Motor Carrier Registration is the FMCSA process by which interstate motor carriers, certain intrastate hazardous materials carriers and intermodal equipment providers identify themselves to the federal government and receive a USDOT number. Carriers file the Motor Carrier Identification Report (Form MCS-150) before they begin operating, update it every 24 months on a schedule tied to their USDOT number, and mark their vehicles with the number.
The USDOT number is how FMCSA, state enforcement officers, shippers and insurers track a carrier's inspections, crashes, audits and safety record. A carrier with an outdated registration can have its USDOT number deactivated, which means its trucks and buses may not legally operate. Registration is also the first step into FMCSA's oversight programs, including the new entrant safety audit and the Safety Measurement System.
What Is Motor Carrier Registration?
The registration requirements carriers follow today are in the temporary section 49 CFR 390.19T, along with the vehicle marking rules in 390.21T. FMCSA has adopted permanent replacements, 390.19 and the Unified Registration System rules in Subpart E of Part 390 (including 390.201), but those sections are suspended indefinitely and have not taken effect. FMCSA's registration pages describe the current filing process.
Under 390.19T, each motor carrier and intermodal equipment provider must file one of three forms:
- Form MCS-150: interstate motor carriers domiciled in the United States, Canada, Mexico or elsewhere
- Form MCS-150B: carriers that need a hazardous materials safety permit under Part 385, Subpart E, including intrastate carriers, which combines the identification report with the permit application
- Form MCS-150C: intermodal equipment providers that offer equipment for interstate transportation
Who Must Comply?
A carrier needs a USDOT number if it operates commercial motor vehicles in interstate commerce. Under 49 CFR 390.5, that generally includes vehicles that:
- Have a gross vehicle weight rating or gross combination weight rating, or actual weight, of 10,001 pounds or more
- Are designed or used to transport more than 8 passengers, including the driver, for compensation
- Are designed or used to transport more than 15 passengers, including the driver, not for compensation
- Transport hazardous materials in a quantity requiring placards
Private carriers that haul their own goods need a USDOT number just as for-hire carriers do. Intrastate carriers transporting hazardous materials that require a safety permit must also register, and many states require USDOT numbers for intrastate carriers under their own laws. Carriers hauling hazardous materials should check both federal and state rules.
Key Requirements
Filing before operations begin (390.19T(b))
A carrier must file its identification report before it begins operations. FMCSA issues a USDOT number after processing the form. Some applicants, such as Mexico-domiciled carriers seeking authority beyond the border commercial zones and non-North America-domiciled carriers, must also pass a pre-authorization safety audit, and the number is not issued until any protest period ends or any protest is resolved.
Biennial update (390.19T(b))
Every carrier must update its MCS-150 information every 24 months, even if nothing has changed. The schedule depends on the last two digits of the USDOT number:
- Month: the last digit sets the month the update is due: 1 is January, 2 is February, and so on through 9 for September, with 0 for October.
- Year: if the next-to-last digit is odd, the update is filed in odd-numbered years. If it is even, the update is filed in even-numbered years.
For example, a carrier with a USDOT number ending in 47 files its update every July in even-numbered years. The update covers company information, operation type, cargo, number of vehicles and drivers, and annual mileage.
Accurate information and legal name
Carriers may use only their legal name or a single trade name on the registration forms. Filing false or misleading information is subject to civil penalties under 49 U.S.C. 521(b)(2)(B). Vehicle counts, driver counts and mileage matter because FMCSA uses them to calculate crash rates and to prioritize interventions.
Vehicle marking (390.21T)
Self-propelled CMVs must display the carrier's legal name or a single trade name and the letters "USDOT" followed by the USDOT number. The marking must appear on both sides of the vehicle, contrast sharply with the background, and be readable during daylight hours from 50 feet while the vehicle is stationary. Intermodal equipment providers must identify each piece of interchanged equipment with their USDOT number.
