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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

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Your 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

  1. Start with the actual unloaded weight of the fully equipped truck (ready to drive, fuel and equipment included).
  2. Add the unloaded weight of any trailers or semi-trailers customarily used with it.
  3. Add the weight of the maximum load customarily carried on the truck and those trailers.
  4. The 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 for tax year accuracy: July 30, 2026Category: Getting Started
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.
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