TL;DR: A USDOT number identifies your company for safety regulation and is required for interstate commercial vehicles. An MC number is operating authority, required to haul regulated freight for hire across state lines. Private carriers and exempt-commodity haulers can run on a USDOT number alone. For-hire general freight needs both, plus insurance filed against the authority.
What is a USDOT number?
The USDOT number is your company's identifier in FMCSA's safety systems. It ties together your inspections, crash records, audits, and compliance history. Anyone operating commercial motor vehicles in interstate commerce needs one, and many states require USDOT numbers for intrastate trucking too. Getting a USDOT number does not, by itself, let you charge money to haul someone else's freight.
What is an MC number?
The MC number, formally operating authority, is FMCSA's permission to work as a for-hire carrier of regulated commodities in interstate commerce. Brokers and freight forwarders hold their own versions of authority. Authority is what your insurance filings attach to: under 49 CFR 387.301, a for-hire carrier's authority cannot be issued or stay in force without the required liability security on file.
Who needs which number?
| Operation | USDOT number | MC number |
|---|---|---|
| For-hire carrier, regulated freight, interstate | Yes | Yes |
| Private carrier hauling its own goods | Yes | No |
| Exempt commodities only, such as most unprocessed agricultural products | Yes | No |
| Intrastate only, non-hazardous | State rules decide | No |
| Freight broker | No trucks to register | Broker authority |
The common mistake runs one way: assuming a USDOT number is enough to book brokered loads. It is not. Brokers check authority status, not just the USDOT record, before tendering freight.
Did FMCSA get rid of MC numbers?
No. FMCSA's Unified Registration System consolidated applications around the USDOT number, and the agency has discussed retiring the MC docket format for years. As of July 2026, MC numbers are still issued and still appear in FMCSA's Licensing and Insurance records. Write your MC number on carrier packets, keep it on file with brokers, and do not believe claims that it has been abolished until FMCSA publishes that change.
How does insurance attach to each number?
Safety regulation follows the USDOT number, but insurance filings follow authority. Your insurer's BMC-91 or BMC-91X certificate posts against your docket, proving liability coverage at the level 49 CFR 387.303 requires, which for for-hire general freight in vehicles 10,001 pounds and heavier has been $750,000 since January 1, 1985. The MCS-90 endorsement sits on the policy itself. If you hold both carrier and broker authority, each needs its own security: liability filings for the carrier side, a $75,000 BMC-84 bond or BMC-85 trust for the broker side.
What does activation look like in practice?
You apply once through FMCSA's registration system and receive the USDOT number first. The authority then goes through publication in the FMCSA Register, a 10-day protest window, and the insurance and BOC-3 filing requirements, which must be met within 20 days of publication under 49 CFR 365.109T. Only when the grant issues can you legally haul for-hire regulated freight across state lines. Check both numbers on FMCSA's public website before your first dispatch: the USDOT record should show your operation type, and the authority record should show active with insurance on file.
Can one company hold several authorities?
Yes, and many do. A carrier can add broker authority to sell overflow freight, or a broker can add carrier authority to run its own trucks. Each authority carries its own filing requirements and its own revocation risk if security lapses. Keep them separately funded and separately monitored, because a lapse on one does not just hurt that side, it flags your whole operation to brokers and shippers who run authority checks.
Real questions new authorities and owner-operators ask
Can I haul loads with only a USDOT number?
Only your own goods or exempt commodities. Hauling regulated freight for hire in interstate commerce requires operating authority, the MC number, with liability insurance filed against it. Brokers verify authority status before tendering loads, so a USDOT number alone will not book freight.
Do I need an MC number for intrastate trucking?
No, MC authority covers interstate for-hire operations. Intrastate rules come from your state, which may require its own permit, filings, and insurance minimums. If you later cross state lines for pay, you will need federal authority before that first trip.
Is the MC number going away?
FMCSA has proposed retiring the MC docket format, but as of July 2026 MC numbers are still issued and still shown in FMCSA records. Keep using yours. If FMCSA completes the transition, your authority continues, only the identifier format changes.
Which number do my insurance filings attach to?
Filings post against your operating authority docket. The BMC-91 or BMC-91X proves liability coverage for carrier authority, and a BMC-84 bond or BMC-85 trust backs broker authority. Safety data, such as inspections and crashes, follows your USDOT number instead.
Do exempt commodity haulers need insurance filings?
They skip the authority filing, but state and market requirements still apply, and most shippers require $1,000,000 liability and cargo coverage by contract. Exempt status changes the paperwork with FMCSA, not the real-world need for coverage.
Why truckers work with Morrow
- We know the filings. Morrow lines up the liability filing your MC number needs and confirms your USDOT record shows the right operation type.
- New authority is our normal. First-year carriers pay the most and get declined the most. We work with markets that actually want new ventures and we tell you what the first renewal takes.
- Certificates and filings, fast. Certificates of insurance the same business day for most carriers, and federal or state filings submitted electronically so your authority is not sitting in a queue.
- We quote the whole picture. Liability, cargo, physical damage, and the endorsements shippers and brokers actually check for, priced together so nothing is missing when a load is on the line.
- Real people when something goes wrong. A claim, a lapse notice, or a lost certificate gets a person, not a portal.
Related trucking guides
Short answers to the surrounding questions truckers ask next.
- Trucking insurance at Morrow (start here)
- Insurance you need to get an MC number
- FMCSA filing timeline and the 20-day rule
- BMC-84 vs BMC-85 broker surety bond
- What is an MCS-90 endorsement?
- Trucking and transportation insurance overview
This guide is general information, not legal, tax, or insurance advice. Limits, forms, and deadlines change, so verify current requirements with FMCSA before you rely on them. Morrow is a brand name of Afthonea Inc. Last updated: July 2026.