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📜 '''Non-cumulation clause''' is a policy provision designed to prevent a [[Definition:Policyholder | policyholder]] from recovering more than one [[Definition:Limit of liability | limit of liability]] when a single [[Definition:Loss | loss]] or [[Definition:Occurrence | occurrence]] spans multiple policy periods or triggers coverage under more than one policy issued by the same [[Definition:Insurance carrier | insurer]]. Found predominantly in [[Definition:Liability insurance | liability]] and [[Definition:Property insurance | property]] lines — particularly [[Definition:Commercial general liability (CGL) | commercial general liability]], [[Definition:Professional indemnity insurance | professional indemnity]], and [[Definition:Directors and officers liability insurance (D&O) | directors and officers]] policies — the clause addresses scenarios where long-tail [[Definition:Claims | claims]] or continuous exposures such as [[Definition:Environmental liability | environmental contamination]], [[Definition:Asbestos liability | asbestos]], or ongoing professional negligence could theoretically stack limits across successive policy years.

🔄 The clause works by stipulating that when a loss is covered or could have been covered under a prior policy from the same insurer, the current policy's limit is reduced by the amount available under the earlier policy — or, in some formulations, by the amount actually paid. This prevents an insured from claiming up to the full limit under each successive annual policy for what is essentially a single continuing loss event. The precise wording varies considerably: some non-cumulation clauses operate as an offset mechanism, while others function more like an [[Definition:Other insurance clause | other insurance]] provision. Courts in the United States and the United Kingdom have interpreted these clauses differently, and disputes over their application have generated significant [[Definition:Insurance coverage litigation | coverage litigation]], especially in connection with long-tail [[Definition:Mass tort | mass tort]] exposures where the trigger of coverage — whether [[Definition:Occurrence trigger | occurrence]], [[Definition:Exposure trigger | exposure]], [[Definition:Manifestation trigger | manifestation]], or [[Definition:Continuous trigger | continuous]] — determines how many policy years respond.

⚠️ Getting the non-cumulation clause right is consequential for both insurers and policyholders. For [[Definition:Underwriting | underwriters]] and [[Definition:Reinsurance | reinsurers]], a well-drafted clause caps cumulative exposure across policy years, protecting against the catastrophic aggregation of limits that can arise from latent or slowly developing losses. For [[Definition:Broker | brokers]] and risk managers, understanding the clause is essential during [[Definition:Policy placement | placement]] negotiations, because an aggressive non-cumulation provision can effectively erode the coverage a policyholder believes it purchased if a loss straddles multiple policy periods. In [[Definition:Reinsurance treaty | reinsurance]], parallel provisions — sometimes called "interlocking clauses" — serve a similar de-stacking function. As long-tail liabilities continue to emerge in areas like [[Definition:Per- and polyfluoroalkyl substances (PFAS) | PFAS contamination]] and [[Definition:Cyber insurance | cyber]] breaches with delayed discovery, the non-cumulation clause remains a closely scrutinized and frequently contested element of policy language.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence]]
* [[Definition:Stacking of limits]]
* [[Definition:Other insurance clause]]
* [[Definition:Long-tail liability]]
* [[Definition:Continuous trigger]]
* [[Definition:Anti-stacking provision]]
{{Div col end}}

Definition:Non-cumulation clause - Revision history

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