New Car Tax Deductions: Sales Tax, Section 179, and Mileage

A new car tax deduction depends almost entirely on how you use the vehicle. Buy it for personal driving and your only federal write-off is the state and local sales tax you paid at the dealership, and even that requires you to itemize. Buy it for a trade or business and you may be able to deduct most or all of the purchase price in the first year through Section 179 expensing and bonus depreciation, provided business use tops 50% and you keep the records to prove it.

Personal Use: Sales Tax and Not Much Else

For a car you drive personally, the deduction available to you is the sales tax paid on the purchase, claimed on Schedule A. Two conditions apply. You have to itemize rather than take the standard deduction, and you have to elect to deduct state and local sales taxes instead of state income taxes. You cannot claim both in the same year.¹

Itemizing only pays off when your total itemized deductions exceed the standard deduction. For 2026, that standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.² The sales tax alone on a $40,000 car will not clear that bar. Combined with property tax, mortgage interest, and other itemized items, it might. The math is friendliest in states with no income tax, where the sales-tax election costs you nothing.

Everything you claim on Schedule A for state and local taxes competes for space under the SALT cap. For 2026, that cap is roughly $40,000 for most filers and $20,000 for married taxpayers filing separately, and it phases down for higher-income taxpayers but never below $10,000.³ Sales tax, state income tax, and property tax all share that single cap.

Value-Based Registration Fees

If your state charges an annual registration fee tied to the car’s value, the value-based portion is deductible as personal property tax on Schedule A, subject to the same SALT cap.⁴ Flat charges, weight-based fees, and plate costs are not deductible. Your state DMV breakdown will show which portion qualifies.

W-2 Employees Get Nothing for Driving Their Own Car to Work

If you are a regular W-2 employee driving a personal car for job duties, the federal deduction for unreimbursed employee business expenses is gone. The Tax Cuts and Jobs Act eliminated it starting in 2018, and the One Big Beautiful Bill Act made that repeal permanent. A narrow exception on Form 2106 still exists for Armed Forces reservists, qualified performing artists, fee-basis state or local officials, and employees with impairment-related work expenses.⁵ For everyone else, an accountable reimbursement plan from the employer is the practical substitute.

The Clean Vehicle Credit Is No Longer Available

If you were counting on the federal EV credit, it is off the table for new purchases. Congress repealed the Section 30D clean vehicle credit as part of the One Big Beautiful Bill Act, and it applies only to vehicles acquired on or before September 30, 2025.⁶ State incentives may still exist, but there is no federal credit for a new EV bought in 2026.

Business Use Changes Everything

The real deductions live on the business side. To claim any depreciation or expensing on a vehicle purchase, you must use the vehicle more than 50% for business during the tax year.⁷ Business use covers driving related to your trade: client meetings, travel between job sites, hauling equipment, deliveries. Your business-use percentage becomes the multiplier for nearly every deduction on the car.

Commuting between home and a regular workplace does not count, no matter the distance. One useful exception: if you have a home office that qualifies as your principal place of business, trips from that home office to client sites or other work locations in the same trade are deductible business miles.⁸

The Mileage Log Is Not Optional

The IRS expects a contemporaneous mileage log listing the date, destination, business purpose, and miles for each business trip. Contemporaneous means written down at or near the time of the trip, not reconstructed at tax time. Without a log, the IRS can disallow the entire vehicle deduction on audit.⁵ Business miles divided by total miles gives you your business-use percentage. Drive 9,000 business miles out of 15,000 total and you are at 60%.

Writing Off the Purchase Price

Three depreciation tools stack on top of each other for a business vehicle.

Section 179 Expensing

Section 179 lets you deduct the full purchase price of a qualifying business vehicle in the year it is placed in service. The overall 2026 Section 179 cap is $2,560,000, with a phase-out starting at $4,090,000 in total qualifying property.² Two catches for a single-vehicle buyer: Section 179 cannot create or deepen a business loss (it is limited to your business’s taxable income for the year), and passenger cars face a much lower per-vehicle cap covered below.

Bonus Depreciation

The One Big Beautiful Bill Act made 100% bonus depreciation permanent for qualifying property acquired after January 19, 2025.⁹ For a 2026 business vehicle, that means you can write off the entire cost in year one, still subject to the passenger auto caps for lighter vehicles. Bonus depreciation has no taxable-income limitation, so it can generate or increase a net operating loss. It applies automatically unless you elect out.

MACRS

Whatever cost basis remains after Section 179 and bonus depreciation is recovered under the Modified Accelerated Cost Recovery System, where vehicles are five-year property.¹⁰ For a heavy vehicle expensed fully in year one, MACRS may have nothing left to work with. For a passenger car capped by the luxury limits, MACRS is how the leftover basis gets recovered across future years.

