People use "DOT number" and "MC number" like they mean the same thing. They do not. They do two different jobs.
Sometimes you need both. Here is how to tell.
The USDOT number says who you are
A USDOT number is your business's ID in the federal safety system. Think of it as your federal ID number for running trucks. It is how FMCSA tracks your record: your inspections, your crashes, your audits.
You need one if you run trucks across state lines. Most states want one for in-state work now too. It answers one question: "who is this carrier?"
The MC number says what you're allowed to do
An MC number, also called a docket number, is your operating authority. It is federal permission to haul freight for money across state lines, or to broker that freight for a fee. It answers a different question: "are you allowed to run this business?"
An MC number is more work than a USDOT number. You have to carry insurance, or a bond if you are a broker. You need a BOC-3 on file. Then you wait out a review period before it goes live.
Who needs which
The simplest way to think about it:
- Hauling your own goods, not for hire? A USDOT number, and usually that is it.
- Hauling other people's freight across state lines for money? You need both.
- Broker or freight forwarder? Both as well. The USDOT number names the business. The MC lets you arrange the loads.
The USDOT number comes first, then the MC
Your USDOT number comes first. The MC sits on top of it, when your business needs one. Both are handled in Motus, FMCSA's 2026 registration system.
FMCSA has talked for years about dropping the MC number and using the USDOT number alone. It has not happened. Docket numbers are still being issued today, so if you need authority now, you still get one.
How Foundation Freight helps
We work out which registrations your operation needs, then file them in Motus. Your USDOT, your MC authority, the BOC-3, your UCR.
No guessing whether you need one number or both. Veteran-owned, one flat price, federal fees included.
Foundation Freight is an independent filing and compliance service. We are not part of FMCSA, USDOT, or any government agency. What you have to register for depends on your operation, and the rules change, so check your own obligations in the official FMCSA systems.