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IFTA Quarterly Fuel Tax Calculator

Add your miles driven and fuel purchased in each state for the quarter. This calculator figures your average MPG, gallons consumed per state, and net IFTA tax owed or credit due.

Add State Trips

Enter one row per state. If you drove through a state without buying fuel, enter 0 for gallons purchased. If you bought fuel in a state you didn't drive through, enter 0 for miles.

No trips added yet. Use the form above to add your quarterly mileage and fuel purchases by state.
Tax rates shown are approximate 2024 Q4 rates per gallon for diesel. Rates change quarterly — verify with your base jurisdiction before filing. This tool is an estimator only and does not constitute tax filing. Nothing is stored or sent anywhere.
IFTA Summary

How IFTA Works

IFTA (International Fuel Tax Agreement) lets multi-state carriers file one quarterly fuel tax return with their base state instead of filing separately in every state they operate in. Your base state then distributes tax payments to the states you owe.

The math: calculate your fleet average MPG for the quarter. Then figure how many gallons you "consumed" in each state based on miles driven there divided by your average MPG. Subtract gallons you actually purchased in that state. If you consumed more than you bought, you owe tax on the difference. If you bought more than you consumed, you get a credit.

IFTA members include all 48 contiguous US states plus 10 Canadian provinces. Hawaii, Alaska, and DC are not IFTA members (fuel taxes in those jurisdictions are handled separately).

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