/create", spaceH.HandleCreateBill).Name("action.app.spaces.space.accounts.account.bills.create")
 					g.Get("/deposits/create", spaceH.SpaceCreateDepositPage).Name("page.app.spaces.space.accounts.account.deposits.create")
@ -146,6 +150,14 @@ func SetupRoutes(a *app.App) http.Handler {
 					g.Post("/allocations/create", allocationH.HandleCreate).Name("action.app.spaces.space.accounts.account.allocations.create")
 					g.Post("/allocations/{allocationID}/edit", allocationH.HandleEdit).Name("action.app.spaces.space.accounts.account.allocations.allocation.edit")
 					g.Post("/allocations/{allocationID}/delete", allocationH.HandleDelete).Name("action.app.spaces.space.accounts.account.allocations.allocation.delete")
+
+					g.Post("/investments/contribution-room", investmentH.HandleSetContributionRoom).Name("action.app.spaces.space.accounts.account.investments.contribution-room")
+					g.Get("/investments/holdings/create", investmentH.CreateHoldingPage).Name("page.app.spaces.space.accounts.account.investments.holdings.create")
+					g.Post("/investments/holdings/create", investmentH.HandleCreateHolding).Name("action.app.spaces.space.accounts.account.investments.holdings.create")
+					g.Get("/investments/holdings/{holdingID}", investmentH.HoldingDetailPage).Name("page.app.spaces.space.accounts.account.investments.holdings.holding")
+					g.Post("/investments/holdings/{holdingID}/delete", investmentH.HandleDeleteHolding).Name("action.app.spaces.space.accounts.account.investments.holdings.holding.delete")
+					g.Post("/investments/holdings/{holdingID}/trades/create", investmentH.HandleCreateTrade).Name("action.app.spaces.space.accounts.account.investments.holdings.holding.trades.create")
+					g.Post("/investments/holdings/{holdingID}/trades/{tradeID}/delete", investmentH.HandleDeleteTrade).Name("action.app.spaces.space.accounts.account.investments.holdings.holding.trades.trade.delete")
 				})
 			})
 		})
--- a/internal/service/account.go
+++ b/internal/service/account.go
@ -34,47 +34,126 @@ func (s *AccountService) SetAuditLogger(audit *SpaceAuditLogService) {
 	s.auditSvc = audit
 }

-func (s *AccountService) CreateAccount(spaceID, name, currencyCode, actorID string) (*model.Account, error) {
-	if spaceID == "" {
+// CreateAccountInput captures all the fields the caller can set when creating
+// an account. isInvestment + investmentSubtype are optional; if isInvestment is
+// false the subtype is forced to nil.
+type CreateAccountInput struct {
+	SpaceID           string
+	Name              string
+	CurrencyCode      string
+	IsInvestment      bool
+	InvestmentSubtype string // canonical lowercase string; ignored if IsInvestment is false
+	ActorID           string
+}
+
+func (s *AccountService) CreateAccount(input CreateAccountInput) (*model.Account, error) {
+	if input.SpaceID == "" {
 		return nil, fmt.Errorf("space id is required")
 	}
-	if name == "" {
+	if input.Name == "" {
 		return nil, fmt.Errorf("account name cannot be empty")
 	}

-	code := currency.Normalize(currencyCode)
+	code := currency.Normalize(input.CurrencyCode)
 	if code == "" {
 		code = currency.Default
 	}
 	if !currency.IsValid(code) {
-		return nil, fmt.Errorf("unsupported currency code: %s", currencyCode)
+		return nil, fmt.Errorf("unsupported currency code: %s", input.CurrencyCode)
+	}
+
+	var subtypePtr *string
+	if input.IsInvestment {
+		sub := input.InvestmentSubtype
+		if !model.IsValidInvestmentSubtype(sub) {
+			return nil, fmt.Errorf("invalid investment subtype: %s", sub)
+		}
+		subtypePtr = &sub
 	}

 	now := time.Now()
 	account := &model.Account{
 		ID:                uuid.NewString(),
-		Name:      name,
-		SpaceID:   spaceID,
+		Name:              input.Name,
+		SpaceID:           input.SpaceID,
 		Currency:          code,
+		IsInvestment:      input.IsInvestment,
+		InvestmentSubtype: subtypePtr,
 		CreatedAt:         now,
 		UpdatedAt:         now,
 	}
 	if err := s.accountRepo.Create(account); err != nil {
 		return nil, fmt.Errorf("failed to create account: %w", err)
 	}
-	s.auditSvc.Record(RecordOptions{
-		SpaceID: spaceID,
-		ActorID: actorID,
-		Action:  model.SpaceAuditActionAccountCreated,
-		Metadata: map[string]any{
+	meta := map[string]any{
 		"account_id":   account.ID,
 		"account_name": account.Name,
 		"currency":     account.Currency,
-		},
+	}
+	if account.IsInvestment {
+		meta["is_investment"] = true
+		if subtypePtr != nil {
+			meta["investment_subtype"] = *subtypePtr
+		}
+	}
+	s.auditSvc.Record(RecordOptions{
+		SpaceID:  input.SpaceID,
+		ActorID:  input.ActorID,
+		Action:   model.SpaceAuditActionAccountCreated,
+		Metadata: meta,
 	})
 	return account, nil
 }

+// SetInvestmentFlag toggles the investment flag on an existing account. When
+// turning the flag off, the subtype is cleared.
+func (s *AccountService) SetInvestmentFlag(accountID string, isInvestment bool, subtype string, actorID string) error {
+	if accountID == "" {
+		return fmt.Errorf("account id is required")
+	}
+	account, err := s.accountRepo.ByID(accountID)
+	if err != nil {
+		return fmt.Errorf("failed to load account: %w", err)
+	}
+
+	var subtypePtr *string
+	if isInvestment {
+		if !model.IsValidInvestmentSubtype(subtype) {
+			return fmt.Errorf("invalid investment subtype: %s", subtype)
+		}
+		s := subtype
+		subtypePtr = &s
+	}
+	if err := s.accountRepo.SetInvestment(accountID, isInvestment, subtypePtr); err != nil {
+		return fmt.Errorf("failed to update investment flag: %w", err)
+	}
+	s.auditSvc.Record(RecordOptions{
+		SpaceID: account.SpaceID,
+		ActorID: actorID,
+		Action:  model.SpaceAuditActionAccountInvestmentFlag,
+		Metadata: map[string]any{
+			"account_id":         accountID,
+			"account_name":       account.Name,
+			"is_investment":      isInvestment,
+			"investment_subtype": subtypePtr,
+		},
+	})
+	return nil
+}
+
+// InvestmentAccountsForUser lists every investment-flagged account in spaces
+// the user is a member of (including spaces they own).
