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📊 '''Coverage allocation''' is the process of apportioning responsibility for a [[Definition:Loss | loss]] or [[Definition:Claim | claim]] across multiple [[Definition:Insurance policy | insurance policies]], policy periods, or coverage sections when more than one source of coverage potentially responds. This challenge arises frequently in [[Definition:Long-tail liability | long-tail liability]] lines — such as [[Definition:Asbestos liability | asbestos]], [[Definition:Environmental liability | environmental contamination]], and [[Definition:Construction defect | construction defect]] claims — where the injury or damage spans many years and triggers policies issued by different [[Definition:Insurance carrier | insurers]] across successive policy periods. Courts, insurers, and [[Definition:Policyholder | policyholders]] have long disputed how to allocate these obligations, and the rules vary significantly by jurisdiction.

⚙️ Several allocation methodologies compete in practice. Under "all sums" (or "joint and several") allocation, the policyholder can select any triggered policy period and demand that its insurer pay the entire loss up to the [[Definition:Policy limit | policy limit]], leaving that insurer to seek [[Definition:Contribution | contribution]] from other triggered carriers. Under "pro rata" allocation, responsibility is distributed across all triggered policy periods — and sometimes across uninsured or self-insured periods — based on time on risk or some other proportional measure. The choice of methodology can shift tens or hundreds of millions of dollars between insurers, policyholders, and uninsured gaps. [[Definition:Claims adjuster | Claims professionals]] and [[Definition:Coverage counsel | coverage counsel]] must analyze applicable law, policy language, and the factual timeline of the loss meticulously, as small differences in trigger theory or allocation approach can dramatically alter each party's financial exposure.

🏛️ Coverage allocation disputes have generated some of the most consequential insurance litigation in the past several decades, shaping how [[Definition:Insurance carrier | carriers]] draft policy language, set [[Definition:Reserve (insurance) | reserves]], and structure [[Definition:Reinsurance | reinsurance]] recoveries. For [[Definition:Reinsurer | reinsurers]], the allocation method used at the direct level cascades upward, directly affecting which [[Definition:Treaty reinsurance | treaty years]] are impacted and how losses attach to different layers. As legacy [[Definition:Liability insurance | liability]] portfolios are increasingly transferred through [[Definition:Loss portfolio transfer (LPT) | loss portfolio transfers]] and [[Definition:Adverse development cover (ADC) | adverse development covers]], the assumptions embedded in coverage allocation analyses are critical to pricing these transactions accurately. The issue may seem technical, but it sits at the intersection of law, [[Definition:Actuarial science | actuarial science]], and corporate strategy.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Long-tail liability]]
* [[Definition:Other insurance clause]]
* [[Definition:Trigger of coverage]]
* [[Definition:Joint and several liability]]
* [[Definition:Loss portfolio transfer (LPT)]]
* [[Definition:Pro rata allocation]]
{{Div col end}}

Definition:Coverage allocation - Revision history

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