IFTA Fuel Tax Calculator (Quarterly)

IFTA tax per jurisdiction = (miles in that jurisdiction ÷ fleet MPG − tax-paid gallons bought there) × that jurisdiction's rate. Fleet MPG is total miles ÷ total gallons for the quarter.

Total gallons bought this quarter (all jurisdictions)

Enter each jurisdiction: miles driven, tax-paid gallons bought there, and the current rate from the IFTA tax rate matrix (we never prefill rates).

Jurisdiction	Miles	Tax-paid gallons	Rate ($/gal)

Net tax due (+) or credit (−)

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Who files IFTA

A qualified motor vehicle under IFTA has two axles and a gross or registered weight over 26,000 lb, or three or more axles, or is a combination over 26,000 lb, and runs in two or more member jurisdictions. Quarterly returns are due the last day of the month after each quarter (April 30, July 31, October 31, January 31). File with your base jurisdiction. Rates change quarterly: use the official IFTA rate matrix. Some jurisdictions add surcharges, so confirm on your return. Source: IFTA, Inc.