Except for removals in bond and transfers in bond, as authorized by law, the taxes imposed on tobacco products by section 5701, I.R.C., shall be determined at the time of removal of such products and paid on the basis of a return, in accordance with the provisions of this part.
27 C.F.R. § 40.161
72 Stat. 1417; 26 U.S.C. 5703