N.Y. GCT Law § 51

§ 51. Requirement of withholding tax from wages.--(a) General.--On or\nafter the first payroll period beginning forty-five days after the date\nthis local law becomes effective, every employer maintaining an office\nor transacting business within this state and making payment of any\nwages taxable under this local law shall deduct and withhold from such\nwages for each payroll period a tax computed in such manner as to\nresult, so far as practicable, in withholding from the employee's wages\nduring each calendar year an amount substantially equivalent to the tax\nreasonably estimated to be due under this local law resulting from the\ninclusion in the employee's city adjusted gross income of his wages\nreceived during such calendar year. The method of determining the amount\nto be withheld shall be prescribed by regulations of the administrator\nwith due regard to the city withholding exemptions of the employee and\nthe sum of any credits allowable against his tax. This section shall not\napply to payments by the United States for service in the armed forces\nof the United States.\n (b) Withholding exemptions.--For purposes of this section:\n (1) An employee shall be entitled to the same number of city\nwithholding exemptions as the number of withholding exemptions to which\nhe is entitled for federal income tax withholding purposes. An employer\nmay rely upon the number of federal withholding exemptions claimed by\nthe employee, except where the employee claims a different number of\ncity withholding exemptions.\n (2) The amount of each city exemption shall be six hundred dollars.\n