N.Y. Comp. Codes R. & Regs. tit. 20, § 151.6
(1) An individual who changes residence to or from New York State during the taxable year must file two New York State personal income tax returns—one for the period when such individual was a resident and the other for the period when such individual was a nonresident—if such individual meets any of the following conditions (unless otherwise provided for in paragraph [2] of this subdivision):
(i) such individual's New York adjusted gross income from all sources during the resident period plus such individual's New York adjusted gross income from New York State sources during the nonresident period equals or exceeds:
(2) Exception.
(i) If an individual changed residence during the taxable year, is subject to the New York State filing requirements provided in paragraph (1) of this subdivision, and in either the period before the change of residence or the period after the change of residence, such individual:
(c) was not subject to the separate tax on the ordinary income portion of a lump sum distribution; such individual is not required to file a New York State personal income tax return for the period during which such individual met all these conditions. In lieu of the New York State personal income tax return otherwise required to be filed for the period in which such individual met the conditions in this paragraph, such individual must attach a statement to, or indicate on, the New York State personal income tax return required to be filed, that, for the other period such individual:
(3) The provisions of paragraphs (1) and (2) of this subdivision also apply to an individual who is domiciled in New York State and who is a resident for part of a taxable year and who is considered a nonresident for the other part of the same taxable year in accordance with the provisions of section 605(a)(1)(B) of the Tax Law.
(b) Trusts.
If the status of a revocable inter vivos trust changes during its taxable year from resident to nonresident, or from nonresident to resident, the fiduciary of such trust must file one New York State fiduciary return as a resident trust for the portion of the year during which the trust is a resident trust, and one New York State fiduciary return as a nonresident trust for the portion of the year during which the trust is a nonresident trust. For a more detailed explanation concerning a change of resident status of a revocable inter vivos trust during its taxable year, see section 154.3 of this Title.
(a) Individual.