The reimbursement formula, worked through
Mileage reimbursement is one multiplication once you have the two inputs sorted out:
Reimbursement = Distance × Rate per mile
Worked example: 120 miles driven for work at a rate of $0.67 per mile comes to 120 × $0.67 = $80.40.
The arithmetic is trivial — the real work is logging distance accurately and using the correct rate, since both employers and tax authorities typically expect a written record, not just a final total.
What a per-mile rate is actually meant to cover
A mileage rate isn't just fuel money — it's a bundled estimate covering fuel, depreciation, routine maintenance, tires, insurance, and registration, all folded into a single figure per mile. That's why standard rates typically run well above what fuel alone would cost per mile, and it's also why many tax authorities publish separate rates for business driving, medical or moving trips, and charitable driving — each reflecting a different mix of what's being covered.
Rates get revised periodically (often yearly) to track changing fuel and vehicle costs, so it's worth confirming the current rate for your country and tax year rather than relying on a number from an old bookmark.
Standard rate vs. tracking actual expenses
Most systems that offer a standard mileage rate also allow the alternative: keeping every actual receipt (fuel, repairs, insurance, depreciation) and claiming the real total instead. The standard rate exists specifically to avoid that bookkeeping burden — multiply distance by one published number instead of reconciling a drawer full of receipts. It tends to favor drivers with reasonably efficient, low-maintenance vehicles; someone running an expensive-to-maintain vehicle for extensive business travel might come out ahead tracking actual costs instead. Compare rates mode on this page is built for exactly that kind of side-by-side check between two candidate figures.
Keeping a mileage log that actually holds up
A reimbursement claim or tax deduction is only as good as the record behind it. A solid mileage log usually includes:
- The date of each trip
- Starting and ending odometer readings, or total distance for the trip
- The destination and business purpose
- The rate applied and resulting reimbursement amount
Logging trips as they happen — rather than reconstructing months of driving from memory later — is what actually holds up if a claim is ever questioned.
Related tools
This calculator focuses on reimbursement rates rather than fuel economy. If what you actually need is a road-trip fuel budget, the Fuel Cost Calculator handles that directly, and the Gas Mileage Calculator can work out your vehicle's real-world MPG from a fill-up.