Free owner-operator tool
IFTA Fuel Tax Calculator
Estimate your quarterly IFTA fuel tax before you file. Enter the miles you ran and gallons you bought in each state, and we'll calculate your fleet MPG, taxable gallons, and what you owe or get credited — jurisdiction by jurisdiction.
Net taxable gallons: 112.3Owe $76.37
Net taxable gallons: -43.1Credit $11.63
Net taxable gallons: -69.2Credit $18.00
IFTA tax rates change every quarter and differ by state. The rates above are examples — replace each one with the current quarter's diesel rate for that jurisdiction from iftach.org.
Estimated net IFTA due
$46.74
you likely owe this quarter
Fleet MPG6.50
Total miles6,500
Total gallons purchased1,000
We divide your total miles by total gallons to get fleet MPG, then charge each state's tax rate on the gallons you burned there minus the gallons you bought there.
Estimate only — confirm with your base state IFTA filing.
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