+func (s *AccountService) InvestmentAccountsForUser(userID string) ([]*model.Account, error) {
+	if userID == "" {
+		return nil, fmt.Errorf("user id is required")
+	}
+	accounts, err := s.accountRepo.InvestmentAccountsByUserID(userID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list investment accounts: %w", err)
+	}
+	return accounts, nil
+}
+
 func (s *AccountService) GetAccount(id string) (*model.Account, error) {
 	account, err := s.accountRepo.ByID(id)
 	if err != nil {
--- a/internal/service/account_test.go
+++ b/internal/service/account_test.go
@ -22,7 +22,7 @@ func TestAccountService_CreateAccount_RecordsAudit(t *testing.T) {
 		user := testutil.CreateTestUser(t, dbi.DB, "acct-create-audit@example.com", nil)
 		space := testutil.CreateTestSpace(t, dbi.DB, user.ID, "S")

-		account, err := svc.CreateAccount(space.ID, "Checking", "CAD", user.ID)
+		account, err := svc.CreateAccount(CreateAccountInput{SpaceID: space.ID, Name: "Checking", CurrencyCode: "CAD", ActorID: user.ID})
 		require.NoError(t, err)

 		logs, err := auditRepo.ListAccountEvents(account.ID, 10, 0)
@ -104,7 +104,7 @@ func TestAccountService_NoAuditLoggerSet_DoesNotPanic(t *testing.T) {
 		user := testutil.CreateTestUser(t, dbi.DB, "no-audit@example.com", nil)
 		space := testutil.CreateTestSpace(t, dbi.DB, user.ID, "S")

-		account, err := svc.CreateAccount(space.ID, "x", "", user.ID)
+		account, err := svc.CreateAccount(CreateAccountInput{SpaceID: space.ID, Name: "x", ActorID: user.ID})
 		require.NoError(t, err)
 		require.NoError(t, svc.RenameAccount(account.ID, "y", user.ID))
 		require.NoError(t, svc.DeleteAccount(account.ID, user.ID))
--- a/internal/service/auth.go
+++ b/internal/service/auth.go
@ -371,7 +371,11 @@ func (s *AuthService) CompleteOnboarding(userID, name string) error {
 			return fmt.Errorf("failed to create onboarding space: %w", err)
 		}

-		if _, err := s.accountService.CreateAccount(space.ID, DefaultAccountName, "", userID); err != nil {
+		if _, err := s.accountService.CreateAccount(CreateAccountInput{
+			SpaceID: space.ID,
+			Name:    DefaultAccountName,
+			ActorID: userID,
+		}); err != nil {
 			if delErr := s.spaceService.DeleteSpace(space.ID, userID); delErr != nil {
 				slog.Error("failed to roll back space after account creation error",
 					"space_id", space.ID, "error", delErr)
--- a/internal/service/investment.go
+++ b/internal/service/investment.go
@ -0,0 +1,355 @@
+package service
+
+import (
+	"fmt"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/repository"
+	"github.com/google/uuid"
+	"github.com/shopspring/decimal"
+)
+
+// InvestmentService handles contribution rooms, holdings, trades, and the
+// summary view for investment-flagged accounts. Cash movement (contributions
+// and withdrawals) still goes through TransactionService / TransferService;
+// this service reads from those tables but never mutates them directly.
+type InvestmentService struct {
+	accountRepo repository.AccountRepository
+	roomRepo    repository.InvestmentContributionRoomRepository
+	holdingRepo repository.InvestmentHoldingRepository
+	tradeRepo   repository.InvestmentTradeRepository
+	txRepo      repository.TransactionRepository
+}
+
+func NewInvestmentService(
+	accountRepo repository.AccountRepository,
+	roomRepo repository.InvestmentContributionRoomRepository,
+	holdingRepo repository.InvestmentHoldingRepository,
+	tradeRepo repository.InvestmentTradeRepository,
+	txRepo repository.TransactionRepository,
+) *InvestmentService {
+	return &InvestmentService{
+		accountRepo: accountRepo,
+		roomRepo:    roomRepo,
+		holdingRepo: holdingRepo,
+		tradeRepo:   tradeRepo,
+		txRepo:      txRepo,
+	}
+}
+
+// ---------- Contribution room ----------
+
+func (s *InvestmentService) SetContributionRoom(accountID string, year int, room decimal.Decimal) error {
+	if accountID == "" {
+		return fmt.Errorf("account id is required")
+	}
+	if year < 1900 || year > 9999 {
+		return fmt.Errorf("year out of range")
+	}
+	if room.IsNegative() {
+		return fmt.Errorf("contribution room cannot be negative")
+	}
+	account, err := s.accountRepo.ByID(accountID)
+	if err != nil {
+		return fmt.Errorf("failed to load account: %w", err)
+	}
+	if !account.IsInvestment {
+		return fmt.Errorf("account is not an investment account")
+	}
+	now := time.Now()
+	return s.roomRepo.Upsert(&model.InvestmentContributionRoom{
+		AccountID:  accountID,
+		Year:       year,
+		RoomAmount: room,
+		CreatedAt:  now,
+		UpdatedAt:  now,
+	})
+}
+
+func (s *InvestmentService) GetContributionRoom(accountID string, year int) (*model.InvestmentContributionRoom, error) {
+	room, err := s.roomRepo.ByAccountAndYear(accountID, year)
+	if err != nil {
+		if err == repository.ErrContributionRoomNotFound {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("failed to load contribution room: %w", err)
+	}
+	return room, nil
+}
+
+func (s *InvestmentService) ListContributionRooms(accountID string) ([]*model.InvestmentContributionRoom, error) {
+	rooms, err := s.roomRepo.ByAccountID(accountID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list contribution rooms: %w", err)
+	}
+	return rooms, nil
+}
+
+// ---------- Summary ----------
+
+// SummarizeAccount produces the rollup view for an investment account in the
+// given calendar year: contribution room, YTD cash flow, lifetime net
+// contributions, and total cost basis across all holdings.
