Tax Law, § 504, subd. 3
Example 1:
A farmer owns and operates a motor vehicle in which he hauls his own farm produce. In addition thereto he also carries milk to a dairy from farms not contiguous to his own. These two types of operations are performed during the entire year. The motor vehicle is not exempt. A permit and plate must be obtained for it and its entire mileage is taxable.
Example 2:
A farmer leases from another a motor vehicle for use in hauling his farm produce to a canning factory. The motor vehicle is not exempt.
Example 3:
A farmer owns and operates a truck which he uses exclusively to haul his own farm produce. The truck is exempt from the statute. On August 15 he enters into a contract with a canning factory to transport products to it from farms not contiguous to his own during the period from August 15 to September 15. The use of the truck for this purpose destroys its exemption. A permit and plate must be obtained for it. Its entire mileage for the months of August and September is subject to tax. After the termination of the contract if the truck is again used exclusively to transport the farmer's own produce it is again exempt.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 471.5