What is the difference between a broker MC and a carrier MC?
A carrier MC authorizes the holder to physically transport freight or passengers as a motor carrier of property or passengers. A broker MC authorizes the holder to arrange transportation between shippers and carriers without physically transporting anything. The two authority types have completely different operational requirements: carriers need vehicles, drivers, and BIPD insurance; brokers need a $75,000 surety bond (BMC-84) or trust fund (BMC-85).
Carrier MC is the §365 motor-carrier-of-property authority issued via OP-1. The holder transports freight (or passengers, for OP-1(P)) for compensation in interstate commerce. Operating requirements include §391 driver qualifications, §392 driving practices, §393 vehicle equipment, §395 hours of service, §396 inspection-and-maintenance, and §387.9 BIPD insurance ($750,000 minimum for general freight).
Broker MC is the §365 broker-of-property authority issued via OP-1. The holder arranges for the transportation of property between shippers and motor carriers, taking a margin on the difference between what the shipper pays and what the carrier accepts. The broker does not own equipment, does not employ drivers, and does not transport anything — the work is contractual matching, not physical transport.
Broker financial responsibility under 49 CFR §387.301 is dramatically different from carrier BIPD. Brokers must file a $75,000 surety bond (Form BMC-84) or establish a trust fund (Form BMC-85) at the same $75,000 amount. The bond protects the carriers and shippers the broker contracts with — if the broker fails to pay a carrier, the bond covers the unpaid amount up to the bond limit. Brokers do not file BMC-91 BIPD insurance because they don't physically operate vehicles.
Some carriers operate under both MC types — a carrier MC for the carrier's own equipment runs and a broker MC for runs the carrier arranges using other carriers. The two MCs are issued under separate OP-1 applications and operate independently; the same legal entity can hold both. Combined operation is common at mid-size and larger fleets that have outgrown pure-asset capacity and use brokered freight to fill demand spikes.