N.Y. Comp. Codes R. & Regs. tit. 9, § 156.6 – Performance advance payments.

(a) Employees who complete one year of service in full-time employment status at a basic annual salary rate which is below the job rate of their salary grade, whose performance at the completion of such year of service is rated other than unsatisfactory or an equivalent rating, or higher, shall be eligible to receive a performance advance.
1. (1) For the purpose of determining the date upon which one year of service is completed, any pay period for which the employee was on leave without pay or leave with less than full pay for the full payroll period will not be counted.
2. (2) Performance advances will be payable to eligible employees effective the first day of the payroll period following the completion of the required period of service.
(b) Employees with one year of service in grade as of March 31, 1985 and who are otherwise eligible to receive a performance advance shall receive a performance advance equal to one fourth of the range between the hiring rate and the job rate for their grade.
(c) Employees who are eligible to receive a performance advance payable on and after June 13, 1985 shall receive a performance advance equal to one fifth of the range between the hiring rate and the job rate for their grade.
(d) Each employee who receives a performance advance to the job rate of his/her salary grade between March 31, 1985 and June 13, 1986 as established in subdivision (a) of this section, shall receive a one-time, nonrecurring lump-sum payment equal to the dollar value of the difference between the partial performance advance received by the employee and the full performance advance received by the employee and the full performance advance for the employee's grade as of the date of the employee's performance advance in accordance with the provisions of subdivision (a) of this section. Such one-time, nonrecurring lump-sum payment shall be paid as soon as practicable after the effective date of the employee's performance advance.
(e) In no case may a performance advance result in a basic annual salary above the job rate for the employee's position. Only that portion of the performance advance which would bring the employee's salary up to the job rate shall be paid.
(f) In no case shall an employee receive an additional performance advance within one year of having received a performance advance pursuant to these rules or Parts 147 through 158 of this Title. This provision shall not apply to increases resulting from recomputed promotion salaries made pursuant to such rules.
(g) Eligible part-time employees shall be paid on a prorated basis depending on the fractional equivalent of the time worked during each payroll period.