For federal tax purposes, the useful life of a vehicle used in a 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), regardless of how long the vehicle actually runs or how much you paid for it. The five-year label is a starting point, though. Depending on the vehicle’s weight, your business-use percentage, and which accelerated methods you elect, the real write-off window can shrink to a single year or stretch to nearly a decade.
Why the IRS Says Five Years
MACRS does not let you pick a useful life based on how long you expect the vehicle to run. It assigns every category of depreciable business property to a fixed property class, and ordinary road vehicles used in a business fall into the 5-year class. A $25,000 pickup and a $90,000 sedan get the same classification. So does a truck you plan to drive for three years and one you plan to keep for fifteen.
Other property classes exist for other assets. Some tools and manufacturing equipment sit in the 3-year class; certain farm and construction equipment sits in the 7-year class. But standard business vehicles almost always land at five.
Why Five Years Actually Spans Six Tax Returns
The 5-year period does not translate to five equal annual deductions of 20%. Two mechanics change the math.
MACRS uses the 200% declining balance method for 5-year property, which front-loads deductions. You claim a larger share of the vehicle’s cost in years one and two, with progressively smaller amounts after that. The system automatically switches to straight-line depreciation partway through the recovery period when straight-line produces a larger deduction.
The default timing rule is the half-year convention. It treats the vehicle as though you placed it in service at the midpoint of the year, no matter when you actually bought it. Because only half a year of depreciation is allowed in year one, the remaining balance spills into a sixth calendar year. So “5-year property” typically shows up on six tax returns.
Section 179: Compressing the Timeline to Year One
Section 179 lets you deduct the entire cost of qualifying business property in the year you place it in service instead of spreading it out. For 2026, the maximum Section 179 deduction is $2,560,000, with a dollar-for-dollar phaseout once total qualifying property placed in service exceeds $4,090,000. Most vehicle buyers will not come close to those ceilings, but two vehicle-specific limits do bite.
Passenger automobiles with a gross vehicle weight rating (GVWR) of 6,000 pounds or less are subject to the Section 280F depreciation caps described below. Those caps override Section 179 on lighter vehicles. You cannot use Section 179 to blow past the annual dollar caps.
Heavy SUVs over 6,000 pounds GVWR have their own Section 179 sub-limit of $32,000 for 2026. Heavy pickup trucks and cargo vans that are not classified as SUVs are not subject to that sub-limit and can qualify for the full Section 179 amount.
Section 179 also has an income floor. The deduction cannot exceed your taxable income from the active conduct of a trade or business during the year. If claiming it would create or enlarge a net operating loss, the excess carries forward rather than producing an immediate benefit.
100% Bonus Depreciation Is Back
Bonus depreciation lets you immediately deduct a percentage of the cost of qualifying property in the first year, on top of any Section 179 deduction. The rate had been phasing down under the Tax Cuts and Jobs Act: 80% in 2023, 60% in 2024, and 40% at the start of 2025.
That phasedown is now largely moot. The One Big Beautiful Bill Act, signed on July 4, 2025, permanently reinstated 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025.1Internal Revenue Service. One, Big, Beautiful Bill Provisions A business vehicle purchased after that date qualifies for full first-year bonus depreciation if it meets the other requirements.
Unlike Section 179, bonus depreciation has no overall dollar cap and no taxable income limitation. You can claim it even if the business is running a net loss, which matters for startups and for businesses in expansion mode. It applies to both new and used vehicles, as long as the vehicle is new to you.2Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
One caveat: bonus depreciation on passenger vehicles under 6,000 pounds is still limited by the Section 280F caps. A 100% rate does not unlock unlimited first-year deductions on a $60,000 sedan; it only shifts you to a higher bonus-eligible first-year cap.
The 6,000-Pound Line That Stretches Recovery Past Five Years
The IRS imposes annual dollar limits on depreciation for passenger automobiles with a GVWR of 6,000 pounds or less. These are commonly called the luxury auto caps, though they apply to plenty of vehicles no one would call luxurious. The purpose is to keep businesses from writing off expensive personal cars.
