27 C.F.R. § 25.166
(b) By claim for refund of tax. A brewer, eligible to pay the reduced rate of tax on beer during a calendar year, but who has not paid the reduced rate of tax by return during that year, may file a claim using form TTB F 5620.8, for refund of tax excessively paid on beer during that year. Claims for refund of tax will be filed as provided in § 25.285.
(Sec. 201, Pub. L. 85-859, 72 Stat. 1333, as amended (26 U.S.C. 5051))
[T.D. ATF-224, 51 FR 7673, Mar. 5, 1987, as amended by T.D. ATF-251, 52 FR 19313, May 22, 1987; T.D. TTB-41, 71 FR 5604, Feb. 2, 2006; T.D. TTB-196, 89 FR 87943, Nov. 6, 2024]