27 C.F.R. § 20.68
(a) Notice. When a permittee permanently discontinues business, a written notice shall be filed with the appropriate TTB officer to cover the discontinuance. The notice will be accompanied by the permit, and contain—
(b) Final Reports. The written notice required by this paragraph will also be accompanied by a report on Form 5150.18 covering the discontinuance and marked “Final Report.”
(Approved by the Office of Management and Budget under control number 1513-0061)
[T.D. ATF-199, 50 FR 9162, Mar. 6, 1985, as amended at T.D. ATF-476, 67 FR 17939, Apr. 12, 2002; T.D. TTB-140 81 FR 59456, Aug. 30, 2016]