A Section 179 work truck is a truck your trade buys and expenses in the year it starts work, instead of depreciating it over several years. For 2026 the federal limit is $2,560,000, so the dollar cap is not what stops most trades. What stops them is three rules: the truck must be placed in service by December 31, it must be used more than 50% for business, and if it is an SUV between 6,000 and 14,000 pounds the Section 179 amount is capped at $32,000. A pickup with a bed of 6 feet or longer is outside that cap. And none of it holds up without a mileage record kept as you go.
In short
- Section 179 limit for 2026: $2,560,000, reduced dollar for dollar once purchases pass $4,090,000 (IRS, Rev. Proc. 2025-32).
- Sport utility vehicles rated 6,001 to 14,000 pounds GVWR: Section 179 capped at $32,000 for 2026; a cargo bed of 6 feet or more is exempt from that cap (IRS, Pub. 946).
- Business use must be more than 50% in the first year, and falls below that later trigger recapture (IRS, Pub. 946).
- Property acquired and placed in service after January 19, 2025 takes a 100% special depreciation allowance unless you elect out (IRS, Pub. 946).
Why the dealer's Section 179 page is not enough
Search "section 179 truck deduction" and most of what ranks is written by truck dealers and equipment lenders. Some of it still quotes the old limits: $1,250,000 or $1,160,000 instead of 2026's $2,560,000. More important, it stops at "buy before December 31." It rarely tells you what the IRS will ask for if the return is examined.
Publication 946 is direct: "You cannot take any depreciation or section 179 deduction for the use of listed property unless you can prove your business/investment use with adequate records." That means the amount of each expense, the amount of business use and total use for the year (miles, for a vehicle), the date, and the business purpose. You do not need a daily log, but the record has to be made "at or near the time." A spreadsheet rebuilt from memory in March is the record most likely to fail.
For a plumber, an electrician or an HVAC company, the truck is the most personal piece of equipment the business owns. It goes home at night. It goes to the hardware store on Saturday. That is exactly why the business-use percentage is the number that gets questioned.
The 2026 numbers that apply to a work truck
| Rule | 2026 figure | Source |
|---|---|---|
| Section 179 limit | $2,560,000 | Rev. Proc. 2025-32 |
| Phase-out starts at total purchases of | $4,090,000 | Rev. Proc. 2025-32 |
| SUV cap (over 6,000, up to 14,000 lb GVWR) | $32,000 | Rev. Proc. 2025-32 |
| Minimum business use, first year | more than 50% | Pub. 946 |
| Special depreciation allowance | 100% | Pub. 946 |
The business income limit also applies. Publication 946 says the total cost you can deduct under Section 179, after the dollar limit, "is limited to the taxable income from the active conduct of any trade or business during the year." Anything over that carries forward to the next year. The 100% special allowance is a separate deduction with its own rules, and Notice 2026-11 sets out the IRS's interim guidance on it. Which one your return uses is a decision for your tax preparer, made with the full year's numbers.
How to claim Section 179 on a work truck without trouble
- Check the gross vehicle weight rating before you buy. It is printed on the certification label in the driver's door jamb. Over 6,000 pounds and under 14,000, ask whether the vehicle counts as a sport utility vehicle or falls under one of the exceptions in Publication 946: a cargo area at least 6 feet long inside that is not reachable from the cab, seating for more than nine behind the driver, or a cab-over body with no seat behind the driver.
- Get it into service before December 31. Publication 946: property is placed in service "when it is ready and available for a specific use." A truck at the upfitter, or waiting for a ladder rack and shelving, may not be ready. Write down the date it went to its first job.
- Record the odometer on day one. Then record it again on December 31. Total miles for the year is half of the business-use calculation.
- Log business trips as they happen. Date, job address or customer, purpose, miles. A dispatch system, a job management app or a notebook on the dash all work, as long as the entry is made at or near the time.
- Work out the business-use percentage honestly. Publication 946's own example: an $11,000 item used 80% for business has a business cost of $8,800. On a $70,000 truck at 85% business use, the business cost is $59,500, and that is the figure Section 179 works from.
- Decide the method with your preparer before filing. Section 179, the 100% special allowance, or standard mileage. Publication 946 notes that using the standard mileage rate is treated as electing to exclude the vehicle from MACRS depreciation, so choosing it closes the door on expensing the truck.
- Keep the records for the whole recovery period. Recapture can happen "in any tax year of the recovery period," the publication says, so the records have to last that long too.
The mistake most owners make at step 5
They assume 100% business use because the truck has the company name on the door. Publication 946 says "the use of an automobile for commuting is not business use, regardless of whether work is performed during the trip," and the Saturday run for groceries is not business use either. If the honest figure is 70%, deduct on 70%. The bigger risk is the later year: if business use drops to 50% or less in any year of the recovery period, Publication 946 says you include the recapture amount as ordinary income on Form 4797. A truck that becomes the family vehicle in year three can hand back part of the deduction it earned in year one.
Where this fits
We build back office systems for service businesses that capture incoming documents into the job record: fuel and repair receipts photographed and filed, mileage logged against the job it served. We do not prepare tax returns or tell you which deduction to take; that is your preparer's call. For the other year-end paperwork, see the 1099-NEC threshold change for 2026 and what goes in W-2 box 12 code TT, and more for owners is on our services page.
Check the door jamb, get the truck working before New Year's Eve, and start the log on the first day it rolls.
