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Tools

Free IFTA fuel tax calculator

Quick quarterly estimate. Enter total miles + total gallons + average tax rate; we compute fleet MPG and indicative tax base. Use the full calculator for the real per-state breakdown.

Quarterly estimate

Fleet MPG
6.67
Consumed (gal)
3,000
Estimated tax base
$960.00

This is a rough estimate using the average tax rate you provide. Actual IFTA owed depends on per-jurisdiction tax rates and jurisdiction-by-jurisdiction miles. Use the full IFTA calculator for the real per-state breakdown.

Sources

  • International Fuel Tax Agreement (IFTA) — IFTA, Inc. governance
  • 49 USC §14302 — IFTA federal authorization
FAQ

Common questions, plainly answered.

Fleet MPG is total miles driven divided by total gallons of diesel purchased across all vehicles in your IFTA-registered fleet for the quarter. The IFTA audit math uses fleet MPG to apportion total gallons consumed across each jurisdiction's mileage.

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