For purposes of this subsection, an increase in the benefit amount payable under subchapter II (over the amount payable in the preceding month, or, at the election of the Commissioner of Social Security, the second preceding month) to an individual receiving benefits under this subchapter shall be included in the income used to determine the benefit under this subchapter of such individual for any month which is—

(A) the first month in which the benefit amount payable to such individual under this title is increased pursuant to section 1382f of this title , or

(B) at the election of the Commissioner of Social Security, the month immediately following such month.