For interstate commercial motor carriers, the International Fuel Tax Agreement (IFTA) is a fundamental part of doing business. Yet, the task of tracking fuel receipts, recording odometer readings, and submitting quarterly filings remains one of the most tedious administrative burdens for fleet owners.
In this guide, we break down exactly how IFTA works, who needs to register, and how you can simplify your reporting to avoid costly audit discrepancies.
What is IFTA?
Before IFTA was established, commercial trucks had to purchase separate fuel permits for every single state they crossed. This created immense administrative friction and slowed interstate commerce.
IFTA simplified this by creating a cooperative agreement between the 48 contiguous U.S. states and 10 Canadian provinces. Under IFTA, a carrier registers with their “home state” (base jurisdiction) and receives a set of IFTA credentials. You track your miles and fuel purchases in all jurisdictions, file a single consolidated quarterly return, and either pay or receive a credit for the net fuel tax difference.
Do You Need an IFTA License?
You are required to register for an IFTA license if your commercial vehicle operates in two or more member jurisdictions and fits any of the following criteria:
- It has two axles and a registered gross vehicle weight (GVW) or gross vehicle weight rating (GVWR) exceeding 26,000 pounds.
- It has three or more axles, regardless of its weight.
- It is used in combination, and the combined weight exceeds 26,000 pounds.
If you only operate within your home state, you do not need IFTA credentials.
Tracking the Essential Metrics
To file a correct IFTA return, you must track two absolute data points for every single quarterly period:
1. Total Mileage in Each State
You must record the exact miles driven in each state or province. This includes toll road miles, off-highway miles, and deadhead miles. Most modern carriers rely on Electronic Logging Devices (ELDs) with GPS features to generate these reports, though these systems must be audited for accuracy.
2. Fuel Purchases in Each State
You must keep complete receipts or invoices for all tax-paid fuel placed into your vehicle’s fuel tanks. A valid fuel receipt must show:
- Date of purchase.
- Seller’s name and address.
- Number of gallons purchased.
- Fuel type (diesel, gasoline, etc.).
- Vehicle identification number (VIN) or unit number.
Key IFTA Deadlines
IFTA returns are due quarterly. The deadlines are strictly enforced, and late filings are subject to a $50.00 penalty or 10% of the tax due (whichever is greater), plus monthly interest.
The filing quarters are:
- Q1 (Jan - Mar): Due April 30
- Q2 (Apr - Jun): Due July 31
- Q3 (Jul - Sep): Due October 31
- Q4 (Oct - Dec): Due January 31
How to Avoid IFTA Audits
State agencies routinely audit carriers to ensure their mileage reports match fuel purchase logs. Here are three tips to stay safe:
- Never estimate mileage: Rounding off numbers is an immediate red flag for auditors. Always report precise digits.
- Maintain original copies: Keep all fuel receipts and trip sheets for at least 4 years from the filing date.
- Verify ELD data: GPS drifts and software glitches can create gaps. Ensure you run monthly checks on your automated logs.
At AJM, we handle all your quarterly IFTA collections and filings. We analyze your ELD logs, match them to your fuel accounts, and submit clean filings so you can keep driving with peace of mind.