Where can I obtain information about New York State corporation taxes?

 You can find information about New York State corporation taxes on the Corporation 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/