The MCS-90 Endorsement: How Truck Accident Victims Get Paid When the Insurer Denies Coverage

By Lynda S. Brennan, Attorney at Shiner Law Group • July 2026

After a serious truck crash, it is common for the trucking company’s insurer to deny coverage — arguing the truck was not on the policy, the driver was excluded, or an exclusion applies. For injured members of the public, a little-known federal endorsement called the MCS-90 can change that outcome entirely. Here is how it works and why it matters.

What Is the MCS-90 Endorsement?

The MCS-90 is a federally mandated endorsement attached to certain commercial motor carrier insurance policies. It is required under the Motor Carrier Act of 1980 and federal regulations at 49 C.F.R. Part 387. Importantly, it is not traditional insurance coverage — it operates more like a financial guarantee or surety obligation. Its purpose is to ensure that innocent members of the public injured by federally regulated motor carriers are compensated, even when the insurer may have a coverage defense under the policy.

Why Does the MCS-90 Exist?

Before these regulations, a trucking company could injure someone and its insurer could then deny coverage based on technical policy defenses, leaving the injured person with no recovery. Congress created federal financial-responsibility requirements to prevent exactly that. The public policy is straightforward: commercial motor carriers operating on public highways should have financial responsibility available to compensate injured members of the public. The focus shifts from protecting the insured to protecting the public.

Who Is Required to Have an MCS-90?

Generally, for-hire motor carriers who transport property, operate commercial motor vehicles, operate in interstate commerce, and are subject to FMCSA financial-responsibility requirements. Key questions that determine whether it applies include:

• Does the company have a USDOT or MC number?
• Does it transport goods for compensation?
• Does it cross state lines or move goods in interstate commerce?
• Was it operating as a regulated motor carrier at the time?

How Much Protection Does It Provide?

The MCS-90 does not create unlimited coverage. It is tied to the minimum financial-responsibility requirements under federal law, which depend on the carrier and cargo. The baseline minimum for general freight is $750,000, rising to $1 million for oil and up to $5 million for hazardous materials.

How the MCS-90 Helps Injured Victims

Consider a common scenario: a trucking company causes a crash, the injured party obtains a judgment, and the insurer says the vehicle was not scheduled on the policy, the driver was excluded, or an exclusion applies. The MCS-90 can require the insurer to pay the injured member of the public anyway. In effect it says: that coverage dispute may be true between the insurer and the trucking company, but the injured member of the public must still be protected.

An Important Limitation

The MCS-90 does not create normal insurance coverage and does not rewrite the policy. It does not mean the truck was “covered.” It simply means that even where there may be no coverage, federal law may require payment to protect the public. And if the insurer pays only because of the MCS-90, it can seek reimbursement from its insured — the trucking company. Either way, the injured person is made whole first.

How We Investigate Whether an MCS-90 Applies

The first step is never to accept the carrier’s denial at face value. We determine whether federal financial-responsibility obligations exist by checking public and licensing databases and by pinning down what the truck was actually doing.

Public and licensing records

We search FMCSA and the SAFER (Safety and Fitness Electronic Records) System by company name, USDOT number, and MC number, looking for active operating authority, for-hire status, interstate operations, and insurance filings. In the FMCSA Licensing & Insurance database we look for BMC-91 or BMC-91X filings (proof of financial responsibility), the insurer listed, and the effective dates.

What the truck was doing

We establish whether the driver was under dispatch, whether there was a load assignment, where the truck was coming from and going, whether it was transporting cargo, and whether it was traveling to pick up or returning from an interstate load. Documents we request include dispatch records, bills of lading, trip documents, driver logs and ELD data, and the complete policy with all endorsements — including the MCS-90.

What This Means If You Were Hit by a Truck

A coverage denial is not the end of the road. Between the MCS-90, multiple potentially liable parties, and layered commercial policies, there are often more sources of recovery than a victim realizes. The key is a fast, thorough investigation before evidence and filings become harder to trace.

This article is provided by Shiner Law Group for general informational purposes only and is not legal advice; reading it does not create an attorney-client relationship. Florida and federal trucking law is fact-specific and changes over time — consult a licensed Florida attorney about your situation. Attorneys at Shiner Law Group are Members of The Florida Bar. This is attorney advertising.