refundable credit The amount of the credit which would (but for this paragraph) be allowable under subsection (a) shall be reduced (but not below zero) by the aggregate refunds and credits made or allowed to the taxpayer (or, except as otherwise provided by the Secretary, any dependent of the taxpayer) under subsection (f). Any failure to so reduce the credit shall be treated as arising out of a mathematical or clerical error and assessed according to section 6213(b)(1). (2) Joint returns Except as otherwise provided by the Secretary, in the case of a refund or credit made or allowed under subsection (f) with respect to a joint return, half of such refund or credit shall be treated as having been made or allowed to each individual filing such return. (f) Advance refunds and credits (1) In general Subject to paragraphs (5) and (6), each individual who was an eligible individual for such individual’s first taxable year beginning in 2020 shall be treated as having made a payment against the tax imposed by chapter 1 for such taxable year in an amount equal to the advance refund amount for such taxable year. (2) Advance refund amount (A) In general For purposes of paragraph (1), the advance refund amount is the amount that would have been allowed as a credit under this section for such taxable year if this section (other than subsection (e) and this subsection) had applied to such taxable year. (B) Treatment of deceased individuals For purposes of determining the advance refund amount with respect to such taxable year— (i) any individual who was deceased before January 1, 2022, shall be treated for purposes of applying subsection (e)(2) in the same manner as if the valid identification number of such person was not included on the return of tax for such taxable year (except that subparagraph (E) thereof shall not apply), (ii) notwithstanding clause (i), in the case of a joint return with respect to which only spouse is deceased before January 1, 2022, such deceased spouse was a member of the Armed Forces of the