(b) Credit for reduction. The plan sponsor shall credit the account of an employer that satisfies the requirements of
§ 4208.4(c)(1) or (c)(2) with the amount of annual withdrawal liability that it paid in excess of the amount described in paragraph (a)(1) or (a)(2) of this section, as appropriate. The credit shall be applied, a revised payment schedule issued, refund made and interest added, all in accordance with
§ 4208.3(c)(4).