Sec. 14A. CONTRIBUTION INCREASES. (a) If at any time a qualified actuary that meets the requirements of Subdivision (1), Subsection (b), Section 10A of this Act, determines that the total contribution rate, expressed as a percentage of wages, is insufficient to amortize the unfunded actuarial accrued liability, as defined under the Governmental Accounting Standards Board Statement No. 25, over a 40-year period:

(1) the city's or town's governing body may increase the city or town contribution rate; and

(2) to the extent that the city or town contribution rate increases under Subdivision (1) of this subsection, the member contribution rate must increase by an amount equal to the member contribution rate before the increase multiplied by a fraction:

(A) the numerator of which is the increase in the amount of the city or town contribution rate; and

(B) the denominator of which is the amount of the city or town contribution rate before the increase.

(b) The sum of the city or town contribution rate and the member contribution rate after an increase under this section may not exceed the total contribution rate determined by the qualified actuary to be necessary to amortize the unfunded actuarial accrued liability over a forty (40) year period.