diff --git a/bin/report_radio_invalid_default_values.py b/bin/report_radio_invalid_default_values.py
new file mode 100644
index 0000000000..b3817682c5
--- /dev/null
+++ b/bin/report_radio_invalid_default_values.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+import django
+
+from tabulate import tabulate
+
+
+def report_null_values() -> bool:
+    from openforms.forms.models import FormDefinition
+
+    problems = []
+
+    form_definitions = FormDefinition.objects.iterator()
+    for fd in form_definitions:
+        for component in fd.iter_components():
+            default_value = component["defaultValue"]
+
+            if (
+                component["type"] == "radio"
+                and isinstance(default_value, str)
+                and bool(default_value)
+            ):
+                expected_values = [
+                    radio_value["value"] for radio_value in component["values"]
+                ]
+
+                if default_value not in expected_values:
+                    problems.append(
+                        [
+                            fd,
+                            component["label"],
+                            default_value,
+                        ]
+                    )
+
+    if not problems:
+        print("No invalid default values found.")
+        return True
+
+    print("Found invalid default values in form definition radio components.")
+    print("")
+    print(
+        tabulate(
+            problems,
+            headers=("Form definition", "Component label", "Invalid value"),
+        )
+    )
+
+    return False
+
+
+def main(skip_setup=False) -> bool:
+    from openforms.setup import setup_env
+
+    if not skip_setup:
+        setup_env()
+        django.setup()
+
+    return report_null_values()
+
+
+if __name__ == "__main__":
+    main()