26 CFR § 302.1-7 - Claims for credit or refund.
(a) Time for filing claims. Claims for credit or refund must be filed within the period prescribed by section 322 of the Internal Revenue Code of 1939 or by section 6511 of the Internal Revenue Code of 1954, as modified by section 212(c) of the Act. Any such claim must contain a detailed statement under penalties of perjury of all the facts relied upon in support of the claim and should be filed with the district director of the district in which the tax was paid. See paragraph (f)(1) of § 302.1-4 relating to final computation.
(b) Attorney General acting for taxpayer. Any act of the Attorney General for, or on behalf of, a taxpayer in respect of any claim under the regulations in this part will be considered as the act of such taxpayer, unless such taxpayer notifies the Commissioner 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 § 302.1-4 relating to relationship of Attorney General and former owner.