Accelerated depreciation for vehicles lets a business deduct most or all of a qualifying vehicle’s cost in the first year instead of spreading it across the standard five-year recovery period. For 2026, a vehicle with a gross vehicle weight rating above 6,000 pounds that’s used more than half for business can often be written off entirely in year one by combining Section 179 expensing with 100% bonus depreciation. A lighter passenger vehicle, no matter how expensive, is capped at $20,300 of first-year depreciation and recovers the rest over six or more years.
What Decides the Size of the Write-Off
Two facts about the vehicle control everything else: its gross vehicle weight rating and how much you drive it for business.
The gross vehicle weight rating (GVWR) is the manufacturer’s maximum loaded weight, printed on a sticker inside the driver’s door jamb. This number, not the curb weight, is what the IRS looks at. The threshold that matters is 6,000 pounds. Vehicles rated above 6,000 pounds escape the annual dollar caps that apply to passenger cars; many full-size SUVs, heavy-duty pickups, and cargo vans sit above that line. Vehicles at or below 6,000 pounds are “passenger automobiles” and face strict yearly limits regardless of what you paid.
Business use has to clear 50% in the year you place the vehicle in service, and only the business-use percentage of the cost is deductible.1Internal Revenue Service. Publication 946 – How To Depreciate Property A truck used 70% for business and 30% for personal errands produces a depreciable basis of 70% of its cost. The IRS expects a mileage log kept throughout the year, not reconstructed at tax time.
Section 179 Expensing
Section 179 lets you treat the cost of qualifying business property as an immediate expense instead of depreciating it over multiple years.2Office of the Law Revision Counsel. 26 USC 179 – Election To Expense Certain Depreciable Business Assets For vehicles specifically, the key number is the SUV cap. Heavy SUVs with a GVWR between 6,000 and 14,000 pounds are limited to a $32,000 Section 179 deduction in 2026. Congress put this cap in place so the full Section 179 limit couldn’t be used on vehicles that are essentially passenger cars that happen to be heavy. Any remaining cost basis above $32,000 can still be written off through bonus depreciation.
Section 179 carries an income limit the other methods don’t: the deduction cannot exceed your net taxable income from active businesses for the year. If your business earns $40,000 and you buy a $60,000 vehicle, Section 179 stops at $40,000. The disallowed amount carries forward indefinitely to future years with sufficient income.2Office of the Law Revision Counsel. 26 USC 179 – Election To Expense Certain Depreciable Business Assets
100% Bonus Depreciation
Bonus depreciation is a separate first-year deduction that stacks with Section 179. Under the One, Big, Beautiful Bill Act signed in 2025, 100% bonus depreciation is permanent for qualifying property acquired after January 19, 2025.3Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill Vehicles placed in service after that date qualify for the full 100% rate with no expiration.4Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
Unlike Section 179, bonus depreciation has no taxable income limit. It can create or deepen a net operating loss, which carries forward to offset up to 80% of taxable income in future years.5Internal Revenue Service. Tax Cuts and Jobs Act – A Comparison for Businesses NOLs arising after 2017 generally cannot be carried back.
Order matters when you combine the two methods. Section 179 is applied first; bonus depreciation then runs against whatever cost basis remains. For a heavy SUV, that means $32,000 under Section 179 followed by 100% bonus depreciation on the rest, which can zero out the purchase price in year one.
Caps for Lighter Passenger Vehicles
Vehicles at 6,000 pounds GVWR or less face annual dollar caps that override both Section 179 and bonus depreciation. The IRS calls these luxury auto limits, but they apply to every passenger vehicle regardless of price. For a vehicle placed in service in 2026 where bonus depreciation applies, the limits are:6Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles
- First year: $20,300
- Second year: $19,800
- Third year: $11,900
- Each year after: $7,160 until the cost is fully recovered
These numbers are ceilings for all depreciation combined. You can’t claim $20,300 of Section 179 and add bonus depreciation on top. If bonus depreciation doesn’t apply, the first-year cap drops to $12,300; the later-year numbers stay the same.6Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles
This is why the GVWR threshold is worth checking before you sign anything. A $75,000 sedan used 100% for business recovers $20,300 in year one and then grinds through the capped schedule. A $75,000 pickup over 6,000 pounds can potentially deduct the full $75,000 that same year.
