under subsection (b)(2) unless the valid identification number of such dependent is included on the return of tax for the taxable year. (D) Valid identification number (i) In general For purposes of this paragraph, the term valid identification number means a social security number issued to an individual by the Social Security Administration on or before the due date for filing the return for the taxable year. (ii) Adoption taxpayer identification number For purposes of subparagraph (C), in the case of a dependent who is adopted or placed for adoption, the term valid identification number shall include the adoption taxpayer identification number of such dependent. (E) Special rule for members of the armed forces Subparagraph (B) shall not apply in the case where at least 1 spouse was a member of the Armed Forces of the United States at any time during the taxable year and the valid identification number of at least 1 spouse is included on the return of tax for the taxable year. (F) Coordination with certain advance payments In the case of any payment determined pursuant to subsection (f)(6), a valid identification number shall be treated for purposes of this paragraph as included on the taxpayer’s return of tax if such valid identification number is available to the Secretary as described in such subsection. (G) Mathematical or clerical error authority Any omission of a correct valid identification number required under this paragraph shall be treated as a mathematical or clerical error for purposes of applying section 6213(g)(2) to such omission. (3) Credit treated as refundable The credit allowed by subsection (a) shall be treated as allowed by subpart C of part IV of subchapter A of chapter 1. (e) Coordination with advance refunds of credit (1) Reduction of 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