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📂 '''Cohort''' in the insurance context refers to a grouping of [[Definition:Insurance contract | insurance contracts]] that share common characteristics — most critically, a common period of inception — for the purposes of measurement, reporting, and performance analysis. The term has gained particular prominence under [[Definition:IFRS 17 | IFRS 17]], where it carries a precise technical meaning: insurers must group contracts into annual cohorts (contracts issued no more than one year apart) and further subdivide them by profitability, separating [[Definition:Onerous contract | onerous contracts]], contracts with no significant possibility of becoming onerous, and remaining contracts. Beyond IFRS 17, the concept of cohort-based analysis has long been used in [[Definition:Actuarial analysis | actuarial work]], [[Definition:Underwriting | underwriting]] management, and [[Definition:Reserving | reserving]] to track how a defined group of policies performs over time.

⚙️ Under IFRS 17, the annual cohort requirement means that an insurer cannot lump together contracts written in different years into a single measurement group, even if those contracts are otherwise identical in risk profile. Each cohort is measured using the [[Definition:Building block approach (BBA) | building block approach]] or the [[Definition:Premium allocation approach (PAA) | premium allocation approach]], with its own [[Definition:Contractual service margin (CSM) | contractual service margin]] that is released into profit over the [[Definition:Coverage period | coverage period]]. This prevents profitable older vintages from masking losses in newer ones, enforcing a discipline of vintage-level transparency. The requirement proved controversial during the standard's development, especially among life insurers and mutual companies in Europe and Asia who argued that it conflicted with the intergenerational pooling central to their business models. Some jurisdictions, including the European Union, considered modifications to ease the annual cohort constraint for certain long-duration or mutualized products.

🔍 For practitioners beyond the accounting department, cohort-based thinking provides a powerful analytical lens. [[Definition:Actuarial analysis | Actuaries]] use cohort or [[Definition:Accident year | accident-year]] groupings to construct [[Definition:Loss development triangle | loss development triangles]], track [[Definition:Loss ratio | loss ratios]] by underwriting year, and detect shifts in claims emergence patterns. [[Definition:Managing general agent (MGA) | MGAs]] and [[Definition:Delegated underwriting authority (DUA) | delegated authority]] operations often report performance to their [[Definition:Insurance carrier | capacity providers]] on a cohort basis, allowing carriers to see whether each year's [[Definition:Binding authority agreement | binder]] is generating acceptable returns before deciding to renew. In this broader sense, the cohort concept embodies a principle of accountability: by isolating performance to a defined group of contracts in a defined period, insurers can make better pricing, reserving, and strategic decisions rather than relying on blended averages that obscure underlying trends.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:IFRS 17]]
* [[Definition:Contractual service margin (CSM)]]
* [[Definition:Onerous contract]]
* [[Definition:Accident year]]
* [[Definition:Loss development triangle]]
* [[Definition:Building block approach (BBA)]]
{{Div col end}}

Definition:Cohort - Revision history

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