Reviewed by Anil Rajput, CPA · Last reviewed July 2026
Quick answer: Section 179 and bonus depreciation let you deduct the cost of your truck and equipment in the year you put it to work instead of spreading it over years. For 2026, Section 179 caps the deduction at $2.56 million with a phase-out starting at $4.09 million, and the One Big Beautiful Bill Act made 100% bonus depreciation permanent. For an owner-operator, the key point is that a Class 8 tractor is a heavy work vehicle well over 14,000 pounds, so it escapes the SUV cap and can be fully written off in year one.
This is general information, not tax advice. Depreciation choices interact with your income, your entity, and your state's rules, and a big first-year deduction is not always the best move. Model it with a CPA before you file.
What is depreciation, and why does it matter for a truck?
A truck is a business asset, not a simple expense. Normally you recover its cost over several years through depreciation. Section 179 and bonus depreciation are the two accelerators that let you take much or all of that cost up front, lowering the taxable profit in the year you buy. For how that profit flows into what you owe, see how much owner-operators pay in taxes.
What is the Section 179 deduction in 2026?
Section 179 lets a business expense the full cost of qualifying equipment placed in service during the year, rather than depreciating it. For 2026 the maximum deduction is $2.56 million, and it begins to phase out dollar for dollar once total qualifying purchases pass $4.09 million. Those ceilings are far above anything a single-truck operator will reach, so for most owner-operators the cap is not the constraint. The vehicle rules are.
What is bonus depreciation, and what changed?
Bonus depreciation is a separate first-year allowance. Under the Tax Cuts and Jobs Act it was scheduled to phase down to 40% in 2025 and disappear by 2027. The One Big Beautiful Bill Act, signed in July 2025, reversed that and made 100% bonus depreciation permanent for qualifying property placed in service after January 19, 2025. Unlike Section 179, bonus depreciation has no annual dollar cap and can create a loss.
Can an owner-operator write off a truck in one year?
Usually yes, for the tractor. The famous SUV cap, $32,000 for 2026, applies only to sport utility vehicles rated between 6,001 and 14,000 pounds. A Class 8 tractor is rated far above 14,000 pounds and is a work vehicle, not a passenger SUV, so that cap does not apply. Combined with permanent 100% bonus depreciation, a qualifying tractor used entirely for business can be fully expensed in year one.
Business use matters. The vehicle must be used more than 50% for business, and your deduction is limited to the business-use percentage. A tractor used 100% for the business is fully deductible; personal use reduces it proportionally, and mileage logs are your evidence.
Should you take the full deduction? The honest tradeoff
A 100% first-year write-off feels like a win, but it is not always the smartest one. Deducting the whole truck now means you have no depreciation left to offset income in future years, when your rate might be higher or your income larger. If this year's profit is modest, spreading the deduction can save more tax overall. And a deduction only helps if you have profit to offset. This is a planning decision, not a reflex, which is exactly why it belongs in a conversation with your CPA rather than a quick election at filing time.
Section 179 and bonus depreciation for 2026 at a glance
- Section 179 max deduction; 2026: $2.56 million; Note: phase-out starts at $4.09 million
- Bonus depreciation; 2026: 100%, permanent; Note: no annual dollar cap, can create a loss
- Heavy SUV cap (6,001 to 14,000 lbs); 2026: $32,000; Note: does not apply to a Class 8 tractor
- Class 8 tractor (over 14,000 lbs); 2026: fully expensable; Note: subject to business-use percentage
- Passenger auto (under 6,000 lbs); 2026: about $20,400 first year; Note: luxury-auto limit applies
Frequently asked questions
For a Class 8 tractor used entirely for business, generally yes. It is a heavy work vehicle over 14,000 pounds, so the $32,000 SUV cap does not apply, and permanent 100% bonus depreciation lets you expense the full cost in year one. Your deduction is reduced by any personal-use percentage.
The maximum Section 179 deduction for 2026 is $2.56 million, phasing out once total qualifying purchases exceed $4.09 million. For a single-truck owner-operator those ceilings are not a practical limit. The vehicle-specific rules matter far more than the overall cap.
Section 179 has an annual dollar cap and cannot create a loss, so it is limited to your business income. Bonus depreciation has no dollar cap and can create a loss. Section 179 is elected first, then bonus depreciation applies to the remaining cost. For a single truck, either can often fully expense it.
The $32,000 heavy-SUV cap applies to sport utility vehicles between 6,001 and 14,000 pounds, not to a semi tractor. A Class 8 tractor is well above 14,000 pounds and is a work vehicle, so it is not capped by that rule and can be fully expensed with bonus depreciation.
No. A full first-year deduction removes depreciation you could have used against higher income later, and a deduction only helps if you have profit to offset. In a low-profit year, spreading the deduction can save more over time. Run the numbers with a CPA before electing a full write-off.
Yes. The vehicle must be used more than 50% for business, and your deduction is limited to the business-use percentage. Mileage logs and records are your evidence. For a tractor used only for the business this is straightforward, but any personal use must be tracked and will reduce the deduction.
Time your truck deduction around real numbers
Whether to expense your truck now or spread it depends on this year's profit and next year's outlook, and you cannot judge that from a bank balance. Ace Global gives owner-operators and small fleets a dedicated bookkeeper backed by CPAs who tracks your equipment, your business-use percentage, and your real profit, so the depreciation decision is a calculation instead of a guess. Flat pricing, no long-term contracts, answers on WhatsApp or iMessage. Get started with Ace Global today.
Related reading
- How much do owner-operators pay in taxes?
- How much does trucking bookkeeping cost per month?
- How to start a trucking company
Sources
- IRS - About Publication 946, How To Depreciate Property
- IRS - About Form 4562, Depreciation and Amortization
This article is for informational purposes only and does not constitute tax or accounting advice. Depreciation limits, bonus percentages, and vehicle caps change and interact with your income, entity, and state rules. Consult a qualified professional before making a depreciation election.