BMC-91 vs BMC-91X: Why the Filing Type Tells You More Than the Dollar Limit

The carrier had $1,000,000 in liability on file. I could see it on FMCSA's L&I system. The filing was active. The load moved.

Six months later, the insurer on that filing was in liquidation proceedings in two states — surplus lines, B-rated, no state guaranty fund backstop. The claimant's attorney filed suit. The broker on that load isn't me, but she called me after her deposition. "They asked if I'd checked the insurer — not just the limit," she said. "I didn't even know there was a difference."

There is.

What BMC-91 and BMC-91X Actually Are

Under 49 CFR Part 387, every motor carrier operating in interstate commerce has to maintain minimum financial responsibility. The floor is $750,000 for general freight, $1,000,000 for many hazardous materials loads in quantities requiring placarding. To prove they've met it, the carrier or their insurer files a form with FMCSA.

BMC-91 is that form when an admitted insurer is filing it. BMC-91X is the same form when a surplus lines (non-admitted) insurer is filing it.

One form. Two versions. They look identical in FMCSA's system. They mean very different things when a claim goes sideways.

Admitted vs Non-Admitted: The Backstop Nobody Explains

An admitted insurer is licensed by the state insurance commissioner in every state where it writes business. That licensing comes with a guaranty fund backstop: if an admitted insurer goes insolvent, most states' insurance guaranty associations will cover claims up to a statutory cap — typically $300,000 to $500,000 per claim, varying by state. It's not unlimited protection, but it exists.

A surplus lines insurer is placed through a licensed surplus lines broker and doesn't carry that guaranty fund protection in most states. The coverage can be completely legitimate — Lloyd's of London operates on a non-admitted basis in most U.S. states, and nobody questions whether Lloyd's pays. But when a smaller, lower-rated surplus lines carrier goes into liquidation, claimants and everyone else in the liability chain file as general unsecured creditors. The state doesn't step in.

The difference is invisible at tender time. It's very visible at claim time.

Finding It on FMCSA

When you pull a carrier snapshot at safer.fmcsa.dot.gov — the raw company snapshot, not a third-party vetting tool, not QCMobile — the active insurance filing shows you the form type (BMC-91 or BMC-91X), the insurer name, the filing date, and the status. Most brokers look at the coverage limit and stop reading. The insurer name is the signal.

A carrier I was vetting in March — MC-1247893 / DOT-3567102, a 14-truck reefer operation out of Laredo with 26 months of authority — showed a BMC-91X with an insurer I didn't recognize. NAIC lookup returned the entity. AM Best returned a C++ rating. I asked the carrier to provide full policy declarations and confirm whether the insurer was admitted in Texas. They couldn't answer it clearly. I passed on the load and documented the reason in my TMS.

Two weeks later, that insurer appeared in an NAIC regulatory bulletin showing a market conduct action filed by two state commissioners.

I can't tell you that sequence repeats itself on schedule. What I can tell you is that a C++ AM Best rating on a BMC-91X is a flare, and most brokers never look for it because they don't know it's there.

The AM Best Check

When I see a BMC-91X, I run the insurer name through the NAIC company search to get the legal entity, the NAIC number, and the states where it's licensed. Then I check AM Best for the financial strength rating.

My own thresholds, for what it's worth:

A- or above: Proceed normally.

B++ or B+: Note it. Proceed cautiously on loads over $150K. I increase cargo documentation requirements and verify the carrier's cargo policy separately.

B or below: I have a hard conversation with the shipper about requiring the shipper's own cargo policy or a named insured endorsement on the carrier's policy before the load moves.

These aren't regulatory requirements. There's nothing in Part 387 that says a broker has to check an insurer's AM Best rating. But post-Montgomery, the question "did you know this insurer was financially distressed when you tendered?" is exactly what a plaintiff's attorney asks in deposition. Having a documented "yes, I checked, here's what I saw, here's what I did about it" is a materially better position than "I only looked at the limit."

