IFTA Quarterly Filing Deadlines: When Your Fuel-Tax Return Is Due

By Crossroads Technologies, published on Big Rig Math. Last reviewed . Sources and method

Your IFTA fuel-tax return is due four times a year, on the last day of the month right after each quarter ends. That fixes the deadlines at April 30, July 31, October 31, and January 31. The one exception: a licensee that runs fewer than 5,000 miles in 12 consecutive months outside its base jurisdiction can ask the base jurisdiction for permission to file annually instead (R930.200), and an approved annual return is due January 31 (R960). The quarter-end pattern is the same every year, but a due date that falls on a Saturday, Sunday, or legal holiday moves to the next business day (R960.100): for example, the third-quarter 2026 return is due Monday, November 2, 2026, and the fourth-quarter 2026 return is due Monday, February 1, 2027. When you are ready to work out what you actually owe or are credited for the quarter, the IFTA fuel-tax calculator on this site does the per-jurisdiction arithmetic for you.

The four deadlines

Quarter Months it covers Return due
Q1 January, February, March April 30
Q2 April, May, June July 31
Q3 July, August, September October 31
Q4 October, November, December January 31

Deadlines per the International Fuel Tax Association (IFTA, Inc.) rule that a quarterly return is due the last day of the month following the close of the quarter. See the official IFTA, Inc. site and your base jurisdiction for the current forms and any change. If the last day of the month falls on a Saturday, Sunday, or legal holiday, the next business day is the due date.

You file for the quarter that just ended

The single most common mix-up is filing for the wrong quarter. You always report the quarter that has just closed, not the one you are in. In early April you are filing for January through March; in early July for April through June; in early October for July through September; and in January for the previous October through December. The month of lead time exists so you can gather the two records the return is built on: the miles you ran in each jurisdiction, and the gallons of fuel you bought in each jurisdiction.

A zero-mile quarter still needs a return

IFTA is a licensing agreement, not a pay-as-you-go tax, so the obligation is to file every quarter your license is active, even one where the truck never turned a wheel. A quarter with no activity is reported as a zero return. Skipping it because you owe nothing is one of the fastest ways to draw a penalty for a quarter that would otherwise have cost you nothing, and a pattern of missing returns can put your license and decals at risk. If you run seasonally, either file the zero returns on time or ask your base jurisdiction how to mark the account inactive.

What the return actually asks for

Every IFTA return comes down to four inputs per jurisdiction you traveled in: total miles, taxable miles, gallons purchased, and the jurisdiction's tax rate for that quarter. The rate is the part that goes stale, because each member jurisdiction sets its own rate and can change it every quarter, which is why no honest calculator bakes rates in. You copy the current rate from the official IFTA quarterly tax-rate matrix and supply it; the arithmetic, which does not change, does the rest.

That is exactly how the IFTA calculator here works: it averages your fleet miles per gallon across all jurisdictions, converts your miles in the jurisdiction you are working on into the gallons you burned there, subtracts the tax-paid gallons you bought there, and multiplies the difference by the rate you enter. A positive result is tax owed to that jurisdiction; a negative result is a credit, because you already paid tax on fuel you carried out of the state.

Where this fits

Filing on time is half the job; filing the right number is the other half. Once you have your quarter's mileage and fuel totals in front of you, run them through the IFTA fuel-tax calculator to see the amount per jurisdiction before you transcribe it onto the return. If you are also pricing loads around fuel, the truck fuel cost calculator and the cost-per-mile calculator use the same mileage and fuel numbers you are already pulling together for IFTA. Start from the Big Rig Math home page to reach every tool.

IFTA deadline questions, answered

When is the IFTA return due?
An IFTA return is filed once a quarter, and each one is due on the last day of the month right after that quarter ends. That puts the four deadlines at April 30 for the first quarter, July 31 for the second, October 31 for the third, and January 31 for the fourth. If the last day of the month falls on a Saturday, Sunday, or legal holiday, the next business day is the due date (IFTA Articles of Agreement R960).
Do I have to file if I did not run any miles that quarter?
Yes. IFTA requires a return for every quarter your license is active, even a quarter with zero miles and zero fuel. That is called a zero return, and skipping it is treated the same as a late or missing return. If your operation is seasonal, file the zero returns on time or ask your base jurisdiction about the process for an inactive account.
What happens if I file late?
A late or unfiled IFTA return generally triggers a penalty plus interest that accrues per jurisdiction until the balance is paid, and a pattern of late filing can put your IFTA license and decals at risk. The exact penalty and interest figures are set under the IFTA agreement and administered by your base jurisdiction, so confirm the current numbers with them rather than relying on a figure you read once. The reliable move is to file on time, even a zero return.
Which quarter am I filing for right now?
You file for the quarter that just ended, not the one you are in. In early April you file the January-through-March quarter; in early July the April-through-June quarter; and so on. The deadline is always the end of the month after the quarter closes, which gives you about a month to pull your mileage and fuel records together.

Sources and review

Last reviewed by Crossroads Technologies, published on Big Rig Math. Every rule stated on this page was checked against the current text of the regulation or official guidance linked above, as published on the review date.

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