(A) If the first month for which an individual both is entitled to a wife’s, husband’s, widow’s, or widower’s insurance benefit and has attained age 62 (in the case of a wife’s or husband’s insurance benefit) or age 50 (in the case of a widow’s or widower’s insurance benefit) is a month for which such individual is also entitled to— (i) an old-age insurance benefit (to which such individual was first entitled for a month before he attains retirement age (as defined in section 416( l ) of this title)), or (ii) a disability insurance benefit, then in lieu of any reduction under paragraph (1) (but subject to the succeeding paragraphs of this subsection) such wife’s, husband’s, widow’s, or widower’s insurance benefit for each month shall be reduced as provided in subparagraph (B), (C), or (D).

(B) For any month for which such individual is entitled to an old-age insurance benefit and is not entitled to a disability insurance benefit, such individual’s wife’s or husband’s insurance benefit shall be reduced by the sum of— (i) the amount by which such old-age insurance benefit is reduced under paragraph (1) for such month, and (ii) the amount by which such wife’s or husband’s insurance benefit would be reduced under paragraph (1) for such month if it were equal to the excess of such wife’s or husband’s insurance benefit (before reduction under this subsection) over such old-age insurance benefit (before reduction under this subsection).

(C) For any month for which such individual is entitled to a disability insurance benefit, such individual’s wife’s, husband’s, widow’s, or widower’s insurance benefit shall be reduced by the sum of— (i) the amount by which such disability insurance benefit is reduced under paragraph (2) for such month (if such paragraph applied to such benefit), and (ii) the amount by which such wife’s, husband’s, widow’s, or widower’s insurance benefit would be reduced under paragraph (1) for such month if it were equal to the excess of such wife’s, husband’s, widow’s, or widower’s insurance benefit (before reduction under this subsection) over such disability insurance benefit (before reduction under this subsection).

(D) For any month for which such individual is entitled neither to an old-age insurance benefit nor to a disability insurance benefit, such individual’s wife’s, husband’s, widow’s, or widower’s insurance benefit shall be reduced by the amount by which it would be reduced under paragraph (1).

(E) Notwithstanding subparagraph (A) of this paragraph, if the first month for which an individual is entitled to a widow’s or widower’s insurance benefit is a month for which such individual is also entitled to an old-age insurance benefit to which such individual was first entitled for that month or for a month before she or he became entitled to a widow’s or widower’s benefit, the reduction in such widow’s or widower’s insurance benefit shall be determined under paragraph (1).