27 CFR 24.69: Filing of claims.

(a) Claims. All claims filed under this part for abatement, refund, credit, or remission of tax will be filed on TTB F 5620.8 (2635). Each claim filed under this part will:

(1) Show the name, address, and title of the claimant;

(2) Be signed by the claimant or the duly authorized agent of the claimant; and

(3) Be executed under the penalties of perjury.

(b) Supporting documents. Forms, supporting statements, and any other documents required by this part to be submitted with a claim will be attached to the claim and be considered a part of the claim. The appropriate TTB officer may require the submission of additional evidence in support of any claim filed under this part.