An employee’s personal use of a company vehicle is allowed only when the employer’s written policy permits it, and once permitted, the value of that personal use becomes taxable income and opens gaps in insurance and liability coverage that don’t exist when you’re driving for work. There’s no legal right to drive a company car off the clock. It’s a benefit your employer grants, defines, and can pull back.
Whether You Can Drive It Off the Clock
Permission comes from your employer, not from any law. Most companies spell out the terms in a vehicle use agreement or handbook, and those documents function as a contract: breaking the rules can cost you driving privileges, trigger discipline, or end the job.
Typical restrictions include:
- Geographic limits, such as a mileage radius or a bar on crossing state lines without approval.
- Authorized-driver rules that keep spouses, children, and friends out of the driver’s seat.
- Prohibited activities like towing personal trailers, hauling hazardous materials, or running side jobs.
- Fuel and maintenance terms — some employers make you reimburse fuel for personal miles, while others fold fuel into the benefit, which raises its taxable value.
If the policy says nothing about personal use, assume it isn’t allowed. Informal permission from a supervisor is thin protection if an accident happens on a personal trip, so ask for the rule in writing before you rely on it.
What Counts as Personal Use
The IRS draws a clean line. Business use is travel tied to your job — visiting clients, moving between work sites, hauling equipment. Personal use is everything else, and that includes your daily commute. Driving from home to your regular workplace is personal even if you take business calls or carry work materials with you.1Internal Revenue Service. Publication 15-B, Employer’s Tax Guide to Fringe Benefits The commute benefits you, not the employer.
One narrow exception is “de minimis” use: small, infrequent side trips that would be impractical to track. A coffee stop on the way back from a delivery, or a quick grocery run on the route home from a job site, generally qualifies. Routine errands and habitual detours do not.
The Tax Cost of Personal Use
Once you drive the vehicle for personal reasons, the value of that use is a taxable fringe benefit. Federal law folds fringe benefits into gross income, so the value adds to your wages.2Office of the Law Revision Counsel. 26 U.S.C. 61 – Gross Income Defined Your employer withholds federal income tax, Social Security, and Medicare on that amount through regular payroll. The IRS allows four ways to calculate it, and your employer picks which one fits.
General Valuation Rule
The default. Your employer figures what it would cost to lease a comparable vehicle in your area for a similar period, then allocates a share to your personal mileage.1Internal Revenue Service. Publication 15-B, Employer’s Tax Guide to Fringe Benefits
Cents-Per-Mile Rule
The employer multiplies the IRS standard mileage rate by your personal miles. For 2026 the rate is 72.5 cents per mile.3Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile The rate already covers maintenance and insurance. This method is available only if the vehicle’s fair market value when first made available for personal use is $61,700 or less for 2026, and the vehicle is regularly used for business or meets an IRS mileage test.4Internal Revenue Service. Notice 2026-10 – Standard Mileage Rates
Annual Lease Value Rule
For pricier vehicles, the employer looks up the fair market value on an IRS table to find an annual lease value, then multiplies by the percentage of miles you drove personally.5eCFR. 26 CFR 1.61-21 – Taxation of Fringe Benefits A $35,000 vehicle has an annual lease value of $9,250; if 30% of your miles were personal, $2,775 gets added to your wages.1Internal Revenue Service. Publication 15-B, Employer’s Tax Guide to Fringe Benefits
Commuting Valuation Rule
The simplest method values each one-way commute at a flat $1.50, regardless of distance.1Internal Revenue Service. Publication 15-B, Employer’s Tax Guide to Fringe Benefits An employee commuting 250 days a year would add $750 to taxable wages. All of these conditions must be met:
- The employer requires you to commute in the vehicle for a legitimate business reason, not as a perk.
- Written policy prohibits personal use beyond commuting and minor stops.
- You actually follow the policy.
- You aren’t a “control employee” — the IRS category that captures officers earning $145,000 or more, directors, employees earning $290,000 or more, and 1% owners for 2026. Control employees can’t use the $1.50 rule at all.6Internal Revenue Service. Notice 2025-67 – Retirement Plans and IRAs Cost-of-Living Adjustments5eCFR. 26 CFR 1.61-21 – Taxation of Fringe Benefits
Insurance and Liability Gaps
Personal driving in a company vehicle sits in a coverage seam. Knowing where the seam is beats finding out after a crash.
The Employer’s Commercial Policy
Commercial auto insurance covers business operations. Many policies include a permissive-use clause that extends coverage to authorized employees on personal trips, but it isn’t universal — some policies exclude personal use outright, others limit it. Confirm with the fleet manager or insurance coordinator before treating personal driving as covered.
Your Personal Auto Policy
Most personal auto policies exclude vehicles “furnished or available for your regular use” that you don’t own. If you routinely drive a company car home, your personal policy generally won’t pay liability, medical, or physical damage claims when you’re behind that wheel. An “extended non-owned coverage” endorsement can close the liability gap, but damage to the company vehicle itself typically stays outside your personal policy. If you total the car, the employer’s commercial policy is usually the only source of coverage for the vehicle, and its insurer may pursue a subrogation claim against you.
Who Pays When You Cause an Accident
Under respondeat superior, employers are generally liable for accidents their employees cause while working. A personal trip falls outside the scope of employment, so the employer’s liability shrinks and yours grows. Even where the commercial insurer pays the claim, it can seek reimbursement from you.
Workers’ Compensation
Workers’ comp covers injuries within the scope of your job. If you’re hurt while using the company vehicle for personal travel, including your regular commute, workers’ comp generally won’t apply. You’d fall back on your own health insurance and, if someone else was at fault, a personal injury claim. This is one of the more expensive gaps to discover after the fact.
Records You Need to Keep
Federal tax law requires records separating business miles from personal miles on any employer-provided vehicle. Without adequate documentation, the IRS can treat all of your use as personal, which makes the entire value taxable.7Office of the Law Revision Counsel. 26 U.S.C. 274 – Disallowance of Certain Entertainment, Etc., Expenses The regulations expect a log — notebook, spreadsheet, or app — with entries made at or near the time of each trip,8eCFR. 26 CFR 1.274-5 – Substantiation Requirements capturing:
- Date of the trip.
- Starting and ending odometer readings or total miles.
- Purpose — business or personal, with a brief description of the business errand if applicable.
- Destination, and for business trips who you saw or what you did.
Many employers now run GPS-based fleet tracking that logs the data automatically, but accuracy still falls to the driver. Solid records are what keep the business portion of your driving out of your taxable wages.
Vehicles That Don’t Trigger Personal-Use Income
Some employer-provided vehicles fall outside these rules entirely because their design makes routine personal use impractical. These “qualified nonpersonal use vehicles” — cargo vehicles over 14,000 pounds loaded, dump trucks, cement mixers, cranes, bucket trucks, forklifts, farm tractors, delivery trucks with seating only for the driver, and clearly marked emergency vehicles — produce no taxable personal-use income and are exempt from the mileage-log requirement.9Office of the Law Revision Counsel. 26 U.S.C. 132 – Certain Fringe Benefits10eCFR. 26 CFR 1.274-5 – Substantiation Requirements Pickups and vans don’t automatically qualify; they need permanent modifications like fixed interior shelving, removed rear seating, and company branding before they count. If you drive an ordinary company car, sedan, SUV, or unmodified truck, the tax and insurance rules above apply.