See New York Form IT-203-F at this link and the Instructions for Form IT-203-F at this link. According to the instructions:
Form IT-203-F, Multi-Year Allocation Form, must be filed if you:
- as a nonresident received certain income related to a profession or occupation previously carried on both within New York State and outside New York State (for example, termination agreement or covenant not to compete). Do not use this form if you received income from a termination agreement or covenant not to compete, and you were not an employee of the payor. See TSB-M-10(9)I, Income Received by a Nonresident Related to a Business, Trade, Profession, or Occupation Previously Carried on Within New York State, for how to determine the amount of New York source income.
or
- have compensation from stock options, restricted stock, or stock appreciation rights as a nonresident (including a part-year resident if compensation is recognized during your nonresident period) that must be allocated to New York, and – performed services both in and out of New York State for the grantor during the grant to vest period of such options, stock, or rights and – have an allocation period that is different than the period of time that applies to the regular, non-stock-based remuneration from the grantor during the tax year.
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