Two numbers define this year. First, the Section 179 expensing limit for 2026 is $2,560,000, with a phase-out that only starts once you place more than $4,090,000 of equipment in service — irrelevant thresholds for an owner-operator with one to five trucks, which means Section 179 covers your entire purchase. Second, the One Big Beautiful Bill Act (enacted July 4, 2025) made 100% bonus depreciation permanent for qualified property acquired and placed in service after January 19, 2025 — the IRS confirmed the mechanics in Notice 2026-11. The old phase-down schedule (80% in 2023, 60% in 2024) is gone.
Both tools apply to new and used trucks (used must be new to you, not bought from a spouse, parent or your own company). And no, the $32,000 "SUV cap" does not touch you — it applies to vehicles of 6,001–14,000 lbs GVWR, and a Class 8 tractor is far above that. So in 2026 the question is not "can I write the whole truck off in year one?" — you almost always can. The question is whether you should.
If you do nothing special, MACRS spreads the deduction. The classes surprise people — a tractor depreciates faster than a trailer (IRS Pub 946, Appendix B):
| Asset | MACRS class | Write-off by year (half-year convention) |
|---|---|---|
| Over-the-road tractor unit (asset class 00.26) | 3-year property | 33.33% / 44.45% / 14.81% / 7.41% |
| Trailer, trailer-mounted container (00.27) | 5-year property | 20% / 32% / 19.2% / 11.52% / 11.52% / 5.76% |
| Heavy general purpose truck (00.242) | 5-year property | same 5-year schedule |
Notice what plain MACRS already gives you on a tractor: a third of the cost in year one, over three-quarters in two years — front-loaded, but with deductions left for the years when your revenue is actually higher.
| Feature | Section 179 | 100% bonus | Plain MACRS |
|---|---|---|---|
| Year-1 deduction | Any amount you choose, up to full cost | All or nothing — 100% | 33.33% (tractor) / 20% (trailer) |
| Flexibility | Per asset, per dollar — expense $40K of an $80K truck if you want | Election out applies to the whole property class for the year | Automatic |
| Income limit | Cannot exceed business taxable income (excess carries forward) | None — can create a loss (NOL) | None |
| Business use drops to 50% or less | Recapture of the excess deduction | Recapture rules for listed property | Switch to straight-line |
| State treatment | Many states allow (some with lower caps) | CA / NY / NJ / IL require addback | Generally follows |
The planning gold is in row two: Section 179 is a scalpel, bonus is a sledgehammer. With 179 you can expense exactly $47,000 of an $80,000 tractor — enough to zero out your 22%-bracket income but not waste deductions against the 12% bracket — and let MACRS carry the rest into next year. Electing out of bonus, by contrast, is done by property class: opt out for one 3-year asset and you have opted out for every 3-year asset you placed in service that year.
Here is the part the guy who sold you the truck never mentioned. Depreciation is not free money — it is a loan from the IRS secured by your truck's basis. Under IRC §1245, when you sell, gain up to the total depreciation you claimed comes back as ordinary income (up to 37% federal), reported on Form 4797. Worked example:
| Step | Numbers | Tax result |
|---|---|---|
| 2023: buy used tractor | $80,000, expensed 100% via Section 179 | Deduction saved ~$30K (income tax + 15.3% SE tax) |
| Adjusted basis after write-off | $0 | Every future sale dollar is gain |
| 2026: sell tractor | $50,000 | Gain = $50,000 − $0 = $50,000 |
| Recapture test | Gain ($50K) ≤ depreciation taken ($80K) | All $50,000 = ordinary income, Form 4797 |
| Federal bill at 22–24% | ≈ $11,000–$12,000 | Plus state income tax on top |
Three details that matter. One: recapture is not subject to self-employment tax — Form 4797 gain never touches Schedule C, so the 15.3% you saved on the way in does not come back. Two: if you somehow sell above original cost, only the slice above $80,000 gets capital-gain treatment. Three: since 2018 there is no like-kind exchange for equipment — a dealer trade-in is a taxable sale at the trade-in value, not a tax-free swap. Plan the exit before you shake hands; our guide on selling your semi covers the paperwork side.
Section 179 is elected asset by asset, amount by amount on Form 4562 — truck #1 fully expensed, truck #2 on MACRS, trailer at 50%: all legal in the same return. Bonus depreciation applies automatically unless you elect out by property class: declining it for one tractor means declining it for all 3-year property placed in service that year, while your 5-year trailers can still take it. Growing fleets stagger purchases across tax years partly for this reason — each year is a fresh set of elections. And the classic exit move: sell and replace in the same tax year, so the 100% write-off on the replacement absorbs the recapture income from the old truck. It works — but understand it is a treadmill: the deferred tax comes due the year you leave the industry without replacing. If you are still choosing how to acquire the next truck, weigh this against leasing vs buying — lease payments deduct evenly with no recapture at the end.
Bring these five questions to a CPA who actually works with trucking: (1) What bracket am I in this year, and what bracket do I realistically hit next year? (2) How much Section 179 — in dollars, not "max it" — fits this year? (3) What does my state do with bonus depreciation? (4) What is my exit-year plan for each truck — replace, or cash out and eat the recapture? (5) Does any financing, mortgage or immigration filing in the next 24 months depend on my reported income? A preparer who answers "we always take everything year one" is doing data entry, not planning. Pair the depreciation decision with a Solo 401(k) — retirement contributions are the deduction you can dial up in the good years when the truck has nothing left to give.
At TruckerNavi we are not CPAs and do not file tax returns — we set up trucking companies (Authority Bundle, $499) and keep them compliant, and we see every month what a year-one "write it all off" decision does to year-three financing. We will gladly tell you, in Russian, English or Ukrainian, which questions to take to your tax professional before you sign for the truck.
Call (315) 871-0833 — starting a trucking company? We will walk you through the setup decisions that follow you for years$2,560,000, phasing out dollar-for-dollar above $4,090,000 of equipment placed in service (gone at $6,650,000). One or two trucks never touch the phase-out.
Yes — permanent under the One Big Beautiful Bill Act for property acquired and placed in service after January 19, 2025 (IRS Notice 2026-11). New and used both qualify.
Over-the-road tractors: 3-year MACRS property (33.33%/44.45%/14.81%/7.41%). Trailers and heavy trucks: 5-year property (Pub 946, Appendix B).
Under §1245, sale gain up to the depreciation you took is taxed as ordinary income (up to 37%), on Form 4797 — not at capital-gain rates.
With $0 basis the whole sale price is ordinary income: $80K truck expensed, sold at $50K → $50K taxable, roughly $11–12K federal at 22–24% plus state.
Low-income years, before income-underwritten financing, and before an I-864 immigration sponsorship — the affidavit uses 1040 total income with no add-backs.
CA, NY, NJ and IL require an addback and re-depreciate over the regular schedule, so federal and state basis diverge until the truck is sold.
No — Form 4797 gain is not SE income. The write-off saved income tax plus 15.3% SE; recapture only brings the income tax back.