Tax Law, § 1309; Administrative Code of the City of New York, § 11-1771
Method I-Wage Bracket Table Method
Method II-Exact Calculation Method
In case of special situations, however, an employer may apply to the Commissioner of Taxation and Finance for permission to use another method. The wage bracket table method and the exact calculation method are set out in Appendix 10-C of this Title and are also obtainable in booklet form from the Taxpayer Assistance Bureau of the New York State Department of Taxation and Finance, or from any New York State district tax office. Instructions for withholding, payment and reporting of the New York City personal income tax on residents are also available in booklet form.
The provisions of section 171.4(b) of this Title with respect to the withholding of New York State personal income tax on supplemental wages shall also be applicable to the withholding of New York City personal income tax on residents, except with regard to the rate prescribed in such section. For New York City personal income tax on residents withholding purposes, an employer may withhold from the supplemental wages at a rate equal to 4.25 percent.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 291.1