diff --git a/backend/api_test.go b/backend/api_test.go
index 2fc70a1..6afd361 100644
--- a/backend/api_test.go
+++ b/backend/api_test.go
@@ -248,7 +248,16 @@ func TestCreateTask(t *testing.T) {
 
 	// Verify the response has an ID
 	response.ContainsKey("id")
-	taskId := response.Value("id").Number().Raw()
+	response.Value("id").Number().IsEqual(1)
+
+	e.GET("/tasks").Expect().Status(200).JSON().Array().Length().IsEqual(1)
+
+	// Get task
+	result := e.GET("/task/1").Expect().Status(200).JSON().Object()
+	result.Value("id").IsEqual(1)
+	result.Value("name").IsEqual("Test Task")
+	result.Value("reward").IsEqual(100)
+	result.Value("assigned").IsNull()
 
 	// Create a new task with assigned user
 	assignedUserId := 1
@@ -265,7 +274,7 @@ func TestCreateTask(t *testing.T) {
 		JSON().Object()
 
 	responseWithUser.ContainsKey("id")
-	responseWithUser.Value("id").Number().NotEqual(taskId) // Ensure different ID
+	responseWithUser.Value("id").Number().IsEqual(2)
 }
 
 func TestDeleteTask(t *testing.T) {
@@ -345,12 +354,12 @@ func TestGetTaskWhenNoTasks(t *testing.T) {
 	result.Length().IsEqual(0)
 }
 
-func createTestTask(e *httpexpect.Expect) {
+func createTestTask(e *httpexpect.Expect) int {
 	requestBody := map[string]interface{}{
 		"name":   "Test Task",
 		"reward": 100,
 	}
-	e.POST("/tasks").WithJSON(requestBody).Expect().Status(201)
+	return int(e.POST("/tasks").WithJSON(requestBody).Expect().Status(201).JSON().Object().Value("id").Number().Raw())
 }
 
 func TestGetTasksWhenTasks(t *testing.T) {
@@ -522,36 +531,39 @@ func TestPutAllowanceById(t *testing.T) {
 
 func TestCompleteTask(t *testing.T) {
 	e := startServer(t)
-	createTestTask(e)
+	taskId := createTestTask(e)
 
-	// Create a task
-	requestBody := map[string]interface{}{
-		"name":   "Test Task",
-		"reward": 100,
-	}
-	e.POST("/tasks").WithJSON(requestBody).Expect().Status(201)
+	e.GET("/tasks").Expect().Status(200).JSON().Array().Length().IsEqual(1)
 
 	// Create two allowance goals
 	e.POST("/user/1/allowance").WithJSON(CreateAllowanceRequest{
 		Name:   "Test Allowance 1",
 		Target: 1000,
 		Weight: 50,
-	}).Expect().Status(200)
+	}).Expect().Status(201)
 	e.POST("/user/1/allowance").WithJSON(CreateAllowanceRequest{
 		Name:   "Test Allowance 1",
 		Target: 1000,
 		Weight: 25,
-	}).Expect().Status(200)
+	}).Expect().Status(201)
 	e.PUT("/user/1/allowance/0").WithJSON(UpdateAllowanceRequest{
 		Weight: 25,
-	})
+	}).Expect().Status(200)
 
 	// Complete the task
-	e.POST("/task/1/complete").Expect().Status(200)
+	e.POST("/task/" + strconv.Itoa(taskId) + "/complete").Expect().Status(200)
 
