diff --git a/backend/api_test.go b/backend/api_test.go
index 67918f9..742dcbc 100644
--- a/backend/api_test.go
+++ b/backend/api_test.go
@@ -594,6 +594,38 @@ func TestCompleteTask(t *testing.T) {
 	}
 }
 
+func TestCompleteTaskAllowanceWeightsSumTo0(t *testing.T) {
+	e := startServer(t)
+	taskId := createTestTaskWithAmount(e, 101)
+
+	e.GET("/tasks").Expect().Status(200).JSON().Array().Length().IsEqual(1)
+
+	// Update rest allowance
+	e.PUT("/user/1/allowance/0").WithJSON(UpdateAllowanceRequest{
+		Weight: 0,
+	}).Expect().Status(200)
+	// Create two allowance goals
+	e.POST("/user/1/allowance").WithJSON(CreateAllowanceRequest{
+		Name:   "Test Allowance 1",
+		Target: 1000,
+		Weight: 0,
+	}).Expect().Status(201)
+
+	// Complete the task
+	e.POST("/task/" + strconv.Itoa(taskId) + "/complete").Expect().Status(200)
+
+	// Verify the task is marked as completed
+	e.GET("/task/" + strconv.Itoa(taskId)).Expect().Status(404)
+
+	// Verify the allowances are updated for user 1
+	allowances := e.GET("/user/1/allowance").Expect().Status(200).JSON().Array()
+	allowances.Length().IsEqual(2)
+	allowances.Value(0).Object().Value("id").Number().IsEqual(0)
+	allowances.Value(0).Object().Value("progress").Number().IsEqual(101)
+	allowances.Value(1).Object().Value("id").Number().IsEqual(1)
+	allowances.Value(1).Object().Value("progress").Number().IsEqual(0)
+}
+
 func TestCompleteTaskInvalidId(t *testing.T) {
 	e := startServer(t)
 	e.POST("/task/999/complete").Expect().Status(404)