Where can I obtain information about the New York State withholding tax?

 You can find information about New York State withholding tax on the Withholding Tax Index page within the New York State Department of Taxation and Finance Web site.

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Department of Tax & Finance: Business Taxpayer Page
The New York State Department of Taxation and Finance Web site provides a portal which contains detailed information pertaining to the State's business taxes.
URL: http://www.tax.ny.gov/bus/