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📑 '''Stacking of limits''' is the practice of adding together the [[Definition:Policy limit | policy limits]] from multiple [[Definition:Insurance policy | insurance policies]] or multiple coverage periods to create a larger pool of available [[Definition:Indemnity | indemnification]] for a single [[Definition:Claim | claim]] or related series of claims. While closely related to the broader concept of [[Definition:Stacking | stacking]], the phrase "stacking of limits" emphasizes the quantitative dimension — how much total coverage an insured can access — and arises most frequently in [[Definition:Long-tail liability | long-tail liability]] disputes, [[Definition:Asbestos claim | asbestos litigation]], [[Definition:Environmental liability | environmental claims]], and complex [[Definition:Commercial insurance | commercial insurance]] programs involving layered or consecutive policies.

🔄 In practice, stacking of limits becomes contentious when a loss or series of losses spans multiple policy periods and the insured argues that each triggered policy's limits should contribute independently. For example, if a manufacturer faces [[Definition:Product liability | product liability]] claims arising from exposure that occurred over a decade, it may seek to stack the limits of every [[Definition:Occurrence-based policy | occurrence-based policy]] in force during that period. [[Definition:Insurance carrier | Carriers]] respond with [[Definition:Non-cumulation clause | non-cumulation clauses]], [[Definition:Batching provision | batching provisions]], or [[Definition:Prior insurance clause | prior insurance]] language designed to cap aggregate exposure. The legal landscape is deeply jurisdiction-dependent: some courts apply "all sums" allocation methods that effectively enable stacking, while others use "pro rata" allocation that limits each policy's contribution to its proportional share.

💡 Understanding stacking of limits is critical for [[Definition:Reinsurance | reinsurers]] as well as primary [[Definition:Insurance carrier | insurers]], because the total exposure flowing through a ceded program can multiply if stacking is permitted. [[Definition:Actuarial analysis | Actuaries]] building [[Definition:Loss reserve | reserve]] estimates for long-tail books must model various stacking scenarios to capture the range of potential outcomes. For [[Definition:Risk manager | risk managers]] structuring [[Definition:Insurance program | insurance programs]], awareness of how limits may or may not stack informs decisions about [[Definition:Policy period | policy period]] alignment, [[Definition:Excess insurance | excess layer]] attachment points, and the selection of carriers whose policy forms contain favorable or unfavorable stacking language.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Stacking]]
* [[Definition:Non-cumulation clause]]
* [[Definition:Other insurance clause]]
* [[Definition:Long-tail liability]]
* [[Definition:Policy limit]]
* [[Definition:Allocation of loss]]
{{Div col end}}

Definition:Stacking of limits - Revision history

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