IFTA explained: how to file, when it’s due, and how it’s calculated
IFTA reconciles the fuel tax you owe each state against the fuel you bought there. Returns are due April 30, July 31, October 31, and January 31. Here is the method.
IFTA – the International Fuel Tax Agreement – is the reason you keep every fuel receipt and every trip mile. It lets you file fuel taxes for all the states and provinces you run on one quarterly return through your base state, instead of filing in each one. The returns are due April 30, July 31, October 31, and January 31. Here is how it actually works. File through your base jurisdiction; see IFTA, Inc. for member rates and forms.
Who needs IFTA
IFTA applies to qualified motor vehicles operating in two or more member jurisdictions – generally trucks over 26,000 lbs or with three or more axles. You get one IFTA license and a set of decals from your base state and run under them across the 48 contiguous U.S. states and 10 Canadian provinces.
How IFTA is calculated
The core idea: you pay fuel tax to each state based on the miles you drove there, and you get credit for the fuel tax you already paid at the pump there. Each quarter you report, by jurisdiction, your miles driven and gallons purchased. The system applies each jurisdiction’s tax rate to your fuel use in that jurisdiction, subtracts what you already paid at the pump, and you either owe the difference or get a credit.
Simple example of the method: if you ran a lot of miles through a high-tax state but bought all your fuel in a cheaper neighboring state, you will owe that high-tax state at filing time – the cheap pump price did not actually save you the tax, it just deferred it to IFTA.
The deadlines
| Quarter | Period | Due |
|---|---|---|
| Q1 | Jan-Mar | April 30 |
| Q2 | Apr-Jun | July 31 |
| Q3 | Jul-Sep | October 31 |
| Q4 | Oct-Dec | January 31 |
Records are everything
IFTA audits come down to records. You need accurate distance by jurisdiction (most ELDs track this with GPS) and fuel receipts showing date, location, and gallons. Missing records mean the auditor estimates – and the estimate will not be in your favor. Note that deadhead miles still count: empty miles through a state are taxable distance even though you earned nothing on them.
How IFTA fits your other filings
IFTA is separate from your federal income taxes and the 2290, and separate again from your operating authority obligations. New operators should calendar all four IFTA dates the day they get their decals so a missed quarter never sneaks up.
The bottom line
IFTA is not hard if your records are clean: log miles by state, keep fuel receipts, and file by the four quarterly deadlines. The operators who get hurt are the ones who guess at mileage – let your ELD do the distance and reconcile every quarter.
Frequently asked questions
What is IFTA?
The International Fuel Tax Agreement lets you file fuel taxes for all member states and provinces on one quarterly return through your base state, instead of filing separately in every jurisdiction you run.
When is IFTA due?
Quarterly: April 30, July 31, October 31, and January 31. If a due date falls on a weekend or holiday, it generally moves to the next business day.
How is IFTA calculated?
You report miles driven in each jurisdiction and fuel purchased in each jurisdiction. The system computes the tax you owe per jurisdiction at its rate, credits the fuel tax you already paid at the pump, and you settle the difference.
Who needs IFTA?
Generally, qualified motor vehicles operating in two or more member jurisdictions - typically trucks over 26,000 lbs or with three or more axles. Your base state issues the license and decals.
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