PRISM states
Carriers that register their vehicles in a state participating in the Performance and Registration Information Systems Management (PRISM) program may file the required information through that state, and the state passes it to FMCSA.
Operating Authority and Other Registrations
A USDOT number identifies the carrier for safety purposes. It is not the same as operating authority. For-hire carriers that transport regulated commodities or passengers in interstate commerce, along with brokers and freight forwarders, generally also need operating authority under 49 CFR Part 365, which has traditionally been issued with an MC, FF or MX docket number. Operating authority requires:
- A designation of process agents in each state (Form BOC-3) under Part 366
- Proof of insurance or other financial responsibility filed with FMCSA
Private carriers and for-hire carriers hauling only exempt commodities generally do not need operating authority but still need a USDOT number. Most interstate carriers, brokers and freight forwarders must also pay annual Unified Carrier Registration fees, which are administered by participating states rather than through the MCS-150.
Changes Underway at FMCSA
FMCSA is moving registration into a new online system called Motus, with the first phases rolling out in 2025 and 2026. FMCSA has also said it is considering using the USDOT number as the single identifier for all registrants and no longer assigning MC numbers, but that change requires a proposed rule and public comment and was not final as of late 2026. Carriers should follow FMCSA announcements and keep their current numbers active until FMCSA says otherwise.
Penalties and Enforcement
Under 390.19T, a carrier that fails to complete its biennial update is subject to civil penalties and to deactivation of its USDOT number. Operating CMVs in interstate commerce with an inactive or deactivated USDOT number can lead to penalties and out-of-service orders. Operating without required operating authority, or after authority is revoked, is subject to separate penalties under 49 U.S.C. 14901. Civil penalty amounts are adjusted annually for inflation. Incorrect vehicle markings are a common roadside violation.
Common Compliance Mistakes
- Missing the biennial update because nothing changed
- Reporting outdated vehicle, driver or mileage figures, which distorts crash rates and CSA measures
- Assuming a USDOT number is the same as operating authority
- Letting insurance or process agent filings lapse, which can lead to revocation of authority
- Marking vehicles with a name that does not match the registration
- Responding to unofficial "compliance" mailers that imitate FMCSA instead of filing through FMCSA's own systems
How to Comply: Step by Step
- Determine what you need. Confirm whether your vehicles and operations require a USDOT number, operating authority, a hazardous materials safety permit or state registration.
- Register before operating. File the correct form through FMCSA's registration system and keep the confirmation.
- Complete authority filings. For for-hire operations, file insurance and a BOC-3 and wait for authority to be granted before operating.
- Mark your vehicles. Apply the legal or trade name and USDOT number on both sides of each power unit.
- Calendar your biennial update. Work out your due month and year from the last two digits of your USDOT number.
- Keep data current. Review vehicle and driver counts and mileage at each update and whenever your operation changes significantly.
- Monitor your status. Check your public registration record periodically to confirm the number and authority are active.
How SMS360 Helps
SMS360's DOT Compliance module helps carriers keep registration records, biennial update due dates and filing confirmations in one place, with reminders before deadlines. Vehicle Management keeps vehicle lists and marking checks current for accurate vehicle counts, and the Document Library stores insurance certificates and authority documents.
Frequently Asked Questions
How often must I update my MCS-150?
Every 24 months. The due month is set by the last digit of your USDOT number, and the year by whether the next-to-last digit is odd or even.
What happens if I miss my biennial update?
FMCSA may deactivate your USDOT number and assess civil penalties. A carrier with a deactivated number may not operate CMVs in interstate commerce until it is reactivated.
Do private carriers need a USDOT number?
Yes. Any carrier operating qualifying CMVs in interstate commerce needs a USDOT number, whether it hauls for hire or its own goods. Private carriers generally do not need operating authority.
Are MC numbers going away?
FMCSA has said it is considering dropping MC numbers in favor of the USDOT number alone, but this requires rulemaking with public comment. Until FMCSA completes that process, carriers that need operating authority should keep their existing docket numbers active.
