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🏦 '''Actuarial reserving''' is the process by which [[Definition:Actuary | actuaries]] estimate the amount of money an [[Definition:Insurance carrier | insurance carrier]] must hold to pay future [[Definition:Claim | claims]] arising from policies already in force or from losses that have already occurred but are not yet fully settled. It sits at the intersection of accounting, risk management, and regulation: the [[Definition:Reserves | reserves]] that emerge from this work appear on the carrier's [[Definition:Balance sheet | balance sheet]] as the single largest liability and are a primary focus of [[Definition:Insurance regulator | regulatory]] oversight, [[Definition:Rating agency | rating agency]] evaluation, and [[Definition:Financial examination | financial examination]].

⚙️ Actuarial reserving relies on a toolkit of quantitative methods applied to [[Definition:Loss triangle | loss triangles]] and other historical data. The [[Definition:Chain-ladder method | chain-ladder technique]] projects incomplete claims to their ultimate values using observed development patterns; the [[Definition:Bornhuetter-Ferguson method | Bornhuetter-Ferguson method]] blends actual experience with a prior expectation when data is immature; and [[Definition:Stochastic model | stochastic approaches]] generate probability distributions around the reserve estimate to quantify uncertainty. For [[Definition:Long-tail line of business | long-tail lines]] like [[Definition:General liability insurance | general liability]] or [[Definition:Workers' compensation insurance | workers' compensation]], where claims can take decades to resolve, the actuary must also model the effects of [[Definition:Inflation | inflation]], [[Definition:Litigation | litigation trends]], and legislative changes. Throughout the process, professional standards issued by the [[Definition:Actuarial Standards Board (ASB) | Actuarial Standards Board]] require documentation, disclosure of [[Definition:Actuarial assumption | assumptions]], and explicit acknowledgment of uncertainty.

💡 Accurate reserving is the linchpin of insurer [[Definition:Solvency | solvency]]. Under-reserving flatters current earnings but stores up pain for the future — when the shortfall finally surfaces, the carrier may need to post a large [[Definition:Reserve strengthening | reserve strengthening]] charge that shocks investors and draws regulatory action. Over-reserving, while more conservative, unnecessarily traps [[Definition:Capital | capital]] and can mask true [[Definition:Underwriting | underwriting]] performance, distorting management decisions. The discipline of actuarial reserving gives all stakeholders — from [[Definition:Chief financial officer (CFO) | CFOs]] to [[Definition:Reinsurance | reinsurers]] to [[Definition:Policyholder | policyholders]] — a common, defensible foundation for understanding an insurer's obligations.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss reserve]]
* [[Definition:Chain-ladder method]]
* [[Definition:Bornhuetter-Ferguson method]]
* [[Definition:Incurred but not reported (IBNR)]]
* [[Definition:Reserve strengthening]]
* [[Definition:Loss triangle]]
{{Div col end}}

Definition:Actuarial reserving - Revision history

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