IFTA stands for the International Fuel Tax Agreement. It covers the 48 lower US states and 10 Canadian provinces and exists to simplify fuel tax reporting for motor carriers that cross state lines. Instead of registering and filing fuel tax returns separately in every state you operate in, you file a single quarterly return through your base jurisdiction. That jurisdiction then redistributes what you owe to each state based on the miles you actually drove there.

If you run commercial vehicles over 26,000 pounds or with three or more axles across state lines, you almost certainly need an IFTA license and decals for each qualifying vehicle.

Tracking for IFTA has two sides: fuel purchases and mileage. Every fuel purchase needs to be recorded with the date, the state or province where you bought it, the number of gallons, the price per gallon or total cost, and which vehicle or unit made the purchase. Fuel receipts are your primary documentation. Keep them organized by quarter and by vehicle because you will need them if you are ever audited. The IFTA audit look-back period is typically three to four years, so your records need to hold up over time.

On the mileage side, you need total miles driven in each state for every IFTA-qualified vehicle. ELD data and GPS tracking help capture this, but the data still needs to be pulled together and reconciled against your fuel records. The quarterly return calculates your fleet’s average miles per gallon, then applies that rate to the miles driven in each state. States where you purchased more fuel than your mileage warrants give you a credit. States where you drove more miles than your fuel purchases cover result in additional tax due.

Quarterly deadlines are April 30, July 31, October 31, and January 31 for the preceding quarters. Late filings bring penalties that vary by state but typically include a percentage of the tax owed plus interest. Repeated non-compliance can lead to IFTA license revocation, which means you cannot legally operate across state lines.

The bookkeeping challenge for transportation companies is that IFTA data has to be captured in real time. Reconstructing fuel purchases and mileage after the fact is painful and error-prone. Build the habit of saving every fuel receipt and reconciling mileage records weekly or at minimum monthly. The quarterly filing itself is straightforward if the underlying data is clean. If it is not, you are either scrambling at deadline or filing inaccurate numbers that invite penalties.

Working with bookkeepers in Fairfax who understand IFTA requirements means your fuel purchases get recorded with the right detail from the start, mileage data stays organized, and quarterly filings go out on time. The cost of getting this wrong through missed deadlines or sloppy records adds up fast, especially across a fleet of vehicles operating in multiple states.