For a passenger automobile placed in service in 2026 where bonus depreciation applies, the maximum allowable depreciation is:3Internal Revenue Service. Rev. Proc. 2026-15
- Year 1: $20,300
- Year 2: $19,800
- Year 3: $11,900
- Each succeeding year: $7,160
If bonus depreciation does not apply, either because you elected out or because the vehicle does not qualify, the year-one cap drops to $12,300, with the same amounts in later years.3Internal Revenue Service. Rev. Proc. 2026-15
This is where the five-year useful life stretches out. Buy a $60,000 sedan and your deductions get capped at these amounts. You will not recover the full cost in five or even six years. The unrecovered basis carries forward at $7,160 per year until the vehicle is fully depreciated. For an expensive passenger car, the effective recovery period can run to eight or nine years, well beyond the nominal 5-year MACRS classification.
The Heavy Vehicle Exception That Shrinks Useful Life to Zero
Vehicles with a GVWR above 6,000 pounds are exempt from the Section 280F annual caps entirely.4Office of the Law Revision Counsel. 26 U.S. Code 280F – Limitation on Depreciation for Luxury Automobiles This is the single most important dividing line in business vehicle tax planning. A qualifying heavy SUV, pickup, or van can be fully written off in year one through some combination of Section 179 and 100% bonus depreciation, making the tax useful life effectively zero.
For heavy SUVs, the Section 179 deduction is capped at $32,000 for 2026, but 100% bonus depreciation applies to the remaining cost with no dollar cap. A qualifying $80,000 SUV over 6,000 pounds GVWR could yield $32,000 under Section 179 plus bonus depreciation on the remaining $48,000, wiping out the entire purchase price in the first year.
Heavy non-SUV vehicles, which covers most full-size pickup trucks and cargo vans, are not subject to the $32,000 SUV sub-limit. They can qualify for the full Section 179 amount. The vehicle must be used more than 50% for business, and deductions scale with the business-use percentage.
The 50% Business Use Rule and the Recapture Trap
Every accelerated method above requires more than 50% qualified business use during the tax year. If business use is 50% or less, you lose Section 179, bonus depreciation, and the accelerated MACRS method. You have to use straight-line depreciation over the 5-year recovery period instead, which produces smaller, more evenly distributed deductions.5Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
The bigger risk comes if business use drops below 50% after you have already claimed accelerated deductions. You have to recapture the excess depreciation, meaning the difference between what you actually deducted and what you would have deducted under the straight-line alternative depreciation system. That excess is added back to your gross income as ordinary income in the year business use drops.4Office of the Law Revision Counsel. 26 U.S. Code 280F – Limitation on Depreciation for Luxury Automobiles Going forward you also have to use straight-line for all remaining years, even if business use later climbs back above 50%.
Claim $32,000 in Section 179 on a heavy SUV in year one, drop to 40% business use in year two, and a substantial slice of that benefit gets clawed back.
Leased Vehicles Follow a Different Path
Depreciation only enters the picture if you own the vehicle. If you lease, you deduct the business-use portion of each lease payment as an operating expense, and the vehicle never appears on your depreciation schedule.
To keep leasing from becoming a workaround for the Section 280F caps, a parallel rule called the lease inclusion amount applies. For passenger vehicles with a fair market value above a threshold, you add an amount to gross income each year of the lease, which reduces the net lease deduction. Inclusion amounts for leases beginning in 2026 are set out in Rev. Proc. 2026-15 and depend on the vehicle’s fair market value at the start of the lease.3Internal Revenue Service. Rev. Proc. 2026-15 Vehicles over 6,000 pounds GVWR are exempt from the inclusion rule, mirroring the exemption from the depreciation caps.
Skipping Depreciation With the Standard Mileage Rate
You can bypass the depreciation question entirely by using the IRS standard mileage rate: 72.5 cents per mile for 2026.6Internal Revenue Service. The Standard Mileage Rates and Maximum Automobile Fair Market Values Have Been Updated for 2026 The flat per-mile rate replaces separate deductions for gas, insurance, repairs, and depreciation. A depreciation component is baked into the rate, so MACRS deductions are not available on top of it.
To use the standard rate, you generally have to elect it in the first year the vehicle is available for business use. Claim actual expenses and depreciation in year one and you usually cannot switch to the standard rate on that vehicle later. The standard rate is simpler and often works well for vehicles driven heavily for business, while the actual expense method with depreciation tends to yield larger deductions for expensive vehicles with high business-use percentages.