New York Codes, Rules and Regulations
Title 2 - DEPARTMENT OF AUDIT AND CONTROL
Chapter VI - New York State and Local Employees' Retirement System and New York State and Local Police and Fire Retirement System
Part 347 - Prepayment Of Amortized Contributions By Participating Employers Pursuant To Sections 17-a And 317-a Of The Retirement And Social Security Law
Section 347.3 - Payment of outstanding amortization

On or before each November 15th thereafter, in addition to the amount due for the current year billing and for the payment of the annual amortized installment, the Comptroller shall advise each participating employer of amortization amount still outstanding and be authorized to accept the prepayment of any balance remaining to be paid by December 15th of that year, including interest.