+func (s *InvestmentService) SummarizeAccount(accountID string, year int) (*model.InvestmentAccountSummary, error) {
+	account, err := s.accountRepo.ByID(accountID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load account: %w", err)
+	}
+	if !account.IsInvestment {
+		return nil, fmt.Errorf("account is not an investment account")
+	}
+
+	ytdContrib, err := s.txRepo.SumByAccountYearType(accountID, year, model.TransactionTypeDeposit)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sum ytd contributions: %w", err)
+	}
+	ytdWithdraw, err := s.txRepo.SumByAccountYearType(accountID, year, model.TransactionTypeWithdrawal)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sum ytd withdrawals: %w", err)
+	}
+	lifeContrib, err := s.txRepo.SumLifetimeByAccountType(accountID, model.TransactionTypeDeposit)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sum lifetime contributions: %w", err)
+	}
+	lifeWithdraw, err := s.txRepo.SumLifetimeByAccountType(accountID, model.TransactionTypeWithdrawal)
+	if err != nil {
+		return nil, fmt.Errorf("failed to sum lifetime withdrawals: %w", err)
+	}
+
+	summary := &model.InvestmentAccountSummary{
+		Account:          account,
+		Year:             year,
+		YTDContributions: ytdContrib,
+		YTDWithdrawals:   ytdWithdraw,
+		NetContributions: lifeContrib.Sub(lifeWithdraw),
+	}
+
+	room, err := s.roomRepo.ByAccountAndYear(accountID, year)
+	if err == nil {
+		amt := room.RoomAmount
+		summary.RoomAmount = &amt
+		rem := amt.Sub(ytdContrib)
+		summary.RoomRemaining = &rem
+	} else if err != repository.ErrContributionRoomNotFound {
+		return nil, fmt.Errorf("failed to load contribution room: %w", err)
+	}
+
+	positions, err := s.HoldingPositions(accountID)
+	if err != nil {
+		return nil, err
+	}
+	summary.HoldingCount = len(positions)
+	for _, p := range positions {
+		summary.TotalCostBasis = summary.TotalCostBasis.Add(p.CostBasis)
+	}
+	return summary, nil
+}
+
+// ---------- Holdings ----------
+
+func (s *InvestmentService) CreateHolding(accountID, symbol, displayName string) (*model.InvestmentHolding, error) {
+	if accountID == "" {
+		return nil, fmt.Errorf("account id is required")
+	}
+	if symbol == "" {
+		return nil, fmt.Errorf("symbol is required")
+	}
+	if displayName == "" {
+		displayName = symbol
+	}
+	account, err := s.accountRepo.ByID(accountID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load account: %w", err)
+	}
+	if !account.IsInvestment {
+		return nil, fmt.Errorf("account is not an investment account")
+	}
+	now := time.Now()
+	holding := &model.InvestmentHolding{
+		ID:          uuid.NewString(),
+		AccountID:   accountID,
+		Symbol:      symbol,
+		DisplayName: displayName,
+		CreatedAt:   now,
+		UpdatedAt:   now,
+	}
+	if err := s.holdingRepo.Create(holding); err != nil {
+		return nil, fmt.Errorf("failed to create holding: %w", err)
+	}
+	return holding, nil
+}
+
+func (s *InvestmentService) GetHolding(id string) (*model.InvestmentHolding, error) {
+	h, err := s.holdingRepo.ByID(id)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load holding: %w", err)
+	}
+	return h, nil
+}
+
+func (s *InvestmentService) UpdateHolding(id, symbol, displayName string) error {
+	if symbol == "" {
+		return fmt.Errorf("symbol is required")
+	}
+	if displayName == "" {
+		displayName = symbol
+	}
+	if err := s.holdingRepo.Update(id, symbol, displayName); err != nil {
+		return fmt.Errorf("failed to update holding: %w", err)
+	}
+	return nil
+}
+
+func (s *InvestmentService) DeleteHolding(id string) error {
+	return s.holdingRepo.Delete(id)
+}
+
+func (s *InvestmentService) ListHoldings(accountID string) ([]*model.InvestmentHolding, error) {
+	return s.holdingRepo.ByAccountID(accountID)
+}
+
+// ---------- Trades ----------
+
+type RecordTradeInput struct {
+	HoldingID    string
+	Type         model.InvestmentTradeType
+	Quantity     decimal.Decimal
+	PricePerUnit decimal.Decimal
+	Fees         *decimal.Decimal
+	OccurredAt   time.Time
+	Notes        *string
+}
+
+func (s *InvestmentService) RecordTrade(input RecordTradeInput) (*model.InvestmentTrade, error) {
+	if input.HoldingID == "" {
+		return nil, fmt.Errorf("holding id is required")
+	}
+	if !model.IsValidInvestmentTradeType(string(input.Type)) {
+		return nil, fmt.Errorf("invalid trade type: %s", input.Type)
+	}
+	if !input.Quantity.IsPositive() {
+		return nil, fmt.Errorf("quantity must be greater than zero")
+	}
+	if input.PricePerUnit.IsNegative() {
+		return nil, fmt.Errorf("price per unit cannot be negative")
+	}
+	if input.OccurredAt.IsZero() {
+		input.OccurredAt = time.Now()
+	}
+	trade := &model.InvestmentTrade{
+		ID:           uuid.NewString(),
+		HoldingID:    input.HoldingID,
+		Type:         input.Type,
+		Quantity:     input.Quantity,
+		PricePerUnit: input.PricePerUnit,
+		Fees:         input.Fees,
+		OccurredAt:   input.OccurredAt,
+		Notes:        input.Notes,
+		CreatedAt:    time.Now(),
+	}
+	if err := s.tradeRepo.Create(trade); err != nil {
+		return nil, fmt.Errorf("failed to record trade: %w", err)
+	}
+	return trade, nil
+}
+
+func (s *InvestmentService) UpdateTrade(id string, qty, price decimal.Decimal, fees *decimal.Decimal, occurredAt time.Time, notes *string) error {
+	if !qty.IsPositive() {
+		return fmt.Errorf("quantity must be greater than zero")
+	}
+	if price.IsNegative() {
+		return fmt.Errorf("price per unit cannot be negative")
+	}
+	return s.tradeRepo.Update(id, qty, price, fees, occurredAt, notes)
+}
+
+func (s *InvestmentService) DeleteTrade(id string) error {
+	return s.tradeRepo.Delete(id)
+}
+
+func (s *InvestmentService) GetTrade(id string) (*model.InvestmentTrade, error) {
+	return s.tradeRepo.ByID(id)
+}
+
+func (s *InvestmentService) ListTrades(holdingID string) ([]*model.InvestmentTrade, error) {
+	return s.tradeRepo.ByHoldingID(holdingID)
+}
+
+// HoldingPositions returns the derived position for every holding in the
+// account. Positions are computed by replaying each trade in chronological
+// order, maintaining a running weighted-average cost basis. Each sell reduces
+// the remaining quantity at the current avg cost; realized P/L accumulates on
+// each sell as (sell.price − avg cost) × qty − fees.
