Such rate shall be computed each year by means of an actuarial valuation as prescribed in section eleven of this article and as authorized by section twenty-three-a of this title.
Notwithstanding the above, for employers who commence participation in the retirement system on or after April first, nineteen hundred ninety-nine, the accrued liability shall be amortized in equal annual installments over a twenty-five year period. With respect to such employers the cost of making such initial valuation shall be assessed against and paid by the employer. The provisions of subdivisions c, d and e of this section shall not apply to employers who commence participation in the retirement system on or after April first, nineteen hundred ninety-nine.
N.Y. Retire. and Soc. Sec. Law § 23