27 C.F.R. § 41.101
(c) The excise tax on tobacco products and cigarette papers and tubes of Puerto Rican manufacture may be prepaid in Puerto Rico prior to shipment of such articles to the United States in accordance with § 41.105. In the case of tobacco products such tax may be paid in Puerto Rico on the basis of a semi-monthly return in accordance with the applicable provisions of this subpart.
(68A Stat. 907, as amended, 72 Stat. 1417, 1418, as amended (26 U.S.C. 7652, 5703, 5704))
[T.D. ATF-206, 50 FR 15888, Apr. 23, 1985, as amended by T.D. ATF-232, 51 FR 28085, Aug. 5, 1986; T.D. ATF-243, 52 FR 43194, Dec. 1, 1986; T.D. ATF-246, 52 FR 669, Jan. 8, 1987; T.D. ATF-422, 64 FR 71950, Dec. 22, 1999. Redesignated and amended by T.D. TTB-16, 69 FR 52424, 52425, Aug. 26, 2004]