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📋 '''Excess liability insurance''' is a form of [[Definition:Liability insurance | liability coverage]] designed to extend protection beyond the limits of an underlying [[Definition:Primary insurance | primary policy]]. Purchased by businesses, professionals, and other organizations facing significant [[Definition:Liability | liability]] exposures, it adds a supplemental layer of [[Definition:Policy limit | limits]] that responds once the primary layer has been exhausted. This type of coverage is distinct from — though often confused with — [[Definition:Umbrella insurance | umbrella insurance]], which may broaden the scope of covered perils in addition to increasing limits.

🔗 The mechanics hinge on the relationship between the excess policy and the underlying coverage. Most excess liability policies are written on a [[Definition:Follow-form policy | follow-form]] basis, meaning they adopt the same terms, conditions, and exclusions as the primary policy beneath them. When a [[Definition:Claim | claim]] surpasses the primary [[Definition:Policy limit | limit]], the excess layer kicks in and pays up to its own stated limit. In large [[Definition:Commercial insurance | commercial]] programs — particularly those involving [[Definition:Professional liability insurance | professional liability]], [[Definition:Commercial general liability (CGL) | general liability]], or [[Definition:Commercial auto insurance | commercial auto]] — multiple excess layers may be stacked, each with a different [[Definition:Excess insurer | excess insurer]], to achieve aggregate limits running into the hundreds of millions of dollars. [[Definition:Insurance broker | Brokers]] play a pivotal role in structuring these towers and negotiating consistent terms across layers.

💡 Without excess liability insurance, organizations would face a stark choice: accept uncovered exposure above their primary limits or pay dramatically higher [[Definition:Premium | premiums]] for a single policy with elevated limits. The layered model distributes [[Definition:Risk transfer | risk]] across multiple [[Definition:Insurance carrier | carriers]], making high-limit programs economically feasible. For [[Definition:Underwriting | underwriters]] pricing these layers, the key challenge lies in modeling the probability that losses will reach and penetrate each successive [[Definition:Attachment point | attachment point]] — a discipline that draws heavily on [[Definition:Actuarial science | actuarial analysis]] and historical [[Definition:Loss data | loss data]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Umbrella insurance]]
* [[Definition:Excess insurer]]
* [[Definition:Follow-form policy]]
* [[Definition:Attachment point]]
* [[Definition:Primary insurance]]
* [[Definition:Layered insurance program]]
{{Div col end}}

Definition:Excess liability insurance - Revision history

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