Buying the insurance is only half of getting legal. For a for-hire carrier, the policy has to be filed with the government before your operating authority turns on, and that filing is a separate step your insurer does on your behalf. This is where new operators get stuck: the coverage is bound, but the authority still says pending, because the filing has not posted. Here is what each form is, who needs it, and how it fits together, in plain English.
BMC-91 and BMC-91X: your proof of liability
The BMC-91X is the electronic filing your insurer sends to FMCSA proving you carry the required public liability insurance (bodily injury and property damage). It is what flips your operating authority from pending to active. The BMC-91 is the older, paper-form version of the same thing; today almost every carrier is filed on the 91X because insurers submit it electronically.
Two things to understand:
- You do not file it, your insurer does. When we bind your liability policy, we transmit the 91X to FMCSA under your USDOT/MC number. That is why "who is your agent" and "how fast can they file" actually matter when you are trying to activate authority on a deadline.
- If it cancels, FMCSA knows. A BMC-91X cancellation is reported to FMCSA, and an authority without an active liability filing gets revoked. This is the single most common reason authority "flickers" (active, revoked, reinstated), it is almost always a lapsed or cancelled filing behind it. You can watch your own filing status on our DOT lookup.
The required amount is the $750,000 federal minimum for general freight (higher for hazmat), but the market runs on $1,000,000, so that is what the filing shows. For why that gap exists, see primary liability explained like a human.
BMC-34: cargo filing (movers only)
The BMC-34 is the federal cargo insurance filing, and here is the part that saves people money: it is only required for household goods (HHG) movers. If you haul general freight, you do not need a federal cargo filing, even though your brokers will still require a $100,000 cargo policy contractually. So carry the cargo coverage the load boards demand, but do not let anyone tell a general-freight carrier they need a BMC-34.
MCS-90: the endorsement that protects the public, not you
The MCS-90 is not a policy and not a filing you send in, it is an endorsement attached to your auto liability policy. It is a federal safety net: it guarantees that your insurer will pay a member of the public for bodily injury or property damage up to the federal minimum, even if the loss would otherwise be excluded from your policy (say, you were running a use the policy did not cover).
The catch that surprises owner-operators: the MCS-90 protects the injured public, not you. If the insurer pays a claim under the MCS-90 that your policy would not have covered, they can come back and collect that money from you. So it is not a reason to skimp on real coverage, it is a backstop for the public, and a reason to make sure your actual policy matches how you actually run.
Get your filings handled with your policy
Form E and Form F: the state-level versions
The BMC-91X covers interstate authority. Many states run their own intrastate filing system, and the common forms are:
- Form E: the state proof-of-insurance filing, the intrastate cousin of the BMC-91X. If you operate for hire within a single state that requires it, your insurer files a Form E for your state authority.
- Form F: the cancellation notice for a Form E.
- Form H: a cargo filing some states require.
Whether you need a Form E depends entirely on the state you run in and whether you are inter or intrastate. This is exactly the kind of thing an agent should just know for your state instead of leaving you to guess.
BMC-84 and BMC-85: broker bonds (not carriers)
If you are getting a broker authority rather than a carrier authority, you are in a different filing entirely: the BMC-84 (a $75,000 surety bond) or BMC-85 (a trust fund). Carriers who haul freight do not need these. We mention it only because "BMC" filings get lumped together and confused, brokering and hauling are separate authorities with separate requirements.
Where MCS-150 fits
The MCS-150 is not an insurance filing at all, it is your registration update, the form that creates and biennially refreshes your USDOT record. It has to be current or your authority can be deactivated, but it is separate from the insurance filings above. We break it down in filing your MCS-150.
The short version
- BMC-91X = proof of liability, filed by your insurer, activates your interstate authority.
- BMC-34 = cargo filing, movers only.
- MCS-90 = endorsement on your liability policy that protects the public (and that the insurer can bill back to you).
- Form E = the state/intrastate version of the liability filing.
- BMC-84/85 = broker bonds, not for carriers.
- MCS-150 = your registration, not insurance.
How McClure helps
Getting authority live is a race between your coverage being bound and the filing posting, and a slow or sloppy filing costs you loads. We bind the policy and transmit the BMC-91X (and Form E where your state needs it) the same day, confirm it posts, and keep it active so your authority never flickers. If you are setting up a new operation, our new-authority insurance requirements guide walks the whole sequence. Tell us your DOT/MC and we will handle the filing side start to finish.