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📌 '''Occurrence (insurance)''' is a foundational concept in [[Definition:Liability insurance | liability insurance]] that defines a covered event as an accident or continuous exposure to conditions that results in [[Definition:Bodily injury | bodily injury]] or [[Definition:Property damage | property damage]] neither expected nor intended by the [[Definition:Insured | insured]]. Unlike a [[Definition:Claims-made policy | claims-made]] trigger, which looks to when a [[Definition:Claim | claim]] is reported, an occurrence-based trigger ties coverage to when the injurious event actually took place — regardless of when the claim is eventually filed. This distinction is one of the most consequential structural choices in [[Definition:Insurance policy | policy]] design and shapes everything from [[Definition:Reserving | reserving]] to [[Definition:Reinsurance | reinsurance]] purchasing.

🔎 Under an [[Definition:Occurrence-based policy | occurrence-based policy]], the insured is protected for events happening during the [[Definition:Policy period | policy period]] even if the resulting claim surfaces years or decades later. Consider a [[Definition:General liability insurance | general liability]] policy effective in 2015: if a product sold that year causes injury in 2025, the 2015 policy responds. Each occurrence is subject to a [[Definition:Per-occurrence limit | per-occurrence limit]] and a [[Definition:Deductible | deductible]], and multiple claims stemming from the same event are typically aggregated as a single occurrence. Determining what constitutes "one occurrence" versus multiple occurrences — especially in mass tort or environmental scenarios — frequently becomes the central issue in complex [[Definition:Coverage litigation | coverage litigation]].

💡 The practical significance of how "occurrence" is defined extends well beyond policy wording. For [[Definition:Insurance carrier | insurers]], long-tail occurrence exposure creates [[Definition:Incurred but not reported (IBNR) | IBNR]] reserve challenges because losses may emerge far into the future. For [[Definition:Reinsurer | reinsurers]], the definition directly affects how [[Definition:Excess of loss reinsurance | excess of loss]] treaties attach and how [[Definition:Loss development | loss development]] patterns are modeled. And for policyholders, especially in industries with latent exposure like construction or manufacturing, an occurrence policy offers the comfort of perpetual coverage for past acts without needing to maintain continuous [[Definition:Tail coverage | tail coverage]]. Misunderstanding this term can leave both carriers and insureds exposed to outcomes they never anticipated.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence trigger]]
* [[Definition:Claims-made policy]]
* [[Definition:Occurrence-based policy]]
* [[Definition:Bodily injury]]
* [[Definition:Per-occurrence limit]]
* [[Definition:Incurred but not reported (IBNR)]]
{{Div col end}}

Definition:Occurrence (insurance) - Revision history

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