In addition to any other taxes, now authorized by law, any city having a population of one million or more is hereby authorized and empowered to adopt and amend local laws imposing a tax on the personal income of residents of such city to be administered in the manner provided for in this article by the administrator as defined in section one of the model local law hereinafter set forth.
The tax authorized by this article may be imposed only if the general city law authorizes the adoption of a city tax on the earnings of nonresidents and the city imposing the tax herein authorized also imposes such tax on the earnings of nonresidents. The rates of such tax shall be the rates contained in either section three or three-A of the model local law and such rates may be reduced and increased, provided that the rates shall not be fixed higher than those contained in section three-A of such model local law.
The terms of such local law shall be substantially the same as the following model local law except that:
N.Y. Gen. City Law § 25-A