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How to Determine Your Truck's Taxable Gross Weight
Written by the Consulics HVUT Compliance Team · Reviewed against the IRS Instructions for Form 2290
Need your stamped Schedule 1 today? You can e-file Form 2290 with Consulics in minutes.
e-File Form 2290 NowYour Form 2290 tax is set by taxable gross weight, so getting this number right matters. It is not just the weight of the truck — it includes the trailers you normally pull and the load you normally carry.
How to calculate it
- 1Start with the actual unloaded weight of the fully equipped truck (ready to drive, fuel and equipment included).
- 2Add the unloaded weight of any trailers or semi-trailers customarily used with it.
- 3Add the weight of the maximum load customarily carried on the truck and those trailers.
- 4The total is your taxable gross weight; match it to the IRS weight category (A through V) to find the tax.
Where to find the numbers
Check the manufacturer's weight rating, the registration, or the door-jamb sticker for the unloaded weights, then add your typical maximum load. If you are unsure which category that lands in, the weight category finder does the lookup for you.
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Last reviewed July 30, 2026
This page is general information, not tax, legal, or financial advice. Rules, rates, and procedures change over time and may not fit your situation, so confirm anything you rely on with the IRS or the relevant agency, or with a qualified professional. Consulics does not guarantee this information is complete or current.