Tax Rules for Company Cars: Valuation, Deductions, and Records

Company car tax rules split cleanly along one line: business use is tax-free to the employee and deductible for the employer, while personal use is taxable wages. The IRS treats an employer-provided vehicle as a fringe benefit, which means the personal-use portion runs through your W-2 and gets hit with federal income tax, Social Security, and Medicare. For 2026, the standard business mileage rate is 72.5 cents per mile, and the depreciation caps, weight thresholds, and reimbursement rules below decide how much tax each side actually pays.¹

What Counts as Personal Use

Gross income includes compensation in every form, and a company car is compensation. A separate rule lets employees exclude the value of use that serves the employer’s business, which the tax code calls a working condition fringe.² Business miles are tax-free. Everything else is personal, and the IRS treats it like cash wages.

Personal use includes commuting between home and your regular workplace, running errands, weekend trips, and any driving that doesn’t directly serve the employer. A brief personal stop between a business errand and home usually qualifies as de minimis and doesn’t add tax, but regular commuting never does.³ Without documentation splitting business from personal miles, the IRS can treat the full value of the vehicle as taxable compensation.

A boundary worth stating up front: you cannot deduct unreimbursed vehicle expenses on your personal return. The Tax Cuts and Jobs Act suspended that deduction in 2018, and the One Big Beautiful Bill Act made the elimination permanent. If your employer doesn’t reimburse you through a proper plan, you absorb the cost with no tax benefit.

The Three Valuation Methods

Once business and personal miles are separated, the employer assigns a dollar value to the personal portion. Publication 15-B provides three methods, and the choice determines what lands on your W-2.³

Cents-Per-Mile Rule

Multiply personal miles by 72.5 cents. Simple, but the employer can only use it if the vehicle’s fair market value was $61,700 or less when first made available to the employee.⁴ Drive 3,000 personal miles in a year and the taxable amount is $2,175.

Commuting Rule

If the vehicle is used only for commuting and minor personal stops, each one-way commute is valued at $1.50. Strict conditions apply. The employer must have a written policy prohibiting other personal use, the employee must follow it, and the employee cannot be a control employee. For 2026, that includes any officer earning $145,000 or more, any director, any employee earning $290,000 or more, and anyone with at least a 1% ownership stake.³ An employee with 240 round trips a year has $720 in taxable income under this rule.

Annual Lease Value Rule

For higher-value vehicles or use beyond commuting, employers look up the vehicle’s fair market value in an IRS table that maps FMV ranges to annual lease values. A vehicle worth $40,000 to $41,999 carries an annual lease value of $10,750. Multiply by the personal-use percentage. If 30% of miles are personal, the taxable amount is $3,225.

How the Value Hits Your Paycheck

Whichever method the employer picks, the resulting figure gets added to wages. It goes on Form W-2 in Box 1 (federal wages), Box 3 (Social Security wages), Box 5 (Medicare wages), and Box 14. Federal income tax, the 6.2% Social Security tax, and the 1.45% Medicare tax all apply. Employers can elect not to withhold income tax on the vehicle benefit itself, but you still owe the tax when you file.

Records That Hold Up in an Audit

The business-use exclusion depends on documentation. Federal law requires substantiation showing the amount, time and place, and business purpose of each trip.⁵ For every business trip, keep:

Odometer readings at start and end, or a GPS tracking app
Date of the trip
Destination
Business purpose (client meeting, job site, supply pickup)

Publication 463 explains that a contemporaneous log, created at or near the time of each trip, carries the most weight.⁶ Reconstructing months later is a weak position. If the records are missing or unreliable, the IRS can disallow the exclusion entirely and treat the full vehicle value as compensation.

What the Employer Can Deduct

The business deducts ordinary operating costs, including fuel, maintenance, repairs, insurance, and registration, as regular expenses under Section 162.⁷ Substantiation rules apply, so each expense needs a record tying it to business use.

