IFTA Tax Estimator

Estimate your quarterly IFTA fuel tax liability by state. Enter your miles driven and fuel purchased in each state.

Average Miles Per Gallon (MPG)

Average semi-truck: 5.5-7.0 MPG

Miles Driven & Fuel Purchased Per State

State

Miles Driven

Gallons Purchased

State

Miles Driven

Gallons Purchased

How IFTA Tax Works

IFTA (International Fuel Tax Agreement) is a tax agreement among US states and Canadian provinces. It ensures you pay the correct fuel tax based on where you drive, not just where you buy fuel.

Each quarter, you report total miles driven and fuel purchased per state. States with high tax rates where you drove a lot but bought little fuel will show a tax due. States where you purchased excess fuel will show a credit.

Pro tip: Buy fuel strategically in low-tax states (TX at $0.20/gal, MS at $0.18/gal) to reduce your IFTA liability. Avoid buying in high-tax states like PA ($0.576/gal) and CA ($0.68/gal) when possible.