Buy a qualifying business vehicle in 2026 and the tax code lets you expense the business share of it in year one: Section 179 up to $2,560,000 of qualifying property overall, a $32,000 per-vehicle cap on heavy SUVs, and 100% bonus depreciation permanently restored for property acquired after January 19, 2025. A $72,000 heavy SUV used fully for business writes off to zero in year one, worth about $17,280 at a 24% marginal rate. Here's how the pieces interact, which vehicles get which treatment, and where the traps are.
It's an election, not a refund. Normal depreciation spreads a business asset's cost over its useful life: five years for most vehicles. Section 179 lets you front-load the whole thing into the year you place the property in service, up to an annual dollar limit. For 2026 that limit is $2,560,000, and it phases down dollar-for-dollar once your total qualifying property passes $4,090,000, which is a large-business problem, not a small-business one.
Three conditions do the real work. The property must be used in a trade or business (personal vehicles don't count, and business use above 50% is required for vehicles). Your deduction can't exceed your aggregate business income for the year. And you elect it on the return for the year the vehicle was placed in service, not merely purchased, so a December delivery van bought but not delivered until January belongs to January.
| Year | Overall limit | Phase-out starts | SUV cap | Bonus depreciation |
|---|---|---|---|---|
| 2023 | $1,160,000 | $2,890,000 | $28,900 | 80% |
| 2024 | $1,220,000 | $3,050,000 | $30,500 | 60% |
| 2025 (post-OBBBA) | $2,500,000 | $4,000,000 | $31,300 | 100% (acquired after 1/19/2025) |
| 2026 | $2,560,000 | $4,090,000 | $32,000 | 100% |
The One Big Beautiful Bill Act (July 2025) reset the Section 179 base to $2.5 million for tax years beginning after 2024 and made 100% bonus depreciation permanent for qualified property acquired after January 19, 2025, killing the TCJA phase-down that had bonus dropping 20 points a year. Everything is inflation-indexed going forward, so expect small annual bumps in each column.
The classification that matters is GVWR, the gross vehicle weight rating on the certification sticker in the driver's door jamb, not the curb weight and not the marketing.
The SUV definition is statutory and specific: four-wheeled vehicles built primarily for carrying people over public roads, or with off-road-capable features. That's why the cargo-configured version of the same van that a family version of can't escape the cap does escape it. Trim levels straddle the 6,000-lb line constantly, so the door-jamb sticker is the only source that counts.
Price, GVWR class, business-use percent, and bonus election in; your first-year deduction and tax value out.
Open the Vehicle Section 179 Calculator →Eligible basis is price times business-use percentage, and that percentage comes from your mileage log. A $88,000 SUV at 85% business use has $74,800 of eligible basis. Then the caps stack: Section 179 for the vehicle is the smallest of the effective overall limit (after any phase-down), the $32,000 SUV cap, and the eligible basis. Whatever basis Section 179 didn't consume goes to bonus depreciation at whatever percentage is in force. For the $88,000 example in 2025: $31,300 through Section 179, $43,500 through 100% bonus, $74,800 total in year one, worth $16,456 at a 22% marginal rate.
Two common complications. If your other Section 179 property already exceeds the $4,090,000 threshold, the vehicle's effective limit shrinks dollar-for-dollar. And if you elect less than 100% bonus, the uncovered basis depreciates on the normal MACRS schedule instead, which is sometimes deliberate: low-income years, or state planning.
Federal law isn't the whole return. California doesn't conform to bonus depreciation at all and applies its own Section 179 limits, including a $25,000 SUV cap, so a fully expensed federal vehicle can produce a much smaller state deduction. Most states conform fully, but the non-conforming list shifts, and it changes the real value of the election if you're in one of them. This is the situation where the SUV cap genuinely bites in 2026 despite 100% bonus existing federally: the state return only sees the Section 179 slice.
For the running-cost side of the same decision, the actual vs standard mileage calculator compares the deduction methods on an existing vehicle, the self-employment tax calculator prices what the net income actually costs, and the car depreciation calculator shows the market-value curve on the other side of the ledger.
If it's used more than 50% for business, yes, essentially all of the business portion in year one for 2026. A qualifying heavy SUV takes the first $32,000 through Section 179 and the rest through 100% bonus depreciation; a pickup with a 6-foot-plus bed and no rear seating, or a cargo van, skips the SUV cap entirely and can take the full business-share as Section 179. At a 24% marginal rate, $75,000 of first-year deduction is worth about $18,000 of federal tax reduction.
Congress saw the Hummer loophole coming. Section 280F imposes a dollar cap on Section 179 for vehicles between 6,001 and 14,000 lbs GVWR that count as SUVs under the statutory definition, while vehicles that aren't passenger-oriented, like a work truck with no seating behind the driver or a van with an enclosed cargo area, remain uncapped. The 2026 SUV cap is $32,000, up from $31,300 in 2025 and $30,500 in 2024.
Less than it used to, but yes. Federally, permanent 100% bonus depreciation (for property acquired after January 19, 2025) absorbs whatever basis the SUV cap leaves behind, so the year-one total is often the same. The cap still matters in states that don't conform to bonus depreciation, like California, where the Section 179 amount is what the state return sees, and in any year you elect reduced bonus. It also matters for the order of operations if you place a lot of other property in service and hit the phase-out.
Three things mostly. Business use at or below 50%, measured by mileage log, kills both Section 179 and bonus eligibility. Vehicles bought to resell, or used predominantly for hire (taxis, hotel shuttles), don't qualify. And the deduction can't exceed your business income for the year, though unused amounts carry forward. Commuting never counts as business use, and inflated business-use percentages are a standing audit flag.
Usually, with two caveats. It's timing, not free money: you're taking five years of depreciation in one, so future years have nothing left to deduct, and if business use drops below 50% later, recapture rules pull the excess back into income. And the alternative, the standard mileage rate, sometimes wins for cheap high-mileage vehicles, which the actual-vs-standard mileage comparison settles case by case. Run both before you buy the truck for the tax story alone.