Definition:Policy trigger
⚡ Policy trigger is the event, condition, or circumstance that activates coverage under an insurance policy, determining which policy period responds to a given loss. Different types of triggers — occurrence, claims-made, manifestation, and exposure — define the moment at which the insurer's obligation to pay begins. The trigger mechanism is especially consequential in liability lines, where the injurious event, the discovery of harm, and the filing of a claim may span years or even decades.
🔎 Under an occurrence trigger, coverage attaches when the loss-causing event takes place during the policy period, regardless of when the claim is later reported. A claims-made trigger, by contrast, responds when the claim is first made against the insured during the active policy period (or an applicable extended reporting period). Professional liability, D&O, and cyber policies commonly use claims-made triggers because the lag between wrongful acts and claim notification can be substantial. In long-tail exposures such as asbestos or environmental contamination, courts have applied continuous or "triple trigger" theories, holding that every policy in effect from initial exposure through manifestation of injury may be called upon to respond.
🧩 Selecting and understanding the right trigger mechanism has profound implications for both underwriters and policyholders. For carriers, the trigger type shapes reserving methodology, reinsurance recoveries, and the duration of loss development tails. For insureds, misunderstanding how a trigger works can result in unintended gaps — particularly during policy transitions, when switching from an occurrence form to a claims-made form without securing adequate prior acts coverage or tail coverage. Litigation over which trigger applies has generated some of the most significant and costly coverage disputes in insurance history, underscoring why precise policy language on this point is non-negotiable.
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