Reconciliation of credit with advance payments

(A) In general The amount of credit which would (but for this subsection) be allowed under this section shall be reduced (but not below zero) by the aggregate payment allowed to the taxpayer under paragraph (2). 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).

(B) Excess advance payments If the advance payments to a taxpayer under paragraph (2) for a calendar quarter exceed the credit allowed by this section (determined without regard to subparagraph (A)), the tax imposed under section 3111(b) or so much of the tax imposed under section 3221(a) as is attributable to the rate in effect under section 3111(b) (whichever is applicable) for the calendar quarter shall be increased by the amount of such excess.