diff --git a/homeassistant/components/todoist/calendar.py b/homeassistant/components/todoist/calendar.py
index e3f87043e02..baa7103f7eb 100644
--- a/homeassistant/components/todoist/calendar.py
+++ b/homeassistant/components/todoist/calendar.py
@@ -436,7 +436,7 @@ class TodoistProjectData:
 
         self._coordinator = coordinator
         self._name = project_data[CONF_NAME]
-        # If no ID is defined, fetch all tasks.
+        # If no ID is defined, this is a custom project.
         self._id = project_data.get(CONF_ID)
 
         # All labels the user has defined, for easy lookup.
@@ -497,6 +497,13 @@ class TodoistProjectData:
             SUMMARY: data.content,
         }
 
+        if (
+            self._project_id_whitelist
+            and data.project_id not in self._project_id_whitelist
+        ):
+            # Project isn't in `include_projects` filter.
+            return None
+
         # All task Labels (optional parameter).
         task[LABELS] = [
             label.name for label in self._labels if label.name in data.labels
@@ -625,10 +632,7 @@ class TodoistProjectData:
         tasks = self._coordinator.data
         if self._id is None:
             project_task_data = [
-                task
-                for task in tasks
-                if not self._project_id_whitelist
-                or task.project_id in self._project_id_whitelist
+                task for task in tasks if self.create_todoist_task(task) is not None
             ]
         else:
             project_task_data = [task for task in tasks if task.project_id == self._id]
diff --git a/tests/components/todoist/test_calendar.py b/tests/components/todoist/test_calendar.py
index 8ba4da9b2e8..d8123af3231 100644
--- a/tests/components/todoist/test_calendar.py
+++ b/tests/components/todoist/test_calendar.py
@@ -366,6 +366,73 @@ async def test_task_due_datetime(
     assert await response.json() == []
 
 
+@pytest.mark.parametrize(
+    ("todoist_config", "due", "start", "end", "expected_response"),
+    [
+        (
+            {"custom_projects": [{"name": "Test", "labels": ["Label1"]}]},
+            Due(date="2023-03-30", is_recurring=False, string="Mar 30"),
+            "2023-03-28T00:00:00.000Z",
+            "2023-04-01T00:00:00.000Z",
+            [get_events_response({"date": "2023-03-30"}, {"date": "2023-03-31"})],
+        ),
+        (
+            {"custom_projects": [{"name": "Test", "labels": ["custom"]}]},
+            Due(date="2023-03-30", is_recurring=False, string="Mar 30"),
+            "2023-03-28T00:00:00.000Z",
+            "2023-04-01T00:00:00.000Z",
+            [],
+        ),
+        (
+            {"custom_projects": [{"name": "Test", "include_projects": ["Name"]}]},
+            Due(date="2023-03-30", is_recurring=False, string="Mar 30"),
+            "2023-03-28T00:00:00.000Z",
+            "2023-04-01T00:00:00.000Z",
+            [get_events_response({"date": "2023-03-30"}, {"date": "2023-03-31"})],
+        ),
+        (
+            {"custom_projects": [{"name": "Test", "due_date_days": 1}]},
+            Due(date="2023-03-30", is_recurring=False, string="Mar 30"),
+            "2023-03-28T00:00:00.000Z",
+            "2023-04-01T00:00:00.000Z",
+            [get_events_response({"date": "2023-03-30"}, {"date": "2023-03-31"})],
+        ),
+        (
+            {"custom_projects": [{"name": "Test", "due_date_days": 1}]},
+            Due(
+                date=(dt_util.now() + timedelta(days=2)).strftime("%Y-%m-%d"),
+                is_recurring=False,
+                string="Mar 30",
+            ),
+            dt_util.now().isoformat(),
+            (dt_util.now() + timedelta(days=5)).isoformat(),
+            [],
+        ),
+    ],
+    ids=[
+        "in_labels_whitelist",
+        "not_in_labels_whitelist",
+        "in_include_projects",
+        "in_due_date_days",
+        "not_in_due_date_days",
+    ],
+)
+async def test_events_filtered_for_custom_projects(
+    hass: HomeAssistant,
+    hass_client: ClientSessionGenerator,
+    start: str,
+    end: str,
+    expected_response: dict[str, Any],
+) -> None:
+    """Test we filter out tasks from custom projects based on their config."""
+    client = await hass_client()
+    response = await client.get(
+        get_events_url("calendar.test", start, end),
+    )
+    assert response.status == HTTPStatus.OK
+    assert await response.json() == expected_response
+
+
 @pytest.mark.parametrize(
     ("due", "setup_platform"),
     [