N.Y. Comp. Codes R. & Regs. tit. 20, § 654.2
(a) In addition to the application for refund, the following information and documentation must be submitted when claiming a refund:
(b) Where the basis for a refund claim is the mortgagor's exercise of the statutory right of rescission, in addition to the information and documentation described in paragraphs(a)(1) and (2) of this section, there must be submitted:
Tax Law, §§ 257-a, 263