Section 179 Vehicle Tax Estimator

GVWR vs. Curb Weight

Business owners frequently make a massive mistake when trying to use the Section 179 vehicle tax loophole: they look at the curb weight instead of the Gross Vehicle Weight Rating (GVWR).

The IRS heavy SUV list is entirely based on GVWR, which is the maximum loaded weight of the vehicle (including passengers and cargo). A Porsche Macan might look heavy, but its GVWR is under 6,000 lbs, making it a "Light Vehicle" subject to strict depreciation caps (around $20,300 total in Year 1). However, stepping up to the Porsche Cayenne pushes the GVWR over 6,000 lbs, unlocking massive tax write-offs for luxury SUVs.

The 2026 SUV Cap vs. Trucks

In 2026, the tax code treats Heavy SUVs differently than Heavy Trucks.

• Heavy SUVs (6k - 14k lbs): The IRS places a cap on the initial Section 179 deduction at $32,000. However, you can then apply 100% Bonus Depreciation to the remaining purchase price, effectively allowing you to write off the entire cost of the vehicle in year one!
• Heavy Trucks (6k+ lbs, 6ft Bed): Vehicles like a Ford F-150 with a full-size bed are considered heavy cargo vehicles. They are exempt from the $32,000 SUV cap entirely, allowing you to take the full purchase price as a direct Section 179 deduction.

The 50% Rule Warning

To claim any Section 179 or Bonus Depreciation deduction, you must use the vehicle more than 50% for business. If your business use ever drops below 50% in subsequent years, you will be subject to "depreciation recapture," meaning you will have to pay back some of those tax savings. Always maintain a meticulous mileage log.