Section 280F Luxury Auto Depreciation Limits: The SUV Loophole and How to Maximize Your Business Vehicle Write-Off

Buy a $90,000 sedan for your business and you'll wait roughly two decades to deduct the full cost. Buy a $90,000 SUV that tips the scales at 6,001 pounds and you can write off most of it in year one. Same money, same business, wildly different tax outcome — and it all comes down to a single line in the tax code: Section 280F.

If you're a self-employed consultant, real estate agent, contractor, or small business owner thinking about putting a vehicle on the books, the rules below decide whether you get a meaningful deduction or a frustrating one. Here's how the limits work in 2026, where the so-called "Hummer loophole" still lives, and the documentation traps that turn a clean deduction into an audit headache.

What Section 280F Actually Does

Section 280F of the Internal Revenue Code caps how much depreciation a taxpayer can deduct each year on a "passenger automobile" used for business. Congress wrote the rule in 1984 to stop high earners from buying expensive cars and writing them off as fast as a delivery van. To do that, it forces passenger autos onto a special, slowed-down depreciation schedule rather than the standard five-year MACRS recovery that most business equipment gets.

A "passenger automobile" under Section 280F is any four-wheeled vehicle manufactured primarily for use on public roads, rated at 6,000 pounds gross vehicle weight rating (GVWR) or less. That weight cutoff is the entire ballgame. Cars, crossovers, and small SUVs almost always fall below it. Heavy SUVs, full-size pickups, and cargo vans usually sit above it — and they escape Section 280F's per-year ceilings entirely.

The 2026 Annual Caps

For passenger autos placed in service in 2026, the IRS sets these maximum depreciation deductions per year:

Year	With bonus depreciation	Without bonus depreciation
Year 1	$20,300	$12,300
Year 2	$19,800	$19,800
Year 3	$11,900	$11,900
Year 4 and later	$7,160	$7,160

These figures apply to vehicles acquired after September 27, 2017. The first-year amount jumped slightly from 2025 because of the inflation adjustment tied to the automobile component of the Chained CPI.

Notice the math problem this creates. Add it up and a passenger auto eligible for bonus depreciation hits roughly $59,160 of total deductions across the first four years. After that, you're stuck at $7,160 per year until the basis is exhausted. A $75,000 luxury sedan used 100% for business would take more than 16 years to fully depreciate. For an $80,000 vehicle, it's closer to 19.

The "without bonus depreciation" column matters because under the One Big Beautiful Bill Act (OBBBA), 100% bonus depreciation was reinstated for qualified property placed in service after January 19, 2025 — but you can elect out, and some taxpayers do for state-conformity reasons.

Why Heavier Vehicles Get a Far Bigger Break

Once a vehicle's GVWR exceeds 6,000 pounds, Section 280F's annual caps disappear. The vehicle is no longer a "passenger automobile" for tax purposes. Instead, it's treated like other business equipment, and three powerful tools become available.

Section 179 Expensing

Section 179 lets you deduct the cost of qualifying property in the year you place it in service rather than depreciating it over time. For tax years beginning in 2026, the overall Section 179 limit is $2.56 million, with a dollar-for-dollar phase-out starting at $4.09 million of total qualifying property and full phase-out at $6.65 million.

For SUVs over 6,000 pounds GVWR but not exceeding 14,000 pounds, there's a separate, smaller cap: $32,000 of Section 179 in 2026. This is the "SUV cap" — Congress's response to the original Hummer loophole.

100% Bonus Depreciation

After Section 179, any remaining business-use basis can usually be wiped out by bonus depreciation, which is back at 100% under OBBBA for property placed in service after January 19, 2025. This is what makes heavy SUVs so attractive: the SUV cap limits Section 179 to $32,000, but bonus depreciation can pick up the rest.

The Pickup Truck Carve-Out

Here's the detail most write-ups miss. A pickup truck with a cargo bed of at least six feet — measured from the inside, not the outside — escapes the $32,000 SUV cap entirely. A Ford F-250 crew cab with an 8-foot bed, used 100% for business, can be fully expensed up to the broader Section 179 limit. That's why the truck loophole is, in dollar terms, often more powerful than the SUV one.

Cargo vans without rear seating, vehicles that seat more than nine people behind the driver (think shuttle vans), and certain specialty work vehicles also escape the SUV cap.

A Worked Example

Imagine you're a self-employed real estate agent in 2026 deciding between two vehicles, both $80,000, both used 100% for business:

Option A: Tesla Model S (rated under 6,000 lbs GVWR)

• Year 1 depreciation: $20,300 (capped under Section 280F)
• Year 2: $19,800
• Year 3: $11,900
• Year 4: $7,160
• Years 5–11: $7,160 per year until basis is recovered
• First-year tax savings at a 32% effective rate: about $6,500

Option B: Cadillac Escalade (rated above 6,000 lbs GVWR)

• Section 179: $32,000 (SUV cap)
• 100% bonus depreciation on remaining $48,000
• Year 1 depreciation: $80,000
• First-year tax savings at a 32% effective rate: about $25,600

Same vehicle price, same business use, the heavier SUV delivers nearly four times the first-year tax benefit. That's not a quirk — it's the deliberate result of how Section 280F and the SUV cap interact.

