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📊 '''Decrement''' is an [[Definition:Actuarial science | actuarial]] term describing any cause that removes an individual from a defined population or exposure group — such as death, disability, lapse, surrender, retirement, or policy expiry. In insurance, decrements form the foundation of [[Definition:Life table | life tables]] and multi-decrement models that actuaries use to project the timing and probability of exits from an insured cohort, which in turn drives [[Definition:Premium | premium]] calculation, [[Definition:Reserve | reserving]], and product design. While a single-decrement model tracks only one cause of exit (commonly mortality), most real-world insurance applications require multiple-decrement analysis to capture competing risks simultaneously.

🔢 Multiple-decrement models assign each possible cause of exit its own set of age- or duration-specific probabilities, and these probabilities interact because an individual who exits due to one cause is no longer exposed to the others. For example, a [[Definition:Life insurance | life insurance]] actuary modeling a portfolio of [[Definition:Endowment policy | endowment policies]] must account for mortality, voluntary lapse, surrender, and maturity as separate decrements, each affecting the expected cash flows differently. The associated [[Definition:Decrement table | decrement table]] — whether constructed from company-specific experience data or industry-standard tables published by bodies like the [[Definition:Society of Actuaries (SOA) | Society of Actuaries]] in the U.S. or the [[Definition:Institute and Faculty of Actuaries | Institute and Faculty of Actuaries]] in the UK — translates these probabilities into projected survivor counts at each future duration. Under [[Definition:IFRS 17 | IFRS 17]], the accuracy of decrement assumptions directly affects the measurement of the [[Definition:Contractual service margin (CSM) | contractual service margin]] and the pattern of profit recognition.

⚙️ Getting decrement assumptions right is one of the most consequential tasks in insurance pricing and valuation. Underestimating lapse rates on a [[Definition:Universal life insurance | universal life]] block, for instance, can leave an insurer holding unprofitable policies far longer than expected, while overestimating mortality in a [[Definition:Pension | pension]] or [[Definition:Annuity | annuity]] portfolio can lead to severe [[Definition:Longevity risk | longevity risk]] exposure. Regulators across jurisdictions require insurers to demonstrate that their decrement assumptions are supported by credible experience studies and are updated periodically. As data analytics and [[Definition:Predictive modeling | predictive modeling]] capabilities advance, insurers are increasingly able to segment decrement rates by granular risk factors, improving the precision of their projections and strengthening both pricing adequacy and competitive positioning.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Life table]]
* [[Definition:Mortality rate]]
* [[Definition:Lapse rate]]
* [[Definition:Actuarial assumption]]
* [[Definition:Survival model]]
* [[Definition:IFRS 17]]
{{Div col end}}

Definition:Decrement - Revision history

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