DOT Number vs. MC Number: Which Do You Need?
By Authority Launcher · Updated October 29, 2026
Quick answer: A USDOT number identifies your company for safety tracking. An MC number is operating authority, which is FMCSA's permission to haul regulated freight for pay across state lines or to broker freight. Most new trucking companies hauling freight for customers in interstate commerce need both.
Side-by-side
| USDOT number | MC number | |
|---|---|---|
| What it is | Safety identifier | Operating authority |
| Who needs it | Interstate commercial vehicles meeting size or cargo thresholds (and many intrastate carriers, depending on the state) | For-hire interstate carriers of regulated freight, brokers and freight forwarders |
| FMCSA fee | Free | $300 per authority type |
| Insurance filing required | No federal filing for private carriers | Yes (BMC-91/91X, or bond for brokers) |
| BOC-3 required | No | Yes |
Examples
- You haul loads for brokers and shippers across state lines: you need a USDOT number and an MC number.
- You only haul your own company's products across state lines (private carrier): you need a USDOT number but usually not an MC number.
- You only operate within one state: you may need a USDOT number or a state number depending on your state's rules, but not an MC number.
- You arrange freight but don't own trucks: you need broker authority (an MC number) and a $75,000 surety bond or trust fund.
When is a USDOT number required?
In interstate commerce, generally when a vehicle or combination is over 10,001 lbs, carries certain numbers of passengers, or hauls placarded hazardous materials. FMCSA's USDOT Wizard gives a definitive answer for your situation.
Frequently asked questions
Can I get both at the same time?
Yes. In FMCSA's Motus system, new registrants can apply for a USDOT number and operating authority as part of the same registration process.
Is the MC number being eliminated?
Not yet. FMCSA has deferred that change to a later phase.
Related: How to get an MC number · Motus explained
Ready to start? Answer a few plain-English questions and we'll pre-fill every answer FMCSA asks for, show your fees up front, and walk you through filing in Motus. It's free to file it yourself.