The Passenger Vehicle Caps

Here is where the first-year write-off gets clipped. The IRS caps annual depreciation on passenger vehicles, meaning four-wheeled vehicles rated at 6,000 pounds gross vehicle weight or less.¹¹ These caps apply whether you claim Section 179, bonus depreciation, MACRS, or a mix. For a passenger auto placed in service in 2026 with 100% bonus depreciation:

Year 1: $20,300
Year 2: $19,800
Year 3: $11,900
Each year after: $7,160

Elect out of bonus depreciation and the first-year cap drops to $12,300; the later years stay the same.¹² The caps assume 100% business use. Lower business use scales them down. An $55,000 sedan at 80% business use has a first-year ceiling of $16,240, and the rest of the cost recovers over years.

The Heavy Vehicle Exception

Vehicles with a gross vehicle weight rating above 6,000 pounds are not passenger autos, so the luxury caps do not apply.¹¹ A qualifying heavy pickup, cargo van, or work truck can absorb the full Section 179 and bonus deduction in the first year, limited only by the overall Section 179 cap and business-use percentage.

SUVs rated between 6,000 and 14,000 pounds get a partial break. They escape the passenger caps but face a separate Section 179 ceiling of $32,000 for 2026. Anything above that can still be picked up through 100% bonus depreciation, so most heavy SUVs used entirely for business can be fully written off in year one. Trucks and vans with a cargo bed at least six feet long are not subject to the SUV limit. The heavy-vehicle write-off is a well-known incentive, and the IRS scrutinizes business-use percentages on large SUVs closely. Your mileage log has to hold up.

Two Ways to Deduct Operating Costs, and a Lock-In Trap

Beyond the purchase price, you also deduct the ongoing cost of running the vehicle. The IRS gives you two methods.

Standard Mileage Rate

The simpler method. For 2026, the business rate is 72.5 cents per mile.¹³ That rate already includes gas, insurance, repairs, and a depreciation component (35 cents per mile for 2026).¹⁴ Business parking and tolls are deductible on top.¹⁵

Actual Expense Method

Track everything: fuel, oil, tires, repairs, insurance, registration, loan interest or lease payments, and depreciation. Total the costs and multiply by your business-use percentage. This method tends to produce a larger deduction on expensive-to-operate vehicles, on heavily depreciated cars, and when business use is high but total miles are low.

The Choice Gets Locked In

If you want the standard mileage rate, you have to elect it in the first year the vehicle is available for business. You can switch to actual expenses later. The reverse is not always allowed. Claim Section 179 or bonus depreciation in year one and you are permanently on the actual expense method for that vehicle.⁷ The rule exists because the standard rate already contains depreciation, and double-counting would be too generous. Business owners who grab the big first-year write-off without realizing this end up tracking receipts for the life of the vehicle.

Leasing Instead of Buying

Lease a business vehicle and you deduct the business portion of the lease payments under the actual expense method. There is no separate depreciation deduction because you do not own the car. The IRS keeps lessees of expensive cars from doing better than owners through a “lease inclusion amount” added to income each year of the lease, based on the car’s fair market value at lease start.¹⁶ For most vehicles priced under about $62,000, the annual inclusion is small enough that leasing still yields a meaningful deduction.

Recapture When You Sell

Every dollar of depreciation you claimed comes back when you sell or trade the vehicle. If the sale price exceeds the vehicle’s adjusted basis (original cost minus accumulated depreciation), the difference is depreciation recapture under Section 1245, taxed as ordinary income at rates up to 37%. This covers depreciation taken through Section 179, bonus, and MACRS alike.

Consider the sting: buy a heavy SUV for $70,000, expense the full amount under Section 179 in year one, sell it three years later for $35,000. Adjusted basis is zero. The entire $35,000 is ordinary income. If you rotate vehicles often, factor recapture into the plan before reaching for the biggest possible first-year deduction.

1
Internal Revenue Service. 2025 Instructions for Schedule A (Form 1040)
2
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
3
Internal Revenue Service. Topic No. 503, Deductible Taxes
4
IRS.gov. Schedule A – Itemized Deductions
5
Internal Revenue Service. Instructions for Form 2106 (2025)
6
Internal Revenue Service. Clean Vehicle Tax Credits
7
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
8
Internal Revenue Service. Publication 587 (2025), Business Use of Your Home
9
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
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Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
11
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
12
Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles
13
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents
14
Internal Revenue Service. 2026 Standard Mileage Rates Notice 2026-10
15
Internal Revenue Service. Topic No. 510, Business Use of Car
16
Internal Revenue Service. Rev. Proc. 2026-15 – Lease Inclusion Amounts for Passenger Automobiles