Where the MCS-90 Fits In

I get this question every time: "What about the MCS-90 endorsement? Doesn't that guarantee the policy pays?"

Sort of. The MCS-90 endorsement — required under § 387.15 and physically attached to the liability policy — obligates the insurer to pay covered public liability claims up to the statutory minimum even if the policy would otherwise deny. It prevents the insurer from hiding behind load exclusions or driver eligibility arguments to escape a third-party injury or property damage claim.

What it doesn't do: protect against insurer insolvency. An endorsement on a policy written by a carrier in liquidation is worth whatever you can recover from the liquidation estate.

And it doesn't cover cargo. The MCS-90 is for public liability — bodily injury and property damage to third parties in an accident. If the dispute is cargo damage (a refrigerated load that arrived warm, electronics that were stolen, freight that arrived wet), you're dealing with the carrier's cargo policy. That's a separate instrument, separate insurer, no MCS-90 requirement, no BMC-91 or BMC-91X filing required by federal law.

This is one of the most consistent confusions I see. A broker confirms "$1M liability on file" and thinks the freight is protected. The liability policy doesn't cover the freight. They're two separate insurance products with separate premiums, separate underwriters, and separate claims processes. One of them has a federal floor and a required federal filing. The other one doesn't.

The Insolvency Problem Nobody Talks About

Walk through the scenario: a 30-truck flatbed carrier, MC-983421 / DOT-4421867, gets into a serious accident in February. The claimant files a $1.8M injury suit. The carrier's limits are $750,000 — the statutory floor for general freight under § 387.9(d). The insurer is surplus lines, rated B by AM Best.

Litigation takes 20 months. At month 16, the insurer files for receivership in its home state. The $750,000 policy is now a claim in the insolvency proceeding. The state guaranty fund won't cover it — non-admitted. The claimant's attorneys know who else is in the supply chain.

After Montgomery v. Caribe Transport II, LLC, you're in that lawsuit as the broker. The unanimous Supreme Court holding makes clear that the FAAAA doesn't preempt state-law negligent-selection claims. Your diligence file gets produced. Your vetting checklist gets admitted. The deposition question is: did you check the insurer, or did you just check that the filing existed?

That sequence isn't hypothetical anymore.

How I Document This

For every carrier I vet on a load over $150K:

1. Screenshot of the active L&I filing from safer.fmcsa.dot.gov — form type (BMC-91 or 91X), insurer name, filing date. Timestamp on the screenshot.

2. NAIC entity lookup — insurer legal name, NAIC number, licensing status in the state(s) of operation, saved as a PDF.

3. AM Best rating screenshot. If the rating is B+ or below, a note in my TMS carrier card explaining the risk factor and what additional step I took — lower load cap, shipper cargo policy requirement, named insured endorsement, whatever I landed on.

4. On loads over $500K where the filing is a BMC-91X and the AM Best rating is below A: I require documentation before the load moves. Either a certificate showing the shipper's own cargo policy endorsed to cover the move, or a named insured endorsement on the carrier's cargo policy. I keep that documentation in the load file.

5. In my TMS carrier card comment: "Liability: [Insurer Name], [BMC-91 or BMC-91X], AM Best [Rating], checked [Date]."

That's six fields and less than ten minutes per carrier. If I'm ever deposed about whether I vetted the insurer, the paper trail shows I did — and shows what I saw when I did it.

The Check Most Brokers Skip

Before May 14, a lot of brokers operated with a checkbox mentality: does the FMCSA record show an active filing? Check. Good to go. The preemption argument gave some cover in certain circuits.

That argument is gone. Montgomery is unanimous and national. A broker can be sued in state court for negligent carrier selection and the FAAAA won't preempt the claim. "I confirmed the filing existed" doesn't hold up if the filing was backed by a C++ insurer that was in regulatory trouble when you tendered.

The five-minute AM Best check isn't a burden. It's the difference between knowing what you tendered against and not knowing — and that difference now shows up in court.

Most brokers don't do this check. They should.

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— Mason Lavallet

Founder, DOTScreener.com