IFTA Tax Calculator
Enter your miles and fuel purchases by state to calculate your IFTA tax liability or refund. Uses 2026 tax rates.
| State | Miles Driven | Fuel Gallons | Fuel Cost ($) | |
|---|---|---|---|---|
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Learn About Our IFTA ServiceHow This Calculator Works
1. Fleet Average MPG: We calculate your fleet's average miles per gallon by dividing your total miles by total fuel gallons across all jurisdictions.
2. Taxable Gallons: For each state, we divide the miles you drove there by your fleet average MPG to determine how many gallons of fuel you "consumed" in that state.
3. Tax Owed: Taxable gallons multiplied by the state's fuel tax rate.
4. Fuel Credit: Actual gallons purchased in that state multiplied by the state's tax rate (you already paid tax at the pump).
5. Net: Tax owed minus fuel credit. Positive means you owe that state. Negative means you get a credit (refund).