Coverage Risks When Your Fleet Runs Multiple MC Numbers

Reviewed by Cameron Pechia, Founder, WA Insurance License 71186
Last reviewed: 5/28/2026

Key takeaway: Multiple MC numbers insurance is rarely as simple as one policy stretched across two authorities. Each MC number is a separate legal entity in the eyes of FMCSA, which means each one needs its own financial responsibility filings, its own liability limits, and often its own auto liability policy. Fleets running a carrier authority and a broker authority — or two carrier authorities for different divisions — are the most exposed. The risk shows up at claim time, when the wrong policy gets billed and one authority ends up uninsured for the loss.

You set up the second MC because the business demanded it. Maybe you added a brokerage to move freight you couldn’t haul yourself. Maybe you split off a flatbed division from your dry van operation. Maybe you bought another small fleet and never folded the authority into yours. Whatever the reason, the second MC made operational sense.

The insurance side rarely got the same attention.

That’s where this gets expensive. Most fleets running two authorities are insured like a fleet running one. The policy is in one name, the filings are on one MC, and nobody asked what happens when the other authority has a loss. I see this every quarter. Two authorities, one policy, one giant hole nobody noticed until something went wrong.

What does it mean to run multiple MC numbers?

An MC number is your operating authority — the registration that lets you legally move freight for compensation in interstate commerce. The Federal Motor Carrier Safety Administration issues MC numbers tied to specific business activities: motor carrier of property, motor carrier of household goods, broker of property, broker of household goods, and freight forwarder. A company may need to obtain multiple operating authorities to support its planned business operations, and separate fees must be submitted for each kind of authority sought.

When a fleet holds more than one MC number, each one is treated as a separate regulated entity. Each has its own filings. Each has its own insurance requirements. Each has its own compliance record. From the FMCSA’s perspective, they are not the same business — even if they share ownership, equipment, drivers, and an office.

That’s the part most owners miss. The IRS may see one company. The bank may see one company. FMCSA sees two.

Common reasons fleets end up with more than one authority

Three setups account for most of what I see:

• Carrier plus broker. The fleet hauls its own loads under a carrier MC and brokers overflow freight under a separate broker MC. A company can hold both broker and carrier authority, but it must keep its operations separate and comply with FMCSA rules that prevent self-dealing or misleading shippers.
• Two carrier divisions. A fleet operates dry van under one MC and flatbed, reefer, or tanker under another — often for risk separation, customer optics, or because a division was acquired and never merged.
• Inherited or acquired authority. The fleet bought a small operation, kept the MC active for goodwill or customer continuity, and now runs trucks under both numbers.

Each setup creates a different insurance problem.

Why one insurance policy almost never covers both authorities

Here’s the part the trucking forums get right and most owners learn the hard way. Your auto liability policy is tied to the named insured on that policy — usually one legal entity, one DOT number, one MC number. The insurance that the motor carrier you are leased to has is public liability, and that insurance is tied only to their US DOT number and cannot be shared with other motor carriers to be used to satisfy the FMCSA insurance requirements.

The same logic applies inside your own company. If your auto liability policy names Smith Trucking LLC with MC 123456, it does not automatically cover Smith Logistics LLC with MC 789012 — even if Smith Trucking owns Smith Logistics. The MCS-90 endorsement filed with FMCSA is filed under one MC. Policies of insurance, surety bonds, and endorsements required under this section shall remain in effect continuously until terminated, with cancellation effected by the insurer or the insured motor carrier giving 35 days’ notice in writing to the other.

This is also where the 49 CFR Part 387 minimum financial responsibility rules bite. No motor carrier shall operate a motor vehicle until the motor carrier has obtained and has in effect the minimum levels of financial responsibility as set forth in § 387.9 of this subpart. Each MC must have its own filing. A single policy can sometimes be endorsed to cover multiple named insureds, but that takes deliberate structuring — not a default.

The carrier-plus-broker setup and where coverage falls apart

A carrier MC and a broker MC don’t even need the same kind of insurance. The carrier MC needs auto liability, usually $1M combined single limit minimum under 49 CFR 387.9, plus cargo, plus physical damage on the trucks. The broker MC needs a $75,000 BMC-84 surety bond or BMC-85 trust fund agreement, plus contingent cargo and broker errors and omissions coverage that most generalist agents forget to write.

The exposure when these sit under the same roof: contingent cargo liability.