 	// Verify the task is marked as completed
-	result := e.GET("/task/1").Expect().Status(200).JSON().Object()
-	result.Value("completed").Boolean().IsTrue()
+	e.GET("/task/" + strconv.Itoa(taskId)).Expect().Status(404)
+	// Verify the allowances are updated
+	allowances := e.GET("/user/1/allowance").Expect().Status(200).JSON().Array()
+	allowances.Length().IsEqual(3)
+	allowances.Value(0).Object().Value("id").Number().IsEqual(0)
+	allowances.Value(0).Object().Value("progress").Number().IsEqual(50)
+	allowances.Value(0).Object().Value("id").Number().IsEqual(1)
+	allowances.Value(1).Object().Value("progress").Number().IsEqual(25)
+	allowances.Value(0).Object().Value("id").Number().IsEqual(2)
+	allowances.Value(2).Object().Value("progress").Number().IsEqual(26)
 }
 
 func getDelta(base time.Time, delta float64) (time.Time, time.Time) {
diff --git a/backend/db.go b/backend/db.go
index 31ba5e3..6b3c221 100644
--- a/backend/db.go
+++ b/backend/db.go
@@ -71,7 +71,14 @@ func (db *Db) GetUserAllowances(userId int) ([]Allowance, error) {
 	allowances := make([]Allowance, 0)
 	var err error
 
-	for row := range db.db.Query("select id, name, target, progress, weight from allowances where user_id = ?").
+	totalAllowance := Allowance{}
+	err = db.db.Query("select balance, weight from users where id = ?").Bind(userId).ScanSingle(&totalAllowance.Progress, &totalAllowance.Weight)
+	if err != nil {
+		return nil, err
+	}
+	allowances = append(allowances, totalAllowance)
+
+	for row := range db.db.Query("select id, name, target, balance, weight from allowances where user_id = ?").
 		Bind(userId).Range(&err) {
 		allowance := Allowance{}
 		err = row.Scan(&allowance.ID, &allowance.Name, &allowance.Target, &allowance.Progress, &allowance.Weight)
@@ -88,7 +95,7 @@ func (db *Db) GetUserAllowances(userId int) ([]Allowance, error) {
 
 func (db *Db) GetUserAllowanceById(userId int, allowanceId int) (*Allowance, error) {
 	allowance := &Allowance{}
-	err := db.db.Query("select id, name, target, progress, weight from allowances where user_id = ? and id = ?").
+	err := db.db.Query("select id, name, target, balance, weight from allowances where user_id = ? and id = ?").
 		Bind(userId, allowanceId).
 		ScanSingle(&allowance.ID, &allowance.Name, &allowance.Target, &allowance.Progress, &allowance.Weight)
 	if err != nil {
@@ -305,6 +312,65 @@ func (db *Db) UpdateTask(id int, task *CreateTaskRequest) error {
 	return tx.Commit()
 }
 
+func (db *Db) CompleteTask(taskId int) error {
+	tx, err := db.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.MustRollback()
+
+	var reward int
+	err = tx.Query("select reward from tasks where id = ?").Bind(taskId).ScanSingle(&reward)
+	if err != nil {
+		return err
+	}
+
+	for userRow := range tx.Query("select id, weight from users").Range(&err) {
+		var userId int
+		var userWeight float64
+		err = userRow.Scan(&userId, &userWeight)
+		if err != nil {
+			return err
+		}
+
+		var sumOfWeights float64
+		err = tx.Query("select sum(weight) from allowances where user_id = ? and weight > 0").Bind(userId).ScanSingle(&sumOfWeights)
+
+		for allowanceRow := range tx.Query("select id, weight from allowances where user_id = ? and weight > 0").Bind(userId).Range(&err) {
+			var allowanceId int
+			var allowanceWeight float64
+			err = allowanceRow.Scan(&allowanceId, &allowanceWeight)
+			if err != nil {
+				return err
+			}
+
+			// Calculate the amount to add to the allowance
+			amount := int((allowanceWeight / sumOfWeights) * float64(reward))
+			err = tx.Query("update allowances set balance = balance + ? where id = ? and user_id = ?").
+				Bind(amount, allowanceId, userId).Exec()
+			if err != nil {
+				return err
+			}
+			reward -= amount
+		}
+
+		// Add the remaining reward to the user
+		err = tx.Query("update users set balance = balance + ? where id = ?").
+			Bind(reward, userId).Exec()
+		if err != nil {
+			return err
+		}
+	}
+	if err != nil {
+		return err
+	}
+
+	// Remove the task
+	err = tx.Query("delete from tasks where id = ?").Bind(taskId).Exec()
+
+	return tx.Commit()
+}
+
 func (db *Db) AddHistory(userId int, allowance *PostHistory) error {
 	tx, err := db.db.Begin()
 	if err != nil {
diff --git a/backend/go.mod b/backend/go.mod
index f231ba2..8ce55ec 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -3,7 +3,7 @@ module allowance_planner
 go 1.24.2
 
