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📉 '''Allocation of losses''' is the method by which insurance [[Definition:Loss | losses]] are distributed among triggered [[Definition:Insurance policy | policies]], [[Definition:Policy period | policy periods]], [[Definition:Reinsurance | reinsurance]] layers, or responsible parties when a single [[Definition:Claim | claim]] or series of related claims implicates more than one source of coverage. This challenge is especially acute in long-tail [[Definition:Liability insurance | liability]] exposures — such as [[Definition:Asbestos liability | asbestos]], [[Definition:Environmental liability insurance | environmental contamination]], and [[Definition:Construction defect | construction defect]] — where the injury or damage may develop over many years, spanning numerous consecutive policies issued by different [[Definition:Insurance carrier | carriers]].

🔗 Two dominant frameworks govern how losses are allocated across triggered policies. Under the '''pro rata''' (or "time-on-the-risk") method, each triggered policy period bears a share of the total loss proportional to the time it was on risk relative to the entire exposure period, and the [[Definition:Insured | insured]] may be responsible for uninsured periods. Under the '''all sums''' (or "joint and several") method, the policyholder may select any single triggered policy to respond for the full loss, up to that policy's [[Definition:Policy limit | limits]], and the paying insurer then seeks [[Definition:Contribution | contribution]] from other triggered carriers. State law, specific policy language, and sometimes contractual agreements between insurers and policyholders determine which method applies — and the financial stakes are enormous, often involving hundreds of millions of dollars in disputed [[Definition:Loss reserve | reserves]].

⚖️ The allocation of losses also extends into the [[Definition:Reinsurance | reinsurance]] context, where a [[Definition:Ceding company | cedent]] must decide how to present multi-year or multi-occurrence losses to its treaty and [[Definition:Facultative reinsurance | facultative]] reinsurers. Different allocation choices can determine whether a loss penetrates an [[Definition:Excess of loss reinsurance | excess-of-loss]] attachment point or remains within the cedent's [[Definition:Retention | retention]]. Reinsurance contract language — including [[Definition:Loss occurrence | loss occurrence]] definitions and aggregation clauses — shapes these outcomes. For [[Definition:Actuary | actuaries]], [[Definition:Claims adjuster | claims professionals]], and financial officers, mastering loss allocation principles is essential because the methodology chosen directly impacts reported results, [[Definition:Capital | capital]] adequacy, and the resolution of complex coverage disputes.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Allocation (insurance)]]
* [[Definition:Pro rata allocation]]
* [[Definition:All sums allocation]]
* [[Definition:Long-tail liability]]
* [[Definition:Loss occurrence]]
* [[Definition:Excess of loss reinsurance]]
{{Div col end}}

Definition:Allocation of losses - Revision history

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