When your broker MC arranges a load and the carrier you booked it with damages or loses the freight, the shipper looks at the broker first. If your broker E&O policy is missing or under-limit, your trucking auto policy will not cover that loss — it’s not your truck and not your driver. Brucks face secondary risk if they fail to vet carriers properly, but they do not assume direct cargo liability as carriers do. Brokers can still get sued. They get sued often.

The cleanest fix is a contingent cargo policy and broker E&O written specifically for the broker MC, with limits that reflect the average load value you’re moving through brokered freight. Not the truckload limit on your carrier policy. A separate program.

I’ve seen brokered load claims wipe out small fleets that ran broker operations on the side without proper coverage. Five-figure cargo loss turns into a six-figure legal bill because nobody filed an answer in time.

Two carrier authorities under one ownership group — the hidden exposure

This one’s quieter but more common than people realize. A fleet operates two MC numbers for two carrier operations — say dry van under MC A and flatbed under MC B. Common ownership, separate authorities, sometimes shared equipment or drivers across both.

The exposures:

• Wrong-MC dispatch. A driver gets dispatched under MC A but the load is technically booked under MC B’s authority. The insurance certificate on file with the shipper is MC A’s. If there’s a claim, the wrong policy gets billed, and the shipper may have a claim against MC B with no certificate to back it up.
• Equipment crossover. A truck titled to MC A’s entity gets used for an MC B load. The MCS-90 filing for MC B doesn’t apply because that truck isn’t listed on MC B’s policy.
• Shared driver records. A driver’s qualification file lives under one MC. If FMCSA audits the other MC and the driver was operating under it, the missing DQ file is a violation against the unaudited MC. FMCSA will inactivate USDOT Numbers upon discovery that the number is being used by anyone other than the assigned legal person.

The fix is operational and insurance-side at the same time. Each MC needs its own driver roster, its own equipment list, its own insurance filings, and a clear internal rule on which authority gets dispatched under which contract. The insurance side has to mirror the operational side. If you blur it, claims will too.

Insurance filings, BMC-91 vs BMC-84, and what FMCSA actually sees

FMCSA tracks each MC number’s insurance through filings made directly by your insurance company. The big ones:

• BMC-91 or BMC-91X — auto liability proof of financial responsibility for motor carriers of property and passengers
• BMC-34 or BMC-83 — cargo liability proof, where required
• BMC-84 or BMC-85 — broker surety bond or trust fund agreement, $75,000 minimum
• MCS-90 — endorsement attached to your liability policy that guarantees payment up to the federal minimum even if the policy would otherwise exclude coverage

FMCSA will not grant operating authority registration until the registrant has in effect the minimum levels of financial responsibility on file with FMCSA, and once operating authority is granted, entities are required to maintain proof of insurance and designation of agents for process on file with FMCSA to avoid revocation proceedings.

What this means for a multi-authority fleet: every MC needs its own filings. The carrier MC needs a BMC-91, an MCS-90, and possibly a BMC-34. The broker MC needs a BMC-84 or BMC-85. None of these cross over. Filing the BMC-91 on your carrier MC does nothing for your broker MC’s compliance.

If FMCSA sees a lapse on any of these for any of your authorities, you get a revocation proceeding notice. The authority that lapsed gets revoked. The others keep running — but the lapsed one cannot legally operate until the filing is restored.

This is the part where I see good operations get tripped up. The renewal on the main carrier MC goes smoothly. The broker MC, which the bookkeeper barely thinks about, lapses because nobody confirmed the surety bond was renewed. Three months later, an FMCSA notice arrives. The whole brokerage side of the operation is in revocation.

How fleets get caught — three scenarios that turn into claims

Scenario 1: A small fleet runs a carrier MC for its 12 trucks and a broker MC for overflow freight. A brokered load — high-value electronics — is lost in transit. The shipper sues the broker entity for $180,000. The fleet has no contingent cargo and no broker E&O. The auto liability policy on the carrier MC doesn’t apply because no fleet-owned truck was involved. The fleet pays out of pocket and settles for $95,000 plus legal fees.

Scenario 2: A fleet operates dry van under MC A and flatbed under MC B, same ownership. A flatbed driver causes a serious injury accident. The shipper’s contract was signed under MC A’s name because that’s the entity the customer remembered. The certificate of insurance on file with the shipper is MC A’s. Plaintiff’s counsel names both entities and both policies. Coverage disputes between the two policies eat up six months of defense time and create a coverage gap the plaintiff exploits in mediation.

