Which ever period is applicable, 26 U.S.C. 7425 and this section shall govern the amount to be paid and the procedure to be followed.
For purposes of this section, a purchaser who acquires title as a result of a nonjudicial foreclosure sale is treated as the holder of the lien being foreclosed if a lien (or any interest reserved, created, or conveyed as security for the payment of a debt or fulfillment of other obligation) held by the purchaser is partially or fully satisfied by reason of the foreclosure sale. For example, a person whose title is derived from a tax deed issued under local law shall be treated as a purchaser who is the holder of the lien foreclosed in a case where a tax certificate, evidencing a lien on the property arising from the payment of property taxes, ripens into title. The amount paid by a purchaser at the sale includes deferred payments upon any portion of the bid price which is in excess of the amount of the lien being foreclosed. The actual amount paid does not include costs and expenses incurred prior to the foreclosure sale by the purchaser except to the extent such expenses are included in the amount of the lien being foreclosed which is legally satisfied by reason of the sale or in the amount bid and paid at the sale. Where the lien being foreclosed attaches to other property not subject to the foreclosure sale, the amount legally satisfied by reason of the sale does not include the amount of such lien that attaches to the other property. However, for purposes of the preceding sentences, the amount of the lien that attaches to the other property shall be considered to be equal to the amount by which the value of the other property exceeds the amount of any other senior lien on that property. Where, after the sale, the holder of the lien being foreclosed has the right to the unpaid balance of the amount due the holder, the amount legally satisfied by reason of the sale does not include the amount of such lien to the extent a deficiency judgment may be obtained therefor. However, for purposes of the preceding sentence, an amount, with respect to which the holder of the lien being foreclosed would otherwise have a right to a deficiency judgment, shall be considered to be legally satisfied by reason of the foreclosure sale to the extent that the holder has waived the holder's right to a deficiency judgment prior to the foreclosure sale. For this purpose, the waiver must be in writing and legally binding upon the foreclosing lienholder as of the time the sale is concluded. If, prior to the foreclosure, payments have been made by the foreclosing lienholder to a holder of a superior lien, the payments are included in the actual amount paid to the extent they give rise to an interest which is legally satisfied by reason of the foreclosure sale.
Upon a showing of reasonable cause, an appropriate TTB officer may, in that official's discretion and at any time before the expiration of the applicable period for redemption, grant an extension for a reasonable period of time to submit, amend, or supplement a request for reimbursement. Unless a request for reimbursement is timely submitted (determined with regard to any extension of time granted), no amount shall be payable to the purchaser or the purchaser's successor in interest on account of a payment made to a senior lienor if the right to redeem under 26 U.S.C. 7425(d) is exercised. A waiver or other document submitted pursuant to paragraph (b)(4)(ii) of this section shall be treated as effective only to the extent of the amount included in the redemption price under this paragraph. If the right to redeem is not exercised or a request for reimbursement is withdrawn, the appropriate TTB officer shall, by certified or registered mail or hand delivery, return to the purchaser or the purchaser's successor any waiver or other document submitted pursuant to paragraph (b)(4)(ii) of this section as soon as is practicable.
27 C.F.R. §70.206
26 U.S.C. 7425(d)