2026 Truck and SUV Write-Off Rules for Contractors

Episode 107 of the Construction Accounting Podcast with George Ghazarian, CPA · 5 min 22 sec · Published 28 February 2026

You are standing at the dealership with financing paperwork in front of you, and the salesman is telling you the truck is a full write-off. Sometimes he is right. Often he is not, and the difference is weight, business use and paperwork.

Here are the 2026 numbers that decide it, and the order to make the decision in.

Bonus Depreciation Is Back at 100 Percent

Under the One Big Beautiful Bill, the IRS released guidance confirming permanent 100% additional first-year depreciation for qualified property acquired after Jan. 19, 2025. For a contractor buying a truck, that means a qualifying vehicle structured the right way can produce a very large first-year deduction.

Vehicles carry extra layers of rules on top of that. Passenger vehicle luxury auto caps under Section 280F, the listed property rules, and business-use substantiation all sit between you and the deduction. So 100% bonus does not mean everyone writes off everything.

The 6,000-Pound Line That Decides Everything

This is where contractors win or lose the deduction, and it has nothing to do with the badge on the tailgate. It is gross vehicle weight rating.

Vehicles under 6,000 lbs GVWR, where most lighter pickups and SUVs land, can get hit with the luxury auto depreciation caps under Section 280F. The IRS updates those caps annually in a revenue procedure, so the cap that applies to you depends on the year your vehicle is placed in service. If your truck is under 6,000 lbs, you may be capped even though bonus depreciation is 100%.

Over 6,000 lbs GVWR is the contractor sweet spot. Many heavy-duty trucks and some SUVs qualify, which puts Section 179 on the table within its limits, along with potential 100% bonus depreciation depending on the vehicle category and the facts.

The Section 179 Numbers for 2026

For tax years beginning in 2026:

• Section 179 maximum: $2,560,000
• Section 179 phase-out begins: $4,090,000
• SUV cap under Section 179, 6,000 to 14,000 lbs: $32,000

That SUV cap is the line contractors ask about most, and it is the one most often misread. It does not mean $32,000 is the most you can deduct on the vehicle. It means the Section 179 piece is capped at $32,000 for that SUV category. From there you look to bonus depreciation or MACRS on the remaining basis, depending on the vehicle rules and your facts.

Mileage or Actual Expenses

If you use the mileage method, the IRS business standard mileage rate for 2026 changed mid-year: 72.5 cents per mile from 1 January through 30 June, and 76 cents from 1 July onward under Announcement 2026-11. If you drive across both halves, you track and apply them separately.

Mileage tends to work for lighter vehicles, lower-cost vehicles, and any situation where you would rather have simplicity than a depreciation schedule. Understand before you file that once you choose a method there are locking rules, particularly for leased vehicles and for first-year decisions.

When Leasing Beats Buying

Leasing can outperform buying when:

• your vehicle would be capped under Section 280F
• you rotate vehicles frequently
• you want smoother deductions and less depreciation math

Buying can outperform leasing when:

• you qualify for the heavier vehicle strategies
• you want equity and a long hold period
• your income is high and you want the acceleration

Neither one always wins. The mistake is making the call at the dealership with a finance manager waiting on you. Run the numbers first.

Business Use Is the Number One Audit Trigger

Contractors get hammered here. The deduction follows the percentage. Use the vehicle 80% for business and you deduct 80%. At 51% business you are playing with fire unless your logs are clean.

Back the percentage up with a mileage tracking app, your calendar and job site history, and fuel receipts tied to odometer readings. Note the floor everyone forgets: Section 179 and bonus depreciation require more than 50 percent business use, and if use drops below that in a later year you face recapture. If you cannot prove it, it can get reclassified.

Depreciation Recapture Is the Bill Nobody Plans For

If you take big depreciation deductions and later sell the vehicle, you may have to report taxable income on the gain up to the depreciation you took, depending on the facts. That is one reason some contractors prefer leasing: it can reduce that surprise.

The sequence matters more than the truck. Do the strategy first, then buy.

The short version

• Bonus depreciation is 100% for qualified property acquired after Jan. 19, 2025
• Section 179 maxes at $2,560,000 for tax years beginning in 2026
• The Section 179 phase-out begins at $4,090,000 in 2026
• Section 179 on an SUV of 6,000 to 14,000 lbs caps at $32,000
• The 2026 standard business mileage rate is 72.5 cents per mile
• Vehicles under 6,000 lbs GVWR can still hit the Section 280F caps

Related episodes

• What Work Clothing Contractors Can Actually Deduct
• Failed Acquisition Costs and What Contractors Can Deduct

Browse the full Construction Accounting Podcast archive

This episode is general information about how these rules work, not advice for your situation. Tax law changes and the right answer depends on your entity, your income and your circumstances. Talk to a CPA before acting on it.