applicable exempt amount
(4) (A) For purposes of this section, and except as provided in subparagraph (B), the “earnings” and the “applicable exempt amount” of an individual shall be determined in a manner consistent with applicable provisions of section 203 of the Social Security Act. (B) For purposes of this section— (i) in determining the excess earnings of any individual, only earnings attributable to periods during which such individual was entitled to an annuity supplement under section 8421 shall be considered; and (ii) any earnings attributable to a period before attaining the applicable retirement age under section 8412(h) shall not be considered in determining the excess earnings of an individual who retires under section 8412(d)(1) or (e), or section 8414(c).