(A) Notwithstanding paragraphs (1) and (2), any nonrecurring income which is paid to an individual in the first month of any period of eligibility shall be taken into account in determining the amount of the benefit under this subchapter of such individual (and his eligible spouse, if any) only for that month, and shall not be taken into account in determining the amount of the benefit for any other month.

(B) For purposes of subparagraph (A), payments to an individual in varying amounts from the same or similar source for the same or similar purpose shall not be considered to be nonrecurring income.