Taxable Gross Weight Explained: How to Find Your 2290 Category

The single number that determines your Heavy Vehicle Use Tax is the taxable gross weight. It is not your GVWR sticker, your scale ticket, or your registered weight alone — it's a three-part total defined by the IRS.

The three-part formula

Add those three numbers and you have your taxable gross weight. "Customarily" matters: it's about your normal operation, not a one-time heavy haul.

• The actual unloaded weight of the truck, fully equipped for service.
• The actual unloaded weight of any trailers or semi-trailers customarily used with it.
• The weight of the maximum load customarily carried on the truck and trailers.

Categories A through V

At 55,000 lbs you're in Category A and owe $100 for the year. Each additional 1,000 lbs moves you up one letter and adds $22, until Category V — anything over 75,000 lbs — caps the tax at $550. A typical five-axle tractor-trailer running at 80,000 lbs sits in Category V.

Logging vehicles pay 75% of these amounts, and vehicles expected to stay at or under 5,000 miles (7,500 for agricultural) are reported in Category W — suspended, owing $0 but still required to file.

Why getting the category right matters

Your category letter prints on your stamped Schedule 1, which state agencies check at registration. Under-reporting weight risks an amended return, extra tax, and registration friction later; over-reporting simply costs you money. If your maximum load changes during the year and pushes you into a higher category, the IRS requires an amended Form 2290 for the weight increase.