Tax Law, § 1115(a)(14)
The sale of a motor vehicle by the owner to his or her spouse, parent or child is exempt from sales or use tax; however, this exemption shall not apply if the vendor is a dealer.
Example 1:
A husband and wife each own a motor vehicle. They exchange cars as the husband intends to trade in his wife's car for a new one. The exchange of cars between husband and wife is for a consideration (car for car) and is not a gift. A sales tax would ordinarily be due on both vehicles, but as it is an exchange between a husband and wife the exemption applies.
Example 2:
A parent purchases an automobile, for his child's use; title is in the parent's name. A year later, the child assumes payment of the note, and title is transferred to him. A sales tax would ordinarily be due on the transfer of a car in exchange for the assumption of liabilities; but as this is a transaction between a parent and a child, the exemption applies.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 528.15