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Free IFTA fuel tax calculator
Enter the miles driven and gallons bought in each state for the quarter, plus each state's current tax rate per gallon. We work out your fleet MPG, taxable gallons and what you owe or get back.
| State | Miles | Gallons bought | Tax rate ($/gal) | Taxable gal | Tax due / (credit) | |
|---|---|---|---|---|---|---|
| 0.0 | $0.00 | |||||
| 0.0 | $0.00 | |||||
| 0.0 | $0.00 |
Total miles
0
Fleet MPG
—
Net tax due
$0.00
This is an estimate. IFTA rates change every quarter and some states add surcharges — check current rates at iftach.org before filing with your base state.
How IFTA is calculated
1. Divide total miles by total gallons to get fleet MPG. 2. For each state, divide miles driven there by MPG to get taxable gallons. 3. Subtract gallons bought in that state. 4. Multiply by the state's rate. A positive number is owed; a negative number is a credit.
Stop doing IFTA by hand
Rigmatix logs miles by state and fuel receipts from every load, then builds your quarterly report. Single Driver is $24.99/month for a limited time.