Excess insurance provides an additional layer of protection after the underlying policy or self-insured layer has been exhausted. In plain language, it is backup coverage for losses too large for the first layer to handle.
How the layering works
Large liability programs often stack multiple layers:
- a primary policy pays first
- the insured may keep a self-insured retention in some structures
- one or more excess layers sit above the underlying amount
The point where the excess layer begins to pay is often called the attachment point. Some excess policies follow the terms of the underlying coverage closely, while others contain their own conditions, exclusions, and notice requirements.
Why businesses buy it
Primary liability limits can be too small for catastrophic lawsuits. Excess insurance gives the insured more total capacity without rewriting the entire first layer. It is common for commercial auto, general liability, products liability, and other high-severity risks.
Claims on excess programs can be complicated. The parties may dispute whether the underlying limits were properly exhausted, whether defense costs erode those limits, and whether the excess form follows the primary policy closely enough for the same coverage result.
Practical example
A manufacturer has a $1 million primary liability policy and a $4 million excess layer above it. A products claim settles for $3.2 million. The primary carrier pays its $1 million limit, and the excess insurer responds for the covered amount above that layer, subject to the excess policy’s own terms.