What IFTA is actually doing
The International Fuel Tax Agreement solves a simple fairness problem: you buy fuel (and pay fuel tax) in some states, but burn it on other states' roads. Instead of filing in every state you touch, you file one quarterly return with your base jurisdiction, the state where you're registered, reporting miles run and fuel bought in each member state. The math redistributes the tax: states where you drove more than you fueled get paid; states where you fueled more than you drove credit you back. You settle the net difference with one payment (or refund).
Who needs it: vehicles over 26,000 lbs (or 3+ axles) crossing state lines commercially. Your IFTA license and decals come from your base state; the return is due quarterly whether you owe or not, including zero-activity quarters. Missing a filing suspends the license, and a suspended IFTA license parks the truck.
The records that make or break it
Miles, by state, per trip
The gold standard is your ELD's mileage-by-jurisdiction report, modern ELDs produce exactly the breakdown IFTA wants. Whatever the source, auditors expect trip-level support: date, origin, destination, route, odometer readings, and miles per state. Total miles must include deadhead and personal conveyance, all miles, not billable miles. The classic audit failure isn't cheating; it's gaps, a truck that 'teleported' from Georgia to Ohio with no miles in Tennessee gets the whole return questioned.
Fuel, by state, with receipts
Every gallon needs a receipt or fuel-card line showing date, seller, state, gallons, and amount. Fuel card statements (Comdata, EFS, RTS and the rest) are the clean source, one download covers the quarter. Cash pump receipts fade; photograph them same-day into a folder. Bulk fuel from your own tank has its own withdrawal-log rules if you run that setup.
Filing the quarter, step by step
- Pull total miles and per-state miles from the ELD for the quarter
- Pull total gallons and per-state gallons from fuel statements
- Compute fleet MPG: total miles ÷ total gallons (IFTA uses this single fleet-wide figure)
- For each state: taxable gallons = state miles ÷ fleet MPG; tax owed = taxable gallons × that state's current rate; credit = tax already paid at that state's pumps
- Sum the net across states, file in your base state's portal, pay or bank the refund
Deadlines: end of the month following each quarter. April 30, July 31, October 31, January 31. Rates change quarterly (they're published each quarter, surcharge states like Indiana, Kentucky, and Virginia have an extra line), which is one more reason to file from the portal's current tables rather than a stale spreadsheet.
What triggers audits, and what happens in one
- Material MPG changes or results inconsistent with the vehicle and operation, which can indicate missing fuel, missing distance, or a data-source problem
- Round numbers and estimates: mileage that's suspiciously even, quarter after quarter, reads as reconstructed
- Gap states and impossible routes: the teleporting-truck problem above
- Late or missing returns, chronic lateness invites a look at everything
An IFTA audit is a records exam: they sample quarters, trace trips against your logs, and recompute. Clean ELD data plus fuel statements ends it quickly. Missing or inadequate records can lead a jurisdiction to use adverse estimates or other audit adjustments under the current agreement, manual, and base-jurisdiction rules, plus applicable penalties and interest. The whole game is contemporaneous records; nothing reconstructs well after the fact.
Making it a non-event
The owner-operators who never think about IFTA all share one system: ELD configured correctly, all fuel on cards, statements landing with a bookkeeper monthly, so each quarter's data is already reconciled when the deadline arrives. That's how we run it for trucking clients: IFTA-ready fuel and mileage records as a byproduct of monthly bookkeeping, not a quarterly scramble. The same records feed your cost-per-mile ( Cost Per Mile for Owner-Operators: Calculate Yours in 15 Minutes ), the tax chore and the profit metric come from identical data, so doing one well means the other is free. Trucking
Frequently asked questions
Do I file IFTA if I only ran intrastate this quarter?
If you hold the license, you file, a zero or single-state return is still a return. Skipping 'because nothing happened' is how licenses get suspended.
Is IFTA the same as the 2290?
No. Form 2290 is the federal heavy vehicle use tax, an annual filing on the truck itself. Separate obligation, separate guide: Form 2290: Who Files, When, and How Much .
Can my dispatcher or factoring company handle IFTA?
Some sell it as an add-on, working from your data, which is the point: whoever files, the records are yours to keep and yours to defend. A bookkeeper who maintains them monthly protects you in the audit, not just the filing.
Primary sources