Unloaded weight is the limb that reaches a light truck
New York runs a weight-distance tax, and its definition of the vehicles it reaches is the provision on this page most likely to surprise an operator who has checked one number and stopped.
The tax is the Highway Use Tax, imposed under N.Y. Tax Law Article 21. The department of transportation describes it plainly: New York imposes a truck mileage tax on motor carriers operating certain motor vehicles on state public highways; it is not imposed on the portions of the Thruway for which a toll is charged; and it is “a weight-distance tax, computed based on mileage traveled by a motor vehicles on New York State public highways at a rate determined by the weight of the vehicle”. §503(a) imposes it and §502(1)(a) requires a certificate of registration for each motor vehicle.
The reach is set by N.Y. Tax Law §501(2)(a), verbatim: “‘Motor vehicle’ shall include any automobile, truck, tractor or other self-propelled device, having a gross weight in excess of eighteen thousand pounds, or any truck having an unloaded weight in excess of eight thousand pounds, or any tractor, having an unloaded weight in excess of four thousand pounds, which is used upon the public highways otherwise than upon fixed rails or tracks.”
Three limbs, joined by “or”, and only the first is a loaded-weight test. A truck weighing eight thousand and one pounds with nothing on it is inside the definition regardless of what it grosses. A tractor weighing four thousand and one pounds empty is inside it. The eighteen-thousand-pound gross limb is the one everybody quotes, and it is the limb least likely to be the one that catches a small combination.
The statute supplies its own measuring rules, which is why the distinction is not merely semantic. Gross weight means the unloaded weight of the motor vehicle plus the unloaded weight of the heaviest drawn device, plus the maximum load, excluding the driver and helper. Unloaded weight means the actual weight of the vehicle including all equipment necessary for its function as a vehicle, necessary for its safety, permanently attached to it, used exclusively to protect the load, or used exclusively for loading or unloading. Equipment bolted on for load protection counts toward the empty figure.
There is a fourth reach for automotive fuel carriers. The second paragraph of §501(2)(a) adds, for the purposes of §502, any trailer, semi-trailer, dolly or other drawn device having a gross weight, alone or in combination, in excess of eighteen thousand pounds. That limb reaches equipment that is not self-propelled at all.
- Gross weight in excess of 18,000 lb — the limb everybody quotes.
- A truck with unloaded weight in excess of 8,000 lb — no loaded figure appears in this limb.
- A tractor with unloaded weight in excess of 4,000 lb — likewise.
- Automotive fuel carriers only: a trailer or other drawn device over 18,000 lb gross, alone or in combination.
- Unloaded weight includes permanently attached equipment and load-protection equipment.
- All limbs read at §501(2)(a) on September 2, 2026.