Federal rules require for-hire interstate truckers, and carriers of oil and hazardous materials, to carry minimum liability limits and keep proof of it. The MCS-90 is that proof: an endorsement in a form FMCSA prescribes that keeps the insurer responsible for public liability judgments regardless of policy conditions, unlisted trucks or the carrier’s bankruptcy. If the insurer pays something the policy didn’t otherwise cover, the carrier has agreed to pay it back. It does not cover the carrier’s own truck, the cargo, or the carrier’s own employees.
What the MCS-90 promises
The endorsement amends an auto liability policy so the carrier complies with the federal financial responsibility rules in 49 CFR Part 387. The insurer agrees to pay, within the limit shown, any final judgment against the insured for public liability, meaning bodily injury, property damage or environmental restoration, resulting from negligent operation, maintenance or use of vehicles subject to those rules.
Two phrases do most of the work. The promise applies whether or not each vehicle is specifically described in the policy, and whether or not the accident happens on a route or in a territory the carrier is authorized to serve. And no condition, provision or limitation in the policy, and no violation of one, relieves the insurer of paying that judgment, whatever the carrier’s financial condition, insolvency or bankruptcy.
The limit applies separately to each accident, so a payment on one accident doesn’t reduce what is available for another. If the insurer fails to pay a final judgment, the person holding it can sue the insurer directly.
Why it isn’t coverage for the trucking company
The MCS-90 works more like a guarantee for the public than insurance for the carrier. All the policy’s own terms still apply between the carrier and the insurer, and the carrier agrees to reimburse the insurer for any payment it would not have been obligated to make except for the endorsement. Even the schedule of limits printed on the form carries a note that it does not provide coverage.
In practice, a truck left off the policy, or a use the policy excludes, can still lead to a payment to an injured person, followed by a reimbursement demand to you. The endorsement keeps the public whole; it does not close a gap in your own policy.
It also leaves out two things entirely: injury to or death of the carrier’s own employees on the job, and property the carrier is hauling as cargo. Those need cargo coverage and an injury plan for your people.
Who needs an MCS-90?
- For-hire carriers of general freight operating vehicles with a gross vehicle weight rating of 10,001 pounds or more in interstate or foreign commerce, at a federal minimum of $750,000.
- Carriers of oil, hazardous materials, hazardous waste or hazardous substances, for-hire and private, at $1,000,000 or $5,000,000 depending on the material and how it’s carried. Parts of this rule reach intrastate hauling too.
- Not covered by the rule: vehicles under 10,001 pounds GVWR, unless they carry certain explosives, poison inhalation hazard materials or highway route controlled quantities of radioactive material in interstate or foreign commerce.
For-hire carriers whose fleet is made up only of vehicles under 10,001 pounds still have a $300,000 liability filing requirement to hold operating authority, but that falls under a different part of the rules and uses a different endorsement form.
MCS-90 vs. the BMC-91X filing
These get mixed up because both come from the insurer and both concern the same liability policy. The MCS-90 is the endorsement attached to the policy. A U.S. carrier keeps that proof at its principal place of business, it is public information, and it must be produced on reasonable request by a member of the public. Carriers domiciled in Canada or Mexico must also carry a legible English copy in each vehicle operating in the United States.
The BMC-91 or BMC-91X is a certificate the insurer files with FMCSA so the agency can grant, and keep active, a for-hire carrier’s operating authority. When the coverage behind that filing is also required under the DOT minimums, the MCS-90 goes on the policy as well. One proves the coverage to the public, the other proves it to FMCSA. Where the filing fits in getting MC authority.
Cancellation and changing insurers
Coverage under the endorsement stays in effect continuously until it is cancelled. Either the insurer or the carrier can cancel by giving the other 35 days’ written notice, and when the carrier is subject to FMCSA registration, 30 days’ notice to FMCSA is also required, counted from when FMCSA receives it.
When a carrier replaces one policy with another, the old insurer’s responsibility for later accidents ends when the replacement takes effect or when the 35-day notice period runs out, whichever comes first. Commercial trucking.
Common questions
Does the MCS-90 cover damage to my own truck?
No. It applies only to public liability: injury, property damage and environmental restoration caused to others. Damage to your own equipment needs physical damage coverage.
Does the MCS-90 cover cargo?
No. The endorsement expressly does not apply to property the carrier transports as cargo. Freight losses are handled by a motor truck cargo policy.
Do I have to keep the MCS-90 in the truck?
U.S. carriers must keep proof at their principal place of business. Carriers domiciled in Canada or Mexico must carry a legible English copy in each vehicle operating in the United States.
If my insurer pays under the MCS-90, do I owe it money?
Possibly. If the insurer pays a judgment it would not have owed under the policy itself, for example because the truck wasn’t listed or a policy condition was broken, you have agreed to reimburse it.
Is an MCS-90 issued for each truck?
No. FMCSA explains that it is attached to the carrier’s liability policy and applies to all vehicles operated under that policy that are subject to the federal financial responsibility requirements.
Sources
- 49 CFR Part 387, Subpart A (eCFR): applicability, Form MCS-90, minimum levels
- FMCSA: Form MCS-90 endorsement
- 49 CFR Part 387, Subpart C (eCFR): insurance filings, BMC-91/91X, minimum limits
General information about the federal MCS-90 endorsement as of October 2026, not legal or tax advice; the endorsement’s wording and 49 CFR Part 387 control. Coverage depends on underwriting and the terms, conditions and exclusions of the policy actually issued.