Such rate shall be computed each year by means of an actuarial valuation as prescribed in section three hundred eleven of this article and as authorized by section three hundred 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 § 323