You just got your CDL, bought your first truck, and you are hauling loads across state lines. Then someone mentions IFTA and you realize there is a whole layer of tax compliance you knew nothing about. Do not worry — this guide covers everything you need from scratch, in plain English.
What Is IFTA?
IFTA stands for the International Fuel Tax Agreement. It is a cooperative agreement between 48 US states and 10 Canadian provinces that simplifies fuel tax reporting for commercial truckers who cross state lines.
Before IFTA, truckers had to buy a separate fuel permit for every state they entered, file a separate return with every state, and make separate payments to each. A driver on a five-state route managed five sets of paperwork every quarter. IFTA replaced all of that with one license, one quarterly return, and one payment or refund — all handled through your home base state.
Do You Need an IFTA License?
You must register for IFTA if your commercial vehicle operates in two or more IFTA member states AND meets at least one of these criteria:
- Gross vehicle weight over 26,000 lbs
- Three or more axles regardless of weight
- Used in combination with a trailer pushing combined weight over 26,000 lbs
You do NOT need IFTA if you only operate in one state, if your vehicle is recreational, or if you are a government operator in most jurisdictions. If you haul freight across state lines in a standard commercial truck, you need IFTA.
How to Get Your IFTA License
You apply through your base state's motor carrier or transportation department — not through any federal agency. Your base state is typically where your truck is registered or your business is based. The process generally involves:
- Completing an IFTA application (most states have online portals)
- Providing your vehicle information (VIN, plate, registered weight)
- Paying a small application fee (usually under $20)
- Receiving your IFTA license and two annual decals
The decals go on the exterior of your cab, one on each side. Carry your license in the cab at all times. Driving without valid IFTA credentials can result in roadside fines and forced permit purchases at state weigh stations.
What You Must Track Every Quarter
IFTA requires two data points per state per quarter: miles driven in each state, and gallons of fuel purchased in each state. Your entire quarterly tax calculation is based on these two numbers.
Tracking Miles by State
You need records showing exactly how many miles you drove in each state. Acceptable methods include: GPS devices that automatically log state-by-state mileage, Electronic Logging Devices (ELDs), trip sheets where you record your odometer at every state line crossing, and fleet management software exports. Manual rounded estimates work technically but are a major audit trigger.
Tracking Fuel Purchases by State
Save every single fuel receipt. Each one must show the date, the location (state), the number of gallons, and the price. Fleet fuel cards work great — download and store monthly statements. The state where you physically pumped the fuel is the state it goes on your return, regardless of where you burned it.
How Your IFTA Tax Is Calculated
IFTA uses an official four-step formula. Here is how it works in plain English:
- Fleet MPG: Total miles (all states) ÷ total gallons purchased (all states) = your average fuel efficiency for the quarter
- Gallons consumed per state: State miles ÷ fleet MPG = how many gallons IFTA says you burned in that state
- Net taxable gallons: Gallons consumed − gallons purchased in that state. Positive = you owe tax. Negative = you earned a credit.
- Tax due: Net taxable gallons × that state's IFTA rate
All state results are summed. You either pay a net balance to your base state or receive a refund. Use our free IFTA calculator to run all of this automatically — just enter miles and gallons per state.
The 2026 Quarterly Deadlines
IFTA returns are due four times per year. Missing a deadline means a minimum $50 penalty or 10% of tax due, whichever is greater — even on zero-activity quarters.
- Q1 (January–March) — Due April 30, 2026
- Q2 (April–June) — Due July 31, 2026
- Q3 (July–September) — Due October 31, 2026
- Q4 (October–December) — Due January 31, 2027
Step-by-Step: Filing Your First Return
- Gather all fuel receipts for the quarter
- Pull GPS or trip sheet mileage and total miles per state
- Total gallons purchased per state from receipts
- Enter data into our free calculator to get your tax breakdown
- Log into your base state's IFTA online portal
- Transfer the figures and submit before the deadline
- Pay any net balance or request your credit refund
- Keep all records for at least 4 years
Special States Every New Driver Should Know
- Pennsylvania ($0.741/gal) — highest IFTA diesel rate in the US. Fuel up before you cross the border.
- Kentucky, Virginia, New York, New Mexico — these four states have mandatory surcharges on top of the base rate that can never be offset by credits. You always owe them.
- Oregon — $0.00 IFTA diesel rate, but requires a separate weight-mile tax filed with ODOT.
Record Keeping Requirements
IFTA requires you to keep all supporting records for a minimum of 4 years from the filing date. This includes every fuel receipt, all mileage logs or GPS exports, and copies of every quarterly return filed. Any IFTA member state can audit your records within that window.