Compliance · Auto Liability
MCS-90 Endorsement Explained: What It Covers, What It Doesn’t, and Why It Matters
By Brett Dykes · 9 min read
If you haul freight across state lines under your own authority, the MCS-90 endorsement is attached to your auto liability policy whether you’ve noticed it or not. Most truckers first hear about it when a broker asks for it, an underwriter mentions it, or a claim lands on a truck that was never on the policy.
It’s also one of the most misunderstood forms in trucking insurance. Some carriers think it’s extra coverage. Others think it’s the same thing as their FMCSA filing. Neither is quite right, and the difference can cost real money after an accident. Here’s what the MCS-90 actually does, in plain terms.
Key Takeaways
- ✓It’s a federal endorsement on your auto liability policy, required under 49 CFR Part 387 for carriers running interstate. Intrastate-only carriers hauling non-hazardous freight don’t need one.
- ✓It protects the public, not you. It guarantees injured third parties get paid up to the federal minimum.
- ✓It can apply even to a truck that isn’t listed on your policy, but you agree to pay the insurance company back.
- ✓It does not cover cargo, your own employees, or damage to your own truck.
- ✓It isn’t your federal filing, and an active filing doesn’t always mean coverage is in place.
What is the MCS-90 endorsement?
The MCS-90 is a standard federal form titled “Endorsement for Motor Carrier Policies of Insurance for Public Liability.” It comes from the Motor Carrier Act of 1980 and is required by 49 CFR §387.15. If you operate interstate, your insurance company attaches it to your commercial auto liability policy.
According to FMCSA, the endorsement isn’t issued truck by truck. It attaches to the policy and applies to every vehicle you operate that falls under the federal financial responsibility rules. The regulation also requires it to be issued in the exact name of the motor carrier, so the name on your policy should match your legal name with FMCSA.
The short version
The MCS-90 is a promise to the public. If your truck injures someone or damages their property, the insurance company guarantees a judgment gets paid up to the federal minimum, even if your policy has a gap.
Who needs an MCS-90, and at what limit?
Federal financial responsibility rules apply mainly to for-hire carriers hauling property in interstate commerce, and to carriers hauling certain hazardous materials. The minimum limit depends on what you haul. These are the main tiers from 49 CFR §387.9:
| Who / what you haul | Vehicle size | Federal minimum |
|---|---|---|
| For-hire, interstate, non-hazardous property | 10,001 lbs GVWR or more | $750,000 |
| For-hire or private, oil and listed hazardous materials | 10,001 lbs GVWR or more | $1,000,000 |
| For-hire or private, certain bulk hazardous materials (for example Division 1.1–1.3 explosives, Zone A poison gas) | 10,001 lbs GVWR or more | $5,000,000 |
| For-hire or private, certain bulk hazardous materials | Under 10,001 lbs GVWR | $5,000,000 |
Most general freight carriers fall in the $750,000 tier. That’s why your federal filing can show $750,000 even when your policy carries a $1,000,000 limit for brokers and shippers. We break that down in why your FMCSA filing shows $750,000 when your policy says $1,000,000.
The MCS-90 is an interstate requirement. If you only run within one state, you don’t cross state lines and you don’t have a federal filing, so you don’t need an MCS-90. Your state sets your insurance requirements instead. The one exception is hazardous materials: carriers hauling oil or hazmat in bulk, or highway route controlled quantities of radioactive material, fall under the federal rules even inside one state (49 CFR §387.3). Passenger carriers use a different form, the MCS-90B.
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How the MCS-90 works when there’s a claim
Here’s the part that surprises people. The endorsement says the insurance company will pay any final judgment against you for public liability “regardless of whether or not each motor vehicle is specifically described in the policy,” up to the required federal minimum (FMCSA Form MCS-90).
So if a truck you forgot to schedule, or one that was removed from the policy, is at fault in a wreck, the injured party can still be paid up to that minimum. That protects the motoring public, which is what Congress intended.
It isn’t free coverage
The same form says you agree to reimburse the insurance company for any payment it makes that your policy wouldn’t otherwise have covered. In other words, the MCS-90 works more like a guarantee to the public than coverage for you. An unscheduled truck in a serious accident can turn into a large bill you owe. That’s one reason insurance companies are strict about how trucks are added and removed.
A simple example
Say you buy a second truck and put it to work before it’s added to your policy. It rear-ends a car. Because of the MCS-90, the injured driver’s judgment can still be paid up to $750,000. But the insurance company can then come to you to recover what it paid, because that truck wasn’t a covered auto. Adding the truck first avoids that situation entirely.
What the MCS-90 does not cover
Because it’s built to protect the public, the MCS-90 is narrow. The form itself excludes injury to or death of your own employees on the job and property you haul as cargo.
