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MC Number Guide

MC number basics for for-hire interstate carriers, including operating authority, insurance, BOC-3, and active-status checks.

Quick Answer

An MC number (motor carrier docket number or operating authority) is required for for-hire carriers transporting regulated property or passengers in interstate commerce — it is separate from the USDOT number, requires additional insurance and BOC-3 filings, and must be active before any for-hire dispatching begins.

Authority and registration topics often connect to BOC-3, UCR, and new-authority sequencing. New Authority Checklist, BOC-3, UCR.

Who This Applies To

For-hire motor carriers transporting regulated property or passengers in interstate commerce who need operating authority in addition to a USDOT number.
Carriers checking current authority status before accepting a load — active, pending, revoked, and inactive are different states with different operational implications.
New carriers or brokers working through the authority application process for the first time and navigating the protest period, insurance filing, and BOC-3 requirements.
Carriers who held authority previously and are reinstating after a lapse, revocation, or entity change.

What To Verify

Current authority status in FMCSA SAFER by searching the MC number or USDOT number. The status must show 'Active' before any for-hire dispatch — approval is not the same as activation.
That required insurance is on file with FMCSA and that BOC-3 is designated in the authority record. Both must appear in SAFER; a submission receipt is not confirmation.
Whether the operation type requires a specific authority category. Property carrier, household goods carrier, passenger carrier, broker, and freight forwarder each have different authority designations, insurance minimums, and bond requirements.
After authority reinstatement, that the SAFER record accurately reflects active status and that BOC-3 is current — a prior filing may not carry through a revocation-and-reinstatement cycle.

Step-by-Step Overview

Confirm the correct authority type before applying. For-hire property carriers need motor carrier authority; brokers need broker authority; both are available in the FMCSA Unified Registration System but are separate applications.
Apply through the URS and pay the application fee. Note the docket number assigned — this is the MC number, and it is referenced in all subsequent filings.
After receiving the approval notice, engage a registered process agent company for BOC-3. Also file required insurance forms (typically BMC-91 or BMC-91X for property carriers) with FMCSA.
Wait for the 10-day protest period to close and for both BOC-3 and insurance to appear confirmed in SAFER. Check SAFER directly — don't assume activation based on filing receipts.
Once active, monitor the authority status annually. Insurance lapses and biennial MCS-150 update failures are the two most common causes of authority going inactive or delinquent.

Common Mistakes

Accepting loads before authority shows as active in SAFER. The approval notice marks the start of the protest period, not the activation of authority. These are separate events with days between them.
Having a USDOT number and assuming that covers for-hire operations. A USDOT number is a safety registration. MC operating authority is a separate permission to transport regulated freight for compensation.
Not checking authority status before each operating year. Insurance lapses, which can happen without the carrier noticing, cause authority to deactivate automatically in FMCSA systems.
Filing insurance or BOC-3 and assuming FMCSA has processed it. Processing takes time. Verify that both appear in the SAFER record, not just that they were submitted.
Applying for carrier authority when broker authority was intended, or vice versa. The two have different requirements and different consequences. Read the application type carefully before paying the fee.

Official Sources

Get Operating Authority (Docket Number) Federal Motor Carrier Safety Administration · federal-government · accessed 2026-05-06
Use for FMCSA operating authority concepts, timing caveats, and official fee references when current.
49 CFR Part 387 — Minimum Levels of Financial Responsibility for Motor Carriers Electronic Code of Federal Regulations · federal-government · accessed 2026-05-06
Primary regulatory source for FMCSA insurance minimum levels: 49 CFR 387.9 sets cargo liability minimums ($750,000 general freight; $1M/$5M hazmat); 49 CFR 387.307(a) sets broker/forwarder surety bond minimum ($75,000).
Insurance Filing for Motor Carriers, Freight Forwarders and Broker Surety Bonds Federal Motor Carrier Safety Administration · federal-government · accessed 2026-05-06
Use for FMCSA insurance filing process references: form numbers, filing methods, minimum coverage requirements, and confirmation in SAFER.

New Authority Checklist

A practical checklist for newly formed trucking authorities, including USDOT, operating authority, BOC-3, UCR, and records.

BOC-3 Guide

BOC-3 process agent filing: who must file, why only registered blanket agents can submit the form, and why authority cannot activate without it on file with FMCSA.

UCR Guide

Who must register under UCR annually, how fleet size determines the fee bracket, and why registering for the wrong year is the most common compliance gap.

FAQ

What is the difference between a USDOT number and an MC number?

A USDOT number is a safety registration identifier. An MC number (operating authority) is the permission to transport regulated freight or passengers for compensation in interstate commerce. Most for-hire interstate carriers need both; private carriers transporting their own goods typically need only the USDOT number.

What insurance forms must a motor carrier file with FMCSA, and what are the minimum amounts?

Property carriers file Form BMC-91 or BMC-91X showing minimum cargo liability coverage. The minimum for general freight is $750,000 under 49 CFR 387.9. Hazmat carriers face higher minimums — $1 million or $5 million depending on the specific commodity. The carrier's insurance company typically files the form directly with FMCSA. Verify the correct minimum for the specific cargo type before dispatch.

Can a carrier hold both motor carrier authority and broker authority under the same MC number?

No. Motor carrier authority and broker authority are separate designations with separate MC numbers. A company operating as both a carrier and a broker holds two different MC numbers, each with its own BOC-3 designation, insurance or surety bond filing, and UCR registration requirement. Each authority type must be maintained independently.