IFTA Explained: Who Needs It, Quarterly Returns & Decals

Before IFTA, a truck running through several states had to keep a separate fuel tax permit and file a separate return for each state it touched. The International Fuel Tax Agreement replaced that paperwork pile with a single system shared by the 48 contiguous U.S. states and 10 Canadian provinces.

Under IFTA you register once in your base jurisdiction, get one license and a set of decals, and file one quarterly return. That return reconciles the fuel you bought (and paid tax on at the pump) against the miles you actually drove in each jurisdiction. The math redistributes the money so each state or province gets the fuel tax owed for the miles run there. You either owe a little or get a credit, depending on where you fueled versus where you drove.

Your base jurisdiction is normally the state or province where your vehicles are registered, where you keep your operational records, and where some travel actually happens. You apply for IFTA there — you cannot pick a base jurisdiction just because its process is easier.

When approved, the base jurisdiction issues one IFTA license. Keep a copy in the cab of each qualified vehicle. It also issues two decals per qualified vehicle for the license year. Whether you can carry a photocopy of the license or need the original varies, so check your state's rule. Most jurisdictions now handle applications and renewals through an online portal.

Each qualified vehicle gets a set of two IFTA decals for the calendar year — one for each side (the driver and passenger sides of the cab). They must be displayed on the exterior of the cab so an inspector can read them.

Decals expire at the end of the license year, though many jurisdictions allow a grace period (often through the end of the prior year's December into the first months of the new year) during which last year's decals remain valid while you renew. Renew on time: running without current, valid decals — or running interstate with no IFTA credentials at all — can mean fines or being held at a port of entry. If you only occasionally leave your home state, temporary trip permits per state can be an alternative to full IFTA registration, but for regular interstate operation IFTA is almost always cheaper and simpler.

Every quarter you report, for each jurisdiction you traveled in, your total miles driven and the total taxable gallons of fuel purchased. The return calculates your fleet's overall miles-per-gallon, applies it to the miles in each jurisdiction to figure the fuel "consumed" there, then compares that to the tax you already paid at the pump in each place. Each jurisdiction has its own tax rate, and rates change every quarter.

From there it nets out to a single number — a balance you owe or a credit. You file the return and remit any payment to your base jurisdiction, which handles distributing the money to the other states and provinces. You must file even for a quarter with zero miles. QuickTruckTax can help you organize trip and fuel data, compute your jurisdiction-by-jurisdiction miles and gallons, and validate the return before you submit it to your base jurisdiction — we help you prepare it, we do not file it for you.

IFTA accounts get audited, and clean records are what protect you. You generally must keep your IFTA records for four years from the return due date or filing date, whichever is later.

For miles, keep an Individual Vehicle Mileage Record (IVMR) or equivalent for every trip: dates, route, origin and destination, total miles, and miles by jurisdiction. Electronic logging device (ELD) and GPS data is widely accepted and makes this far easier. For fuel, keep every receipt or invoice showing date, seller, location, number of gallons, fuel type, vehicle, and the purchaser — bulk fuel from your own tank has extra documentation rules. Missing or sloppy records during an audit can cause the auditor to disallow your reported MPG and recalculate tax against you, which is how a small operator ends up with a large surprise bill.

IFTA is one piece of running interstate. It is separate from — but often confused with — IRP (the apportioned license plate program), which is about registering your vehicle's weight across jurisdictions, not fuel tax. Many carriers handle IFTA and IRP through the same state portal at the same time.

IFTA also sits alongside your Form 2290 heavy vehicle use tax, your USDOT number and MCS-150 biennial update, your UCR registration, and your BOC-3 process agent filing. They have different agencies and different deadlines, so it helps to track them together. This page is general guidance, not legal or tax advice — always confirm current rules, rates, and deadlines with your base jurisdiction and the official IFTA program before you file.