IFTA Fuel Tax Filing: What Interstate Truckers Need to Know

What Is IFTA?

IFTA (International Fuel Tax Agreement) is a fuel tax sharing agreement among U.S. states and Canadian provinces. In simple terms, the fuel tax you owe is proportional to how many miles you drove in each jurisdiction and how much fuel you consumed there.

You don't have to register and file separately in each state — just register with IFTA through your base jurisdiction, file quarterly, and your base state handles the settlements with other jurisdictions.

Who Needs to File?

You must register for IFTA if your vehicle meets both conditions:

1. Has two axles and a gross weight over 26,000 pounds, or has three or more axles regardless of weight
2. Operates in two or more IFTA jurisdictions

How Is It Calculated?

The core formula is straightforward:

1. Track miles driven in each state
2. Track fuel purchased in each state
3. Calculate your average fuel consumption (total miles ÷ total gallons)
4. Use the average to determine how much fuel you "should have" consumed in each state
5. Compare against actual fuel purchased there → the difference is what you owe or get refunded

Filing Schedule

• Quarterly filing: Four quarters per year (Q1: Jan-Mar, Q2: Apr-Jun, Q3: Jul-Sep, Q4: Oct-Dec)
• Due dates: End of the month following the quarter (Q1 → Apr 30, Q2 → Jul 31, Q3 → Oct 31, Q4 → Jan 31)
• Late filings incur penalties and interest

Record Keeping

IFTA requires you to retain the following records for at least 4 years:

• Date, location, gallons, and amount for every fuel purchase
• Trip origin, destination, states traveled through, and mileage
• Vehicle VIN and plate information

Practical Tips

1. Use an ELD (Electronic Logging Device) to automatically track miles by state
2. Keep every fuel receipt — or photograph them with your phone
3. Don't wait until quarter-end to organize — spend a few minutes each week keeping records current
4. If you use a fuel card, many providers can export IFTA-formatted reports

FAQ

When do I need to register for IFTA?

If your vehicle has two axles and a gross weight over 26,000 pounds (or three or more axles regardless of weight) and operates in two or more IFTA jurisdictions, you must register.

How is the IFTA tax amount calculated?

You calculate your average fuel consumption (total miles ÷ total gallons), use that to figure out how much fuel you "should have" consumed in each state, then compare it against what you actually purchased there — the difference is what you owe or get refunded.

How often do I file, and what are the deadlines?

You file quarterly, four times a year, with due dates of April 30, July 31, October 31, and January 31 of the following year. Late filings incur penalties and interest.

How long do I need to keep IFTA records?

At least 4 years, including the date, location, gallons, and amount for every fuel purchase, plus trip origin, destination, states traveled, and mileage.

What can make IFTA record-keeping easier?

An ELD automatically tracks miles by state, photographing fuel receipts helps you stay organized, and many fuel cards can export reports already formatted for IFTA.

This article is general tax education and does not constitute personalized tax advice. Please consult a qualified tax professional for your specific situation.