+func (s *InvestmentService) HoldingPositions(accountID string) ([]model.HoldingPosition, error) {
+	holdings, err := s.holdingRepo.ByAccountID(accountID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load holdings: %w", err)
+	}
+	out := make([]model.HoldingPosition, 0, len(holdings))
+	for _, h := range holdings {
+		pos, err := s.holdingPosition(*h)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, pos)
+	}
+	return out, nil
+}
+
+func (s *InvestmentService) HoldingPosition(holdingID string) (*model.HoldingPosition, error) {
+	h, err := s.holdingRepo.ByID(holdingID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load holding: %w", err)
+	}
+	pos, err := s.holdingPosition(*h)
+	if err != nil {
+		return nil, err
+	}
+	return &pos, nil
+}
+
+func (s *InvestmentService) holdingPosition(h model.InvestmentHolding) (model.HoldingPosition, error) {
+	trades, err := s.tradeRepo.ByHoldingID(h.ID)
+	if err != nil {
+		return model.HoldingPosition{}, fmt.Errorf("failed to load trades: %w", err)
+	}
+	pos := model.HoldingPosition{Holding: h}
+	qty := decimal.Zero
+	avgCost := decimal.Zero
+	for _, t := range trades {
+		fees := decimal.Zero
+		if t.Fees != nil {
+			fees = *t.Fees
+		}
+		pos.TotalFees = pos.TotalFees.Add(fees)
+		switch t.Type {
+		case model.InvestmentTradeTypeBuy:
+			newQty := qty.Add(t.Quantity)
+			if newQty.IsPositive() {
+				// weighted average including fees in cost basis
+				newCost := qty.Mul(avgCost).Add(t.Quantity.Mul(t.PricePerUnit)).Add(fees)
+				avgCost = newCost.Div(newQty)
+			}
+			qty = newQty
+			pos.TotalBuyQty = pos.TotalBuyQty.Add(t.Quantity)
+			price := t.PricePerUnit
+			pos.LastBuyPrice = &price
+		case model.InvestmentTradeTypeSell:
+			realized := t.PricePerUnit.Sub(avgCost).Mul(t.Quantity).Sub(fees)
+			pos.RealizedPL = pos.RealizedPL.Add(realized)
+			qty = qty.Sub(t.Quantity)
+			pos.TotalSellQty = pos.TotalSellQty.Add(t.Quantity)
+			price := t.PricePerUnit
+			pos.LastSellPrice = &price
+			if !qty.IsPositive() {
+				qty = decimal.Zero
+				avgCost = decimal.Zero
+			}
+		}
+	}
+	pos.Quantity = qty
+	pos.AvgCost = avgCost
+	pos.CostBasis = qty.Mul(avgCost)
+	return pos, nil
+}
--- a/internal/ui/blocks/investment_section.templ
+++ b/internal/ui/blocks/investment_section.templ
@ -0,0 +1,220 @@
+package blocks
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/shopspring/decimal"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/routeurl"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/badge"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/button"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/card"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/icon"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/input"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/utils"
+)
+
+type InvestmentSectionProps struct {
+	SpaceID   string
+	AccountID string
+	Currency  string
+	Summary   *model.InvestmentAccountSummary
+	Positions []model.HoldingPosition
+}
+
+func fmtMoney(d decimal.Decimal) string {
+	s, _ := utils.FormatDecimalWithThousands(d.StringFixedBank(2))
+	return s
+}
+
+func subtypeLabel(s *string) string {
+	if s == nil {
+		return ""
+	}
+	return strings.ToUpper(*s)
+}
+
+func plClass(d decimal.Decimal) string {
+	if d.IsNegative() {
+		return "text-red-600 dark:text-red-400"
+	}
+	if d.IsPositive() {
+		return "text-green-600 dark:text-green-400"
+	}
+	return ""
+}
+
+templ InvestmentSection(props InvestmentSectionProps) {
+	<div id="investment-section" class="space-y-4">
+		@card.Card(card.Props{Class: "rounded-sm"}) {
+			@card.Header() {
+				<div class="flex items-start justify-between gap-3">
+					<div>
+						@card.Title() {
+							<div class="flex items-center gap-2">
+								Contribution Room ({ fmt.Sprintf("%d", props.Summary.Year) })
+								if label := subtypeLabel(props.Summary.Account.InvestmentSubtype); label != "" {
+									@badge.Badge(badge.Props{Variant: badge.VariantSecondary, Class: "text-xs"}) {
+										{ label }
+									}
+								}
+							</div>
+						}
+						@card.Description() {
+							Track yearly contributions against the room you set.
+						}
+					</div>
+				</div>
+			}
+			@card.Content(card.ContentProps{Class: "space-y-4"}) {
+				<div class="grid grid-cols-2 md:grid-cols-4 gap-4 text-sm">
+					<div>
+						<div class="text-muted-foreground">Room</div>
+						<div class="text-lg font-semibold">
+							if props.Summary.RoomAmount != nil {
+								${ fmtMoney(*props.Summary.RoomAmount) }
+							} else {
+								<span class="text-muted-foreground italic">Not set</span>
+							}
+						</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">YTD Contributions</div>
+						<div class="text-lg font-semibold">${ fmtMoney(props.Summary.YTDContributions) }</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">YTD Withdrawals</div>
+						<div class="text-lg font-semibold">${ fmtMoney(props.Summary.YTDWithdrawals) }</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">Remaining</div>
+						<div class={ "text-lg font-semibold", plClass(remainingValue(props.Summary)) }>
+							if props.Summary.RoomRemaining != nil {
+								${ fmtMoney(*props.Summary.RoomRemaining) }
+							} else {
+								<span class="text-muted-foreground">—</span>
+							}
+						</div>
+					</div>
+				</div>
+				<form
+					hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.investments.contribution-room", "spaceID", props.SpaceID, "accountID", props.AccountID) }
+					hx-target="#investment-section"
+					hx-swap="outerHTML"
+					class="flex flex-wrap items-end gap-2"
+				>
+					<div class="flex flex-col gap-1">
+						<label class="text-xs text-muted-foreground" for="room-year">Year</label>
+						@input.Input(input.Props{
+							ID:    "room-year",
+							Name:  "year",
+							Type:  input.TypeNumber,
+							Value: fmt.Sprintf("%d", props.Summary.Year),
+							Class: "w-28 rounded-sm",
+						})
+					</div>
+					<div class="flex flex-col gap-1">
+						<label class="text-xs text-muted-foreground" for="room-amount">Room amount ({ props.Currency })</label>
+						{{
+							currentRoom := ""
+							if props.Summary.RoomAmount != nil {
+								currentRoom = props.Summary.RoomAmount.StringFixedBank(2)
+							}
+						}}
+						@input.Input(input.Props{
+							ID:          "room-amount",
+							Name:        "room",
+							Type:        input.TypeText,
+							Value:       currentRoom,
+							Placeholder: "0.00",
+							Class:       "w-40 rounded-sm",
+							Required:    true,
+						})
+					</div>
+					@button.Button(button.Props{Type: button.TypeSubmit, Class: "rounded-sm"}) {
+						Save room
+					}
+				</form>
+			}
+		}
+		@card.Card(card.Props{Class: "rounded-sm"}) {
+			@card.Header() {
+				<div class="flex items-center justify-between">
+					<div>
+						@card.Title() {
+							Holdings
+						}
+						@card.Description() {
+							Track shares and buy/sell prices. Cost basis is computed from your trades.
