27 CFR 25.166: Payment of reduced rate of tax.

(a) By return, Form 5000.24. A brewer who is eligible to pay the reduced rate of tax on beer may, upon filing the notice required by § 25.167, pay the reduced rate of tax on beer by return for deferred payment of tax as provided in § 25.164 or by prepayment return as provided in § 25.175. Payment of reduced rate of tax on beer by return, Form 5000.24, may commence with any tax return filed during a calendar year and will continue until the brewer has taxpaid 60,000 barrels of beer at the lower rate of tax, or taxpaid the number of barrels of beer apportioned under § 25.167(b)(3) for that calendar year.

(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.