IFTA Quarterly Filing Deadlines: When Your Fuel-Tax Return Is Due
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 dates do not move from year to year, so once you know the pattern you can plan around it. 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. When a due date falls on a weekend or a holiday in your base jurisdiction, it rolls to the next business day.
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 each state 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 a due date lands on a weekend or a legal holiday in your base jurisdiction, it rolls to the next business day.
- 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.
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Thinking about factoring your loads?
A quarterly filing lands on a fixed date whether or not your brokers have paid yet. Factoring advances the invoice so the tax bill is not waiting on someone else's payment terms.