+						}
+					</div>
+					@button.Button(button.Props{
+						Variant: button.VariantSecondary,
+						Class:   "flex gap-2 items-center rounded-sm",
+						Href:    routeurl.URL("page.app.spaces.space.accounts.account.investments.holdings.create", "spaceID", props.SpaceID, "accountID", props.AccountID),
+					}) {
+						@icon.Plus()
+						Add holding
+					}
+				</div>
+			}
+			@card.Content() {
+				if len(props.Positions) == 0 {
+					<p class="text-sm text-muted-foreground">No holdings yet. Add one to start tracking shares and trades.</p>
+				} else {
+					<div class="overflow-x-auto">
+						<table class="w-full text-sm">
+							<thead class="text-left text-muted-foreground border-b">
+								<tr>
+									<th class="py-2 pr-2">Symbol</th>
+									<th class="py-2 pr-2">Quantity</th>
+									<th class="py-2 pr-2">Avg cost</th>
+									<th class="py-2 pr-2">Cost basis</th>
+									<th class="py-2 pr-2">Realized P/L</th>
+									<th class="py-2"></th>
+								</tr>
+							</thead>
+							<tbody>
+								for _, pos := range props.Positions {
+									<tr class="border-b last:border-b-0">
+										<td class="py-2 pr-2">
+											<a
+												class="font-medium hover:underline"
+												href={ templ.SafeURL(routeurl.URL("page.app.spaces.space.accounts.account.investments.holdings.holding", "spaceID", props.SpaceID, "accountID", props.AccountID, "holdingID", pos.Holding.ID)) }
+											>
+												{ pos.Holding.Symbol }
+											</a>
+											<div class="text-xs text-muted-foreground">{ pos.Holding.DisplayName }</div>
+										</td>
+										<td class="py-2 pr-2">{ pos.Quantity.StringFixedBank(4) }</td>
+										<td class="py-2 pr-2">${ fmtMoney(pos.AvgCost) }</td>
+										<td class="py-2 pr-2">${ fmtMoney(pos.CostBasis) }</td>
+										<td class={ "py-2 pr-2", plClass(pos.RealizedPL) }>${ fmtMoney(pos.RealizedPL) }</td>
+										<td class="py-2 text-right">
+											@button.Button(button.Props{
+												Variant: button.VariantGhost,
+												Class:   "h-8 px-2",
+												Href:    routeurl.URL("page.app.spaces.space.accounts.account.investments.holdings.holding", "spaceID", props.SpaceID, "accountID", props.AccountID, "holdingID", pos.Holding.ID),
+											}) {
+												@icon.ChevronRight()
+											}
+										</td>
+									</tr>
+								}
+							</tbody>
+						</table>
+					</div>
+				}
+			}
+		}
+	</div>
+}
+
+func remainingValue(s *model.InvestmentAccountSummary) decimal.Decimal {
+	if s.RoomRemaining == nil {
+		return decimal.Zero
+	}
+	return *s.RoomRemaining
+}
--- a/internal/ui/forms/create_account.templ
+++ b/internal/ui/forms/create_account.templ
@ -12,12 +12,26 @@ type CreateAccountProps struct {

 	Name              string
 	Currency          string
+	IsInvestment      bool
+	InvestmentSubtype string

 	NameErr     string
 	CurrencyErr string
+	SubtypeErr  string
 	GeneralErr  string
 }

+var investmentSubtypes = []struct {
+	Value string
+	Label string
+}{
+	{"tfsa", "TFSA"},
+	{"rrsp", "RRSP"},
+	{"fhsa", "FHSA"},
+	{"personal", "Personal / Non-registered"},
+	{"other", "Other"},
+}
+
 templ CreateAccount(props CreateAccountProps) {
 	<form hx-post={ routeurl.URL("action.app.spaces.space.accounts.create", "spaceID", props.SpaceID) }>
 		@card.Card(card.Props{Class: "rounded-sm"}) {
@ -82,6 +96,54 @@ templ CreateAccount(props CreateAccountProps) {
 						}
 					}
 				}
+				{{
+					selectedSubtype := props.InvestmentSubtype
+					if selectedSubtype == "" {
+						selectedSubtype = "tfsa"
+					}
+				}}
+				@form.Item() {
+					<label class="flex items-center gap-2 text-sm font-medium">
+						<input
+							type="checkbox"
+							name="is_investment"
+							value="1"
+							class="h-4 w-4 rounded border-input"
+							checked?={ props.IsInvestment }
+							_="on change toggle .hidden on #investment-subtype-wrapper"
+						/>
+						Investment account
+					</label>
+					@form.Description() {
+						Tracks contributions, contribution room, and holdings.
+					}
+				}
+				<div
+					id="investment-subtype-wrapper"
+					class={ templ.KV("hidden", !props.IsInvestment) }
+				>
+					@form.Item() {
+						@form.Label(form.LabelProps{For: "investment_subtype"}) {
+							Account type
+						}
+						<select
+							id="investment_subtype"
+							name="investment_subtype"
+							class={ "flex h-9 w-full items-center rounded-sm border bg-transparent px-3 py-1 text-sm shadow-sm focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring",
+								templ.KV("border-destructive", props.SubtypeErr != ""),
+								templ.KV("border-input", props.SubtypeErr == "") }
+						>
+							for _, opt := range investmentSubtypes {
+								<option value={ opt.Value } selected?={ selectedSubtype == opt.Value }>{ opt.Label }</option>
+							}
+						</select>
+						if props.SubtypeErr != "" {
+							@form.Message(form.MessageProps{Variant: form.MessageVariantError}) {
+								{ props.SubtypeErr }
+							}
+						}
+					}
+				</div>
 			}
 			@card.Footer(card.FooterProps{Class: "flex justify-end gap-2"}) {
 				@button.Button(button.Props{
--- a/internal/ui/pages/investment_holding_detail.templ
+++ b/internal/ui/pages/investment_holding_detail.templ
@ -0,0 +1,213 @@
+package pages
+
+import (
+	"fmt"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/routeurl"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/badge"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/button"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/card"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/form"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/icon"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/input"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/layouts"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/utils"
+)
+
+type InvestmentHoldingDetailProps struct {
+	SpaceID     string
+	SpaceName   string
+	AccountID   string
+	AccountName string
+	Currency    string
+	Position    model.HoldingPosition
+	Trades      []*model.InvestmentTrade
+}
+
+func holdingPlClass(d string) string {
+	if len(d) > 0 && d[0] == '-' {
+		return "text-red-600 dark:text-red-400"
+	}
+	return "text-green-600 dark:text-green-400"
+}
+
+templ InvestmentHoldingDetailPage(props InvestmentHoldingDetailProps) {
+	@layouts.AppWithBreadcrumb(
+		props.Position.Holding.Symbol,
+		accountChildBreadcrumb(props.SpaceID, props.SpaceName, props.AccountID, props.AccountName, props.Position.Holding.Symbol),
+		spaceOverviewSidebarContent(),
+		spaceSpecificSidebarContent(props.SpaceID),
+		spaceAccountSidebarContent(props.SpaceID, props.AccountID),
+	) {
+		<div class="container px-6 py-8 mx-auto space-y-8">
+			<div class="flex items-start justify-between gap-3 flex-wrap">
+				<div>
+					<h1 class="text-3xl font-bold flex items-center gap-3">
+						{ props.Position.Holding.Symbol }
+						@badge.Badge(badge.Props{Variant: badge.VariantSecondary}) {
+							{ props.Currency }
+						}
+					</h1>
+					<p class="text-muted-foreground">{ props.Position.Holding.DisplayName }</p>
+				</div>
+				<form
+					hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.investments.holdings.holding.delete", "spaceID", props.SpaceID, "accountID", props.AccountID, "holdingID", props.Position.Holding.ID) }
+					hx-confirm="Delete this holding and all its trades?"
