UCR and MC Number Rules-What Carriers Must Know

Nov. 18, 2025, 6:52 p.m.
UCR and MC Number Rules: What Carriers Must Know
UCR vs MC Number

UCR and MC Number Rules: What Carriers Must Know

1. What is the UCR?

The Unified Carrier Registration (UCR) program is a federally mandated system for commercial motor carriers, brokers, freight forwarders, and leasing companies operating in interstate commerce. It requires these entities to register annually and pay fees based on the size of their fleet.

  • Purpose: Ensures that carriers contribute to the cost of motor carrier safety programs.

  • Applicable carriers: All interstate carriers, regardless of whether they carry freight for hire or themselves.

2. What is an MC Number?

The Motor Carrier (MC) Number is issued by the Federal Motor Carrier Safety Administration (FMCSA) to authorize a company to transport regulated commodities or passengers across state lines.

  • MC Numbers are required for:

    • For-hire carriers transporting regulated commodities.

    • Brokers arranging transportation for others.

    • Freight forwarders managing shipments across state lines.

  • Types of MC authority:

    • Common Carrier: Transporting goods for the public.

    • Contract Carrier: Transporting goods under specific contracts.

    • Broker Authority: Arranging shipments for others.

3. Key UCR Requirements

  1. Annual Registration: Every carrier with an MC Number must register each year by December 31.

  2. Fee Based on Fleet Size: Fees vary depending on the number of vehicles operated in interstate commerce.

  3. Who Must Register:

    • Carriers with U.S. DOT Numbers and MC Numbers.

    • Freight brokers and leasing companies operating interstate.

  4. Consequences for Non-Compliance:

    • Fines starting at $100 per day.

    • Carrier may be deemed out-of-service.

    • Impact on FMCSA safety record and compliance ratings.

4. MC Number Rules

  • Obtaining an MC Number: Requires proof of insurance, a U.S. DOT Number, and in some cases, a surety bond or trust fund.

  • Maintaining Authority:

    • Keep insurance and bond active.

    • Update FMCSA on any business changes.

  • Display: MC Number must be displayed on all commercial vehicles engaged in interstate operations.

5. UCR and MC Interplay

  • UCR registration is tied to your MC Number: If you hold an active MC Number, you must register for UCR.

  • Failure to maintain either: Can result in FMCSA penalties and state enforcement actions.

  • Tips for Carriers:

    • Register early to avoid late penalties.

    • Double-check fleet size and fee tier to avoid underpayment.

    • Keep records of UCR registration confirmation.

6. State vs. Federal Rules

  • UCR is federal, but fees are collected and administered by member states.

  • Certain intrastate carriers may also need registration depending on state laws.

  • Always check your home state requirements alongside federal UCR rules.

7. Practical Advice

  • Maintain both UCR registration and MC number compliance to operate legally interstate.

  • Use the source below only:

  • Best Practices:

    • Set annual reminders for UCR registration.

    • Keep MC authority documents updated.

    • Train dispatchers and compliance officers on requirements.