IFTA Quarterly Filing, Explained for First-Year Carriers

If you run interstate under IFTA, you file a fuel tax return four times a year, every year, including the quarters where you barely turned a wheel. First-year carriers get in trouble on the rhythm, not the math. Here is how the cycle works and what to keep from day one.

What IFTA is

The International Fuel Tax Agreement is a deal among the 48 contiguous states and 10 Canadian provinces. Instead of filing a fuel tax return in every state you drive through, you hold one IFTA license from your base state, report all your miles and fuel purchases on one quarterly return, and your base state settles the difference with the other jurisdictions.

IFTA generally applies to qualified motor vehicles used in two or more member jurisdictions: vehicles with two axles and a gross weight or registered weight over 26,000 pounds, vehicles with three or more axles regardless of weight, and combinations over 26,000 pounds.

Your base state issues your IFTA license and two decals per vehicle each year. The license copy rides in the cab, the decals go on the truck.

The four due dates

Returns are due the last day of the month after each quarter ends:

If a due date lands on a weekend or a legal holiday, the deadline moves to the next business day.

File every quarter even if the truck never moved. A no-operations return takes minutes. A missing return starts penalties and, in many states, blocks your renewal.

What to keep from day one

The return is built from two record streams, and reconstructing them months later is where first-year carriers suffer:

• Distance records for every trip: dates, origin and destination, route, odometer readings, and miles driven in each jurisdiction. Most carriers pull this from their ELD or GPS.
• Fuel records: every fuel receipt or invoice, showing the date, where you bought it, the vehicle, and the gallons. You need the total for each jurisdiction too.

Keep IFTA records for four years. Your base state can audit your returns, and an audit with missing records turns into estimated tax bills that are hard to fight.

How a quarter actually works

• Drive your miles and keep your records as you go
• At quarter end, total your miles by state and your fuel purchases by state
• Your return converts miles into gallons used per state (miles divided by your fleet's miles per gallon) and compares that against the tax you already paid at the pump in each state
• You pay the difference, or get a credit, through your base state

The practical point: fuel bought in a state is not the same as fuel burned in a state. Your return exists to square that difference.

First-year mistakes

• Missing a quarter entirely. The late penalty is $50 or 10 percent of your net tax liability, whichever is greater, plus interest, and it applies even when you owe little tax.
• Filing from memory. Guessed mileage splits fall apart in an audit. Use the ELD data.
• Throwing away fuel receipts. A purchase you cannot document is a credit you cannot claim.
• Letting the annual license lapse. Renew before year end and get the new decals on the truck; enforcement checks them.
• Confusing IFTA with IRP. IRP is your apportioned plates. IFTA is the fuel tax. Two programs, two renewals, similar data.

IFTA also sits underneath the rest of your compliance stack. Your fleet size and operation show up on your MCS-150 biennial update, and FMCSA looks at the whole record during your new entrant safety audit.