A Worked Example
Say you buy a $68,000 SUV with a 7,200-pound GVWR in 2026 and use it entirely for business:
- Section 179 expenses the first $32,000. Remaining basis: $36,000.
- 100% bonus depreciation covers the remaining $36,000. Remaining basis: $0.
- Total first-year deduction: $68,000.
Spend the same $68,000 on a 4,500-pound sedan, also 100% business use, and the first-year deduction across all methods combined is $20,300. The remaining $47,700 comes out at $19,800 in year two, $11,900 in year three, and $7,160 each year after that.
If the heavy SUV were only 80% business use, you’d start with a depreciable basis of $54,400 (80% of $68,000). Section 179 would cover $32,000, and bonus depreciation would absorb the remaining $22,400, producing a $54,400 first-year deduction.
Leasing Changes the Rules
Depreciation only applies if you own the vehicle. Lease it and you deduct your lease payments as a business expense, proportional to business use. A $900 monthly payment at 75% business use yields a $675 monthly deduction.
Higher-value leased vehicles carry a “lease inclusion” amount, a small figure the IRS requires you to add back into income each year of the lease to prevent lessees from sidestepping the luxury auto caps. The 2026 tables are in Rev. Proc. 2026-15, and the amounts are modest relative to the lease cost.6Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles
Keeping the Deduction After You Claim It
A large first-year write-off creates obligations that run for years afterward. Three of them matter most.
Mileage Records
Vehicles are “listed property,” which means stricter documentation than most business assets.1Internal Revenue Service. Publication 946 – How To Depreciate Property You need a contemporaneous mileage log, meaning entries made close to the time of each trip rather than pieced together later. Record the date, destination, business purpose, and miles for each business trip. Business miles divided by total miles gives your business-use percentage. Without adequate records, an audit can disallow the deduction entirely, which on a fully expensed vehicle is a serious adjustment. GPS-based tracking apps produce logs that are harder to challenge than handwritten ones.
Recapture If Business Use Drops
The 50% business-use test applies every year until the vehicle is fully depreciated, not just the year you buy it. If business use falls to 50% or below in any later year, the IRS requires recapture: the difference between what you actually deducted and what you would have deducted under slower straight-line Alternative Depreciation System gets added back to ordinary income in the year use drops.7Internal Revenue Service. About Form 4797, Sales of Business Property For a vehicle fully expensed in year one, the clawback can run into tens of thousands of dollars. You also lose access to accelerated methods for that vehicle going forward and must use ADS straight-line on the remaining basis.
Tax on the Sale
Vehicles are Section 1245 property, so any gain on sale attributable to prior depreciation is taxed as ordinary income rather than at capital gains rates. Compare the sale price to the adjusted basis (original cost minus depreciation taken). Gain up to total depreciation claimed is ordinary income; only gain above that total gets capital gains treatment, which is rare for a used vehicle. If you fully expensed a $68,000 truck and sold it three years later for $35,000, the adjusted basis is zero and the entire $35,000 is ordinary income, reported on Form 4797.7Internal Revenue Service. About Form 4797, Sales of Business Property Accelerated depreciation shifts the timing of the tax, it doesn’t erase it.
Mistakes That Erase the Benefit
The most common error is assuming any SUV clears the GVWR threshold. Many popular midsize SUVs sit right at or just under 6,000 pounds. A 5,900-pound rating falls under the passenger auto caps; a 6,100-pound rating doesn’t. Check the door jamb sticker before you buy.
The second trap is the Section 179 income limit. Owners who had a low-income year sometimes claim a deduction larger than their net business income and end up with a disallowed amount they didn’t plan for. The carryforward helps, but it isn’t the immediate tax savings they expected.
The third is treating a full first-year write-off as the end of the story. The deduction creates future tax exposure when you sell the vehicle, trade it in, or let business use fall below 50%. Planning for those outcomes at the time of purchase, not years later, keeps the strategy from backfiring.