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🌅 '''Sunset clause''' is a contractual provision that sets an automatic expiration date on a specific obligation, coverage extension, or regulatory measure unless affirmative action is taken to renew it. In insurance and [[Definition:Reinsurance | reinsurance]] agreements, sunset clauses commonly appear in [[Definition:Run-off | run-off]] arrangements, [[Definition:Commutation agreement | commutation]] negotiations, and [[Definition:Binding authority agreement | binding authority agreements]] to ensure that lingering [[Definition:Liability | liabilities]] or [[Definition:Delegated underwriting authority (DUA) | delegated authorities]] do not persist indefinitely. They also feature in insurance legislation and [[Definition:Regulatory framework | regulatory frameworks]], where lawmakers embed them to force periodic reassessment of whether a rule still serves its purpose.

⚙️ In practice, a sunset clause defines a trigger—usually a date or the passage of a set period—after which the relevant provision lapses automatically. For example, a [[Definition:Reinsurer | reinsurer]] might agree to honor [[Definition:Claim | claims]] reported under a discontinued [[Definition:Treaty reinsurance | treaty]] only if they are filed within three years of the treaty's termination; any claim surfacing after that window is excluded. Similarly, a [[Definition:Coverholder | coverholder's]] authority to bind risks on behalf of a [[Definition:Lloyd's syndicate | Lloyd's syndicate]] may include a sunset mechanism that revokes that authority if the [[Definition:Capacity | capacity]] agreement is not formally renewed, preventing unauthorized [[Definition:Underwriting | underwriting]] activity.

💡 These provisions protect both [[Definition:Insurance carrier | insurers]] and counterparties from open-ended exposure that can distort [[Definition:Reserve | reserve]] estimates and complicate [[Definition:Portfolio | portfolio]] management. Without a clear cutoff, legacy books of business can generate surprise [[Definition:Loss | losses]] decades after the original coverage was written—an especially acute concern in long-tail lines such as [[Definition:Asbestos liability | asbestos]] and [[Definition:Environmental liability insurance | environmental liability]]. For regulators, sunset clauses embedded in insurance statutes ensure that market rules evolve alongside the industry rather than becoming outdated fixtures that hinder innovation.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Run-off]]
* [[Definition:Commutation agreement]]
* [[Definition:Tail coverage]]
* [[Definition:Binding authority agreement]]
* [[Definition:Long-tail liability]]
* [[Definition:Policy period]]
{{Div col end}}

Definition:Sunset clause - Revision history

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