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📅 '''Policy year''' refers to the twelve-month period beginning on the effective date of an [[Definition:Insurance policy | insurance policy]] or, in a broader sense, the annual accounting period used to group all policies incepting within a given calendar or underwriting year. In insurance accounting and [[Definition:Reserving | reserving]], the policy year is a fundamental organizing principle: [[Definition:Loss | losses]], [[Definition:Premium | premiums]], and [[Definition:Expense | expenses]] are attributed to the year in which the underlying policy was written, regardless of when claims are actually reported or paid. This distinction matters because a single policy year's results may take years to fully develop, especially in [[Definition:Long-tail insurance | long-tail lines]] such as [[Definition:Liability insurance | liability]] or [[Definition:Workers' compensation insurance | workers' compensation]].

⚙️ When an [[Definition:Insurance carrier | insurer]] or [[Definition:Lloyd's syndicate | Lloyd's syndicate]] tracks experience on a policy-year basis, every [[Definition:Claim | claim]] arising from policies incepting in that year is allocated back to it — even if the claim surfaces five or ten years later. This approach contrasts with [[Definition:Calendar year | calendar-year]] or [[Definition:Accident year | accident-year]] accounting, each of which slices the data differently. Policy-year analysis gives [[Definition:Actuary | actuaries]] and [[Definition:Underwriting | underwriters]] the cleanest view of how a particular book of business is performing, because it ties premiums and losses to the same cohort of policies. [[Definition:Reinsurance | Reinsurers]] frequently structure [[Definition:Treaty reinsurance | treaties]] on a policy-year basis, meaning coverage attaches to all policies incepting during the specified period.

📊 A clear grasp of policy-year dynamics is essential for accurate [[Definition:Loss development | loss development]] analysis and [[Definition:Pricing | pricing]] decisions. Because losses attributed to a policy year continue to emerge long after the year closes, [[Definition:Reserve | reserves]] must be updated as new information arrives, and early-year [[Definition:Loss ratio (L/R) | loss ratios]] are inherently provisional. Misinterpreting immature policy-year data can lead to under-reserving or mispriced [[Definition:Renewal | renewals]]. For regulators, investors, and [[Definition:Rating agency | rating agencies]], policy-year results offer a powerful lens into an insurer's true underwriting profitability — one that strips away the timing distortions present in calendar-year financials.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Accident year]]
* [[Definition:Calendar year]]
* [[Definition:Underwriting year]]
* [[Definition:Loss development]]
* [[Definition:Earned premium]]
* [[Definition:Reserving]]
{{Div col end}}

Definition:Policy year - Revision history

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