MC Number vs USDOT Number, and What Motus Changed

New carriers hear "DOT number" and "MC number" in the same breath, and they're easy to mix up. They're different things: one identifies your company for safety, the other is your permission to haul other people's freight for pay across state lines. Here's what each one is, which you need, and what FMCSA's new registration system changed.

The short answer

What a USDOT number is

Your USDOT number is FMCSA's ID for your company. Every roadside inspection, crash report and safety audit is recorded against it, and it's what you'll see on the SAFER company snapshot.

You need one if you operate a commercial motor vehicle in interstate commerce. That generally means a vehicle or combination over 10,000 lbs, one that carries placarded hazmat, or certain passenger vehicles.

Many states also require a USDOT number for intrastate carriers, sometimes at different weight thresholds. A USDOT number alone doesn't let you haul other people's freight for pay across state lines. That's what the MC number is for.

What an MC number is

MC stands for motor carrier. The MC number is the docket number FMCSA assigns when it grants operating authority. That's your permission to haul regulated freight for pay across state lines. Brokers and freight forwarders get their own authority types with their own docket numbers.

Getting it takes four things. You pay a $300 filing fee per authority type, and FMCSA publishes your request in its Register for a 10-day protest period. You also need a BOC-3 filing and proof of insurance filed by your insurer. FMCSA explains the process on its operating authority page, and our new authority guide walks through the first 90 days.

Which do you need?

The exempt commodity rules are narrower than many people think, and a load can lose its exempt status once a product is processed. If you plan to rely on an exemption, check the rules carefully. For most owner-operators hauling broker freight, the answer is simple: you need both. Our guides to starting a box truck business and starting hotshot walk through the whole setup.

What Motus changed

FMCSA moved registration to a new system called Motus between late 2025 and 2026. According to Benesch's summary, the main changes for carriers are:

• Login.gov accounts for anyone managing a USDOT registration, including existing carriers
• Identity verification of the company official, with a government ID and a face scan
• A real principal place of business where records are kept, with checks that flag shared mail drops
• One place for registration work, including applications, updates and the biennial MCS-150 update

These changes target registration fraud: fake carriers, hijacked accounts and cloned identities. If you haven't claimed your USDOT number in Motus with your own Login.gov account, do it now. Our guide to carrier identity theft explains why it matters.

Treat your Login.gov credentials like a bank password. Anyone with access to your registration can change your contact details. Fraudsters use exactly that to redirect broker payments or book loads in your name. Keep the login with the company official, not a vendor or a dispatcher.

Are MC numbers going away?

Not yet. FMCSA has talked for years about moving to the USDOT number as the single identifier, with a suffix showing the type of authority. But the Motus rollout kept MC numbers, and eliminating them would take a formal rulemaking with public comment. Brokers still ask for your MC number on every setup packet and rate confirmation.

If that changes, your USDOT number will matter even more, since it would carry your authority status too. Keep it accurate and keep your login secure.

Common mix-ups

• "I have a DOT number, so I can haul for brokers." Not across state lines. For-hire interstate freight needs active operating authority too.
• "My MC was granted, so I can haul today." Not yet. Your authority must show active first, after the protest period and with your insurance and BOC-3 on file.
• "My USDOT number is inactive, but my MC is fine." Brokers check both. An inactive USDOT number, often from a missed MCS-150 update, can stop loads.
• "I'll use a friend's MC until mine is active." Hauling under someone else's authority without a proper lease is a fast way into trouble with insurance and the law.
• "Exempt freight doesn't need anything." Exempt commodities can skip operating authority, but you still need a USDOT number and safety compliance for a commercial vehicle.

Keeping both in good standing

• Keep insurance on file. A lapsed insurance filing can lead to your authority being revoked.
• Keep your BOC-3 current if you change process agent companies.
• Update your MCS-150 every two years, on the schedule set by your USDOT number, and whenever your details change. Our MCS-150 due date tool finds your month.
• Pay your UCR every year.
• Check your SAFER snapshot regularly for errors or changes you didn't make.

Our compliance calendar puts all of these dates in one place. When your MC is active and your insurance is on file, see what you need to start dispatch with us.