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📊 '''Loss reserves''' represent the estimated amounts an [[Definition:Insurance carrier | insurance carrier]] sets aside to cover its obligations for [[Definition:Claim | claims]] that have been reported but not yet settled, as well as those that have been [[Definition:Incurred but not reported (IBNR) | incurred but not reported]]. These reserves sit on an insurer's [[Definition:Balance sheet | balance sheet]] as liabilities and constitute one of the largest financial obligations a carrier holds at any given time. Establishing accurate loss reserves is both an [[Definition:Actuarial science | actuarial]] discipline and an accounting requirement, governed by regulatory standards that vary by jurisdiction but universally demand that insurers maintain sufficient funds to honor policyholder commitments.

⚙️ The process begins when a [[Definition:Claims adjuster | claims adjuster]] or [[Definition:Claims examiner | claims examiner]] evaluates an individual reported claim and assigns a case reserve — an estimate of the ultimate payout. Actuaries then layer on broader estimates for the portfolio, including [[Definition:Incurred but not reported (IBNR) | IBNR reserves]] calculated through methods such as chain-ladder development triangles and Bornhuetter-Ferguson techniques. These portfolio-level estimates account for claims that have already occurred but haven't yet reached the insurer, as well as anticipated development on known claims. Carriers typically review and adjust reserves quarterly, and independent [[Definition:Actuarial opinion | actuarial opinions]] are often required by [[Definition:Insurance regulator | regulators]] to validate the adequacy of posted amounts.

💡 Getting loss reserves right is arguably the single most consequential financial exercise an insurer performs. Over-reserving locks up [[Definition:Capital | capital]] that could be deployed for [[Definition:Underwriting | underwriting]] growth or investment, while under-reserving creates a dangerous illusion of profitability that can lead to [[Definition:Insolvency | insolvency]]. [[Definition:Rating agency | Rating agencies]], investors, and regulators all scrutinize reserve adequacy as a primary indicator of a carrier's financial health. In [[Definition:Long-tail line | long-tail lines]] like [[Definition:Workers' compensation insurance | workers' compensation]] and [[Definition:General liability insurance | general liability]], where claims may take years or even decades to resolve, the challenge intensifies — small errors in assumptions compound dramatically over time.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Incurred but not reported (IBNR)]]
* [[Definition:Case reserve]]
* [[Definition:Reserve development]]
* [[Definition:Loss adjustment expense (LAE)]]
* [[Definition:Actuarial science]]
* [[Definition:Loss triangle]]
{{Div col end}}

Definition:Loss reserves - Revision history

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