For federal tax purposes, the useful life of a vehicle used in business is five years. That is the recovery period the IRS assigns to cars, light trucks, SUVs, and vans under the Modified Accelerated Cost Recovery System (MACRS), and it applies no matter how long the vehicle actually runs or how much you paid for it. The practical write-off timeline, though, can be anywhere from one year to nine, depending on the vehicle’s weight, how you use it, and which accelerated deductions you claim.
Why the IRS Says Five Years
You do not get to decide how long your business vehicle will last for tax purposes. MACRS sorts every type of depreciable business asset into a fixed property class with a preset recovery period, and ordinary road vehicles land in the 5-year class. A $25,000 pickup and a $90,000 sedan both get the same classification. The rule is based on the type of asset, not its price or expected mileage.
Some assets fall into other classes. Certain tools and manufacturing equipment are 3-year property; some farm and construction equipment is 7-year property. Standard business vehicles almost always sit in the 5-year bucket.
Why Five Years Actually Spans Six Tax Returns
The 5-year recovery period does not translate into five equal 20% deductions. Two features shift the math.
First, MACRS applies the 200% declining balance method to 5-year property, which front-loads the deductions. You write off a larger share of the vehicle’s cost in the first couple of years, with smaller amounts later on. The system automatically switches to straight-line depreciation partway through when that produces a bigger deduction.
Second, the default half-year convention treats the vehicle as if you placed it in service exactly at the midpoint of the year, no matter when you bought it. A truck purchased in February and one purchased in November receive the same first-year percentage. Because only half a year’s depreciation lands in year one, the remaining balance pushes into a sixth calendar year. So 5-year property actually appears on six tax returns.
One wrinkle: if your business places more than 40% of its total depreciable property in service during the last three months of the year, the mid-quarter convention applies instead. Each asset’s first-year depreciation then depends on which quarter you bought it, and a fourth-quarter vehicle gets a much smaller first-year write-off.
How to Deduct the Whole Vehicle in Year One
Two accelerated methods can collapse the 5-year schedule into a single year. Both have requirements, and both interact with the vehicle’s weight.
Section 179
Section 179 lets you deduct the full cost of qualifying business property in the year you place it in service. For 2026, the overall maximum is $2,560,000, phasing out dollar-for-dollar once total qualifying property placed in service passes $4,090,000. Vehicle purchases rarely approach those ceilings, but two vehicle-specific limits matter:
- Passenger automobiles weighing 6,000 pounds or less (by gross vehicle weight rating) are capped by the Section 280F “luxury auto” limits described below, which override Section 179.
- Heavy SUVs over 6,000 pounds GVWR have their own Section 179 sub-limit of $32,000 for 2026. Heavy pickups and vans that are not classified as SUVs can qualify for the full Section 179 amount without that sub-limit.
Section 179 also has an income floor. The deduction cannot exceed your taxable income from the active conduct of any trade or business for the year. Any excess carries forward instead of producing an immediate tax benefit.
100% Bonus Depreciation
Bonus depreciation lets you immediately deduct a percentage of a qualifying asset’s cost in the first year, on top of any Section 179 claim. The Tax Cuts and Jobs Act had it phasing down to 40% in early 2025, but the One Big Beautiful Bill Act, signed on July 4, 2025, permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025.1Internal Revenue Service. One, Big, Beautiful Bill Provisions Any business vehicle bought after that date qualifies for a full first-year write-off if it meets the other rules.
Unlike Section 179, bonus depreciation has no overall dollar cap and no taxable income limit. You can claim it even in a loss year, which helps startups and expanding businesses. It applies to new and used vehicles alike, as long as the vehicle is new to you.2Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
The 6,000-Pound Line That Changes Everything
The single most important number in business vehicle tax planning is 6,000 pounds of gross vehicle weight rating. Vehicles above that threshold are exempt from the Section 280F annual depreciation caps.3Office of the Law Revision Counsel. 26 U.S. Code 280F – Limitation on Depreciation for Luxury Automobiles Vehicles at or below it are not.
Heavy Vehicles: Effectively a Zero-Year Useful Life
A qualifying heavy SUV, pickup, or van can have its entire cost written off in year one. For heavy SUVs, Section 179 is capped at $32,000 for 2026, but 100% bonus depreciation then applies to whatever remains, with no dollar ceiling. Buy a qualifying $80,000 SUV over 6,000 pounds GVWR, use it more than 50% for business, and you can take $32,000 under Section 179 and bonus-depreciate the remaining $48,000, zeroing out the basis in year one.
