How this instrument works
Reimbursing someone for business driving is usually a single multiplication: miles driven times an agreed rate per mile. The IRS publishes a standard mileage rate each year that businesses commonly use for exactly this purpose — a single per-mile figure meant to cover the full cost of operating a vehicle for business use, not just the fuel it burns. That rate factors in fuel, but also depreciation, maintenance, insurance, and other ownership costs bundled into one number, which is why it runs noticeably higher than fuel cost alone would suggest.
This calculator defaults to the IRS's rate for the second half of 2026 — 76 cents per mile, effective July 1, 2026, up from 72.5 cents per mile for the first half of the year. The IRS occasionally adjusts its standard rate mid-year like this when driving costs shift meaningfully, rather than only revising it once annually, so it's worth confirming which half-year rate applies to the miles you're actually calculating.
The rate field is fully editable, because not every context uses the IRS figure — some employers set their own reimbursement rate, some states use a different rate for state-employee travel, and some contexts (like a personal budgeting estimate rather than a tax deduction) might use a different per-mile cost entirely. Enter whatever rate actually applies to your situation.
- Enter Miles driven — the total business miles for the trip or period you're calculating.
- Enter Rate per mile ($) — defaults to the IRS's current standard mileage rate, but edit it if a different employer, state, or historical rate applies.
- Read Total ($) for the resulting dollar reimbursement or deduction value.
- Double-check which half-year IRS rate applies if your mileage spans a rate change — the IRS has adjusted its rate mid-year before, not just annually.
- Keep a mileage log with dates and purpose for any miles you plan to claim as a tax deduction — the IRS requires contemporaneous records to support a mileage deduction.
Worked example — 500 business miles at the 2026 H2 IRS rate
Someone drives 500 miles for business over several trips in the second half of 2026, when the IRS's standard mileage rate is 76 cents per mile (effective July 1, 2026). Entering 500 for Miles driven and 0.76 for Rate per mile ($) gives Total ($) = 500 x 0.76 = $380.00.
That $380 is the figure they'd claim as a mileage deduction on a tax return, or the amount an employer using the IRS rate as its own reimbursement policy would owe them — either way, a single number covering fuel, wear, depreciation, and other per-mile ownership costs bundled into the IRS's published rate, not fuel cost alone.
Questions
What is the IRS standard mileage rate, and what does it cover?
It's a per-mile rate the IRS publishes for business use of a personal vehicle, meant to approximate the full cost of operating that vehicle — fuel, maintenance, depreciation, insurance, and other ownership costs — combined into a single figure, rather than reimbursing fuel cost alone. For 2026, the rate is 72.5 cents per mile for the first half of the year and 76 cents per mile from July 1 onward, per the IRS's published standard mileage rates.
Why did the rate change partway through 2026?
The IRS typically sets its standard mileage rate annually, but occasionally issues a mid-year adjustment when the underlying cost of operating a vehicle shifts meaningfully within the year, as it did effective July 1, 2026 (raising the rate from 72.5 to 76 cents per mile). Because of that, it's worth checking which half-year rate applies before calculating mileage that spans the change.
Do I have to use the IRS rate, or can I use a different one?
The Rate per mile ($) field is fully editable — the IRS figure is just the default, since it's the most commonly referenced rate for US business mileage. Many employers set their own internal reimbursement rate (sometimes matching the IRS figure, sometimes not), and other contexts, like a personal fuel-cost estimate rather than a tax deduction, may call for an entirely different per-mile figure.
Is the standard mileage rate the only way to deduct vehicle expenses on taxes?
No — taxpayers can generally choose between the standard mileage rate (a flat per-mile figure, which is what this calculator uses) and the actual-expense method, which totals real costs like gas, repairs, insurance, and depreciation and applies the business-use percentage to that total instead. Which method produces a larger deduction depends on the specific vehicle and its actual costs; consult a tax professional or the IRS's own guidance for which approach fits your situation.
Does this rate apply to commuting to a regular workplace?
No — ordinary commuting between home and a regular workplace generally isn't deductible business mileage under IRS rules, regardless of the rate used. The standard mileage rate applies to business-related driving beyond ordinary commuting, such as travel between job sites, client visits, or business errands — check current IRS guidance for what specifically qualifies.