Distribution of legislative subjects defines Union, State and concurrent law making powers and tax allocation under the Constitution. Allocation of legislative subjects among List I (Union), List II (State) and List III (Concurrent) under Article 246 establishes the scheme of legislative competence. List I reserves national matters-defence, foreign affairs, currency, interstate trade, incorporation of all India corporations, intellectual property and specified Union taxation-while List II assigns local and state matters-public order, police, land, agriculture, local government and state taxes-subject to qualifications and cross references. List III contains subjects of shared competence such as criminal and civil procedure, labour welfare, education and trade regulation. Amendment notes record historical changes to entries and fiscal reallocations.