27 C.F.R. § 25.152
(a) General. Section 5051(a)(2) of Title 26 U.S.C. provides for a reduced rate of tax on the first 60,000 barrels of beer removed for consumption or sale by a brewer during a calendar year. To be eligible to pay the reduced rate of tax, a brewer:
(3) May not be a member of a “controlled group” of brewers whose members together produce more than 2,000,000 barrels of beer per calendar year.
The appropriate TTB officer shall deny use of the reduced rate of tax provided by 26 U.S.C. 5051(a)(2) where it is determined that the allowance of such a reduced rate would benefit a person who would otherwise fail to qualify for use of such rate.
(b) Definitions. For the purpose of determining eligibility for payment of the reduced rate of tax on beer, terms have the following meanings:
(1) Controlled group. A related group of brewers as defined in 26 U.S.C. 5051(a)(2)(B). Controlled groups include, but are not limited to:
(iii) Combined groups as defined in 26 CFR 1.1563-1(a)(4). Stock ownership in a corporation need not be direct and 51% constructive ownership, defined in 26 CFR 1.1563-3, may be acquired through:
(d) Controlled groups of brewers. Members of a controlled group of brewers shall include the combined production of beer by all member brewers when determining eligibility under the 2,000,000 limitation. The reduced rate of tax applies to the first 60,000 barrels of beer removed for consumption or sale in a calendar year by the controlled group of brewers; the controlled group of brewers shall apportion the 60,000 barrels among member brewers in the manner described in each brewer's notice as provided by § 25.167(b)(3).
(Sec. 201, Pub. L. 85-859, 72 Stat. 1333, as amended (26 U.S.C. 5052))
[T.D. ATD-224, 51 FR 7673, Mar. 5, 1986, as amended by T.D. ATF-307, 55 FR 52738, Dec. 21, 1990; T.D. ATF-345, 58 FR 40357, July 28, 1993]