IFTA Requirements for Motor Carriers: Complete Fuel Tax Guide

By CarrierLens Compliance Team • Last updated: 2026-05-01

The International Fuel Tax Agreement (IFTA) simplifies fuel tax reporting for motor carriers operating in multiple states and Canadian provinces. Instead of filing separate fuel tax returns in every jurisdiction where you travel, IFTA carriers file a single quarterly return with their base jurisdiction, which then distributes taxes to the appropriate states. This guide covers who must register, how reporting works, what records you must keep, and what triggers an IFTA audit.

What Is IFTA?

IFTA is an agreement among 48 US states and 10 Canadian provinces that standardizes fuel tax reporting and collection for interstate motor carriers. Under IFTA, carriers track all fuel purchased and all miles traveled by jurisdiction, then file a single quarterly report with the state where the carrier is based (the "base jurisdiction"). The base state collects net fuel tax due and distributes funds to states where more miles were driven than fuel was purchased.

The 48 contiguous US states and DC participate in IFTA. Alaska, Hawaii, and most Canadian territories do not.

Who Must Register for IFTA?

IFTA registration is required for motor carriers who operate qualified motor vehicles in two or more IFTA member jurisdictions. A qualified motor vehicle is:

• A vehicle with two axles and a gross vehicle weight rating over 26,000 lbs, OR
• A vehicle with three or more axles (regardless of weight), OR
• A combination vehicle (truck and trailer) with a combined GVW or GVWR over 26,000 lbs

Owner-operators who travel only within one state do not need IFTA registration. Vehicles that never cross state lines are exempt.

How to Register for IFTA

Register with your base jurisdiction's IFTA office (typically the state DOT or Department of Revenue). You'll receive:

• An IFTA license — one per carrier, which must be carried in each qualified vehicle
• Two IFTA decals per vehicle — must be displayed on both sides of the cab

IFTA licenses and decals must be renewed annually. Decals expire December 31 of each year; many jurisdictions allow operations through February 28 of the following year with the prior year's decals while new ones are being obtained.

Quarterly Reporting Requirements

IFTA carriers must file a quarterly fuel tax return with their base jurisdiction covering:

• Total miles traveled in each IFTA jurisdiction
• Total fuel consumed in each jurisdiction (calculated from total miles and average MPG)
• Total fuel purchased (by jurisdiction, using receipts)
• Net tax due or refund owed by jurisdiction

Quarterly filing deadlines:

• Q1 (January–March): due April 30
• Q2 (April–June): due July 31
• Q3 (July–September): due October 31
• Q4 (October–December): due January 31

Late returns incur a penalty of $50 or 10% of the net tax due (whichever is greater) in most jurisdictions.

IFTA Record-Keeping Requirements

IFTA auditors look for complete, accurate records for at least 4 years from the filing due date. Required records include:

• Mileage records: Trip reports or driver logs showing date, origin, destination, beginning and ending odometer or hubodometer readings, and route
• Fuel receipts: Date, seller, location, type of fuel, number of gallons, and price per gallon for all fuel purchased — bulk fuel records for carriers who fuel from their own tanks
• Fleet mileage summaries: Consolidated records by vehicle and by jurisdiction for each quarter

Common IFTA Audit Triggers

• Unusually high or low MPG compared to the vehicle type
• Fuel purchased primarily in low-tax states relative to miles driven in high-tax states
• Incomplete or inconsistent mileage records
• Filing a return with estimated rather than actual mileage
• Random selection audits — every IFTA jurisdiction conducts regular random audits