Do vehicles over 6,000 pounds get a full write-off?

Where the claim comes from

Vehicles rated over 6,000 pounds gross vehicle weight are not "passenger automobiles" under IRC §280F(d)(5), so the annual depreciation caps for cars do not apply. Marketing turned that rule into "buy a big SUV and write it all off." The weight rule is real, but it is only one of several conditions.

The claim also overlooks what happens when the vehicle is sold. Depreciation reduces your basis, so a sale or trade-in after a large first-year deduction usually produces a gain taxed as ordinary income under IRC §1245 to the extent of the depreciation taken. The deduction moves tax to later years; it does not make the cost disappear.

What the law actually says

IRC §280F(d)(5)(A) defines a passenger automobile as a four-wheeled vehicle made primarily for public roads and rated at 6,000 pounds unloaded gross vehicle weight or less (gross vehicle weight for trucks and vans). Heavier vehicles escape the §280F(a) dollar caps, but they remain listed property. Under IRC §280F(b)(1), if listed property is not used more than 50% in a qualified business use, depreciation must be computed under the alternative depreciation system of IRC §168(g). That means no §179 expensing and no bonus depreciation.

IRC §179(b)(5) limits the cost of a sport utility vehicle that can be expensed under §179 to $25,000, indexed for inflation; Rev. Proc. 2025-32 sets the 2026 figure at $32,000. Some vehicles are excluded from the SUV definition, such as those seating more than nine behind the driver, those with an open cargo bed at least six feet long, and certain cargo vans. P.L. 119-21 restored a permanent 100% bonus depreciation deduction under IRC §168(k) for qualified property acquired after January 19, 2025 (Notice 2026-11). Section 179 is also limited to taxable income from the active conduct of a trade or business under IRC §179(b)(3).

The §179 deduction for all property is limited to $2,560,000 for 2026 and phases out dollar for dollar when total qualifying purchases exceed $4,090,000, under the amounts in Rev. Proc. 2025-32. Most small businesses are far below those limits, so the SUV cap and the business-income limit are usually the constraints that matter.

What is true and what is not

It is true that a heavy vehicle used mostly for business can produce a first-year deduction equal to its business-use cost. It is not true that weight alone does it. The vehicle has to be used more than 50% for business, commuting does not count as business use, and you need a mileage log under IRC §274(d).

It is also not true that falling short of 50% leaves you with nothing. The business share is still depreciated, just slowly: straight line over five years under the alternative depreciation system.

It is also not true that the 6,000-pound rule applies to every heavy vehicle in the same way. A pickup with a six-foot bed or a cargo van without seating behind the driver can fall outside the SUV cap entirely, while a large three-row SUV is subject to it. The exact vehicle matters.

• True: vehicles over 6,000 pounds GVWR avoid the passenger-car depreciation caps.
• True: 100% bonus depreciation can apply to the business share in 2026.
• Not true: personal and commuting miles can be written off.
• Not true: the deduction is automatic without a contemporaneous mileage log.

What to do instead

Before you buy, confirm the gross vehicle weight rating on the door-jamb label, estimate honest business mileage, and model the deduction at that percentage. Keep a contemporaneous log of date, destination, business purpose, and miles. Watch the business-use percentage in later years, because dropping to 50% or less triggers recapture under IRC §280F(b)(2).

Compare the purchase with the standard mileage rate and with leasing. The largest first-year deduction does not always produce the lowest total tax over the years you own the vehicle.

If you use the vehicle for both business and personal driving, record the total miles at the start and end of each year along with each business trip. A reconstructed log prepared after an audit letter arrives is given far less weight than one kept as you go.

How ebotCPA helps

We model the vehicle deduction at your documented business-use percentage, compare §179, bonus depreciation, and the standard mileage rate, and set up a mileage log that meets §274(d).

Book a $497 Case Analysis to have Ebot Mbi, CPA, EA review your facts before you act.

Primary sources

1. 26 U.S.C. §179(b)(5). Limitation for sport utility vehicles.

   Caps the cost of an SUV that can be expensed under §179 at an inflation-indexed $25,000 and defines the vehicles excluded from the cap.

2. 26 U.S.C. §280F(b)(1) and (d)(5). Listed property and passenger automobile definition.

   “If any listed property is not predominantly used in a qualified business use for any taxable year, the deduction allowed under section 168 with respect to such property for such taxable year and any subsequent taxable year shall be determined under section 168(g)”

   Requires alternative depreciation for vehicles used 50% or less for business and defines passenger automobiles by the 6,000-pound rating.

3. 26 U.S.C. §168(k). Special depreciation allowance.

   Provides the additional first-year depreciation deduction that P.L. 119-21 made 100% for property acquired after January 19, 2025.

4. 26 U.S.C. §274(d). Substantiation of listed property.

   Requires adequate records of business use for listed property, including vehicles.

5. Rev. Proc. 2025-32, §179(b)(5)(A) adjustment. 2026 SUV §179 limit.

   Sets the 2026 §179 limit for sport utility vehicles at $32,000 and the general §179 limit at $2,560,000.

6. Notice 2026-11. Interim guidance on additional first-year depreciation.

   Provides interim rules for the 100% additional first-year depreciation deduction under the OBBBA for property acquired after January 19, 2025.

Frequently asked questions