If you buy a work truck for your business in 2026, you can generally deduct the full purchase price in the same year you put it into service, provided the truck’s Gross Vehicle Weight Rating is above 6,000 pounds and you use it more than half the time for business. The work truck tax write-off combines two tools: the Section 179 expense election, capped at $2,560,000 for 2026, and 100 percent bonus depreciation, which was permanently restored by the One Big Beautiful Bill Act for property acquired after January 19, 2025.1Internal Revenue Service. One, Big, Beautiful Bill Provisions How much you actually deduct depends on the truck’s weight, your business-use percentage, and which depreciation method you elect.
One boundary first: if you’re a W-2 employee who uses a truck for your job, none of this applies to you. The Tax Cuts and Jobs Act eliminated the unreimbursed employee business expense deduction, and the One Big Beautiful Bill Act made that elimination permanent. Your only route to recovering vehicle costs is through your employer’s reimbursement or accountable plan. Everything below assumes you’re a sole proprietor, partner, S corp or C corp shareholder, or single-member LLC owner reporting business income.
Weight Is What Decides the Size of Your Deduction
The single most important number on your truck is its GVWR, which you’ll find on the manufacturer’s certification label on the driver’s side door jamb (not the window sticker). The tax code treats vehicles very differently on either side of two weight lines.
6,000 Pounds or Less: Sharp Annual Caps
Lighter trucks and most midsize pickups are treated as “passenger automobiles,” which caps how much depreciation you can claim each year regardless of what the truck cost. For a truck placed in service in 2026 with bonus depreciation applied, the caps are $20,300 in year one, $19,800 in year two, $11,900 in year three, and $7,160 in each year after.2Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles Without bonus depreciation, the year-one cap drops to $12,300. A $45,000 midsize pickup under 6,000 pounds takes roughly four years to fully deduct even with bonus depreciation. That is why the weight threshold matters so much.
6,001 to 14,000 Pounds: The Sweet Spot for Full-Size Pickups
Cross 6,000 pounds and the passenger automobile caps disappear. Most full-size pickups (Ford F-250, Chevrolet Silverado 2500, RAM 2500) sit in this range, along with many large SUVs. A qualifying pickup or work van in this range can be fully expensed under the general Section 179 limit and stacked with bonus depreciation.
SUVs in this weight band are treated differently: Section 179 is capped at $31,300 for 2026. The good news is that anything above the cap can still be written off through 100 percent bonus depreciation. On a $75,000 heavy SUV used entirely for business, you’d take $31,300 under Section 179 and the remaining $43,700 as bonus depreciation, wiping out the full purchase price in year one.
The SUV cap does not apply to vehicles designed for work rather than passenger use. A truck qualifies as a non-SUV when it has no seating behind the driver, or a fully enclosed cargo area at least six feet long, or no body section extending more than 30 inches ahead of the windshield. Those trucks and vans get the general Section 179 treatment.
Over 14,000 Pounds: No Vehicle-Specific Caps
Vehicles above 14,000 pounds GVWR aren’t passenger automobiles at all and face no SUV-specific cap. This covers Class 4 and heavier commercial trucks, certain F-450 and F-550 configurations, and most box trucks. A $90,000 heavy-duty work truck used entirely for business is fully deductible in year one under Section 179 alone, with room to spare under the $2,560,000 limit.
How Section 179 Works
Section 179 lets you treat the purchase price as a current-year expense instead of depreciating it over five or six years.3Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets For 2026, the maximum deduction is $2,560,000, and the phaseout doesn’t start until total qualifying equipment purchases pass $4,090,000, so the ceiling is effectively unlimited for anyone buying one or two trucks.
Section 179 has one real limitation you need to plan around: it can’t exceed your taxable business income for the year. If your business is showing a small profit or a loss, the deduction is capped there. Unused amounts carry forward to future years, so nothing is lost, but the immediate benefit shrinks.
