Missouri IFTA Compliance and Fuel Tax Reporting Guide

The International Fuel Tax Agreement (IFTA) is a reciprocal agreement between the lower 48 U.S. states and Canadian provinces, simplifying the reporting of fuel use by motor carriers operating in multiple jurisdictions. In Missouri, the program is administered by the Missouri Department of Transportation (MoDOT) Motor Carrier Services. Carriers based in Missouri who operate qualified motor vehicles—defined as having two axles and a gross vehicle weight exceeding 26,000 pounds, or having three or more axles regardless of weight—must register for an IFTA license to remain compliant with state and federal regulations. Filing IFTA returns accurately is critical to avoiding audits and interest penalties. Missouri requires carriers to submit quarterly tax returns even if no taxable miles were driven during the period. Proper record-keeping of all miles traveled and all gallons of fuel purchased is mandatory. DispatchTool helps carriers manage this burden by automatically tracking mileage across state lines, allowing users to export precise jurisdiction-specific distance data for their Missouri IFTA filings. Create a DispatchTool account to start organizing your trip records and fuel receipts for quarterly reporting.

Missouri IFTA Registration and Credentials

To register for IFTA in Missouri, carriers must have a business presence in the state and their fleet records must be maintained or reachable at a Missouri location. The application is filed through MoDOT Motor Carrier Services. Unlike many states, Missouri does not charge an application fee for the IFTA license or the initial set of two decals. However, carriers must renew their credentials annually by December 31. A grace period exists through February of the following year, provided the renewal application was submitted by December 31. Failure to display current year decals after the grace period can result in citations and fines starting at $150 or more depending on the local jurisdiction.

Missouri Fuel Tax Rates and Calculations

As of 2024, the Missouri state motor fuel tax rate for diesel is $0.295 per gallon, following a scheduled increase under Senate Bill 262. When filing the IFTA-100 form, carriers must calculate the net tax or refund due by comparing the tax paid at the pump to the tax owed based on the total miles driven in each jurisdiction. For example, if a truck averages 6.0 miles per gallon and travels 1,000 miles in Missouri, it consumes approximately 166.7 gallons. If the carrier purchased 200 gallons in Missouri, they would have a tax credit; if they purchased only 100 gallons, they would owe tax on the 66.7 gallon difference at the current $0.295 rate.

Quarterly Filing Deadlines and Penalties

Missouri IFTA returns are due on the last day of the month following the close of the quarter. The specific deadlines are April 30 (Q1), July 31 (Q2), October 31 (Q3), and January 31 (Q4). If the deadline falls on a weekend or state holiday, the return is due the next business day. MoDOT imposes a late filing penalty of $50.00 or 10% of the total tax due, whichever is greater. Furthermore, interest is charged on all delinquent taxes at a rate of 1% per month. Carriers are encouraged to file electronically through the MoDOT Carrier Express portal to ensure timely processing and to receive immediate confirmation of receipt.

Record Keeping Requirements for Audits

Per Missouri Revised Statutes and IFTA Articles of Agreement, carriers must retain records for four years from the filing date. These records must include Individual Vehicle Mileage Records (IVMR) showing the date of trip, trip origin and destination, routes of travel, beginning and ending odometer readings, and total distance traveled in each jurisdiction. Fuel records must include original receipts or invoices showing the number of gallons purchased, fuel type, price per gallon, and the name and address of the seller. Missouri auditors frequently look for continuity in odometer readings; any gaps in mileage can lead to the assessment of tax based on an assumed 4.0 MPG, significantly increasing the tax liability.

Qualified Motor Vehicle Criteria

Not every commercial vehicle requires an IFTA license in Missouri. A 'Qualified Motor Vehicle' is one used, designed, or maintained for the transportation of persons or property and meets one of three criteria: having two axles and a gross vehicle weight or registered gross vehicle weight exceeding 26,000 pounds (11,797 kilograms); having three or more axles regardless of weight; or being used in combination when the weight of such combination exceeds 26,000 pounds. Recreational vehicles are exempt from IFTA requirements unless they are used for business purposes. Carriers operating vehicles below these thresholds but engaged in interstate commerce may still need a USDOT number but are not required to participate in the IFTA fuel tax program.

Exemptions and Non-Taxable Miles

Missouri allows for certain mileage exemptions, though these are limited compared to some other jurisdictions. Toll road miles are generally taxable, but miles driven by vehicles owned by the United States government, the state of Missouri, or any political subdivision thereof are exempt. Additionally, Missouri participates in the IRP and IFTA, but does not offer a specific 'off-road' fuel refund through the IFTA return for idling or Power Take-Off (PTO) usage. If a carrier uses dyed diesel for off-road purposes, that fuel is already tax-exempt but cannot be used in a qualified motor vehicle on public highways under Missouri law and IRS regulations.

Sources

Missouri Department of Transportation (MoDOT) (2024) — https://www.modot.org/ifta-international-fuel-tax-agreement IFTA, Inc. Official Rate Table (2024) — https://www.iftach.org/ Missouri Revised Statutes Chapter 142 (2023) — https://revisor.mo.gov/main/OneChapter.aspx?chapter=142

Frequently asked

How much does it cost to get IFTA decals in Missouri?

Missouri is one of the few states that does not charge a fee for the IFTA license or the two required vehicle decals. However, you must be in good standing with all state taxes and have an active USDOT number to receive them.

What is the penalty for filing my Missouri IFTA return late?

The penalty is $50.00 or 10% of the net tax due, whichever is greater. Additionally, interest accrues at a rate of 1% per month on any unpaid balance.

Can I file my Missouri IFTA report by mail?

While paper returns are technically accepted, MoDOT strongly recommends using the Carrier Express online system. Electronic filing reduces errors and ensures the return is timestamped before the midnight deadline on the 31st.

How long must I keep my fuel receipts in Missouri?

You must maintain all IFTA-related records, including fuel receipts and mileage logs, for a period of 4 years from the date the tax return was filed or was due to be filed.

Does Missouri charge tax on miles driven on the toll roads?

Missouri currently has very few toll facilities (such as the Lake of the Ozarks Community Bridge), but generally, IFTA requires all miles driven on public highways to be reported, and Missouri does not provide a fuel tax exemption for toll road mileage.