Tax Law, § 1139(f)
The amount refunded to the consumer, whether the vehicle is purchased or leased, may be reduced to reflect the extent of use of the vehicle by the consumer.
Section 198-b of the General Business Law (the Used Car Lemon Law) requires that if, after a reasonable period of time, the dealer or its agent fails to correct a malfunction or defect as required by the warranty which substantially impairs the value of the used motor vehicle to the consumer, the dealer shall accept the return of the used motor vehicle from the consumer and refund to the consumer the full purchase price, or in the case of a lease contract all payments made under the contract, including sales and compensating use tax, less a reasonable allowance for any damage not attributable to normal wear or usage, and adjustment for any modifications which either increase or decrease the market value of the vehicle or of the lease contract, and in the case of a lease contract, shall cancel all further payments due from the consumer under the lease contract. The vendor is also entitled to a refund or credit of any sales or compensating use tax refunded to the consumer for the return of the defective motor vehicle in accordance with and provided the vendor meets the conditions stated in section 534.6(a)(2) of this Part.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 534.9