N.Y.C. Admin. Code § 11-804: § 11-804 Presumption and burden of proof.

For the purpose of the proper administration of this chapter and to prevent evasion of the tax hereby imposed, it shall be presumed that all motor vehicles used in the city of the types described in paragraphs (a), (b) and (c) of subdivision three of section 11-801 of this chapter are used principally in the city or used principally in connection with a business carried on within the city and are subject to the tax until the contrary is established; and it shall be presumed that all motor vehicles used in the city of the types described in paragraphs (a) and (b) of subdivision four of section 11-801 of this chapter are used regularly, even though not principally in the city and are subject to the tax until the contrary is established. The burden of proving that a motor vehicle is not taxable under this chapter shall be on the owner of the motor vehicle.