Tax form IT-201 is available on the website of the New York State Department of Taxation and Finance, as of 2015. Type "IT-201" in the Search Tax box to find the form and the instructions.
Click on the Resident Income Tax Return link to file your return online or to download the IT-201 tax form in PDF format. E-filing is faster, easier and more accurate than filing taxes by mail, according to the Department of Taxation and Finance. Every person who was a New York state resident for the whole of the previous year has to file a Form IT-201. Depending on an individual's situation, he may also have to file additional tax forms.