TL;DR: The MCS-90 is an endorsement your insurer attaches to your liability policy. It promises that any final judgment from FMCSA-regulated operations gets paid, up to the required limit, even if the policy would exclude the claim. Almost every for-hire interstate carrier needs one, and the insurer can bill you back for what it pays.
What does the MCS-90 endorsement actually do?
The MCS-90 is a federal endorsement attached to your commercial auto liability policy. Its full name is the Endorsement for Motor Carrier Policies of Insurance for Public Liability Under Sections 29 and 30 of the Motor Carrier Act of 1980. Under 49 CFR 387.7, a motor carrier cannot operate until it has the minimum financial responsibility in place, and the MCS-90 is the standard proof.
Here is the plain-English version. The endorsement is a promise from your insurer to the public, not to you. If someone wins a final court judgment against you for injury, death, or property damage caused by your trucking operations, the insurer must pay it up to the required limit. That is true even if the truck involved was not listed on the policy, or the claim would normally be excluded.
Why is the MCS-90 not the same as coverage?
This is the part that surprises carriers. The MCS-90 does not add coverage for you. It guarantees payment to an injured member of the public, then lets the insurer come back to you for the money. The endorsement contains a reimbursement clause: you agree to repay the insurer for any amount it pays that it would not have owed under the policy itself.
Picture a truck you bought last month but never added to the policy. It causes a serious crash. The policy itself would deny the claim because the truck is not scheduled. The MCS-90 forces the insurer to pay the judgment anyway. Then the insurer can bill you for every dollar. The public is protected. You are not.
The lesson: treat the MCS-90 as a safety net for other people, and keep your actual policy accurate. Schedule every truck, every driver, and every state you run.
Who is required to carry an MCS-90?
In general, for-hire motor carriers operating in interstate commerce with vehicles rated 10,001 pounds or more need the endorsement, and private and for-hire carriers hauling hazardous materials need it at higher limits. The limits come from 49 CFR 387.9, which has set the floor for general freight at $750,000 since January 1, 1985.
| Operation | Minimum limit under 49 CFR 387.9 |
|---|---|
| For-hire, non-hazardous freight, vehicles 10,001 lbs or more | $750,000 |
| Oil and most listed hazardous materials | $1,000,000 |
| Bulk high-hazard materials, such as explosives and certain gases | $5,000,000 |
Most shippers and brokers require $1,000,000 in liability regardless of the federal floor, so in practice nearly all carriers buy at least that much.
Where does the MCS-90 live, and what gets filed with FMCSA?
People mix up two different things. The MCS-90 endorsement is kept at your principal place of business with your policy. It is not filed with FMCSA. What FMCSA receives is a separate electronic filing from your insurer, usually a Form BMC-91 or BMC-91X certificate, which tells the agency your coverage exists. Under 49 CFR 387.15, the endorsement must show your company name exactly as it appears on your operating authority.
What happens when an MCS-90 policy is cancelled?
Coverage under the endorsement runs continuously until it is properly terminated. Under 49 CFR 387.7(b), either you or the insurer can cancel with 35 days written notice to the other. Your insurer also has to tell FMCSA before your federal filing dies, and a filing that lapses puts your authority on the path to revocation. If you are switching insurers, have the new filing in place before the old one ends so there is no gap.
How do I get an MCS-90 endorsement?
You do not buy it separately. When you tell your agent you run interstate for-hire trucking, the insurer issues the endorsement with your liability policy and makes the federal filing for you. What you should check: the name on the endorsement matches your authority exactly, the limit matches your commodity under 49 CFR 387.9, and the BMC filing shows active in FMCSA's Licensing and Insurance system.
Real questions owner-operators and fleet managers ask
Does the MCS-90 cover my truck if it is not on the policy?
It pays the public, not you. If an unlisted truck causes a judgment, the insurer must pay up to the required limit, but the reimbursement clause lets the insurer recover that money from you. Keep every truck scheduled on the policy so real coverage applies.
Is the MCS-90 filed with FMCSA?
No. The endorsement stays with your policy at your principal place of business. Your insurer separately files a certificate, usually Form BMC-91 or BMC-91X, with FMCSA electronically. That filing is what keeps your operating authority active.
Do intrastate-only carriers need an MCS-90?
Usually not for non-hazardous freight, because the endorsement applies to FMCSA-regulated interstate operations. Hazardous materials change the answer, since 49 CFR 387.9 reaches certain intrastate hazmat hauling. Confirm with FMCSA and your state rules before skipping it.
What limit does my MCS-90 need?
Match it to your commodity under 49 CFR 387.9: $750,000 for for-hire general freight at 10,001 pounds or more, $1,000,000 for oil and most listed hazmat, and $5,000,000 for bulk high-hazard loads. Most shippers require $1,000,000 even when the law allows less.
Can my insurer really make me pay back an MCS-90 claim?
Yes. The endorsement gives the insurer a written right to reimbursement for any payment it made only because of the MCS-90. That debt can follow your business, which is why accurate scheduling of trucks and drivers matters more than the endorsement itself.
Why truckers work with Morrow
- We know the filings. Morrow places liability policies with the MCS-90 endorsement and confirms your federal filings are active before you dispatch.
- New authority is our normal. First-year carriers pay the most and get declined the most. We work with markets that actually want new ventures and we tell you what the first renewal takes.
- Certificates and filings, fast. Certificates of insurance the same business day for most carriers, and federal or state filings submitted electronically so your authority is not sitting in a queue.
- We quote the whole picture. Liability, cargo, physical damage, and the endorsements shippers and brokers actually check for, priced together so nothing is missing when a load is on the line.
- Real people when something goes wrong. A claim, a lapse notice, or a lost certificate gets a person, not a portal.
Related trucking guides
Short answers to the surrounding questions truckers ask next.
- Trucking insurance at Morrow (start here)
- BMC-91 and BMC-91X filings, explained
- Federal minimum liability limits by commodity
- Insurance you need to get an MC number
- Primary auto liability for truckers
- What happens if trucking insurance lapses
- Commercial auto for trucking fleets
This guide is general information, not legal, tax, or insurance advice. Limits, forms, and deadlines change, so verify current requirements with FMCSA before you rely on them. Morrow is a brand name of Afthonea Inc. Last updated: July 2026.