Section 179 on used vehicles works much the same way it does on new ones: if you buy a used vehicle for your business, place it in service during the tax year, and drive it more than 50% for business, you can deduct a large share of the cost in year one. How much depends on the vehicle’s gross vehicle weight rating and your business-use percentage. Heavy trucks and vans can be written off in full. SUVs between 6,000 and 14,000 pounds face a $32,000 Section 179 cap for 2026. Lighter cars are held to the luxury-auto ceiling of $20,300 in the first year.
When a Used Vehicle Qualifies
Three conditions have to line up. You bought the vehicle for business use, you placed it in service during the year you’re claiming the deduction, and the vehicle is new to you.1Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets
“New to you” has teeth. You cannot buy the vehicle from a spouse, parent, child, grandchild, or other related party defined under IRC Section 267, which covers family members and entities you control. A truck from your brother-in-law is fine. The same truck from your son is not. You also can’t have personally used the vehicle before this purchase, even if it changed hands several times among unrelated owners in between.
Business use has to exceed 50%. Vehicles are treated as listed property, and listed property that drops to 50% business use or below loses Section 179 eligibility outright and shifts to a slower depreciation method.2Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
One more limit worth knowing: your Section 179 deduction can’t exceed net taxable income from your active trades or businesses. If the business generated $40,000 in taxable income, your Section 179 write-off is capped at $40,000 for the year no matter what the vehicle cost. Anything disallowed carries forward.
How Much You Can Deduct in 2026 by Weight Class
Look on the sticker inside the driver’s side door jamb for the gross vehicle weight rating. GVWR is the single biggest lever on your deduction, because it decides whether the luxury-auto caps apply.
Heavy Trucks and Vans Over 14,000 Pounds GVWR
Heavy-duty pickups, large cargo vans, and work trucks with a GVWR above 14,000 pounds qualify for the full Section 179 deduction, up to the 2026 annual maximum of $2,560,000 across all qualifying property.1Office of the Law Revision Counsel. 26 U.S. Code 179 – Election to Expense Certain Depreciable Business Assets A $90,000 used heavy-duty pickup can be expensed entirely in year one, assuming business income supports the write-off. These vehicles are too large to count as passenger automobiles under the code.
SUVs Between 6,000 and 14,000 Pounds GVWR
Larger SUVs built on a truck chassis but designed for passenger use fall into a middle tier. For 2026, Section 179 on these vehicles is capped at $32,000. Cargo-only vehicles at this weight, like windowless vans with no rear seating, sit outside this cap and can take the full deduction.
Cars, Crossovers, and Small SUVs at 6,000 Pounds or Less
Most sedans, crossovers, and small SUVs come in under 6,000 pounds GVWR, and the tax code is far less generous here. The luxury-auto limits under IRC Section 280F put a hard ceiling on first-year deductions regardless of what the vehicle actually cost.
For a lighter vehicle placed in service during 2026 that qualifies for bonus depreciation, the maximum combined first-year deduction from Section 179, bonus depreciation, and regular depreciation is $20,300. Without bonus depreciation, the first-year cap drops to $12,300.3Internal Revenue Service. Rev. Proc. 2026-15 Later years are capped at $19,800 in year two, $11,900 in year three, and $7,160 in each subsequent year until you recover the full cost.
On a $55,000 used sedan, Section 179 helps you reach the $20,300 first-year ceiling faster but can’t push past it. The remaining $34,700 comes off over the following years at those capped amounts.
Stacking Bonus Depreciation on Top
Bonus depreciation is a separate write-off that runs alongside Section 179, and for 2026 it’s back at 100%. The One Big Beautiful Bill Act permanently reinstated the full rate for qualified property acquired after January 19, 2025.4Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill It applies automatically unless you elect out, and it is not limited by your business income the way Section 179 is. The typical order is to take Section 179 first, then apply bonus depreciation to whatever cost remains.
For a heavy vehicle over 6,000 pounds, the math gets very favorable. Buy a used SUV for $75,000 and the $32,000 SUV cap limits Section 179 to $32,000. That leaves $43,000 in remaining basis. At 100% bonus, you deduct that $43,000 too, and the full $75,000 comes off in year one if business use is 100%.
For lighter vehicles, bonus depreciation helps you hit the $20,300 first-year ceiling but doesn’t lift the ceiling itself. That $20,300 figure already builds in an $8,000 increase specifically tied to bonus-eligible vehicles.3Internal Revenue Service. Rev. Proc. 2026-15
One caveat specific to used property: OBBBA includes a special rule on used-property eligibility for 100% bonus depreciation, and certain vehicles may need to satisfy extra requirements tied to their prior use. If you’re buying a vehicle that has been in continuous commercial service for years, confirm eligibility with a tax professional before assuming the full rate.
Records That Support the Business-Use Percentage
The deduction is only as good as the log behind it. Because vehicles are listed property, the IRS holds you to contemporaneous substantiation, meaning you record trips at or near the time you take them. Reconstructing months of driving at tax time doesn’t meet the standard.
Each business trip needs four things logged:
- Date of the trip
- Business miles driven that day
- Destination
- Business purpose
Digital mileage apps with exportable reports satisfy the requirement and are easier to keep current than a paper log. You also need odometer readings at the start and end of each tax year so you can calculate total miles and derive the business-use percentage. Per-trip odometer readings are not required.
Business miles divided by total annual miles gives the percentage that scales your deduction. An $80,000 truck used 75% for business supports Section 179 on $60,000, not $80,000. Claiming 100% business use on a vehicle you also run personal errands in is a familiar audit trigger. Depreciation claims go on IRS Form 4562.
What Happens if Business Use Drops or You Sell
A big first-year deduction on a used vehicle creates a future tax obligation many buyers don’t see coming. If business use falls to 50% or below in any year during the recovery period, you have to recapture part of the Section 179 deduction as ordinary income.2Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles The vehicle is retroactively switched to straight-line depreciation, and the difference between what you claimed and what straight-line would have allowed is added back to income.
Selling triggers a separate recapture under IRC Section 1245. Any gain attributable to prior depreciation, including Section 179 and bonus, is taxed as ordinary income rather than at capital gains rates.5Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property The recaptured amount is the lesser of total depreciation taken or the gain realized. Claim $70,000 in combined Section 179 and bonus depreciation on a truck, sell it three years later for $45,000, and that entire $45,000 gain can be taxed as ordinary income.
If the sale price exceeds your original purchase price, the excess above total depreciation may qualify for long-term capital gains treatment on a vehicle held more than a year. Both the recapture and any remaining gain go on IRS Form 4797.6Internal Revenue Service. About Form 4797 – Sales of Business Property
State Conformity Is Not Automatic
Federal rules are only half the picture. About a dozen states and the District of Columbia do not fully conform to the federal Section 179 limits. Some cap their own equivalent at $25,000, a fraction of the federal ceiling. A vehicle that generates a $75,000 federal deduction might only produce a $25,000 deduction on your state return, and you’ll be tracking the timing difference across several years of state depreciation. Check your state’s current conformity before building a tax plan around the federal numbers alone.