26.111—General.
All taxes imposed by 26 U.S.C. 7652(a), and which, under the provisions of this part, are paid in Puerto Rico, shall be paid and collected on the basis of a tax return as provided in this subpart. Any tax which has been paid in accordance with the provisions of this part in effect at the time of such payment, and before provision was made in the part for payment of such tax by return, shall be deemed to have been prepaid as prescribed in this part.