Scenario 3: A fleet acquires a small carrier and keeps the acquired MC active because some customers know the old name. The acquired MC’s insurance filings lapse 90 days after the deal closes — the renewal notice went to the old owner’s email. FMCSA revokes the acquired MC. A load is mid-transit when the revocation hits. The shipper finds out, refuses to pay the freight bill, and files a claim for delay damages.

None of these are hypothetical. They are versions of claims I have walked clients through.

Building a coverage program that fits a multi-authority operation

What a properly built program looks like for a multi-MC fleet:

• Separate auto liability for each carrier MC — or a single policy with each entity named as an insured and each MC’s filings made under its own number. Talk to an agent who has actually written multi-MC programs. Many haven’t.
• A dedicated broker policy for any broker authority — including contingent cargo, broker E&O, and the BMC-84 or BMC-85 filing
• Workers compensation reviewed at the entity level — if drivers cross between MCs, the comp policy needs to name both entities or you’ll have a denied claim
• Physical damage scheduled correctly — every unit listed under the right MC, with VINs matching titles
• A renewal calendar that tracks each MC’s filings separately — not one renewal date for the whole operation
• An internal dispatch rule — clear written policy on which MC books which type of load and how that gets documented on the rate confirmation and BOL

The biggest mistake I see is fleets treating the second MC like an afterthought. It isn’t. From a liability perspective, it’s a second business with its own insurance program. Treat it that way and the coverage actually works when you need it.

Questions to ask your broker before your next renewal

Run these by whoever writes your insurance. If they can’t answer all of them in clear English, that’s a sign:

1. Which MC numbers are listed on my auto liability policy as named insureds?
2. Which MCs have current BMC-91, BMC-34, or BMC-84 filings on file with FMCSA, and what are the next renewal dates for each?
3. If a claim hits the broker MC, what policy responds — and what are the limits?
4. If a driver dispatched under MC A causes an accident on a load booked under MC B, who pays?
5. Do my certificates of insurance accurately reflect each MC’s coverage when issued to different shippers?
6. What contingent cargo and broker E&O limits do I carry, and how were they sized?
7. If we acquired an MC in the last 24 months, what happens to coverage on that authority if it has a loss?

If you’re running multiple MC numbers and any of the above made you pause, your coverage program needs a second look before your next renewal. Our team works with fleets across the country to structure coverage that actually fits how the operation runs — including multi-authority setups, broker-plus-carrier hybrids, and acquired-authority situations. Get a coverage review at Valley Trucking Insurance and we’ll walk through each MC, each filing, and each exposure with you before there’s a claim to deal with.

Frequently Asked Questions

Can one insurance policy cover two MC numbers?
Sometimes, but only when the policy is deliberately structured to name each entity as a named insured and each MC has its own FMCSA filings made under its own number. A standard single-entity policy does not automatically cover a second MC, even if both are owned by the same person.

Do I need separate insurance for a carrier MC and a broker MC?
Yes. A carrier MC needs auto liability, cargo, and physical damage coverage. A broker MC needs a $75,000 BMC-84 surety bond or BMC-85 trust fund agreement, plus contingent cargo and broker errors and omissions coverage. The two sets of coverage protect against completely different risks.

What happens if one of my MC numbers has an insurance lapse?
FMCSA will issue a revocation proceeding notice for that specific MC. The authority that lapsed cannot legally operate until the filing is restored. Your other MCs remain active as long as their filings are in good standing.

Can FMCSA shut down my whole operation if one MC has a problem?
Generally no — each MC is treated as a separate regulated entity. However, a serious compliance issue tied to common ownership (like sharing equipment improperly or using the wrong MC for dispatch) can trigger investigations across multiple authorities.

Why would a fleet want more than one MC number?
The most common reasons are running a brokerage alongside the carrier operation, separating risk between divisions (like flatbed vs dry van), keeping an acquired company’s name and authority active for customer continuity, or operating under distinct business entities for tax or liability reasons.

Does the MCS-90 endorsement transfer between MC numbers?
No. The MCS-90 is filed under one specific MC and applies only to that authority. Each MC that needs financial responsibility filings under 49 CFR 387 needs its own MCS-90 attached to its own auto liability policy.

Can I share a workers compensation policy across two MC numbers with the same owner?
Usually yes, but only if the policy lists both legal entities as named insureds. If drivers regularly cross between MCs and the comp policy only names one entity, a workers comp claim under the unnamed entity can be denied.

How do I find out exactly which insurance filings are on each of my MC numbers?
Use the FMCSA Licensing and Insurance system at Dotli-public.fmcsa.dot.gov, search by your MC number, and review the active filings displayed for each authority. A good agent will pull this for every MC at every renewal.