Vehicle Deduction Calculator
Compare the standard-mileage and actual-expense methods with the current rates (72.5¢/mi for 2026) and see which deduction wins for your vehicle.
Written by Dorothy Ibrahim, 10+ years in banking & finance
Reviewed by Benton Jona, EA (Enrolled Agent) — 2026-07-13
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How we calculate this
This calculator compares the two ways to deduct business vehicle use — the standard mileage rate and the actual-expense method — using the current IRS rates: $0.725 per business mile for 2026 (IRS Notice 2026-10) and $0.70 for 2025. Many competing calculators still show rates from years ago. Enter your miles and running costs and it shows both deductions side by side, names the winner, and estimates the tax saved at your marginal rate.
The formulas
- Business-use percentage
- business miles ÷ total miles driven
- Standard mileage deduction
- business miles × standard mileage rate ($0.725/mi for 2026; $0.70/mi for 2025)The rate bundles fuel, insurance, repairs, and depreciation into one figure — you cannot also deduct those separately.
- Actual-expense deduction
- (fuel + insurance + repairs + registration + lease payments or depreciation) × business-use percentage
- Winner and tax savings
- the larger of the two methods; tax savings = winning deduction × your marginal rate
Worked example
- Take the defaults: 12,000 business miles out of 18,000 total (66.7% business use), with $3,000 fuel, $1,800 insurance, $1,200 repairs, $300 registration, and $4,000 of lease/depreciation, at a 30% marginal rate, tax year 2026.
- Standard mileage = 12,000 × $0.725 = $8,700.
- Actual expenses total $10,300; at 66.7% business use the deductible share is $6,866.67.
- Standard mileage wins by $1,833.33 — worth about $2,610 in tax at a 30% marginal rate.
- For basis tracking, $0.35 of each 2026 business mile counts as depreciation ($0.33 for 2025), which reduces the vehicle's basis for a future sale.
Rates, benchmarks & sources
- Standard mileage rates: $0.725/mi for 2026, $0.70/mi for 2025, and the depreciation-equivalent components (35¢ and 33¢ per mile) used for basis tracking — IRS Notice 2026-10 (2026), Notice 2025-05 (2025)
- The luxury-auto first-year depreciation cap with bonus (~$20,400 for 2026, GVWR over 6,000 lb exempt) is carried in our config as an approximate, litigation- and guidance-dependent figure — Provisional — verify at build
Figures current as of 2026-07-02. See our methodology & editorial standards for how constants are versioned and verified.
What this tool doesn’t model
- The ~$20,400 (2026) luxury-auto year-1 cap shown as a helper is provisional and flagged verify-at-build in our config — the tool warns when your depreciation input suggests it applies but does not enforce it.
- Federal only — state add-backs and different state depreciation rules are not modeled, and the output is an estimate, not filing advice.
- Parking and tolls (deductible on top of either method) and interest on a vehicle loan are not included in the comparison.
- The actual method's depreciation is whatever you enter — the tool does not compute MACRS or bonus depreciation for the vehicle or apply the under-50%-business-use restriction to your figure (it only warns).
- It compares a single year; the method-switching rules mean the lifetime-optimal choice can differ from this year's winner.
Frequently asked questions
Which method usually wins?
As a pattern: standard mileage favors high-mileage, inexpensive-to-run vehicles, because 72.5¢ per 2026 mile can exceed the true per-mile cost of an economical car. Actual expenses favor expensive vehicles driven relatively few business miles, where insurance, lease payments, and depreciation dwarf what the mileage rate returns. The defaults show a typical case — the mileage method winning by about $1,833 — but the answer flips with your numbers, which is why the tool computes both.
Can I switch between methods from year to year?
Only in one direction, and only if you start correctly. Using the standard mileage rate in the vehicle's first business year preserves the right to switch between methods later (with straight-line depreciation after a switch). Choosing actual expenses in year 1 locks that vehicle into the actual method for its whole business life. That first-year choice is worth making deliberately, not by default.
What records do I need to survive an audit?
A contemporaneous mileage log is the core requirement for either method: date, destination, business purpose, and miles for each trip, plus the odometer-based total for the year. The IRS routinely disallows vehicle deductions reconstructed after the fact. If you use the actual method you also need receipts for fuel, repairs, insurance, and the purchase or lease documents supporting depreciation.
Does commuting count as business miles?
No — driving between home and a regular workplace is nondeductible commuting, no matter how far. Business miles are trips between work locations, out to clients or suppliers, and business errands. One useful exception: with a qualifying home office as your principal place of business, trips from home to client sites generally count as business miles rather than commuting.
Is this my full vehicle tax picture, including state taxes?
No — this is a federal estimate of one deduction. State income-tax treatment can differ (some states decouple from federal depreciation), sales tax and registration fees on the purchase are separate matters, and the luxury-auto depreciation caps for expensive vehicles are approximated with a provisional figure rather than enforced. Treat the result as planning guidance, not filing advice.
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themoneysheet provides educational estimates, not financial, tax, or legal advice. Figures use published rates and formulas current as of the date shown, but your situation may differ. Consult a qualified professional (CPA, attorney, or licensed advisor) before making financial decisions. Federal figures only unless noted. State taxes vary.