If—

(A) an individual is or was entitled to a benefit subject to reduction under paragraph (1) or (3) of this subsection, and

(B) such benefit is increased by reason of an increase in the primary insurance amount of the individual on whose wages and self-employment income such benefit is based,

then the amount of the reduction of such benefit (after the application of any adjustment under paragraph (7)) for each month beginning with the month of such increase in the primary insurance amount shall be computed under paragraph (1) or (3), whichever applies, as though the increased primary insurance amount had been in effect for and after the month for which the individual first became entitled to such monthly benefit reduced under such paragraph (1) or (3).