What is a base jurisdiction for IFTA purposes?

Your base jurisdiction is the state or province where your qualified motor vehicles are registered, where your operational records are kept, and where the vehicles are based when not on the road. You register for IFTA in your base jurisdiction and receive decals and a license from that state. You file all quarterly returns with the base jurisdiction, which then handles distributing taxes collected to other member jurisdictions. If you move your operations to a different state, you need to transfer your IFTA credentials to the new base jurisdiction.

Which vehicles are required to have IFTA credentials?

IFTA applies to qualified motor vehicles — defined as vehicles used in interstate commerce with two axles and a gross vehicle weight over 26,000 pounds, OR vehicles with three or more axles regardless of weight, OR vehicle combinations (truck plus trailer) with a gross combined weight over 26,000 pounds. Vehicles operating exclusively within one jurisdiction are not required to have IFTA credentials. Recreational vehicles are also exempt. If your truck meets the size and weight thresholds and crosses state lines, IFTA credentials are required.

What records does IFTA require me to keep, and for how long?

IFTA requires you to retain records that support your quarterly returns for four years from the date the return was filed. Required records include individual vehicle mileage records (trip reports showing beginning and ending odometer, date, origin, destination, route, and miles per jurisdiction), fuel receipts for every purchase (showing date, seller, location, gallons, price per gallon, and vehicle identification), and fuel card statements or summaries. Electronic records and ELD exports are acceptable if they contain all required data fields and can be produced on request during an audit.

What happens if I miss an IFTA filing deadline?

Late filings result in a penalty — typically $50 or 10 percent of the net tax due, whichever is greater, depending on the base jurisdiction. Interest also accrues on unpaid balances. If you miss multiple quarters, your IFTA license can be suspended, which means you would need to purchase trip permits for each state individually while the suspension is in effect — a significant operational burden. Some states also report non-compliant carriers to FMCSA. File even if you cannot pay in full; the late-filing penalty is separate from any payment arrangement you make afterward.

How to Prepare Your IFTA Quarterly Report

IFTA quarterly returns trip up a lot of new carriers — not because the math is hard, but because the records were not kept well during the quarter. If you have clean fuel receipts and accurate jurisdiction mileage records, the filing itself is straightforward. If you are missing receipts or mileage data, you are reconstructing the quarter from incomplete records, which creates audit risk. The preparation happens during the quarter, not in the days before the deadline.

Step 1: Gather all fuel receipts and mileage records for the quarter

IFTA runs on two data points for every jurisdiction: gallons purchased there and miles driven there. Fuel cards make the fuel side easy — your card company provides a transaction report with every purchase listed by state, gallons, and price. The mileage side requires trip records. Your ELD system should produce a jurisdiction mileage report; if yours does not, you need GPS records or paper trip logs showing state crossings with odometer readings at each crossing point.

One thing new carriers miss: deadhead miles count. Every mile your truck moves in any direction, loaded or empty, must be reported to the jurisdiction where those miles occurred. A 200-mile empty repositioning run from Memphis to Nashville counts as 200 Tennessee miles whether or not you carried freight.

Step 2: Calculate total miles traveled in each jurisdiction

IFTA covers 48 U.S. states and 10 Canadian provinces. For each jurisdiction you entered during the quarter — including brief pass-through states — you need total miles driven. Most ELD systems can export this as a state mileage breakdown. If you are working from paper logs, go trip by trip and note where you crossed state lines and your odometer at each crossing.

The jurisdiction mileage total does not need to be exact to the mile if your records are good, but it needs to be accurate enough to survive an audit. Auditors compare your mileage records to fuel purchase locations, GPS data if available, and the physical plausibility of your routes. Significant unexplained discrepancies between your reported miles and what the route would actually require are an audit finding.

Step 3: Calculate total gallons purchased in each jurisdiction

Fuel credit goes to the jurisdiction where the fuel was physically purchased — not where it was burned. If you fill up in Missouri and then drive 300 miles through Illinois, Missouri gets the purchase credit and Illinois gets the miles-driven allocation.

For each fuel receipt, record the state, date, gallons, and vehicle. Fuel card summaries list all of this by transaction. For any cash purchase, keep the original receipt — IFTA auditors do not accept reconstructed fuel records without source documents. Total the gallons by jurisdiction at the end of the quarter.

Step 4: Calculate fleet MPG and net tax due per jurisdiction

IFTA determines what you owe through a straightforward allocation: total fleet miles divided by total gallons = fleet average MPG. Then, for each jurisdiction, miles driven divided by fleet MPG = gallons you should have consumed there. Compare that to gallons actually purchased there:

Consumed more than purchased: you owe tax to that jurisdiction
Purchased more than consumed: you have a credit from that jurisdiction

Your base jurisdiction's IFTA return form walks through this calculation column by column for each member jurisdiction. The net across all jurisdictions is what you pay or receive as a refund for the quarter. Most base states also offer an online filing portal that performs the calculation automatically once you enter your miles and gallons per jurisdiction.

Step 5: File the return and pay any balance due before the deadline

The four IFTA quarterly deadlines are April 30 (Q1), July 31 (Q2), October 31 (Q3), and January 31 (Q4). File with your base jurisdiction's IFTA program — most states have an online portal where you enter jurisdiction miles and fuel data and it calculates net tax due. If you owe a balance, pay it with the return. If you have a net credit, you will receive a refund or credit toward next quarter.

File a zero return if you had no miles during the quarter. Most jurisdictions require a zero return to keep your IFTA credentials active — skipping a quarter, even a zero-activity quarter, can trigger a license suspension and require you to buy individual trip permits while suspended.

Common questions

What is a base jurisdiction?

Your base jurisdiction is the state where your vehicles are registered, your records are kept, and your operations are based. You obtain your IFTA license and decals from the base jurisdiction and file all quarterly returns there. The base jurisdiction collects your net payment (or issues your refund) and distributes tax revenue to other member jurisdictions on your behalf. Carriers cannot split operations across multiple base jurisdictions — all vehicles in the fleet must use the same base state.

Which vehicles need IFTA credentials?

IFTA applies to qualified motor vehicles used in interstate commerce: vehicles with two axles over 26,000 pounds gross weight, any vehicle with three or more axles, or combinations over 26,000 pounds combined weight. Single-jurisdiction operations and recreational vehicles are exempt. If your truck crosses a state line and meets the weight threshold, IFTA credentials are required for every state you enter — an IFTA decal and license covers all member jurisdictions with a single credential set.

How long do I need to keep IFTA records?

Four years from the date the return was filed. Required records include trip reports (with odometer readings, route, and miles by jurisdiction), all fuel purchase receipts, and fuel card statements. Electronic records are acceptable if they are complete and retrievable. During an IFTA audit, auditors will reconcile your records against your filed returns — gaps in fuel documentation or mileage records are treated as unverified data, which often means the auditor estimates based on average fuel consumption, and estimates rarely favor the carrier.

What happens if I miss the filing deadline?

Late filings incur a penalty — typically $50 or 10 percent of net tax due, whichever is greater — plus interest on any unpaid balance. Repeated late filings or non-filing can result in IFTA license suspension, forcing you to buy trip permits for every state individually until the license is reinstated. File even if you cannot pay the full amount — late-filing and late-payment penalties are separate, and filing on time eliminates the failure-to-file portion of the penalty.