 require (
-	gitea.seeseepuff.be/seeseemelk/mysqlite v0.12.0
+	gitea.seeseepuff.be/seeseemelk/mysqlite v0.13.0
 	github.com/gavv/httpexpect/v2 v2.17.0
 	github.com/gin-contrib/cors v1.7.5
 	github.com/gin-gonic/gin v1.10.0
diff --git a/backend/go.sum b/backend/go.sum
index d07840c..2e7fa76 100644
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -1,5 +1,7 @@
 gitea.seeseepuff.be/seeseemelk/mysqlite v0.12.0 h1:kl0VFgvm52UKxJhZpf1hvucxZdOoXY50g/VmzsWH+/8=
 gitea.seeseepuff.be/seeseemelk/mysqlite v0.12.0/go.mod h1:cgswydOxJjMlNwfcBIXnKjr47LwXnMT9BInkiHb0tXE=
+gitea.seeseepuff.be/seeseemelk/mysqlite v0.13.0 h1:nqSXu5i5fHB1rrx/kfi8Phn/J6eFa2yh02FiGc9U1yg=
+gitea.seeseepuff.be/seeseemelk/mysqlite v0.13.0/go.mod h1:cgswydOxJjMlNwfcBIXnKjr47LwXnMT9BInkiHb0tXE=
 github.com/TylerBrock/colorjson v0.0.0-20200706003622-8a50f05110d2 h1:ZBbLwSJqkHBuFDA6DUhhse0IGJ7T5bemHyNILUjvOq4=
 github.com/TylerBrock/colorjson v0.0.0-20200706003622-8a50f05110d2/go.mod h1:VSw57q4QFiWDbRnjdX8Cb3Ow0SFncRw+bA/ofY6Q83w=
 github.com/ajg/form v1.5.1 h1:t9c7v8JUKu/XxOGBU0yjNpaMloxGEJhUkqFRq0ibGeU=
diff --git a/backend/main.go b/backend/main.go
index ab99b33..53eec79 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -414,6 +414,29 @@ func deleteTask(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "Task deleted successfully"})
 }
 
+func completeTask(c *gin.Context) {
+	taskIdStr := c.Param("taskId")
+	taskId, err := strconv.Atoi(taskIdStr)
+	if err != nil {
+		log.Printf("Invalid task ID: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid task ID"})
+		return
+	}
+
+	err = db.CompleteTask(taskId)
+	if errors.Is(err, mysqlite.ErrNoRows) {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Task not found"})
+		return
+	}
+	if err != nil {
+		log.Printf("Error completing task: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Task completed successfully"})
+}
+
 func postHistory(c *gin.Context) {
 	userIdStr := c.Param("userId")
 	userId, err := strconv.Atoi(userIdStr)
@@ -495,6 +518,7 @@ func start(ctx context.Context, config *ServerConfig) {
 	router.GET("/api/task/:taskId", getTask)
 	router.PUT("/api/task/:taskId", putTask)
 	router.DELETE("/api/task/:taskId", deleteTask)
+	router.POST("/api/task/:taskId/complete", completeTask)
 
 	srv := &http.Server{
 		Addr:    config.Addr,
diff --git a/backend/migrations/1_initial.sql b/backend/migrations/1_initial.sql
index abf29fe..c787888 100644
--- a/backend/migrations/1_initial.sql
+++ b/backend/migrations/1_initial.sql
@@ -20,7 +20,7 @@ create table allowances
 	user_id integer not null,
     name text not null,
     target integer not null,
-    progress integer not null default 0,
+    balance integer not null default 0,
     weight real not null
 );