+				>
+					@button.Button(button.Props{
+						Type:    button.TypeSubmit,
+						Variant: button.VariantDestructive,
+						Class:   "flex items-center gap-2",
+					}) {
+						@icon.Trash2()
+						Delete holding
+					}
+				</form>
+			</div>
+			@card.Card(card.Props{Class: "rounded-sm"}) {
+				@card.Content(card.ContentProps{Class: "grid grid-cols-2 md:grid-cols-5 gap-4 text-sm p-4"}) {
+					<div>
+						<div class="text-muted-foreground">Quantity</div>
+						<div class="text-lg font-semibold">{ props.Position.Quantity.StringFixedBank(4) }</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">Avg cost</div>
+						<div class="text-lg font-semibold">${ utils.FormatDecimalWithThousands(props.Position.AvgCost.StringFixedBank(2)) }</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">Cost basis</div>
+						<div class="text-lg font-semibold">${ utils.FormatDecimalWithThousands(props.Position.CostBasis.StringFixedBank(2)) }</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">Realized P/L</div>
+						<div class={ "text-lg font-semibold", holdingPlClass(props.Position.RealizedPL.StringFixedBank(2)) }>
+							${ utils.FormatDecimalWithThousands(props.Position.RealizedPL.StringFixedBank(2)) }
+						</div>
+					</div>
+					<div>
+						<div class="text-muted-foreground">Total fees</div>
+						<div class="text-lg font-semibold">${ utils.FormatDecimalWithThousands(props.Position.TotalFees.StringFixedBank(2)) }</div>
+					</div>
+				}
+			}
+			@card.Card(card.Props{Class: "rounded-sm"}) {
+				@card.Header() {
+					@card.Title() {
+						Record a trade
+					}
+					@card.Description() {
+						Manually enter a buy or sell. Quantities and prices recompute the position.
+					}
+				}
+				@card.Content() {
+					<form
+						hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.investments.holdings.holding.trades.create", "spaceID", props.SpaceID, "accountID", props.AccountID, "holdingID", props.Position.Holding.ID) }
+						class="grid grid-cols-1 md:grid-cols-6 gap-3 items-end"
+					>
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "type"}) { Type }
+							<select id="type" name="type" class="h-9 rounded-sm border bg-transparent px-3 text-sm">
+								<option value="buy">Buy</option>
+								<option value="sell">Sell</option>
+							</select>
+						}
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "quantity"}) { Quantity }
+							@input.Input(input.Props{ID: "quantity", Name: "quantity", Type: input.TypeText, Placeholder: "0", Class: "rounded-sm", Required: true})
+						}
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "price"}) { Price / unit }
+							@input.Input(input.Props{ID: "price", Name: "price", Type: input.TypeText, Placeholder: "0.00", Class: "rounded-sm", Required: true})
+						}
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "fees"}) { Fees }
+							@input.Input(input.Props{ID: "fees", Name: "fees", Type: input.TypeText, Placeholder: "0.00", Class: "rounded-sm"})
+						}
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "occurred_at"}) { Date }
+							@input.Input(input.Props{ID: "occurred_at", Name: "occurred_at", Type: input.TypeDate, Value: time.Now().Format("2006-01-02"), Class: "rounded-sm"})
+						}
+						@button.Button(button.Props{Type: button.TypeSubmit, Class: "rounded-sm"}) {
+							Record
+						}
+					</form>
+				}
+			}
+			@card.Card(card.Props{Class: "rounded-sm"}) {
+				@card.Header() {
+					@card.Title() { Trade history }
+				}
+				@card.Content() {
+					if len(props.Trades) == 0 {
+						<p class="text-sm text-muted-foreground">No trades recorded yet.</p>
+					} else {
+						<div class="overflow-x-auto">
+							<table class="w-full text-sm">
+								<thead class="text-left text-muted-foreground border-b">
+									<tr>
+										<th class="py-2 pr-2">Date</th>
+										<th class="py-2 pr-2">Type</th>
+										<th class="py-2 pr-2">Quantity</th>
+										<th class="py-2 pr-2">Price / unit</th>
+										<th class="py-2 pr-2">Fees</th>
+										<th class="py-2 pr-2">Total</th>
+										<th class="py-2"></th>
+									</tr>
+								</thead>
+								<tbody>
+									for _, t := range props.Trades {
+										{{
+											fees := "—"
+											if t.Fees != nil {
+												fees = t.Fees.StringFixedBank(2)
+											}
+											total := t.Quantity.Mul(t.PricePerUnit)
+											typeLabel := "Buy"
+											if string(t.Type) == "sell" {
+												typeLabel = "Sell"
+											}
+										}}
+										<tr class="border-b last:border-b-0">
+											<td class="py-2 pr-2">{ t.OccurredAt.Format("2006-01-02") }</td>
+											<td class="py-2 pr-2">
+												@badge.Badge(badge.Props{
+													Variant: badge.VariantSecondary,
+													Class:   "text-xs",
+												}) {
+													{ typeLabel }
+												}
+											</td>
+											<td class="py-2 pr-2">{ t.Quantity.StringFixedBank(4) }</td>
+											<td class="py-2 pr-2">${ utils.FormatDecimalWithThousands(t.PricePerUnit.StringFixedBank(2)) }</td>
+											<td class="py-2 pr-2">{ fees }</td>
+											<td class="py-2 pr-2">${ utils.FormatDecimalWithThousands(total.StringFixedBank(2)) }</td>
+											<td class="py-2 text-right">
+												<form
+													hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.investments.holdings.holding.trades.trade.delete", "spaceID", props.SpaceID, "accountID", props.AccountID, "holdingID", props.Position.Holding.ID, "tradeID", t.ID) }
+													hx-confirm="Delete this trade?"
