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📐 '''Coverage layer''' describes a defined segment of [[Definition:Insurance | insurance]] or [[Definition:Reinsurance | reinsurance]] protection that responds to losses within a specified range, bounded by an [[Definition:Attachment point | attachment point]] at the bottom and a limit at the top. Layered programs are fundamental to how large or complex risks are structured across the insurance and reinsurance markets, enabling multiple [[Definition:Insurer | insurers]] or [[Definition:Reinsurer | reinsurers]] to participate in different tranches of the same risk according to their [[Definition:Risk appetite | risk appetite]] and pricing expectations. The concept applies across nearly all lines of business but is especially prevalent in [[Definition:Commercial insurance | commercial]], [[Definition:Excess and surplus lines | excess and surplus]], and [[Definition:Treaty reinsurance | treaty reinsurance]] placements.

⚙️ In a typical layered program, the [[Definition:Policyholder | insured]] or [[Definition:Cedent | cedent]] retains the first portion of loss — the [[Definition:Retention | retention]] or [[Definition:Self-insured retention (SIR) | self-insured retention]] — and then a primary layer responds up to its limit. Above that, one or more excess layers attach sequentially, each picking up where the layer below exhausts. For instance, a commercial property tower might include a primary layer of $10 million, a first excess layer of $15 million excess of $10 million, and additional layers stacking upward to provide hundreds of millions in total capacity. Each layer is typically placed with different [[Definition:Insurance carrier | carriers]] or [[Definition:Lloyd's syndicate | syndicates]], priced independently to reflect the probability and severity of losses reaching that stratum. In reinsurance markets — particularly at [[Definition:Lloyd's of London | Lloyd's]] and in Bermuda — layering allows [[Definition:Underwriter | underwriters]] to deploy capital precisely at the risk level they are most comfortable with, and [[Definition:Insurance broker | brokers]] structure towers to optimize cost and capacity across global markets.

💡 Layering transforms how risk is distributed across the insurance ecosystem. Without the ability to divide exposure into discrete segments, many large risks would be uninsurable because no single carrier could absorb the full potential loss. For buyers, layered programs offer flexibility: they can adjust retentions upward to reduce premium spend, or add higher-attaching layers when their exposure profile changes. For insurers and reinsurers, participating on a specific layer provides clarity on maximum exposure and enables more precise [[Definition:Pricing | pricing]] and [[Definition:Loss reserve | reserving]]. Disputes sometimes arise at layer boundaries — particularly around whether aggregated losses from a single [[Definition:Occurrence | occurrence]] pierce into higher layers — making the precise wording of [[Definition:Policy language | policy language]] and the definition of occurrence critically important across jurisdictions.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Attachment point]]
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Retention]]
* [[Definition:Insurance tower]]
* [[Definition:Aggregate limit]]
* [[Definition:Risk appetite]]
{{Div col end}}

Definition:Coverage layer - Revision history

PlumBot: Bot: Creating new article from JSON