Refundability of excess credit
(A) Credit is refundable If the amount of the credit under subsection (a) exceeds the limitation of paragraph (3) for any calendar quarter, such excess shall be treated as an overpayment that shall be refunded under sections 6402(a) and 6413(b).
(B) Advancing credit In anticipation of the credit, including the refundable portion under subparagraph (A), the credit shall be advanced, according to forms and instructions provided by the Secretary, up to an amount calculated under subsection (a), subject to the limits under paragraph (1) and (2), all calculated through the end of the most recent payroll period in the quarter.