Mileage Deduction Calculator
Compare the IRS standard mileage rate versus the actual expense method to determine which yields a larger deduction for business driving.
What Is the Mileage Deduction?
The IRS provides two methods for deducting business use of a personal vehicle. The Standard Mileage Rate method allows self-employed individuals to deduct a fixed per-mile rate -- 70 cents per mile for business driving in 2025 -- without tracking individual expenses like gas, insurance, and repairs. This rate is set annually by the IRS based on a study of fixed and variable costs of operating a vehicle. The Actual Expense Method requires tracking all vehicle operating costs (fuel, insurance, repairs, maintenance, depreciation, lease payments, registration, tires) and deducting the business-use percentage based on miles. You must use the standard mileage rate in the first year you use a vehicle for business if you want to use it in subsequent years; if you start with actual expenses, you can switch to standard mileage later (but not vice versa for leased vehicles). Additional deductions for parking fees and tolls are allowed under either method. Commuting miles (home to regular workplace) are never deductible, but travel from your home office to client sites is deductible if your home is your principal place of business.
How to Use This Calculator
Enter Business Miles
Input the total miles driven for business purposes during the tax year. Include client visits, supply runs, and job site travel. Exclude commuting.
Enter Total Annual Miles
Provide total miles driven for all purposes. The calculator computes your business-use percentage for the actual expense method.
Input Actual Vehicle Expenses
Enter total annual costs: gas, insurance, maintenance, repairs, registration, and car washes. The calculator applies the business percentage.
Compare Methods
The calculator shows both deductions side by side and recommends the method that yields the larger write-off.
Key Concepts
2025 Standard Rate: 70 Cents/Mile
The IRS rate covers gas, depreciation, insurance, maintenance, and repairs. Parking and tolls are deductible separately on top of the standard rate.
Mileage Log Requirement
The IRS requires contemporaneous records: date, destination, business purpose, and miles for each trip. Apps like MileIQ or Everlance automate this.
Commuting Is Never Deductible
Miles from home to your regular workplace are personal commuting. However, travel from a home office (principal place of business) to client sites is deductible.
First-Year Election
You must choose the standard mileage rate in the first year you use a vehicle for business to preserve the option. Starting with actual expenses locks you into that method.
Medical and Charity Rates
Medical/moving mileage is 22 cents/mile for 2025. Charitable driving is 14 cents/mile (set by statute at IRC Section 170(i), not indexed for inflation).
Expert Insights
Standard Rate Is Generous for Efficient Cars: The standard mileage rate at 70 cents per mile for 2025 is remarkably generous for drivers with newer, fuel-efficient vehicles. If your actual per-mile cost (total expenses divided by total miles) is less than 70 cents, the standard method produces a larger deduction. For a driver spending $8,000/year on a car driven 20,000 total miles (40 cents/mile actual cost), the standard method on 12,000 business miles yields $8,400 versus $4,800 under actual expenses.
When Actual Expenses Win: The actual expense method tends to win for expensive vehicles with high depreciation, heavy maintenance vehicles, or very high business-use percentages (over 80%). A $60,000 vehicle with $15,000 in annual expenses at 80% business use deducts $12,000 under actual expenses versus $8,400 at standard (12,000 miles x $0.70). The break-even depends on your specific numbers, which is why running both methods each year is essential.
Top Audit Trigger: The most common audit trigger for mileage deductions is inadequate recordkeeping. The IRS requires a contemporaneous log -- records made at or near the time of the trip. A spreadsheet reconstructed at year-end from memory will not survive an audit. Use a mileage tracking app that logs trips via GPS automatically.
Frequently Asked Questions
This calculator provides estimates for educational purposes only. Tax laws change frequently and individual circumstances vary. These estimates do not constitute tax advice. Consult a qualified CPA or tax professional before making tax-related decisions.
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