diff --git a/pkg/expenses.go b/pkg/expenses.go
index 97e3179..dc0ecf3 100644
--- a/pkg/expenses.go
+++ b/pkg/expenses.go
@@ -237,3 +237,32 @@ func HandleAddExpense(w http.ResponseWriter, r *http.Request, _ httprouter.Param
 	conn.MustExec(r.Context(), "select add_expense($1, $2, $3, $4, $5, $6, $7)", company.Id, form.InvoiceDate, form.Invoicer, form.InvoiceNumber, form.Amount, taxes, form.Tags)
 	htmxRedirect(w, r, companyURI(company, "/expenses"))
 }
+
+func HandleUpdateExpense(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
+	conn := getConn(r)
+	locale := getLocale(r)
+	company := mustGetCompany(r)
+	form := newExpenseForm(r.Context(), conn, locale, company)
+	if err := form.Parse(r); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	if err := verifyCsrfTokenValid(r); err != nil {
+		http.Error(w, err.Error(), http.StatusForbidden)
+		return
+	}
+	slug := params[0].Value
+	if !form.Validate() {
+		if !IsHTMxRequest(r) {
+			w.WriteHeader(http.StatusUnprocessableEntity)
+		}
+		mustRenderEditExpenseForm(w, r, slug, form)
+		return
+	}
+	taxes := mustSliceAtoi(form.Tax.Selected)
+	if found := conn.MustGetText(r.Context(), "", "select edit_expense($1, $2, $3, $4, $5, $6, $7)", slug, form.InvoiceDate, form.Invoicer, form.InvoiceNumber, form.Amount, taxes, form.Tags); found == "" {
+		http.NotFound(w, r)
+		return
+	}
+	htmxRedirect(w, r, companyURI(company, "/expenses"))
+}
diff --git a/pkg/router.go b/pkg/router.go
index d1bac87..9d00f18 100644
--- a/pkg/router.go
+++ b/pkg/router.go
@@ -37,6 +37,7 @@ func NewRouter(db *Db) http.Handler {
 	companyRouter.GET("/expenses", IndexExpenses)
 	companyRouter.POST("/expenses", HandleAddExpense)
 	companyRouter.GET("/expenses/:slug", ServeExpenseForm)
+	companyRouter.PUT("/expenses/:slug", HandleUpdateExpense)
 	companyRouter.GET("/", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
 		mustRenderMainTemplate(w, r, "dashboard.gohtml", nil)
 	})