Employee vehicle-benefit guide
Compare company-car access with taxable cash and mileage reimbursement
Vehicle benefits use different tax and cash-flow rules. A company car can create taxable personal-use income, a flat allowance is generally cash compensation, and substantiated business mileage can be reimbursed under an accountable plan.
This calculator converts each option to an annual employee cost using the same personal driving assumptions. Employer policy and payroll treatment still control the actual result.
How to use this tool
Estimate the cost of owning the vehicle
Include payment or depreciation, insurance, maintenance, registration, parking, and fuel.
Separate business from personal miles
Use miles that meet your employer policy rather than commute miles automatically.
Enter payroll treatment
Use the taxable personal-use value for the company car and your marginal rate for the allowance.
Compare the cost and mileage threshold
The winner minimizes your annual employee cost; the threshold shows when mileage reimbursement overtakes the allowance.
Payment versus depreciation
A loan payment is useful for cash-flow planning but includes principal that builds vehicle equity. Depreciation better represents economic ownership cost. Choose one approach and use it consistently.
Accountable-plan treatment
Reimbursements can receive different tax treatment depending on documentation and employer policy. The model assumes the entered mileage reimbursement is substantiated and nontaxable.
Costs employees often miss
- Insurance changes required for business use.
- Parking, tolls, registration, tires, and unscheduled repairs.
- Company-car payroll deductions and taxable personal use.
- Employer mileage caps, excluded commute miles, and reimbursement delays.
Use the employer's written vehicle policy and payroll estimate. Tax treatment, commuting rules, substantiation, vehicle eligibility, and personal-use valuation can change the result.
Sources and further reading
- IRS Publication 463: Travel, Gift, and Car Expenses — Mileage, actual-expense, accountable-plan, and recordkeeping guidance.
Frequently asked questions
Is a car allowance taxable?
A flat allowance paid as wages is commonly taxable. Confirm the treatment on the offer and pay statement; this calculator applies your entered marginal income-tax rate.
Is mileage reimbursement always tax-free?
No. The result assumes substantiated reimbursement under an employer policy. Payments outside an accountable arrangement can be taxable.
Does the IRS mileage rate equal my real cost?
Not necessarily. Your cost per mile depends on depreciation or payments, insurance, maintenance, fuel, and annual mileage.
How do I value personal use of a company car?
Ask the employer for the annual taxable value and any personal contribution or fuel policy, then enter those amounts directly.