On receipt of permit to compute the tax on TTB Form 5100.21 the brewer shall compute and enter the amount of the tax on all copies of the form.

[T.D. 6695, 28 FR 12934, Dec. 5, 1963. Redesignated at 40 FR 16835, Apr. 15, 1975; T.D. TTB-146, 82 FR 1132, Jan. 4, 2017]