Priority Dispatch LLC
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IFTA Fuel Tax Calculator

IFTA spreads your fuel tax across the states you drove in. Your fleet MPG (total miles divided by total gallons) sets how many gallons you used in each state. Tax is owed on those gallons at each state's rate, and you get credit for the tax you already paid at the pump in that state.

Miles, fuel and tax by state
StateMilesGallons boughtTax rate ($/gal)Taxable galTax due / (credit)Remove
370.9$0.00
278.2$0.00
200.9$0.00
Total miles5,500
Total gallons850
Fleet MPG6.47
Net tax due$0.00

Enter each state's diesel rate for the quarter from the official IFTA tax rate matrix to see tax owed. Rates change every quarter, so we do not prefill them.

Everything is calculated in your browser. Nothing you enter is stored or sent anywhere.

How to use it

  1. Add a row for each state you drove in this quarter.
  2. Enter the miles driven and the gallons bought in that state.
  3. Enter each state's diesel tax rate for the quarter from the IFTA tax rate matrix.
  4. Read the tax owed or credited per state and your net total.

Sources

Questions

Where do I find the IFTA tax rates?

IFTA, Inc. publishes the official tax rate matrix every quarter at iftach.org. Some states also add a surcharge; include it in the rate you enter.

Why do I get a credit in some states?

If you bought more fuel in a state than you burned there, you already paid more tax at the pump than you owe, so that state credits you the difference.

When is IFTA due?

IFTA returns are due by the last day of the month after each quarter: April 30, July 31, October 31 and January 31.

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