An MC number (Motor Carrier number) is your federal authorization to operate as a for-hire carrier or broker in interstate commerce. Without it, transporting freight across state lines for compensation is illegal. The application process is straightforward but has several dependencies — a USDOT number, insurance filings, and a BOC-3 designation must all be in place before your authority becomes active.
This guide walks through who needs an MC number, how to apply, what it costs, and how long the process takes.
What Is an MC Number?
An MC number is a unique identifier assigned by FMCSA that grants operating authority to for-hire carriers, freight brokers, and freight forwarders operating in interstate commerce. It is different from a USDOT number — the USDOT number identifies your company for safety tracking and is required for all CMV operators, while the MC number specifically authorizes you to haul freight for compensation across state lines.
Who needs an MC number:
- For-hire carriers — any company that transports property or passengers for compensation in interstate commerce
- Freight brokers — companies that arrange the transportation of freight without operating trucks themselves
- Freight forwarders — companies that assemble and consolidate shipments
Who does NOT need an MC number:
- Private carriers — companies hauling their own goods in their own trucks (they still need a USDOT number)
- Carriers operating only within one state — intrastate-only operations are governed by state regulations, not FMCSA
- Exempt commodities — certain agricultural and livestock hauls are exempt from MC authority requirements
MC Number vs USDOT Number
These are frequently confused. Here is the key difference:
| USDOT Number | MC Number | |
|---|---|---|
| Purpose | Safety identification and tracking | Operating authority for for-hire interstate commerce |
| Who needs it | All CMV operators in interstate commerce | For-hire carriers, brokers, and forwarders |
| Cost | Free | $300 application fee |
| Biennial update | Required every 2 years | No biennial update — authority is ongoing until revoked |
Most for-hire carriers need both. You apply for the USDOT number first, then use it when applying for MC authority.
Step-by-Step Application Process
Step 1: Get Your USDOT Number
If you do not already have a USDOT number, apply for one through the FMCSA Unified Registration System (URS) at portal.fmcsa.dot.gov. This is free and can be done at the same time as the MC number application.
Step 2: Apply for MC Authority
Through the same FMCSA URS portal:
- Log in or create an account
- Select "Apply for New Registration" or "Add Authority Type" if you already have a USDOT number
- Choose the type of authority you need (motor carrier of property, broker, or freight forwarder)
- Provide your legal business name, DBA (if applicable), EIN, business address, and entity type
- List the types of cargo you intend to haul
- Pay the $300 application fee (per authority type — if you apply for both carrier and broker authority, the total is $600)
Step 3: File Your BOC-3
A BOC-3 (Blanket of Coverage — Designation of Process Agents) designates a process agent in every state where you operate. A process agent is authorized to receive legal documents on your behalf. This is required before your authority can become active.
You can file through a BOC-3 service company for approximately $30-$50. They handle the filing with FMCSA and designate agents in all 50 states plus Washington, DC.
Step 4: Obtain Insurance and File Proof
Your insurance provider must file proof of coverage directly with FMCSA:
- Carriers: BMC-91 (surety bond) or BMC-91X (trust fund agreement) for liability coverage — minimum $750,000 for general freight
- Brokers: BMC-84 (surety bond) or BMC-85 (trust fund) for $75,000
Your authority will not become active until FMCSA receives these filings. Contact your insurance provider as soon as you submit your application so the filings happen in parallel.
Step 5: Wait for Processing
After your application, BOC-3, and insurance filings are all received, FMCSA publishes your authority application in the Federal Register for a 10-day protest period. If no protests are filed (which is typical for carrier applications), your authority transitions to active status.
Total timeline: Approximately 3-4 weeks from initial application to active authority, assuming you file insurance and BOC-3 promptly. Delays in insurance filings are the most common reason for extended timelines.
Provisional vs Active Authority
When your MC number is first issued, it is in provisional (pending) status. During this period, you cannot legally operate. Your authority becomes active only after:
- Your BOC-3 is on file with FMCSA
- Your insurance filing (BMC-91/91X or BMC-84/85) is on file
- The 10-day protest period has passed without objection
You can check your authority status on the FMCSA SAFER system (safer.fmcsa.dot.gov) by searching your MC or USDOT number.
After Your Authority Is Active
Once active, you must comply with several ongoing requirements:
- New Entrant Safety Audit — FMCSA will schedule a safety audit within 18 months of your authority grant date
- UCR (Unified Carrier Registration) — annual registration and fee based on fleet size
- IFTA and IRP — fuel tax and apportioned registration if operating in multiple jurisdictions
- Maintain insurance — any lapse triggers automatic suspension of your authority
- DOT compliance — DQ files, HOS, drug testing, vehicle maintenance programs
Common Mistakes
- Hauling freight before authority is active — your MC number exists but is not active until all filings are complete. Operating during the pending period is illegal.
- Not filing BOC-3 — some new carriers forget this step, delaying activation by weeks.
- Insurance delays — start the insurance process before or simultaneously with your MC application, not after.
- Wrong authority type — make sure you apply for the correct type (property carrier vs broker vs passenger).
- Not budgeting for all startup costs — the $300 fee is just the beginning. See the trucking business plan guide for a full startup cost breakdown.
Key Takeaways
Getting an MC number is a multi-step process that requires coordination between your FMCSA application, BOC-3 filing, and insurance provider. Budget $300 for the application, $30-$50 for the BOC-3, and start your insurance process early. Plan for 3-4 weeks from application to active authority, and do not book any loads until your authority status shows as active in the FMCSA SAFER system.