ARTICLE 84
The Commonwealth has authority to regulate by law:
1. The organization of the State tax administrations so far as is required for the uniform and impartial execution of the national tax laws;
2. The organization and functions of the authorities charged with the supervision of the execution of the national tax laws;
3. The accounting with the States;
4. The reimbursement of the costs of administration in connection with the execution of the national tax laws.