Under the scheme of distribution of legislative powers in the Constitution of India, a subject which is not enumerated in either the State List or the Concurrent List falls within the residuary field of legislation. Such residuary power is vested in :

Article 248 of the Constitution of India explicitly vests the residuary powers of legislation in the Parliament. This ensures that any matter not explicitly mentioned in the State List (List II) or the Concurrent List (List III) falls under the exclusive legislative competence of the Union Parliament, as further enumerated under Entry 97 of List I (Union List).