IFTA Fuel Tax Reporting: Who Files, Due Dates and a Worked Example
IFTA splits the fuel tax you paid at the pump among the states you actually drove in. One quarterly return to your base state settles the difference.
The International Fuel Tax Agreement (IFTA) lets an interstate carrier report fuel tax for all member states and Canadian provinces on one quarterly return to its base state. Returns are due April 30, July 31, October 31 and January 31. You owe tax where you drove and get credit for tax paid where you bought fuel, so the return reconciles the two.
Who needs an IFTA license?
A carrier needs an IFTA license if it operates a qualified motor vehicle in two or more member jurisdictions. A qualified motor vehicle is used to carry people or property and meets one of these tests:
- two axles and a gross or registered gross weight over 26,000 pounds;
- three or more axles, regardless of weight; or
- used in a combination whose weight exceeds 26,000 pounds.
Recreational vehicles are excluded. IFTA members are the 48 contiguous U.S. states and the 10 Canadian provinces. Alaska, Hawaii, the Canadian territories and Mexico are outside the agreement.
A leased-on owner-operator may report under the carrier’s license or under their own, depending on the lease. The lease must say who pays fuel taxes under 49 CFR 376.12(e).
How do I get an IFTA license and decals?
- Apply to the IFTA office of your base jurisdiction, usually the state revenue department or DMV, where you have an established place of business and keep your records.
- Have your USDOT number, vehicle list with VINs and business tax details ready.
- Receive one license for the carrier. Keep a copy in each qualified vehicle.
- Receive two decals per qualified vehicle and place them on the outside of the cab, one on each side.
- Renew every year. Licenses and decals run on the calendar year.
A carrier that only occasionally enters a state can buy a temporary fuel permit for that trip instead of joining IFTA. Permits cost money every trip, so they suit carriers with very few interstate runs.
How is the IFTA return calculated?
The return compares the fuel tax you owe each state with the fuel tax you already paid at the pump there. The method:
- Add total miles in all jurisdictions and total gallons used in all qualified vehicles for the quarter.
- Divide miles by gallons to get the fleet’s average miles per gallon.
- For each jurisdiction, divide miles driven there by the average mpg. That is the taxable gallons.
- Multiply taxable gallons by that jurisdiction’s rate for the quarter.
- Subtract the tax-paid gallons you bought there, times the same rate.
- Add the results. A positive total is owed to your base state; a negative total is a credit.
Rates change by quarter and are published in the rate matrix on iftach.org. Some jurisdictions add surcharges, which the matrix shows.
What does a worked IFTA example look like?
This example uses one truck, three made-up states and round tax rates to show the arithmetic. Real returns use the published rates for the quarter. The truck ran 30,000 miles and used 5,000 gallons, for an average of 6.0 mpg.
| State | Miles | Taxable gallons (miles / 6.0) | Example rate | Tax owed | Gallons bought | Tax paid at pump | Net |
|---|---|---|---|---|---|---|---|
| State A | 12,000 | 2,000 | $0.30 | $600.00 | 3,000 | $900.00 | -$300.00 |
| State B | 10,000 | 1,667 | $0.40 | $666.80 | 2,000 | $800.00 | -$133.20 |
| State C | 8,000 | 1,333 | $0.50 | $666.50 | 0 | $0.00 | $666.50 |
| Total | 30,000 | 5,000 | $1,933.30 | 5,000 | $1,700.00 | $233.30 due |
The carrier bought fuel in the two cheaper-tax states and drove through the most expensive one without fueling, so it owes $233.30. The base state collects that amount and passes each jurisdiction its share.
What records do I need to keep for IFTA?
IFTA requires distance and fuel records for four years from the return’s due date or filing date, whichever is later. Auditors look for:
- trip records showing date, origin, destination, route, odometer or hubometer readings and miles in each jurisdiction, by vehicle;
- fuel receipts showing date, seller, gallons, fuel type, price and the vehicle or unit number;
- bulk fuel records if you fuel from your own tank.
ELD and GPS data can supply the mileage if it shows miles by jurisdiction. Missing records let the auditor estimate, often at a low mpg that raises the tax due. The same mileage records feed your IRP apportioned registration, so keep one set that serves both.
What happens if I file IFTA late?
A late return or late payment draws a penalty of $50 or 10 percent of net tax due, whichever is greater, plus interest that runs until paid. A return is still due when you ran no miles or owe nothing; skipping it can bring a penalty and put the license at risk of suspension or revocation. Check your base jurisdiction’s notice for the exact amount and any weekend extension of the deadline.
Bottom line
Where you buy fuel changes your IFTA bill even though it does not change the total tax across the fleet. Fueling heavily in low-tax states leaves credits that offset miles in high-tax ones, but the return only balances out if every receipt is kept. IFTA is separate from the federal heavy vehicle use tax on Form 2290, which is paid once a year to the IRS.
FAQ
When are IFTA returns due?
The last day of the month after each quarter: April 30, July 31, October 31 and January 31. If the date falls on a weekend or holiday, many jurisdictions accept the return on the next business day.
Do I need IFTA if I only drive in one state?
No. IFTA is for qualified vehicles running in two or more member jurisdictions. Intrastate carriers pay fuel tax at the pump under state rules.
Do I file if I had no miles this quarter?
Yes. A licensed carrier must file every quarter, including a zero return, until the license is cancelled.
How long do I keep IFTA records?
Four years from the due date or the filing date of the return, whichever is later.
