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IFTA fuel tax calculator
Estimate your U.S. fleet’s miles per gallon, taxable gallons, and net fuel tax by jurisdiction. Enter the reporting period’s total fuel used, each jurisdiction’s total and taxable miles, tax-paid gallons, and current U.S. dollar rate per gallon.
Jurisdiction miles and fuel
Enter total and taxable miles in each jurisdiction. Total fuel used above determines fleet MPG.
Fleet MPG uses total miles across jurisdictions divided by total fuel used for the reporting period. Taxable gallons use taxable miles divided by fleet MPG, less tax-paid gallons in each jurisdiction. Taxable miles should not exceed total miles. This U.S. estimate excludes surcharge, interest, fees, and other base-jurisdiction adjustments.
Choose a base jurisdiction, quarter, and tax year; enter total fuel used; then enter miles, jurisdiction, and current rate for each active row.
IFTA calculator questions
How do I estimate IFTA fuel tax?
Enter all miles, taxable miles, total fuel used, and tax-paid gallons for the quarter, grouped by jurisdiction. This tool estimates fleet MPG from all miles and fuel used, then taxable gallons from taxable miles. Enter each jurisdiction’s current rate to estimate a due amount or credit.
What information do I need for an IFTA calculation?
You need the filing quarter, base jurisdiction, fuel type, all miles and taxable miles in each IFTA jurisdiction, total fuel used, tax-paid gallons purchased in each jurisdiction, and the applicable tax rate for that quarter.
Does this calculator file my IFTA return?
No. It is a planning estimate and does not submit a return. Your base jurisdiction’s official forms and instructions control filing, rounding, surcharges, and other adjustments.
Are the miles and fuel I enter stored?
No. The calculator runs in your browser and does not send your entries to a UFN account or server. Download the CSV if you want to keep your estimate.