N.Y. GCT Law § 39

§ 39. Report of change in federal taxable income.--If the amount of a\ntaxpayer's federal taxable income reported on his federal income tax\nreturn for any taxable year is changed or corrected by the United States\ninternal revenue service or other competent authority, or as the result\nof a renegotiation of a contract or subcontract with the United States\nor if a taxpayer, pursuant to subsection (d) of section six thousand two\nhundred thirteen of the internal revenue code, executes a notice of\nwaiver of the restrictions provided in subsection (a) of said section,\nthe taxpayer shall report such change or correction in federal taxable\nincome or such execution of such notice of waiver and the changes or\ncorrections of his federal taxable income on which it is based, within\nninety days after the final determination of such change, correction, or\nrenegotiation, or such execution of such notice of waiver or as\notherwise required by the administrator, and shall concede the accuracy\nof such determination or state wherein it is erroneous. Any taxpayer\nfiling an amended federal income tax return shall also file within\nninety days thereafter an amended return under this local law, and shall\ngive such information as the administrator may require. The\nadministrator may by regulation prescribe such exceptions to the\nrequirements of this section as he deems appropriate.\n