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📋 '''Policy allocation''' is the process of apportioning a loss, claim, or series of related losses across multiple [[Definition:Insurance policy | insurance policies]] that may respond to the same event or exposure, typically because the loss spans several [[Definition:Policy period | policy periods]], involves overlapping coverages, or triggers policies issued by different [[Definition:Insurance carrier | insurers]]. This issue arises most prominently in long-tail [[Definition:Liability | liability]] lines — such as [[Definition:Asbestos liability | asbestos]], [[Definition:Environmental liability | environmental contamination]], and [[Definition:Product liability | product liability]] — where bodily injury or property damage may develop over years or decades, crossing the effective dates of numerous consecutive or concurrent policies.

🔧 Allocation methodologies vary significantly by jurisdiction and have been shaped by decades of litigation. In the United States, courts have adopted competing frameworks: some follow "all sums" (or "joint and several") allocation, which allows the [[Definition:Policyholder | policyholder]] to select a single triggered policy year and recover the full loss from that year's [[Definition:Insurance carrier | carrier]], who then seeks [[Definition:Contribution | contribution]] from co-triggered insurers. Others apply "pro rata" allocation, distributing the loss proportionally across all triggered policy periods — often based on time on the risk, [[Definition:Coverage limit | limits]] available, or some hybrid formula. The distinction carries enormous financial consequences, particularly regarding whether the policyholder bears an allocable share for uninsured or self-insured periods. In [[Definition:Reinsurance | reinsurance]], allocation questions cascade further, as the [[Definition:Cedent | ceding company]] must determine how allocated losses attach to [[Definition:Treaty reinsurance | treaty]] or [[Definition:Facultative reinsurance | facultative]] placements across vintages. Courts in the United Kingdom and other common-law jurisdictions have grappled with analogous issues, with landmark decisions such as the ''Bolton MBC'' and ''Municipal Mutual'' cases shaping how allocation principles apply under English law.

💡 Getting allocation right is critical for every party in the insurance chain. For policyholders, the methodology determines how much of a long-tail loss is recoverable versus borne as [[Definition:Retention | retention]]. For primary [[Definition:Insurance carrier | insurers]], it dictates which policy years are impacted and how [[Definition:Loss reserves | loss reserves]] must be established. For [[Definition:Reinsurance | reinsurers]], downstream allocation decisions drive their own exposure calculations and can trigger disputes if the cedent's allocation approach shifts losses disproportionately into heavily reinsured years. [[Definition:Actuarial science | Actuaries]] must model allocation assumptions when setting reserves for long-tail portfolios, and [[Definition:Run-off | run-off]] specialists routinely confront allocation as one of the most complex and contentious elements of legacy [[Definition:Claims management | claims management]]. As new long-tail exposures emerge — such as [[Definition:Per- and polyfluoroalkyl substances (PFAS) | PFAS contamination]] and certain [[Definition:Cyber insurance | cyber]] liabilities — allocation frameworks developed in the asbestos era are being tested and adapted to fit novel loss patterns.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss allocation]]
* [[Definition:Long-tail liability]]
* [[Definition:Occurrence]]
* [[Definition:Trigger of coverage]]
* [[Definition:Stacking]]
* [[Definition:Contribution]]
{{Div col end}}

Definition:Policy allocation - Revision history

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