Free tool
IFTA calculator
Work out what you owe or get back in each state before you file your quarterly return.
| State | Miles | Gallons bought | Tax rate ($/gal, optional) | Taxable gallons | Net gallons | Tax due |
|---|---|---|---|---|---|---|
| — | — | — | ||||
| — | — | — | ||||
| — | — | — | ||||
| — | — | — | ||||
| — | — | — | ||||
| — | — | — |
Estimated net tax (for rows with a rate)—
Total miles—
Total gallons—
Fleet MPG—
How to use it
Enter the miles you drove and the gallons you bought in each state this quarter. The tool finds your fleet MPG, then taxable gallons for each state (miles ÷ MPG). Positive net gallons usually mean tax owed; negative means a credit.
Fuel tax rates change every quarter, so type in the current rate for each state from the official IFTA rate table to estimate tax. Your base state's return is the final word. Need it filed? See IFTA filing.
Questions carriers ask
Where do I find current IFTA tax rates?
IFTA, Inc. publishes the rate matrix each quarter at iftach.org.
Do I file if I didn't drive?
Yes. IFTA licensees file every quarter, even with zero miles.