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📊 '''Incurred but not reported analysis (IBNR analysis)''' is the actuarial process of estimating the value of insurance claims that have already occurred but have not yet been reported to the [[Definition:Insurance carrier | carrier]]. Every insurer carries a population of latent claims — events that took place before the reporting date but remain invisible because policyholders have not yet filed notice, or because the loss has not yet been discovered. IBNR analysis applies statistical and actuarial techniques to quantify these hidden liabilities, producing an estimate that feeds directly into the [[Definition:Loss reserve | loss reserves]] recorded on an insurer's balance sheet. The practice is fundamental across all major insurance markets, though the specific methodologies, regulatory expectations, and disclosure requirements differ under frameworks such as [[Definition:US GAAP | US GAAP]], [[Definition:IFRS 17 | IFRS 17]], [[Definition:Solvency II | Solvency II]], and China's [[Definition:C-ROSS | C-ROSS]].

⚙️ Actuaries performing IBNR analysis draw on a toolkit of well-established methods — [[Definition:Chain-ladder method | chain-ladder]], [[Definition:Bornhuetter-Ferguson method | Bornhuetter-Ferguson]], frequency-severity models, and Cape Cod approaches among them — often blending several to triangulate a best estimate. The analysis begins with organizing historical claims data into [[Definition:Loss development triangle | loss development triangles]], which track how reported and paid losses evolve over successive periods. By studying these patterns, actuaries project the remaining development on known claims and estimate the volume of claims not yet in the system. Long-tail lines such as [[Definition:General liability insurance | general liability]], [[Definition:Workers' compensation insurance | workers' compensation]], and [[Definition:Medical malpractice insurance | medical malpractice]] demand especially careful IBNR analysis because losses may emerge years or even decades after the policy period. Shorter-tail lines like [[Definition:Property insurance | property]] or [[Definition:Motor insurance | motor]] physical damage still require IBNR estimation, though the uncertainty window is narrower.

💡 Accurate IBNR analysis is the linchpin of financial credibility for any insurance organization. Understating IBNR leads to reserve deficiencies that can erode [[Definition:Surplus | surplus]], trigger regulatory intervention, and surprise investors with adverse [[Definition:Reserve development | reserve development]]. Overstating it unnecessarily ties up capital that could otherwise support growth or be returned to shareholders. During [[Definition:Mergers and acquisitions (M&A) | M&A]] transactions, acquirers scrutinize the target's IBNR methodology as part of [[Definition:Actuarial due diligence | actuarial due diligence]], since any misjudgment flows directly into the purchase price and post-closing exposure. Regulators worldwide — from the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] in the United States to the [[Definition:Prudential Regulation Authority (PRA) | PRA]] in the United Kingdom and the [[Definition:Monetary Authority of Singapore (MAS) | MAS]] in Singapore — require that insurers maintain adequate IBNR provisions and, in many cases, that an [[Definition:Independent actuarial opinion | independent actuarial opinion]] confirm their reasonableness.

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

Definition:Incurred but not reported analysis (IBNR analysis) - Revision history

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