| Situation | Does the MCS-90 apply? | Coverage that does |
|---|---|---|
| Your truck injures another driver or damages their car | Yes, up to the federal minimum | Auto liability |
| Environmental cleanup after a spill your truck caused | Yes, as part of public liability | Auto liability |
| Damage to the freight you’re hauling | No (excluded as cargo) | Motor truck cargo |
| Damage to your own truck or trailer | No (not public liability) | Physical damage |
| Your driver or employee is hurt on the job | No (employee injury excluded) | Occupational accident or workers’ comp |
| A judgment above the federal minimum | No (only up to the minimum) | Your policy limit and any excess or umbrella |
MCS-90 vs. your federal filing vs. a COI
These get mixed up constantly, especially the first two. The MCS-90 and your federal filing are not the same thing. The MCS-90 is part of your policy. Your federal filing is a separate certificate the insurance company submits to FMCSA so your operating authority stays active. One doesn’t replace the other:
| Document | What it is | Who sees it |
|---|---|---|
| MCS-90 | An endorsement attached to your auto liability policy | Stays with your policy; you keep proof at your principal place of business |
| BMC-91X | An electronic filing the insurance company makes with FMCSA to show you’re insured | FMCSA and anyone checking your authority |
| Certificate of insurance (COI) | A summary of your coverage for a specific holder | Brokers, shippers, and lessors who ask for it |
An active filing doesn’t always mean you’re covered
Brokers and shippers often look at your FMCSA record and assume an active filing means your insurance is in force. It’s a useful check, but it isn’t the whole picture:
- ■A filing stays active until it’s canceled. Under 49 CFR §387.313, the insurance company cancels a filing with Form BMC-35, and the cancellation takes effect 30 days after FMCSA receives it. A policy that’s being canceled, for nonpayment for example, can still show an active filing during that window.
- ■A filing shows the federal minimum, not your coverage. It doesn’t show your actual limit, which trucks or drivers are on the policy, or whether you carry cargo or physical damage.
- ■It works the other way, too. Coverage can be bound before the insurance company’s filing posts, so a brand-new policy may not show on your FMCSA record for a few days.
Your policy and a current certificate of insurance show what’s actually covered. The FMCSA record shows that a federal filing is on file. As FMCSA moves carrier registration into its new Motus system, it’s still worth checking your record now and then. If something looks off, call your insurance agent so they can follow up with the insurance company.
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Canceling a policy with an MCS-90
The MCS-90 stays in effect continuously until it’s properly canceled. Under the form, either you or the insurance company can cancel with 35 days’ written notice to the other party. If you’re subject to FMCSA registration, 30 days’ notice to FMCSA is also required.
That’s why cancellations in trucking take time to process and why you may see a notice weeks before coverage actually ends. If a cancellation notice shows up, don’t ignore it. Our guide to common policy cancellation misconceptions explains what happens next.
Five ways to stay on the right side of the MCS-90
- ✓Add every truck before it runs. Don’t rely on the MCS-90 to cover an unscheduled unit. You could owe the insurance company back.
- ✓Remove trucks the right way. Keep the lease termination or bill of sale handy so removals are clean and dated correctly.
- ✓Match your names. Your policy should list your exact legal name as it appears with FMCSA.
- ✓Carry the right limit for your freight. Hauling hazmat or oil can move you to a $1,000,000 or $5,000,000 federal minimum.
- ✓Know what’s on your policy. Our guide to reading your trucking insurance policy walks through the endorsements page.
MCS-90 Frequently Asked Questions
Is the MCS-90 the same as my liability insurance?
No. Your auto liability policy is the coverage. The MCS-90 is an endorsement attached to that policy. It guarantees the public will be paid up to the federal minimum when your truck is at fault, even in situations the policy might not otherwise cover.
Does the MCS-90 cover a truck that isn’t listed on my policy?
It can. The endorsement says the insurance company will pay a final judgment for public liability regardless of whether each vehicle is specifically described in the policy, up to the federal minimum. But you agree to pay the insurance company back for anything it pays that your policy wouldn’t otherwise cover.
Does the MCS-90 cover cargo or my own truck?
No. The form excludes property you haul as cargo and injury to or death of your own employees on the job. Damage to your own truck isn’t public liability either. Those risks need motor truck cargo, physical damage, and occupational accident or workers’ compensation coverage.
Who needs an MCS-90?
Carriers running interstate: for-hire carriers hauling property across state lines in vehicles of 10,001 pounds GVWR or more, plus for-hire and private carriers hauling certain hazardous materials. Intrastate-only carriers don’t need an MCS-90 because they don’t cross state lines and don’t have a federal filing. The exception is bulk hazardous materials and highway route controlled radioactive loads, which fall under the federal rules even within one state.
Who files the MCS-90 with FMCSA?
The MCS-90 isn’t filed with FMCSA. It’s attached to your policy by the insurance company, and you keep proof at your principal place of business. The federal filing that shows FMCSA you’re insured is a separate form, usually the BMC-91X, and the insurance company files it.
Does an active FMCSA filing mean my insurance is in force?
Not always. A filing shows FMCSA that you meet the federal minimum, and it stays active until the insurance company cancels it. Under 49 CFR 387.313, a cancellation takes effect 30 days after FMCSA receives the notice, so a policy being canceled can still show an active filing. A filing also doesn’t show your actual limits, which trucks are scheduled, or whether you carry cargo or physical damage. Your policy and a current certificate of insurance show what’s actually covered.
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Questions about your MCS-90, limits, or filings? A MIG Producer can walk you through it. Available Mon–Fri, 8 AM–5 PM ET.
This article is general information, not legal advice. Coverage, limits, and claim decisions are made by the insurance company under the terms of your policy. Marquee Insurance Group is an insurance agency. See also: trucking insurance terms and insurance for new authorities.
Sources: 49 CFR Part 387, Subpart A (eCFR) · FMCSA: Form MCS-90 · FMCSA Form MCS-90 (PDF) · 49 CFR §387.313 (filings and cancellation)
