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.
Related resources
More Form 2290 and HVUT guides
- Form 2290 Amendments: How to Add Trucks, Increase Taxable Weight, and Report Exceeded Mileage
- How to Slide Tandems and Balance Commercial Truck Axle Weights: Federal Bridge Formula, Kingpin Rules, and CAT Scale Guide
- IRS Form 2290 Heavy Vehicle Use Tax (HVUT) Online Filings: Complete Guide
- Hotshot Trucking Startup Guide: Equipment Selection, CDL vs Non-CDL, Regulations, and Profitability
- State Mileage Highway Use Taxes Guide: NY HUT, Kentucky KYU, NM WDT, and Oregon Weight-Mile
- Amended 2290 Returns: Weight Increases and Blown Mileage Limits
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e-File Form 2290 Now →This post is general information for motor carriers, not tax or legal advice, and government rules, systems, and fees can change at any time. Confirm anything before you rely on it with the IRS, the FMCSA, or a qualified professional. Consulics does not guarantee its accuracy or currency and accepts no liability for information an agency later changes.