+													class="inline"
+												>
+													@button.Button(button.Props{
+														Type:    button.TypeSubmit,
+														Variant: button.VariantGhost,
+														Class:   "h-8 px-2",
+													}) {
+														@icon.Trash2()
+													}
+												</form>
+											</td>
+										</tr>
+									}
+								</tbody>
+							</table>
+						</div>
+					}
+				}
+			}
+		</div>
+	}
+}
+
+var _ = fmt.Sprintf
--- a/internal/ui/pages/investment_holding_form.templ
+++ b/internal/ui/pages/investment_holding_form.templ
@ -0,0 +1,88 @@
+package pages
+
+import (
+	"git.juancwu.dev/juancwu/budgit/internal/routeurl"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/button"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/card"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/form"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/input"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/layouts"
+)
+
+type InvestmentHoldingFormPageProps struct {
+	SpaceID     string
+	SpaceName   string
+	AccountID   string
+	AccountName string
+}
+
+templ InvestmentHoldingFormPage(props InvestmentHoldingFormPageProps) {
+	@layouts.AppWithBreadcrumb(
+		"Add holding",
+		accountChildBreadcrumb(props.SpaceID, props.SpaceName, props.AccountID, props.AccountName, "Add holding"),
+		spaceOverviewSidebarContent(),
+		spaceSpecificSidebarContent(props.SpaceID),
+		spaceAccountSidebarContent(props.SpaceID, props.AccountID),
+	) {
+		<div class="container max-w-3xl px-6 py-8 mx-auto space-y-8">
+			<div>
+				<h1 class="text-3xl font-bold">Add holding</h1>
+				<p class="text-muted-foreground mt-2">
+					Track a symbol inside { props.AccountName }. You can record buy/sell trades after creating it.
+				</p>
+			</div>
+			<form hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.investments.holdings.create", "spaceID", props.SpaceID, "accountID", props.AccountID) }>
+				@card.Card(card.Props{Class: "rounded-sm"}) {
+					@card.Content(card.ContentProps{Class: "p-4 space-y-4"}) {
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "symbol"}) {
+								Symbol
+							}
+							@input.Input(input.Props{
+								ID:          "symbol",
+								Name:        "symbol",
+								Type:        input.TypeText,
+								Placeholder: "e.g. VFV.TO",
+								Class:       "rounded-sm uppercase",
+								Required:    true,
+								Attributes: templ.Attributes{
+									"autocomplete": "off",
+									"autofocus":    "",
+								},
+							})
+							@form.Description() {
+								Use the broker's symbol exactly (e.g. VFV.TO for TSX, AAPL for NASDAQ).
+							}
+						}
+						@form.Item() {
+							@form.Label(form.LabelProps{For: "display_name"}) {
+								Display name
+							}
+							@input.Input(input.Props{
+								ID:          "display_name",
+								Name:        "display_name",
+								Type:        input.TypeText,
+								Placeholder: "e.g. Vanguard S&P 500 Index ETF",
+								Class:       "rounded-sm",
+							})
+							@form.Description() {
+								Optional. Falls back to the symbol if left empty.
+							}
+						}
+					}
+					@card.Footer(card.FooterProps{Class: "flex justify-end gap-2"}) {
+						@button.Button(button.Props{
+							Variant: button.VariantGhost,
+							Href:    routeurl.URL("page.app.spaces.space.accounts.account.overview", "spaceID", props.SpaceID, "accountID", props.AccountID),
+						}) {
+							Cancel
+						}
+						@button.Button(button.Props{Type: button.TypeSubmit}) {
+							Add holding
+						}
+					}
+				}
+			</form>
+		</div>
+	}
+}
--- a/internal/ui/pages/investments_overview.templ
+++ b/internal/ui/pages/investments_overview.templ
@ -0,0 +1,131 @@
+package pages
+
+import (
+	"fmt"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/routeurl"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/badge"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/button"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/card"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/components/icon"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/layouts"
+	"git.juancwu.dev/juancwu/budgit/internal/ui/utils"
+)
+
+type InvestmentOverviewRow struct {
+	SpaceID     string
+	SpaceName   string
+	AccountID   string
+	AccountName string
+	Currency    string
+	Summary     *model.InvestmentAccountSummary
+}
+
+type InvestmentsOverviewProps struct {
+	Year int
+	Rows []InvestmentOverviewRow
+}
+
+templ InvestmentsOverviewPage(props InvestmentsOverviewProps) {
+	@layouts.App("Investments", spaceOverviewSidebarContent()) {
+		<div class="container px-6 py-8 mx-auto space-y-6">
+			<div class="flex items-start justify-between gap-3 flex-wrap">
+				<div>
+					<h1 class="text-3xl font-bold">Investments</h1>
+					<p class="text-muted-foreground mt-1">
+						{ fmt.Sprintf("%d contribution rooms, YTD activity, and total cost basis across your investment accounts.", props.Year) }
+					</p>
+				</div>
+			</div>
+			if len(props.Rows) == 0 {
+				@card.Card(card.Props{Class: "rounded-sm"}) {
+					@card.Content(card.ContentProps{Class: "p-6 space-y-3"}) {
+						<p class="text-sm text-muted-foreground">
+							You don't have any investment accounts yet. In any space, create a new account and check
+							<strong>Investment account</strong> to start tracking contributions and holdings.