Heavy pickups and cargo vans that are not SUVs skip the $32,000 sub-limit entirely and can claim the full Section 179 amount, with bonus depreciation on top.
Passenger Vehicles Under 6,000 Pounds: Caps That Stretch the Timeline
Lighter passenger automobiles are subject to annual dollar limits, often called the luxury auto caps even though they catch plenty of ordinary cars. For a passenger automobile placed in service in 2026 with bonus depreciation applied, the maximum deductions are:4Internal Revenue Service. Rev. Proc. 2026-15
- Year 1: $20,300
- Year 2: $19,800
- Year 3: $11,900
- Each year after that: $7,160
If bonus depreciation does not apply, the year-one cap drops to $12,300 and the later caps stay the same.4Internal Revenue Service. Rev. Proc. 2026-15
This is where the “useful life” idea gets stretched well past five years. Buy a $60,000 sedan, run into these caps, and you will not recover the full cost in five or even six years. The unrecovered basis keeps rolling forward at $7,160 per year. For an expensive passenger car, the effective recovery period can run eight or nine years, far longer than the nominal 5-year classification.
The 50% Business Use Condition
Every accelerated method above requires that you use the vehicle more than 50% for qualified business purposes during the tax year. If business use is 50% or less, you lose Section 179, bonus depreciation, and the accelerated MACRS method, and you must depreciate the vehicle on a straight-line basis over the 5-year period instead.5Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
It gets worse if business use drops below 50% after you have already claimed accelerated deductions. You must recapture the excess depreciation, meaning the difference between what you actually deducted and what you would have deducted under straight-line, and that amount is added back to gross income as ordinary income in the year the drop happens.3Office of the Law Revision Counsel. 26 U.S. Code 280F – Limitation on Depreciation for Luxury Automobiles From that point forward you depreciate on a straight-line basis, even if business use later climbs back above the threshold.
A $32,000 Section 179 deduction on a heavy SUV in year one can turn into a sizable recapture bill in year two if your business use slips to 40%. Aggressive front-loading is only as safe as your mileage pattern.
Leasing and the Standard Mileage Rate
If you lease rather than buy, depreciation rules do not apply to you directly. You deduct the business-use portion of each lease payment as an operating expense. To keep leasing from becoming a Section 280F workaround, passenger vehicles above a fair-market-value threshold trigger an annual lease inclusion amount, which reduces your lease deduction in rough proportion to the depreciation caps. The amounts for 2026 leases appear in Rev. Proc. 2026-15.4Internal Revenue Service. Rev. Proc. 2026-15 Vehicles over 6,000 pounds GVWR are exempt from the inclusion requirement, just as they are exempt from the purchase caps.
The standard mileage rate (72.5 cents per mile for 2026) is the other alternative to tracking actual expenses and depreciation.6Internal Revenue Service. The Standard Mileage Rates and Maximum Automobile Fair Market Values Have Been Updated for 2026 A depreciation component is baked into the rate, so you cannot claim MACRS on top. You generally must choose the standard mileage rate in the first year the vehicle is available for business use; claim actual expenses and depreciation that year and you usually cannot switch later for that vehicle.
Depreciation Comes Back When You Sell
Every dollar of depreciation you claim reduces the vehicle’s adjusted basis. If you later sell for more than that basis, the gain attributable to prior depreciation is taxed as ordinary income under Section 1245, not at capital gains rates. The recaptured amount equals the lesser of total depreciation taken or the gain on the sale.
Buy a truck for $50,000, write off the full $50,000 through Section 179 and bonus depreciation, and sell it a few years later for $20,000. The adjusted basis is zero, so the full $20,000 is ordinary income. If a gain somehow exceeded total depreciation claimed, the excess could qualify for capital gains treatment. Sales and dispositions are reported on IRS Form 4797. A sale below adjusted basis produces an ordinary business loss, though the personal-use portion of a mixed-use vehicle generates no deductible loss.
Contemporaneous mileage records are what hold all of this together. Without them, the IRS can disallow depreciation outright, and losing deductions after the fact triggers the same recapture arithmetic as a drop in business use.5Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses