(A) If— (i) with respect to any calendar year the “applicable increase percentage” was determined under clause (ii) of paragraph (1)(C) rather than under clause (i) of such paragraph, and the increase becoming effective under paragraph (2) in such year was accordingly determined on the basis of the wage increase percentage rather than the CPI increase percentage (or there was no such increase becoming effective under paragraph (2) in that year because there was no wage increase percentage greater than zero), and (ii) for any subsequent calendar year in which an increase under paragraph (2) becomes effective the OASDI fund ratio is greater than 32.0 percent, then each of the amounts described in subdivisions (I), (II), and (III) of paragraph (2)(A)(ii), as increased under paragraph (2) effective with the month of December in such subsequent calendar year, shall be further increased (effective with such month) by an additional percentage, which shall be determined under subparagraph (B) and shall apply as provided in subparagraph (C). Any amount so increased that is not a multiple of $0.10 shall be decreased to the next lower multiple of $0.10.

(B) The applicable additional percentage by which the amounts described in subdivisions (I), (II), and (III) of paragraph (2)(A)(ii) are to be further increased under subparagraph (A) in the subsequent calendar year involved shall be the amount derived by— (i) subtracting (I) the compounded percentage benefit increases that were actually paid under paragraph (2) and this paragraph from (II) the compounded percentage benefit increases that would have been paid if all increases under paragraph (2) had been made on the basis of the CPI increase percentage, (ii) dividing the difference by the sum of the compounded percentage in clause (i)(I) and 100 percent, and (iii) multiplying such quotient by 100 so as to yield such applicable additional percentage (which shall be rounded to the nearest one-tenth of 1 percent), with the compounded increases referred to in clause (i) being measured— (iv) in the case of amounts described in subdivision (I) of paragraph (2)(A)(ii), over the period beginning with the calendar year in which monthly benefits described in such subdivision were first increased on the basis of the wage increase percentage and ending with the year before such subsequent calendar year, and (v) in the case of amounts described in subdivisions (II) and (III) of paragraph (2)(A)(ii), over the period beginning with the calendar year in which the individual whose primary insurance amount is increased under such subdivision (II) became eligible (as defined in subsection (a)(3)(B)) for the old-age or disability insurance benefit that is being increased under this subsection, or died before becoming so eligible, and ending with the year before such subsequent calendar year; except that if the Commissioner of Social Security determines in any case that the application (in accordance with subparagraph (C)) of the additional percentage as computed under the preceding provisions of this subparagraph would cause the OASDI fund ratio to fall below 32.0 percent in the calendar year immediately following such subsequent year, the Commissioner shall reduce such applicable additional percentage to the extent necessary to ensure that the OASDI fund ratio will remain at or above 32.0 percent through the end of such following year.

(C) Any applicable additional percentage increase in an amount described in subdivision (I), (II), or (III) of paragraph (2)(A)(ii), made under this paragraph in any calendar year, shall thereafter be treated for all the purposes of this chapter as a part of the increase made in such amount under paragraph (2) for that year.