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🧬 '''Longevity risk sub-module''' is a component within the [[Definition:Life underwriting risk module | life underwriting risk module]] of risk-based [[Definition:Solvency capital requirement (SCR) | solvency capital requirement]] frameworks — most notably [[Definition:Solvency II | Solvency II]] — that quantifies the capital an insurer must hold against the possibility that policyholders live longer than expected. This sub-module is central for carriers writing [[Definition:Annuity | annuities]], [[Definition:Pension insurance | pension buy-ins and buy-outs]], and other products where the insurer's obligation grows as mortality rates decline. While the terminology is most formally codified in Europe's Solvency II [[Definition:Standard formula | standard formula]], analogous calculations exist in other regimes: Singapore's RBC 2 framework, Hong Kong's risk-based capital rules, and Bermuda's [[Definition:Bermuda Monetary Authority (BMA) | BMA]] framework all require insurers to stress-test longevity assumptions.

⚙️ Under the Solvency II standard formula, the longevity risk sub-module applies a prescribed instantaneous [[Definition:Stress test | stress]] — a permanent decrease in mortality rates of 20 percent across all ages — and measures the resulting increase in [[Definition:Best estimate liability (BEL) | best estimate liabilities]]. The difference between the stressed and unstressed net asset value represents the capital charge. Insurers using an [[Definition:Internal model | internal model]] may calibrate the stress differently, often employing stochastic mortality models that capture trend risk, basis risk, and parameter uncertainty with greater granularity. The sub-module's output feeds into the broader life underwriting risk module, where it is aggregated with charges for [[Definition:Mortality risk sub-module | mortality risk]], [[Definition:Disability-morbidity risk sub-module | disability-morbidity risk]], [[Definition:Lapse risk sub-module | lapse risk]], and other life-specific exposures using a prescribed [[Definition:Correlation matrix | correlation matrix]].

📈 Demographic trends across developed economies — falling mortality rates, medical advances, and aging populations — have made the longevity risk sub-module increasingly influential in determining how much capital life insurers and [[Definition:Reinsurer | reinsurers]] must maintain. For companies with large back-books of annuities, such as those in the United Kingdom's bulk annuity market or continental European pension portfolios, this single sub-module can dominate the overall SCR. That dominance has spurred innovation in [[Definition:Longevity risk transfer | longevity risk transfer]], including [[Definition:Longevity swap | longevity swaps]] and [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] designed to offload the exposure to [[Definition:Capital markets | capital markets]] participants. Regulators continue to scrutinize the calibration of the standard stress, debating whether a flat 20 percent shock adequately captures the tail risk of sustained mortality improvement.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Life underwriting risk module]]
* [[Definition:Solvency capital requirement (SCR)]]
* [[Definition:Mortality risk sub-module]]
* [[Definition:Longevity risk transfer]]
* [[Definition:Best estimate liability (BEL)]]
* [[Definition:Internal model]]
{{Div col end}}

Definition:Longevity risk sub-module - Revision history

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