diff --git a/models/plan.go b/models/plan.go
index 02e0212..b6bb432 100644
--- a/models/plan.go
+++ b/models/plan.go
@@ -8,6 +8,7 @@ import (
 type Plan struct {
 	PlanID   int64      `json:"plan_id"`
 	PlanDate *time.Time `json:"plan_date"`
+	UserID   int64      `json:"user_id"`
 }
 
 // Plans returns all plans in the model.
diff --git a/routes/plans.go b/routes/plans.go
index edcab49..ff1c64d 100644
--- a/routes/plans.go
+++ b/routes/plans.go
@@ -79,7 +79,8 @@ func postPlanFunc(m *models.Model) http.HandlerFunc {
 			return
 		}
 
-		plan := &models.Plan{PlanDate: p.PlanDate}
+		// Map the fields we allow to be set to the plan to be created.
+		plan := &models.Plan{PlanDate: p.PlanDate, UserID: p.UserID}
 		id, err := m.AddPlan(plan)
 		if err != nil {
 			serverError(w, err)
diff --git a/routes/plans_test.go b/routes/plans_test.go
index 03fd375..51043be 100644
--- a/routes/plans_test.go
+++ b/routes/plans_test.go
@@ -37,7 +37,7 @@ func TestOnePlan(t *testing.T) {
 	// set up
 	assert := assert.New(t)
 	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
-	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate, UserID: 3}
 	m := getEmptyModel()
 	m.AddPlan(p)
 	router := routes.NewPlanRouter(m)
@@ -55,7 +55,8 @@ func TestOnePlan(t *testing.T) {
 	expected := `[
 		{
 			"plan_id": 1,
-			"plan_date": "2021-01-01T00:00:00Z"
+			"plan_date": "2021-01-01T00:00:00Z",
+			"user_id": 3
 		}
 	]`
 	assert.JSONEq(expected, rr.Body.String())
@@ -109,7 +110,7 @@ func TestOnePlanByID(t *testing.T) {
 	// set up
 	assert := assert.New(t)
 	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
-	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate, UserID: 3}
 	m := getEmptyModel()
 	m.AddPlan(p)
 	router := routes.NewPlanRouter(m)
@@ -126,7 +127,8 @@ func TestOnePlanByID(t *testing.T) {
 	// We pass in the date as a time.time so it makes sense that it comes back with a midnight timestamp.
 	expected := `{
 			"plan_id": 1,
-			"plan_date": "2021-01-01T00:00:00Z"
+			"plan_date": "2021-01-01T00:00:00Z",
+			"user_id": 3
 		}`
 	assert.JSONEq(expected, rr.Body.String())
 	contentType := rr.Header().Get("Content-Type")
diff --git a/routes/post_plan_test.go b/routes/post_plan_test.go
index 77ec78a..9ad7902 100644
--- a/routes/post_plan_test.go
+++ b/routes/post_plan_test.go
@@ -17,7 +17,7 @@ func TestCreatePlanRoute(t *testing.T) {
 	// set up
 	assert := assert.New(t)
 	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
-	p := &models.Plan{PlanID: 6, PlanDate: &planDate}
+	p := &models.Plan{PlanID: 6, PlanDate: &planDate, UserID: 3}
 	m := getEmptyModel()
 	m.AddPlan(p)
 	router := routes.NewPlanRouter(m)
@@ -36,7 +36,8 @@ func TestCreatePlanRoute(t *testing.T) {
 	expected := `{
 		"created_plan": {
 			"plan_id": 2,
-			"plan_date": "2021-01-01T00:00:00Z"
+			"plan_date": "2021-01-01T00:00:00Z",
+			"user_id": 3
 		},
 		"id": 2
 	}`
@@ -49,13 +50,14 @@ func TestPureJSON(t *testing.T) {
 	// set up
 	assert := assert.New(t)
 	planDate, _ := time.Parse("2006-01-02", "2021-01-01")
-	p := &models.Plan{PlanID: 1, PlanDate: &planDate}
+	p := &models.Plan{PlanID: 1, PlanDate: &planDate, UserID: 3}
 	m := getEmptyModel()
 	m.AddPlan(p)
 	router := routes.NewPlanRouter(m)
 	data := []byte(`{
 			"plan_date": "2021-01-01T00:00:00Z",
-			"plan_id": 1
+			"plan_id": 1,
+			"user_id": 3
 		}`)
 	req, _ := http.NewRequest("POST", "/", bytes.NewBuffer(data))
 	req.Header.Set("Content-Type", "application/json")
@@ -71,6 +73,7 @@ func TestPureJSON(t *testing.T) {
 	expected := `{
 		"created_plan": {
 			"plan_id": 2,
+			"user_id": 3,
 			"plan_date": "2021-01-01T00:00:00Z"
 		},
 		"id": 2
diff --git a/store/migrations/000001_create_action_table.up.sql b/store/migrations/000001_create_action_table.up.sql
index 9b48f0b..b95dcd0 100644
--- a/store/migrations/000001_create_action_table.up.sql
+++ b/store/migrations/000001_create_action_table.up.sql
@@ -1,6 +1,7 @@
 CREATE TABLE IF NOT EXISTS plans(
 	plan_id serial PRIMARY KEY,
 	plan_date DATE NOT NULL,
+	user_id int REFERENCES users(user_id),
 	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
 	updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
 );