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⏪ '''Prior acts exclusion''' is a provision in [[Definition:Claims-made policy | claims-made]] insurance policies that eliminates coverage for [[Definition:Claims | claims]] arising from acts, errors, or omissions that occurred before a specified date — typically called the [[Definition:Retroactive date | retroactive date]]. In [[Definition:Professional liability insurance | professional liability]], [[Definition:Directors and officers liability insurance (D&O) | D&O]], and [[Definition:Cyber insurance | cyber insurance]] markets around the world, this exclusion determines how far back in time an insured's conduct is protected. If a policy carries a retroactive date of January 1, 2020, any claim arising from professional work performed before that date falls outside coverage, regardless of when the claim is first made.

🔧 Carriers use prior acts exclusions as a risk selection and pricing tool. When an insured first purchases a claims-made policy, the [[Definition:Underwriter | underwriter]] sets a retroactive date — often the inception date of the first policy, which means no prior acts coverage exists at all until the insured renews continuously with the same or successor carrier. Over successive renewal cycles, the retroactive date remains anchored to that original inception, and the growing tail of covered prior acts becomes one of the key values embedded in the policy. Switching carriers mid-stream introduces friction: the new insurer may impose a fresh retroactive date, effectively resetting the clock and leaving a gap for work performed in earlier years. To bridge this gap, the prior carrier may offer an [[Definition:Extended reporting period (ERP) | extended reporting period]] — sometimes called a "tail" — and the new carrier may negotiate to match or advance the retroactive date if the risk profile is attractive. In the [[Definition:London market | London market]] and [[Definition:Lloyd's of London | Lloyd's]], where complex professional indemnity placements are common, the negotiation of retroactive dates and prior acts coverage is a routine and commercially significant part of the placement process.

💡 The practical stakes of a prior acts exclusion become acute when an insured faces a claim rooted in work completed years earlier — a common scenario in professions such as architecture, consulting, and financial advisory, where the consequences of an error may not surface for a long time. An insured who has let coverage lapse, changed carriers without securing retroactive continuity, or allowed a retroactive date to move forward may discover a devastating gap precisely when a major claim materializes. For [[Definition:Insurance broker | brokers]], advising clients on the importance of maintaining continuous [[Definition:Claims-made policy | claims-made]] coverage without retroactive date erosion is one of the most critical duties in professional lines placement. Failure to manage this detail has been the basis of numerous [[Definition:Errors and omissions insurance (E&O) | broker E&O]] claims, underscoring that the prior acts exclusion is not merely a technical policy feature but a fulcrum of real financial exposure.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Retroactive date]]
* [[Definition:Claims-made policy]]
* [[Definition:Extended reporting period (ERP)]]
* [[Definition:Professional liability insurance]]
* [[Definition:Continuity date]]
* [[Definition:Nose coverage]]
{{Div col end}}

Definition:Prior acts exclusion - Revision history

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