26 CFR 303.1-7 - Claims for refund or credit.
(a) Claims for refund or credit must be filed within the period prescribed by section 6511 of the Internal Revenue Code of 1954 as modified by section 36(c) of the Trading With the Enemy Act. Any such claim must contain a detailed statement under the penalties of perjury of all the facts relied upon in support of the claim and should be filed with the district director for the district in which the tax was paid. See paragraph (f)(1) of § 303.1-4, relating to final computation.
(b) Any act of the Attorney General for, or on behalf of, a taxpayer in respect of any claim under this part will be considered as the act of such taxpayer, unless such taxpayer notifies the Commissioner of Internal Revenue in writing, by the filing of a claim for refund or credit or otherwise, that he does not ratify such act. See paragraph (b) of § 303.1-4, relating to relationship of Attorney General and former owner.