The MCS-90 Endorsement

What the MCS-90 actually is

The MCS-90 is an endorsement attached to a motor carrier's liability policy. Its formal name is the Endorsement for Motor Carrier Policies of Insurance for Public Liability, and it exists because Congress wanted a guarantee that a member of the public injured by a truck could actually collect.

Here is the part almost nobody explains properly. The MCS-90 is not coverage for you. It is a promise from your insurer to the public.

Under the endorsement, the insurer agrees to pay any final judgment against you for public liability up to the required limit, even if the loss would not have been covered under your policy. Maybe the truck was not on the schedule. Maybe you were hauling a commodity the policy excluded. Maybe a condition was breached. The MCS-90 says the injured party still gets paid.

And then comes the sentence that matters most to you. The endorsement gives the insurer the right to recover from you every dollar they paid that your policy did not actually cover.

Why that distinction is not academic

Imagine a truck you added last month and forgot to report. It is in an accident, someone is seriously injured, and a judgment lands at eight hundred thousand dollars. Your policy does not cover the unscheduled unit, so ordinarily the carrier would deny.

With an MCS-90 attached, the insurer pays the injured party up to the federal limit. Then they send you a bill for the entire amount. The public is protected. You are not. You are exactly as exposed as if you had no insurance at all, just with an extra step in between.

So when someone says you are fine because you have an MCS-90, they are describing regulatory compliance, not protection. The only thing that protects your business is the underlying policy being written correctly, with the right vehicles listed, the right commodities disclosed, and the right limits in place.

Which limit applies to you

The required limits sit in 49 CFR Part 387, and they depend on what you haul rather than how big you are. The broad structure is as follows, and the exact category language matters, so confirm your specific commodity rather than guessing.

• Seven hundred fifty thousand dollars for general freight in vehicles with a gross vehicle weight rating of 10,001 pounds or more. This is the number most carriers know.
• One million dollars for oil and for hazardous materials, hazardous wastes, and hazardous substances that fall outside the highest risk categories.
• Five million dollars for the most dangerous categories. This includes hazardous substances carried in cargo tanks, portable tanks, or hopper type vehicles with capacity over 3,500 water gallons, along with bulk Class 1 explosives in the higher divisions, Division 2.3 Hazard Zone A poison gases, and highway route controlled quantities of Class 7 radioactive material.

If you are a tank operator, read our tanker truck insurance page, because the five million dollar tier catches more operations than people expect and it changes the structure of the whole program.

The environmental restoration piece

One feature of the MCS-90 that gets overlooked is that the guarantee covers public liability, which the regulation defines to include bodily injury, property damage, and environmental restoration.

That last item is why the endorsement is so significant for anyone hauling anything that can spill. Cleanup and remediation costs following a release are within the scope of what the endorsement guarantees to the public. They are also within the scope of what your insurer can then come back and collect from you if your policy did not truly cover the loss.

Which is the whole argument for buying genuine pollution liability coverage rather than treating the MCS-90 as if it were environmental insurance. It is not.

How the endorsement relates to your filing

People mix these up constantly, so to be clear about the sequence.

The MCS-90 is an endorsement on your policy document. The filing is a separate act where your insurance company electronically notifies the FMCSA that the required coverage exists, using a form such as the BMC-91 or the BMC-91X. Your authority is not active until that filing shows on your record, and if the filing is cancelled your authority is revoked.

So you need both. The endorsement makes the guarantee. The filing tells the government the guarantee exists.

Does the MCS-90 apply if you are intrastate only

The federal requirement applies to interstate operations. If you run entirely within one state you are governed by that state's requirements instead, which usually means a state level filing such as a Form E rather than a federal one, at limits your state sets.

Be careful with the definition though. Interstate commerce is about where the freight is going, not just where your truck drives. Hauling a container from a port to a warehouse thirty miles away can still be interstate commerce if the freight is in the middle of an interstate or international journey. Plenty of carriers who think they are intrastate are not.

What to do with all of this

The practical takeaway is simple. Do not let the MCS-90 become a substitute for having your policy right. Make sure every power unit is scheduled, make sure the commodities you actually haul are disclosed and not excluded, and make sure your limits are correct for your commodity tier.

We handle the endorsement and the filings as a matter of routine, but the part worth your attention is the commercial auto liability policy sitting underneath. Send us your DOT number and what you haul and we will confirm you are in the right tier and that nothing important is missing.