The 50% Business-Use Test

None of the rules above matter if you flunk the business-use test. Section 280F treats vehicles as "listed property," which means you must use them more than 50% for qualified business purposes to claim accelerated depreciation, Section 179, or bonus depreciation. Exactly 50% does not qualify — it has to be greater than 50%.

If business use drops to 50% or less in any year:

• You lose Section 179 and bonus depreciation going forward.
• You must switch to the Alternative Depreciation System (ADS), which uses straight-line depreciation over a longer period.
• Worst of all, you must recapture excess depreciation taken in prior years as ordinary income.

That recapture rule has caught countless taxpayers off guard. A contractor who heavily depreciates a truck in year one and then transitions to mostly-personal use in year three can find themselves with a five-figure tax bill they never saw coming.

Mileage Logs: The Foundation of the Whole Deduction

Business use percentage is determined by miles, full stop. The regulation states plainly: for any vehicle, the business-use percentage equals business miles divided by total miles for the year.

That makes a mileage log the single most important document for vehicle deductions. The IRS expects a contemporaneous log — meaning recorded at or near the time of each trip — that includes for every business drive:

• Date
• Starting point and destination
• Business purpose
• Starting and ending odometer readings (or trip miles)

You should also record the odometer reading on January 1 and December 31 to establish total annual miles. Apps like MileIQ, Everlance, or TripLog automate most of this; spreadsheets work too if you actually update them.

In an audit, this log is the very first thing the agent asks for. Without it, the entire deduction can be disallowed — not partially, not adjusted, disallowed.

The Audit Red Flags

A few patterns reliably draw IRS scrutiny:

1. Claiming 100% business use without owning a personal vehicle. Unless you live somewhere a vehicle isn't required for any personal task, the IRS finds this implausible. If your business car is also your only car, expect the agent to assume some personal use.
2. Round numbers. A log that shows exactly 80% business use every year, with no variation, looks reconstructed. Real life is messy. Real logs reflect that.
3. Heavy vehicles owned by businesses with no obvious need for them. A graphic designer expensing a $90,000 SUV under the heavy-vehicle rules will face questions about whether the vehicle is genuinely required for the business.
4. Commute miles disguised as business miles. Driving from home to your regular office is a non-deductible commute, even if you "talk to a client" on the way. The home-office exception exists, but it requires a qualifying principal-place-of-business home office.
5. Lavish vehicles for modest businesses. A six-figure auto deduction on a Schedule C with $70,000 of revenue invites a closer look.

Lease Inclusion: The Quiet Counterpart

If you lease rather than buy a passenger automobile above a certain fair market value threshold, Section 280F doesn't disappear — it shows up as a lease inclusion amount. This is a small annual figure you must add back to income to mimic the depreciation cap a buyer would face. Rev. Proc. 2026-15 publishes the lease inclusion table alongside the depreciation limits. Most leased vehicles under about $62,000 are unaffected, but high-end leases trigger meaningful add-backs that grow over the lease term.

Practical Planning Moves

A few takeaways for business owners shopping for a vehicle this year:

• Run the GVWR check before you sign. The number printed on the driver's-side door jamb determines which rule set applies. Two trims of the same model can land on different sides of 6,000 pounds.
• Match the vehicle to genuine business need. The deduction is only worth what the cash outlay leaves behind. A $90,000 SUV with $30,000 of first-year tax savings still costs $60,000 net — far more than a useful $40,000 truck.
• Document day one. Start the mileage log the week the vehicle is placed in service, not the next April when you're preparing the return.
• Watch the 50% cliff. If you suspect business use will drift down over time, accelerated depreciation creates recapture risk. A more conservative depreciation election can sidestep it.
• Coordinate with bonus depreciation strategy. If you're already in a low-income year, electing out of bonus depreciation may shift deductions into more valuable future years, even though it's mathematically slower.

Keep Your Vehicle Records Audit-Ready From Day One

Whether you take the Section 280F passenger-auto path or the heavy-vehicle path, the deduction lives or dies on documentation. That means clean books that separate vehicle costs, business and personal mileage tied to specific trips, and a depreciation schedule you can actually explain. Beancount.io gives you plain-text accounting that's transparent, version-controlled, and AI-ready — every transaction sits in a file you can read, search, and audit yourself, with no vendor lock-in. Get started for free and keep your business vehicle records, and the rest of your books, in a format that holds up to any review.