S-Corp Vehicle Deduction: What You Can Write Off in 2026
If your S-corp buys a vehicle and titles it in the company’s name, you can often write off the entire purchase price the year you buy it. If you buy the vehicle personally and just get mileage reimbursement, you can’t get anywhere close to that, no matter how much business use it sees. That gap is the S-corp vehicle deduction, and in 2026 it is worth more than it has been in years, because 100% bonus depreciation is now permanent and the inflation-adjusted limits moved up again. Here is how the rules actually work, and where owners get tripped up.
Who Should Own the Vehicle: You or the S-Corp
The deduction path depends entirely on titling. If you own the car personally and drive it for company business, your only recovery is an accountable plan mileage reimbursement, which we cover in detail in our 2026 mileage rate update. That reimburses you for using the car, not for owning it, and it caps out at the IRS standard rate times your business miles. If the S-corp buys and titles the vehicle instead, the purchase itself becomes a depreciable business asset, and depreciation is where the real S-corp vehicle deduction lives. The vehicle also has to be used more than 50% for business in the year it’s placed in service to qualify for accelerated methods at all, so a mixed-use car parked at a personal residence needs a real mileage log to back up that split.
100% Bonus Depreciation and the S-Corp Vehicle Deduction
Bonus depreciation had been phasing down since 2023 and was scheduled to hit zero in 2027. The One Big Beautiful Bill Act reversed that. Under Section 168(k) as amended by the OBBBA, qualified property acquired and placed in service after January 19, 2025, gets a 100% first-year bonus depreciation deduction, and the provision no longer sunsets. We covered what this did for real estate improvements in our cost segregation article; for vehicles, it means a business-titled car, truck, or SUV placed in service in 2026 is generally eligible for a full first-year write-off of its cost, subject to the caps below.
The Luxury Auto Cap on Ordinary Cars
Section 280F limits how much depreciation you can claim on a “passenger automobile,” a category that covers ordinary cars rated at 6,000 pounds or less of unloaded gross vehicle weight, and trucks, vans, and SUVs with a gross vehicle weight rating (GVWR) of 6,000 pounds or less. These limits apply no matter how expensive the car is. Under Rev. Proc. 2026-15, a passenger automobile placed in service in 2026 that qualifies for bonus depreciation is capped at $20,300 of depreciation in year one, $19,800 in year two, $11,900 in year three, and $7,160 in each year after that. Buy a $70,000 sedan through the S-corp, and 100% bonus depreciation does not mean a $70,000 deduction. It means $20,300 in year one, with the rest recovered over the following years. If the vehicle doesn’t qualify for bonus depreciation at all, the year-one cap drops to $12,300.
The Heavy-Vehicle Exception: Why SUVs and Trucks Are Different
Trucks, vans, and SUVs with a GVWR over 6,000 pounds fall outside the Section 280F “passenger automobile” definition entirely, so the caps above don’t apply to them at all. That’s the mechanism behind the heavy SUV strategy. Section 179 expensing on a heavy SUV is capped separately, but bonus depreciation is not. For an SUV with a GVWR between 6,001 and 14,000 pounds, Section 179(b)(5)(A) limits the Section 179 election to $32,000 for 2026. Bonus depreciation carries no such per-vehicle cap, so a heavy SUV can still get 100% bonus depreciation on its full cost, with Section 179 playing no role at all if you’d rather skip it. Pickup trucks with a cargo bed at least six feet long, and vans seating more than nine passengers behind the driver, aren’t classified as SUVs for this rule in the first place, so they escape the $32,000 cap entirely and can be fully expensed under Section 179 up to the overall 2026 limit of $2,560,000 (phased out once total qualifying purchases exceed $4,090,000), or written off under bonus depreciation instead.
Business Use, Personal Use, and the Recapture Trap
None of this works without the business-use test. Section 179 and full bonus depreciation both require the vehicle to be used more than 50% for business in the year it’s placed in service, and if business use later drops below that threshold, prior deductions can be recaptured as income. Personal use of a company-owned vehicle is not free just because the S-corp owns the car. Under Treasury Regulation 1.61-21, the value of an owner-employee’s personal use of a company vehicle is a taxable fringe benefit that has to be added to that person’s W-2 wages and run through payroll, not absorbed quietly by the deduction. A mileage log showing business trips versus personal trips is what makes the split defensible if the return is ever examined.
Where This Gets Facts-and-Circumstances
The mechanics above assume a straightforward purchase, but real situations rarely stay that simple. A leased vehicle follows different rules than a purchased one. A trade-in changes the depreciable basis. Some states don’t conform to federal bonus depreciation and require an add-back, the way we described in our post on Massachusetts’s OBBBA decoupling. And the right choice between a heavy SUV, a qualifying pickup, and an ordinary sedan depends on what you actually need the vehicle to do, not just which one produces the biggest first-year number. If you’re planning a vehicle purchase through your S-corp, talk to us before you sign anything. Getting the titling, the weight rating, and the business-use documentation right up front is a lot cheaper than fixing it after the IRS asks questions.