IFTA Fuel Tax Calculator
Estimate your quarterly IFTA return: taxable gallons, tax due and fuel-tax credit for each state, and the net you'll owe or get back.
| Jurisdiction | Miles | Gallons bought | Tax rate ($/gal) | Taxable gal | Net | |
|---|---|---|---|---|---|---|
| 354.6 | — | |||||
| 177.3 | — | |||||
| 118.2 | — |
Rates change every quarter. Enter each jurisdiction's rate for the quarter (including any surcharge) from the IFTA tax rate matrix. Enter every jurisdiction you drove in, even where you bought no fuel.
Getting the inputs right
Use miles by jurisdiction from your ELD or GPS, and only tax-paid gallons from fuel receipts. Every mile counts — loaded, empty and bobtail — including toll-road miles.
Keep the receipts and trip records for at least four years; IFTA audits look back that far.
Questions truckers ask
How is IFTA calculated?
Divide total miles by total gallons to get your fleet MPG. For each jurisdiction, taxable gallons = miles driven there ÷ fleet MPG. Tax due = taxable gallons × that jurisdiction's rate; tax paid = gallons you bought there × the same rate. The difference is what you owe (or are credited) for that jurisdiction, and your return nets them all.
When are IFTA returns due?
The last day of the month after each quarter: April 30, July 31, October 31 and January 31. If the date falls on a weekend or holiday it moves to the next business day. File even if you had no miles.
Who needs IFTA?
Carriers running qualified motor vehicles across state or provincial lines — two axles and over 26,000 lbs, three or more axles at any weight, or a combination over 26,000 lbs. Alaska, Hawaii and DC aren't IFTA members.
Why do I need to enter the tax rates?
IFTA rates are set by each jurisdiction and published quarterly, and several states add surcharges. Using the exact rate matrix for your quarter keeps the estimate honest.
Estimates for planning only — not tax, legal or financial advice.