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⚡ '''Triggering event''' is the specific occurrence or condition that activates coverage under an [[Definition:Insurance policy | insurance policy]], determining when the insurer's obligation to pay a [[Definition:Claims | claim]] or provide a defense begins. In insurance, the concept is far from academic — disputes over what constitutes the triggering event have produced some of the most consequential [[Definition:Coverage litigation | coverage litigation]] in the industry's history, particularly in [[Definition:Long-tail insurance | long-tail]] lines such as [[Definition:Asbestos liability | asbestos]], [[Definition:Environmental liability insurance | environmental]], and [[Definition:Product liability insurance | product liability]] insurance. The trigger determines which policy year responds to a loss, and in cases involving latent injuries or progressive damage, that determination can shift billions of dollars in [[Definition:Liability | liability]] among [[Definition:Insurance carrier | insurers]] across decades of policy periods.

🔄 Courts and [[Definition:Policy wording | policy language]] have recognized several trigger theories, each with distinct implications for how [[Definition:Claims | claims]] are allocated. The exposure trigger holds that coverage is activated during any period when the claimant was exposed to the harmful condition; the manifestation trigger assigns the loss to the policy in effect when the injury or damage became apparent; the injury-in-fact trigger looks to when actual injury occurred regardless of discovery; and the continuous trigger — applied most famously in long-tail [[Definition:Asbestos liability | asbestos]] cases — treats every policy from first exposure through manifestation as potentially triggered. For [[Definition:Occurrence-based policy | occurrence-based policies]], the triggering event defines which policy period's [[Definition:Policy limit | limits]] and [[Definition:Retention | retentions]] apply, while for [[Definition:Claims-made policy | claims-made policies]], the trigger is typically the date the claim is first reported to the insurer, which simplifies the analysis but introduces its own complexities around [[Definition:Retroactive date | retroactive dates]] and [[Definition:Extended reporting period (ERP) | extended reporting periods]].

🧩 Understanding triggering events is indispensable for [[Definition:Underwriting | underwriters]], [[Definition:Claims adjuster | claims professionals]], and [[Definition:Reserving | reserving]] actuaries alike. When a new mass tort or latent exposure theory emerges — as has occurred with [[Definition:Per- and polyfluoroalkyl substances (PFAS) | PFAS contamination]], concussive brain injuries, and [[Definition:Cyber insurance | cyber]] privacy breaches — the applicable trigger theory governs how deeply into legacy policy years the [[Definition:Loss | losses]] will reach. Insurers that wrote [[Definition:General liability insurance | general liability]] decades ago may find their historical policies responding to claims they never anticipated, underscoring the importance of precise [[Definition:Policy wording | policy wording]] and clear trigger language in current-generation forms. For [[Definition:Reinsurance | reinsurers]], the cedent's trigger allocation methodology directly affects which reinsurance contracts are implicated, making it a critical element of both [[Definition:Claims | claims]] negotiation and [[Definition:Commutation | commutation]] discussions.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence-based policy]]
* [[Definition:Claims-made policy]]
* [[Definition:Long-tail insurance]]
* [[Definition:Coverage litigation]]
* [[Definition:Continuous trigger]]
* [[Definition:Manifestation trigger]]
{{Div col end}}

Definition:Triggering event - Revision history

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