26 CFR 48.6416(a)-1: (a)-1 Claims for credit or refund of overpayments of taxes on special fuels and manufacturers taxes.

Any claims for credit or refund of an overpayment of a tax imposed by chapter 31 or chapter 32 shall be made in accordance with the applicable provisions of this subpart and the applicable provisions of § 301.6402-2 of this chapter (Regulations on Procedure and Administration). A claim on Form 843 is not required in the case of a claim for credit, but the amount of the credit shall be claimed by entering that amount as a credit on a return of tax under this subpart filed by the person making the claim. In this regard, see § 48.6416(f)-1.