+						</p>
+					}
+				}
+			} else {
+				<div class="grid grid-cols-1 md:grid-cols-2 gap-4">
+					for _, row := range props.Rows {
+						{{
+							subtypeLabel := ""
+							if row.Summary != nil && row.Summary.Account != nil && row.Summary.Account.InvestmentSubtype != nil {
+								subtypeLabel = upperString(*row.Summary.Account.InvestmentSubtype)
+							}
+						}}
+						@card.Card(card.Props{Class: "rounded-sm"}) {
+							@card.Header() {
+								<div class="flex items-start justify-between gap-2">
+									<div>
+										@card.Title() {
+											<div class="flex items-center gap-2">
+												{ row.AccountName }
+												if subtypeLabel != "" {
+													@badge.Badge(badge.Props{Variant: badge.VariantSecondary, Class: "text-xs"}) {
+														{ subtypeLabel }
+													}
+												}
+												@badge.Badge(badge.Props{Variant: badge.VariantOutline, Class: "text-xs"}) {
+													{ row.Currency }
+												}
+											</div>
+										}
+										@card.Description() {
+											{ row.SpaceName }
+										}
+									</div>
+									@button.Button(button.Props{
+										Variant: button.VariantGhost,
+										Class:   "h-8 px-2",
+										Href:    routeurl.URL("page.app.spaces.space.accounts.account.overview", "spaceID", row.SpaceID, "accountID", row.AccountID),
+									}) {
+										@icon.ChevronRight()
+									}
+								</div>
+							}
+							@card.Content(card.ContentProps{Class: "grid grid-cols-2 gap-3 text-sm"}) {
+								<div>
+									<div class="text-muted-foreground">YTD Contributions</div>
+									<div class="font-semibold">${ utils.FormatDecimalWithThousands(row.Summary.YTDContributions.StringFixedBank(2)) }</div>
+								</div>
+								<div>
+									<div class="text-muted-foreground">YTD Withdrawals</div>
+									<div class="font-semibold">${ utils.FormatDecimalWithThousands(row.Summary.YTDWithdrawals.StringFixedBank(2)) }</div>
+								</div>
+								<div>
+									<div class="text-muted-foreground">Room remaining</div>
+									<div class="font-semibold">
+										if row.Summary.RoomRemaining != nil {
+											${ utils.FormatDecimalWithThousands(row.Summary.RoomRemaining.StringFixedBank(2)) }
+										} else {
+											<span class="text-muted-foreground italic">Room not set</span>
+										}
+									</div>
+								</div>
+								<div>
+									<div class="text-muted-foreground">Total cost basis</div>
+									<div class="font-semibold">${ utils.FormatDecimalWithThousands(row.Summary.TotalCostBasis.StringFixedBank(2)) }</div>
+								</div>
+							}
+						}
+					}
+				</div>
+			}
+		</div>
+	}
+}
+
+func upperString(s string) string {
+	out := make([]byte, len(s))
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if c >= 'a' && c <= 'z' {
+			c -= 32
+		}
+		out[i] = c
+	}
+	return string(out)
+}
--- a/internal/ui/pages/space_account.templ
+++ b/internal/ui/pages/space_account.templ
@ -22,6 +22,8 @@ type SpaceAccountPageProps struct {
 	RecentTransactions        []*model.Transaction
 	NonEditableTransactionIDs map[string]bool
 	AllocationSummary         *service.AllocationSummary
+	InvestmentSummary         *model.InvestmentAccountSummary
+	InvestmentPositions       []model.HoldingPosition
 }

 templ SpaceAccountPage(props SpaceAccountPageProps) {
@ -91,11 +93,21 @@ templ SpaceAccountPage(props SpaceAccountPageProps) {
 					}
 				}
 			</div>
+			if props.InvestmentSummary != nil {
+				@blocks.InvestmentSection(blocks.InvestmentSectionProps{
+					SpaceID:   props.SpaceID,
+					AccountID: props.AccountID,
+					Currency:  props.AccountCurrency,
+					Summary:   props.InvestmentSummary,
+					Positions: props.InvestmentPositions,
+				})
+			} else {
 				@blocks.AllocationsSection(blocks.AllocationsSectionProps{
 					SpaceID:   props.SpaceID,
 					AccountID: props.AccountID,
 					Summary:   props.AllocationSummary,
 				})
+			}
 			<div>
 				@card.Card() {
 					@card.Header() {
--- a/internal/ui/pages/space_account_settings.templ
+++ b/internal/ui/pages/space_account_settings.templ
@ -6,6 +6,7 @@ import "git.juancwu.dev/juancwu/budgit/internal/ui/layouts"
 import "git.juancwu.dev/juancwu/budgit/internal/ui/components/button"
 import "git.juancwu.dev/juancwu/budgit/internal/ui/components/card"
 import "git.juancwu.dev/juancwu/budgit/internal/ui/components/dialog"
+import "git.juancwu.dev/juancwu/budgit/internal/ui/components/form"
 import "git.juancwu.dev/juancwu/budgit/internal/ui/components/icon"

 type SpaceAccountSettingsPageProps struct {
@ -14,6 +15,8 @@ type SpaceAccountSettingsPageProps struct {
 	AccountID         string
 	AccountName       string
 	AccountCurrency   string
+	IsInvestment      bool
+	InvestmentSubtype string
 	UpdateForm        forms.UpdateAccountProps
 	CurrencyForm      forms.ChangeAccountCurrencyProps
 }
@ -35,6 +38,68 @@ templ SpaceAccountSettingsPage(props SpaceAccountSettingsPageProps) {
 			</div>
 			@forms.UpdateAccount(props.UpdateForm)
 			@forms.ChangeAccountCurrency(props.CurrencyForm)
+			@card.Card(card.Props{Class: "rounded-sm"}) {
+				@card.Header() {
+					@card.Title() {
+						Investment account
+					}
+					@card.Description() {
+						Flag this account to track contribution room, holdings, and trades.
+					}
+				}
+				@card.Content() {
+					{{
+						selectedSubtype := props.InvestmentSubtype
+						if selectedSubtype == "" {
+							selectedSubtype = "tfsa"
+						}
+					}}
+					<form
+						hx-post={ routeurl.URL("action.app.spaces.space.accounts.account.settings.investment", "spaceID", props.SpaceID, "accountID", props.AccountID) }
+						class="space-y-4"
+					>
+						@form.Item() {
+							<label class="flex items-center gap-2 text-sm font-medium">
+								<input
+									type="checkbox"
+									name="is_investment"
+									value="1"
+									class="h-4 w-4 rounded border-input"
+									checked?={ props.IsInvestment }
+									_="on change toggle .hidden on #settings-subtype-wrapper"
+								/>
+								Track as an investment account
+							</label>
+						}
+						<div
+							id="settings-subtype-wrapper"
+							class={ templ.KV("hidden", !props.IsInvestment) }
+						>
+							@form.Item() {
+								@form.Label(form.LabelProps{For: "settings-subtype"}) {
+									Account type
+								}
+								<select
+									id="settings-subtype"
+									name="investment_subtype"
+									class="flex h-9 w-full items-center rounded-sm border bg-transparent px-3 py-1 text-sm shadow-sm focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring border-input"
+								>
+									<option value="tfsa" selected?={ selectedSubtype == "tfsa" }>TFSA</option>
+									<option value="rrsp" selected?={ selectedSubtype == "rrsp" }>RRSP</option>
+									<option value="fhsa" selected?={ selectedSubtype == "fhsa" }>FHSA</option>
+									<option value="personal" selected?={ selectedSubtype == "personal" }>Personal / Non-registered</option>
+									<option value="other" selected?={ selectedSubtype == "other" }>Other</option>
+								</select>
+							}
+						</div>
+						<div class="flex justify-end">
+							@button.Button(button.Props{Type: button.TypeSubmit}) {
+								Save investment settings
+							}
+						</div>
+					</form>
+				}
+			}
 			@card.Card(card.Props{Class: "rounded-sm border-destructive"}) {
 				@card.Header() {
 					@card.Title(card.TitleProps{Class: "text-destructive"}) {
--- a/internal/ui/pages/spaces.templ
+++ b/internal/ui/pages/spaces.templ
@ -99,6 +99,16 @@ templ spaceOverviewSidebarContent() {
 					<span>Shared with me</span>
 				}
 			}
+			@sidebar.MenuItem() {
+				@sidebar.MenuButton(sidebar.MenuButtonProps{
+					Href:     routeurl.URL("page.app.investments"),
+					IsActive: ctxkeys.URLPath(ctx) == routeurl.URL("page.app.investments"),
+					Tooltip:  "Investments",
+				}) {
+					@icon.TrendingUp()
+					<span>Investments</span>
+				}
+			}
 		}
 	}
 }