For the vehicle itself, the business has two main tools. Section 179 lets a business deduct the full purchase price in the year the vehicle is placed in service, up to $2,560,000 for 2026. Bonus depreciation under Section 168(k) allows a first-year deduction equal to 100% of the remaining depreciable cost. The One Big Beautiful Bill Act permanently reinstated 100% bonus depreciation for qualified property acquired after January 19, 2025.⁸

Both tools are capped for passenger automobiles. That’s where things get restrictive.

Passenger Vehicle Depreciation Caps

Company cars are depreciated over a five-year recovery period.⁹ But for passenger automobiles, defined as four-wheeled vehicles rated 6,000 pounds gross vehicle weight or less, annual depreciation is capped regardless of what the car cost.¹⁰ These are commonly called the luxury auto limits, though they apply to most sedans, crossovers, and smaller SUVs.

For passenger automobiles placed in service in 2026 with bonus depreciation, the caps are:¹¹

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

Without bonus depreciation, the Year 1 cap drops to $12,300. The later years stay the same. For a $55,000 sedan, these caps mean the full cost won’t be recovered in the standard five years; the unrecovered basis carries forward at $7,160 per year until it’s used up.

The Heavy Vehicle Exception

Vehicles rated above 6,000 pounds GVWR fall outside the passenger automobile definition and escape the Section 280F caps. This is why fleet planners lean toward full-size pickups, cargo vans, and large SUVs. A qualifying heavy vehicle can potentially be deducted in full in Year 1 through a combination of Section 179 and bonus depreciation.

SUVs rated between 6,000 and 14,000 pounds carry a separate Section 179 cap. The base amount is $25,000, adjusted for inflation; for 2026 the adjusted figure is approximately $32,000. Cost above the cap can still qualify for 100% bonus depreciation, so a $70,000 heavy SUV can still be fully written off in Year 1. Pickups with beds at least six feet long and vans with no rear seating behind the driver fall outside the SUV definition and avoid the cap.¹²

Reimbursements and Accountable Plans

When employees use their own vehicles for business or pay company car costs out of pocket, the reimbursement structure decides whether those payments are taxable. An accountable plan keeps reimbursements tax-free for the employee and deductible for the employer. Three conditions must be met:¹³

Business connection: the expense relates to the employer’s business
Adequate accounting: the employee substantiates the expense within a reasonable time
Return of excess: any reimbursement above the substantiated amount is returned promptly

Miss one and the whole payment becomes taxable wages subject to income and payroll taxes. This structure matters more than it used to, because employees have no fallback deduction on their personal returns.

Selling the Vehicle

Sell a company car for more than its adjusted basis (original cost minus depreciation taken) and the gain triggers depreciation recapture. All prior depreciation, including Section 179 and bonus depreciation, is recaptured as ordinary income up to the amount of the gain.¹⁴ That’s taxed at the owner’s marginal rate, not at capital gains rates.

Any gain above the total depreciation taken is a Section 1231 gain and may qualify for long-term capital gains treatment. In practice, most company cars don’t appreciate, so the recapture piece is usually the entire gain. A business that took a large Year 1 deduction should expect a matching recapture hit at disposal, and it’s worth pricing that in when the vehicle is bought.

1
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents
2
Office of the Law Revision Counsel. 26 U.S. Code 132 – Certain Fringe Benefits
3
Internal Revenue Service. Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits
4
Internal Revenue Service. Notice 2026-10 – 2026 Standard Mileage Rates
5
Office of the Law Revision Counsel. 26 U.S. Code 274 – Disallowance of Certain Entertainment, Etc., Expenses
6
Internal Revenue Service. About Publication 463, Travel, Gift, and Car Expenses
7
Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses
8
Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System
9
Internal Revenue Service. Publication 946, How To Depreciate Property
10
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
11
Internal Revenue Service. Revenue Procedure 2026-15 – Passenger Automobile Depreciation Limitations
12
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
13
Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses
14
Internal Revenue Service. Publication 544, Sales and Other Dispositions of Assets