IFTA is filed quarterly. Due dates are April 30, July 31, October 31, and January 31. The Q2 2026 return (April–June) is due July 31, 2026.

How do I calculate IFTA tax?

Total your miles and gallons across all jurisdictions to get fleet MPG. For each state, taxable gallons = miles there ÷ MPG; net taxable gallons = taxable minus gallons purchased there; tax = net taxable × that jurisdiction's quarterly rate. Sum for total owed or credit.

Is this IFTA calculator free?

Yes — it is completely free with no signup required to calculate your quarterly IFTA reconciliation.

Free IFTA Calculator — Reconcile Your Quarterly Fuel Tax in Minutes

Q: Which states have an IFTA surcharge?

Indiana, Kentucky and Virginia publish Schedule-2 surcharges for certain fuels. In the loaded Q2 2026 matrix, Indiana’s $0.61 surcharge applies to propane only.

01

Your quarter & fuel

IFTA is filed quarterly. The quarter due July 31, 2026 is Q2 2026 (Apr–Jun).

Filing quarter

Fuel type

02

Miles & gallons by jurisdiction

Add each state/province you drove in. Enter total miles driven there and total fuel gallons purchased there.

Add a jurisdiction

Jurisdiction	Miles	Gallons purchased	Remove
No jurisdictions added yet. Pick one above and hit “Add”.

03

Your reconciliation

Total miles

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Total gallons

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Fleet MPG

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Jurisdiction	Taxable gal	Tax-paid gal	Net taxable	Rate	Tax / (credit)

This is a reconciliation worksheet, not a filed return, and not tax or legal advice. Figures are estimates to help you check your numbers — transcribe them into your base jurisdiction’s official IFTA return to file. Always verify current rates at iftach.org. IFTA rules require actual recorded mileage (no estimates) and retained fuel receipts.

Get a heads-up before each deadline

We’ll email a reminder 2 weeks before each IFTA due date. Your worksheet stays in this browser; use Print or Copy above to save it. No spam.

Submitting sends only your email, the source label and selected quarter for deadline reminders. Your worksheet never leaves this browser. Privacy & Terms.

IFTA, quick answers

The basics owner-operators ask every quarter.

When is IFTA due?

Quarterly — April 30, July 31, October 31, January 31. The Q2 2026 return (April–June) is due July 31, 2026.

How is IFTA tax calculated?

Total your miles and gallons everywhere to get fleet MPG. For each state: taxable gallons = miles there ÷ MPG; net taxable = taxable − gallons bought there; tax = net taxable × that state's quarterly rate. Negative means a credit. This tool does all of it for you.

Which states have a surcharge?

Indiana, Kentucky and Virginia publish Schedule-2 surcharges for certain fuels. In the loaded Q2 2026 matrix, Indiana’s $0.61 surcharge applies to propane only. The calculator applies each published fuel-specific surcharge automatically.

What do I need to use it?

Your total miles and fuel gallons per state for the quarter — from your trip sheets, ELD/GPS, and fuel receipts. Enter them above and you get a per-jurisdiction reconciliation you can print or copy.

Estimates only — always confirm current rates and file through your base jurisdiction. Not tax or legal advice.