IFTA Filing Guide & 2026 Deadlines

What Is IFTA?

IFTA — the International Fuel Tax Agreement — is a compact between 48 U.S. states and 10 Canadian provinces that simplifies fuel tax reporting for commercial carriers who cross state lines. Instead of registering and filing separately in every jurisdiction you operate in, you file one quarterly return with your base state (for most North Dakota drivers, that's ND). Your base state then redistributes the tax to the states you ran in based on your reported miles and fuel purchases.

You qualify if you operate a vehicle with a gross vehicle weight over 26,000 lbs, or a vehicle with three or more axles, that crosses state lines for commercial purposes. If you run interstate, you almost certainly need an IFTA license.

2026 Quarterly Filing Deadlines

• Q1 (January–March): due April 30, 2026
• Q2 (April–June): due July 31, 2026
• Q3 (July–September): due October 31, 2026
• Q4 (October–December): due January 31, 2027

File even if you didn't run during a quarter. A non-operation return prevents a failure-to-file penalty. Late filing means a $50 penalty or 10% of the net tax due — whichever is greater — plus interest on any unpaid amount.

What You Need to File

IFTA is a math problem built from two numbers: miles driven by state and gallons purchased by state. You calculate your fleet average MPG, then figure out the theoretical gallons consumed in each state versus the actual gallons you purchased there. States where you burned more than you bought generate a tax due; states where you bought more than you burned generate a credit.

That means you need to track:

• Total miles per jurisdiction per truck — broken down by every state you passed through
• Fuel receipts or fuel card reports showing gallons and the state of purchase for every fill-up
• Odometer readings or ELD reports to back up your mileage

Mileage Tracking: ELD vs. Manual Log

If you're on an ELD, most systems can export state-by-state mileage reports that plug directly into your IFTA return. That's the cleanest setup. If you're exempt from ELD requirements (older trucks, short-haul exemption, etc.), you'll need a manual trip log that records the odometer reading at every state line crossing.

Missing or estimated mileage is the number-one cause of IFTA audits. Auditors look for round numbers and patterns that don't match typical routes. Keep your receipts and logs for four years — that's the standard IFTA audit window.

Common Mistakes That Trigger Penalties

Missing quarters. Even if you didn't turn a wheel, you owe a $0 return. Skip it and you get a penalty anyway.

Losing fuel receipts. If you can't document a fuel purchase, you can't claim the gallons — which inflates your calculated fuel consumption and increases what you owe. Fuel cards solve this automatically.

Forgetting deadhead or bobtail miles. All miles matter, not just loaded miles. If you drove it, log it.

Getting the math wrong. IFTA calculations are straightforward but tedious. One decimal place off on your fleet MPG affects every state on the return. Errors get caught in audits.

Filing in the wrong base state. Your IFTA base state should be the state where your truck is registered, where you have an established place of business, or where your records are kept. If you moved to North Dakota but are still filing in another state, fix that before your next return.

IFTA in QuickBooks

QuickBooks doesn't calculate IFTA returns automatically, but it's the right place to track the fuel purchases that feed into your return. Set up a Fuel Expense account and record every fill-up with the state in the memo field. When it's time to file, you'll have a clean expense history to cross-reference against your ELD mileage report.

On the Accounting by Jay trucking plan, we track your fuel and mileage throughout the quarter, calculate the return, and hand it to you to review and submit. No scramble in the last week of October. No digging for receipts from three months ago.

North Dakota IFTA Specifics

North Dakota IFTA licenses are administered by the ND Department of Transportation Motor Carrier Services. You file at dot.nd.gov or through ND's online portal. License renewal happens annually in December. If you're new to North Dakota or starting your authority here, apply for your IFTA license before you start running — operating without one is a violation subject to fines.

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General information, not tax or legal advice — see our disclaimer.