How Bonus Depreciation Works With It
Bonus depreciation kicks in after Section 179 and picks up whatever’s left. For any truck acquired after January 19, 2025, the rate is 100 percent, so the entire remaining basis comes off in year one.4Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
Bonus depreciation has no dollar ceiling and, critically, no taxable income limitation. It can create or deepen a net operating loss that you carry forward. If your business had a rough year but you still need the truck, bonus depreciation is the tool that keeps the deduction from being trapped by low income.
The 50 Percent Business Use Rule
Every deduction on this page is proportional to business use. Drive the truck 80 percent for business and you deduct 80 percent of the qualifying costs. Drive it 60 percent for business and you get 60 percent.
There’s a hard floor beneath that: the truck must be used more than 50 percent for business to qualify for Section 179 or bonus depreciation at all. Slip to 50 percent or below and you lose access to both accelerated methods entirely, leaving only straight-line depreciation over a longer recovery period. This threshold applies every year during the recovery period, not just the year of purchase, which sets up the recapture problem discussed below.
Deducting Fuel, Maintenance, and Other Operating Costs
The purchase deduction is only part of the picture. You also deduct the cost of running the truck, and you pick one of two methods. Your first-year choice generally locks you in for that vehicle.
Standard Mileage Rate
Multiply business miles by the IRS rate, which is 72.5 cents per mile for 2026.5Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile Twenty thousand business miles is a $14,500 deduction with minimal paperwork.
There’s a catch that surprises most people: you cannot use the standard mileage rate on a truck for which you claimed Section 179 or bonus depreciation. Those elections permanently disqualify the vehicle from the mileage method.6Internal Revenue Service. Topic No. 510, Business Use of Car If you’re taking the big upfront write-off (and most work truck buyers will), the mileage rate is off the table for that truck.
Actual Expense Method
Track every dollar you spend on the truck and deduct the business-use percentage of each cost: fuel, oil changes and maintenance, tires, insurance, registration fees, loan interest, tolls, and parking. This is the method you’ll use if you claimed Section 179 or bonus depreciation. It takes more record-keeping but usually produces a larger deduction for a truck with real operating costs. Spending $800 a month on fuel and repairs with 90 percent business use yields $8,640 a year in operating deductions on top of the purchase write-off.
Records You Need to Keep
Vehicle deductions get audited often enough that thin records are a real risk. Three things need documentation.
First, a contemporaneous mileage log. Each entry needs the date, destination, business purpose, starting and ending odometer readings, and miles driven.7Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses “Contemporaneous” is the operative word: a log built from memory at tax time won’t hold up. GPS-based tracking apps are accepted as long as they capture the required fields, and a few dollars a month is cheap insurance against a $60,000 first-year deduction being disallowed.
Second, expense documentation. If you’re using the actual expense method, keep receipts or invoices showing the date, amount, and description of every cost.8Internal Revenue Service. What Kind of Records Should I Keep Digital copies are fine.
Third, purchase documentation. Keep the bill of sale, financing agreement, and proof of the truck’s GVWR to substantiate what you report on Form 4562.9Internal Revenue Service. About Form 4562, Depreciation and Amortization A photo of the GVWR label on the door jamb is enough. If you’re claiming that the truck clears 6,000 pounds, have that proof ready now rather than hunting for it during an audit years later.
When the IRS Takes Some of the Deduction Back
The upfront write-off isn’t permanent in every scenario. Two situations trigger recapture.
The first is a drop in business use. If business use falls to 50 percent or less in any year during the five-year recovery period, you have to recapture the excess depreciation. That means adding income back to your return equal to the difference between what you actually deducted and what you would have been allowed under the slower straight-line alternative depreciation system.10Internal Revenue Service. Publication 946 (2025), How To Depreciate Property The recaptured amount goes on Form 4797 and is taxed as ordinary income. On a $70,000 first-year deduction, that can produce a painful bill in year three if usage has shifted toward personal driving.
The second is a sale or trade-in. When you sell a truck you’ve depreciated, gain up to the amount of your prior depreciation is taxed as ordinary income under Section 1245, not as capital gain. Buy for $80,000, deduct the full amount, sell later for $35,000: the $35,000 is ordinary income. The deduction is a timing benefit, not a permanent one. Knowing that in advance lets you plan the replacement cycle without a surprise tax hit.