N.Y. Comp. Codes R. & Regs. tit. 20, § 3-7.5
A taxpayer that claims a capital loss carry back or carry forward must submit a copy of its Federal schedule of capital gains and losses for the loss year and for any year or years to which the loss is being carried. A claim for refund based on a capital loss carry back must be filed on the forms and in the manner prescribed by the commissioner.