IFTA Compliance and Reporting for Illinois Carriers

The International Fuel Tax Agreement (IFTA) is a tax collection agreement for motor carriers operating in multiple jurisdictions across the United States and Canada. In Illinois, the program is administered by the Illinois Department of Revenue (IDOR). Carriers based in Illinois must obtain an IFTA license if they operate qualified motor vehicles—defined as having three or more axles or a gross vehicle weight exceeding 26,000 pounds—in at least one other IFTA member jurisdiction. This system simplifies fuel tax reporting by allowing a carrier to file one quarterly tax return with their base jurisdiction rather than filing individual returns for every state where miles were traveled. Filing accuracy is critical to avoid audits and interest penalties. DispatchTool simplifies this process by automatically calculating state-by-state mileage using GPS-verified truck-safe routing, ensuring that every mile traveled on Illinois interstates like I-80 or I-55 is correctly categorized. By syncing fuel purchase data with distance logs, the platform prepares the necessary figures for the IL-1040-MT or electronic equivalent. You can manage your quarterly tax obligations more efficiently by creating a DispatchTool account to centralize your trip and fuel data.

Registration and Licensing Requirements

To register for IFTA in Illinois, a carrier must have an established place of business in the state, maintain operational control of their fleet from an Illinois location, and accrue mileage on Illinois roads. The application is filed via the MyTax Illinois portal. While Illinois does not charge a fee for the initial IFTA license or the two required decals, carriers must renew their credentials annually. The license is valid from January 1 through December 31. A 60-day grace period exists through February of the following year, provided the carrier has submitted their renewal application by December 31. Failure to display valid decals can result in a fine of at least $75 per occurrence according to IDOR regulations.

Quarterly Filing Deadlines and Penalties

Illinois requires IFTA returns to be filed quarterly. The specific deadlines are April 30 (Q1), July 31 (Q2), October 31 (Q3), and January 31 (Q4). If the due date falls on a weekend or state holiday, the return is due the next business day. Late filings are subject to a penalty of $50 or 10% of the total tax due, whichever is greater. Furthermore, interest is assessed on all late payments at a rate of 1% per month, calculated from the date the tax was due until the date paid. Carriers must file a 'zero report' even if no interstate miles were traveled during a specific quarter to maintain an active account status.

Illinois Fuel Tax Rates and Surcharges

Illinois maintains two distinct components for its fuel tax: the Motor Fuel Tax and the additional Part B Surcharge. As of 2024, the tax rate for diesel fuel in Illinois is significantly higher than many neighboring states, often exceeding $0.60 per gallon when combining the base rate and the surcharge. For example, the total rate often fluctuates between $0.65 and $0.70 per gallon depending on the annual adjustments made by the IDOR based on the Consumer Price Index. Carriers must track the exact number of gallons purchased within Illinois versus the gallons consumed to determine if they owe additional tax or are eligible for a credit.

Recordkeeping for Audits

The Illinois Department of Revenue mandates that all IFTA licensees retain records for four years from the filing date. These records must include detailed Individual Vehicle Distance Records (IVDR), which document the date of each trip, origin and destination, route of travel, total trip distance, and distance traveled in each jurisdiction. Fuel receipts must clearly show the date of purchase, name and address of the seller, number of gallons purchased, fuel type, and the unit number of the vehicle. If a carrier fails to maintain adequate records, IDOR may assess a tax based on a flat 4.0 miles per gallon (MPG) average, which often results in a significantly higher tax liability than actual operational data would suggest.

Electronic Filing via MyTax Illinois

Illinois has transitioned to a mandatory electronic filing system for IFTA through the MyTax Illinois web portal. Carriers must create an account to submit their quarterly returns and pay any taxes owed via ACH debit or credit card. The system automatically calculates the net tax due or credit by comparing the tax paid at the pump in various states to the tax owed based on total miles driven in those states. Credits earned in one quarter can be carried forward to future filings for up to eight quarters or requested as a refund if the credit balance exceeds a specific threshold, typically $25 or more.

Qualifying Vehicles and Exemptions

A qualified motor vehicle under Illinois IFTA rules is any vehicle used, designed, or maintained for the transportation of persons or property that has two axles and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds, has three or more axles regardless of weight, or is used in combination when the weight of such combination exceeds 26,000 pounds. Recreational vehicles are generally exempt. Additionally, certain miles driven on private property or using off-road fuel may be exempt from the tax, but these must be meticulously documented to withstand an IDOR audit. Illinois does not provide a general exemption for farm vehicles involved in interstate commerce if they meet the weight thresholds.

Sources

Illinois Department of Revenue (2024) — https://tax.illinois.gov/businesses/fuel/ifta.html International Fuel Tax Association, Inc. (2024) — https://www.iftach.org/ Illinois Compiled Statutes - Motor Fuel Tax Law (2024) — https://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=612

Frequently asked

What is the penalty for filing a late IFTA return in Illinois?

The penalty is $50 or 10% of the tax due, whichever is greater, plus a 1% monthly interest charge on the unpaid balance.

How much do IFTA decals cost in Illinois?

Illinois does not currently charge a fee for IFTA decals or the annual license, making it one of the few states with a $0 registration cost.

How long must I keep my fuel and mileage records in Illinois?

You are required to keep all IFTA-related records, including receipts and trip logs, for a period of 4 years.

Can I get a refund if I overpaid my fuel taxes?

Yes, if your quarterly return shows a credit balance, you can apply it to the next quarter or request a refund if the amount is $25 or more.

Does Illinois require IFTA for intrastate-only carriers?

No, if you only operate within the borders of Illinois and never cross state lines, you do not need an IFTA license, but you must still pay the standard Illinois Motor Fuel Tax at the pump.