The short answer
The BMC-91 and BMC-91X are the forms your insurer files with FMCSA to prove you carry the required public liability insurance. The BMC-91 is used when a single insurer provides the full required limit; the BMC-91X is used when coverage involves more than one insurer or certain other arrangements, and many insurers use it by default. You don't file it yourself, your insurer does, and your authority can't go active without it.
If you're getting your own authority, you'll hear "BMC-91X" a lot. It's not a coverage; it's proof of coverage. This guide explains what the BMC-91 and BMC-91X are, who files them, how long they take and what happens when a policy cancels.
What the BMC-91 and BMC-91X certify
Federal law requires for-hire motor carriers to maintain minimum levels of financial responsibility for bodily injury, property damage and environmental restoration (49 CFR Part 387). The BMC-91 or BMC-91X is the insurer's certification to FMCSA that your policy meets that requirement and includes the MCS-90 endorsement.
| Form | Used when | Filed by |
|---|---|---|
| BMC-91 | One insurer provides the full required limit | Your insurer |
| BMC-91X | More than one insurer is involved, or the insurer uses this form for its filings | Your insurer |
| BMC-34 | Cargo liability for household goods carriers | Your insurer |
| BMC-35 | Notice of cancellation of a BMC-91/91X filing | Your insurer |
In practice, many insurers file the BMC-91X even for single-insurer policies. From your side, what matters is that a valid filing shows as active on FMCSA's Licensing and Insurance system.
Who files it, and how
You can't file a BMC-91X yourself. Your insurance company files it electronically with FMCSA after you bind coverage. Ask your agent to request the filing the same day you bind, and ask for confirmation once it's submitted.
How long it takes
Electronic filings usually post within a few business days, though timing can vary. Check FMCSA's Licensing and Insurance (L&I) system using your docket (MC) number to confirm the filing appears. If it doesn't show after a reasonable time, call your agent.
How it fits into getting your authority
From application to your first load
The order filings usually happen in
- Step 1Get a USDOT number and apply for MC authority (FMCSA registration)
- Step 2FMCSA publishes the application; a protest period follows
- Step 3Insurer files BMC-91X; process agent files BOC-3
- Step 4Authority goes active once filings are on record
- Step 5UCR, IFTA and IRP as needed; book loads
For new carriers, FMCSA generally requires the insurance filing and the BOC-3 to be on record within 90 days of your application's publication. Your authority becomes active only once both are on file and the protest period has passed. Full timeline: new authority truck insurance.
What limits does the filing show?
The filing shows your liability limit, which must be at or above the federal minimum for what you haul:
Federal minimum liability for for-hire carriers
Interstate carriers of property, vehicles of 10,001 lbs GVWR or more
Brokers usually require more than the federal minimum, most commonly $1,000,000. See our guide to FMCSA insurance requirements.
What happens if your policy cancels
If your policy is canceled, your insurer files a BMC-35 notice of cancellation with FMCSA. Federal rules provide for advance notice (generally 30 days) before the cancellation takes effect. If no replacement filing is received before then, FMCSA will begin the process of revoking your authority. That's why, when you change insurers, you should bind the new policy and have its BMC-91X filed before the old one cancels. Our article on switching truck insurance mid-term walks through the steps.
Common BMC-91X problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Filing doesn't appear | Not requested, or wrong docket number | Ask your agent to confirm the MC number and resubmit |
| Authority still inactive | BOC-3 missing or protest period not over | Check the BOC-3 and the date your application was published |
| Revocation notice received | Cancellation filed with no replacement | Bind coverage and have the new insurer file immediately |
| Wrong limit showing | Filing error or policy endorsement | Ask your insurer to correct the filing |
BMC-91X vs. certificate of insurance
They're different documents. The BMC-91X goes to FMCSA. A certificate of insurance (COI) goes to brokers, shippers and lessors to show your coverages and limits. You'll need both, and you'll update COIs whenever your policy changes.
Questions truckers ask
What is a BMC-91X?
It's the form your insurer files with FMCSA to certify that you carry the required public liability insurance for your operating authority.
What's the difference between BMC-91 and BMC-91X?
The BMC-91 is used when one insurer provides the full required limit. The BMC-91X is used when more than one insurer is involved or when the insurer uses it for its filings; many insurers use it by default.
Can I file a BMC-91X myself?
No. Your insurance company files it electronically with FMCSA after you bind coverage.
How do I check if my BMC-91X is filed?
Search your docket number in FMCSA's Licensing and Insurance system. The active filing and insurer should appear.
What happens if my insurance cancels?
Your insurer files a BMC-35 cancellation notice. If no replacement filing is received before it takes effect, FMCSA begins revoking your authority.
Written by the FairlyCover Editorial Team. This guide explains how coverage generally works. It isn't legal or insurance advice, and your policy wording always decides what's covered. How we write and review content.
