N.Y. YTS Law § 15-129

§ 15-129. Report of change in taxable income.\n If the amount of a taxpayer's federal or New York State taxable income\nor self-employment income reported on his/her federal or New York State\nTax return for any taxable year is changed or corrected by the United\nStates Internal Revenue Service or the New York State Tax Commission or\nother competent authority, or as the result of a renegotiation of a\ncontract or subcontract with the United States or New York State or if a\ntaxpayer, pursuant to Subsection (d) of Section 6213 of the Internal\nRevenue Code, executing a notice of waiver of the restrictions provided\nin Subsection (a) of said section, or if a taxpayer, pursuant to § 681,\nSubdivision (f), of the New York State Tax Law executes a notice of\nwaiver of the restrictions provided in Subdivision (c) of said section,\nor if any tax on self-employment income in addition to that shown on\nhis/her return is assessed, the taxpayer shall report such change or\ncorrection in federal or New York State taxable income or such execution\nof such notice of waiver or such assessment and the changes or\ncorrections of his/her federal or New York State taxable income or\nself-employment income on which it is based, within ninety (90) days\nafter the final determination of such change, correction or\nrenegotiation or such execution of such notice of waiver or the making\nof such assessment as otherwise required by the State Tax Commission and\nshall concede the accuracy of such determination or state wherein it is\nerroneous. Any taxpayer filing an amended federal or New York State\nincome or self-employment income tax return shall also file within\nninety (90) days thereafter an amended return under this article and\nshall give such information as the State Tax Commission may require. The\nState Tax Commission may, by regulation, prescribe such exceptions to\nthe requirements of this section as it deems appropriate.\n