diff --git a/homeassistant/loader.py b/homeassistant/loader.py
index f19577ac10a..46f3e352596 100644
--- a/homeassistant/loader.py
+++ b/homeassistant/loader.py
@@ -742,7 +742,10 @@ class Integration:
     @cached_property
     def import_executor(self) -> bool:
         """Import integration in the executor."""
-        return self.manifest.get("import_executor") or False
+        # If the integration does not explicitly set import_executor, we default to
+        # True if it's a built-in integration and False if it's a custom integration.
+        # In the future, we want to default to True for all integrations.
+        return self.manifest.get("import_executor", self.is_built_in)
 
     @property
     def mqtt(self) -> list[str] | None:
diff --git a/tests/test_loader.py b/tests/test_loader.py
index fdbc457dfe0..0c0431ed227 100644
--- a/tests/test_loader.py
+++ b/tests/test_loader.py
@@ -1033,6 +1033,14 @@ async def test_async_suggest_report_issue(
     )
 
 
+def test_import_executor_default(hass: HomeAssistant) -> None:
+    """Test that import_executor defaults."""
+    custom_comp = mock_integration(hass, MockModule("any_random"), built_in=False)
+    assert custom_comp.import_executor is False
+    built_in_comp = mock_integration(hass, MockModule("other_random"), built_in=True)
+    assert built_in_comp.import_executor is True
+
+
 async def test_config_folder_not_in_path(hass):
     """Test that config folder is not in path."""