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🏦 '''Insurance reserves''' are the estimated liabilities that an [[Definition:Insurance carrier | insurance carrier]] sets aside on its [[Definition:Balance sheet | balance sheet]] to cover future [[Definition:Claims | claim]] payments arising from policies already written. They represent the insurer's best projection — often validated by an independent [[Definition:Actuary | actuary]] — of what it will ultimately owe to [[Definition:Policyholder | policyholders]] and [[Definition:Claimant | claimants]], and they constitute the single largest liability on most carriers' financial statements. The two primary categories are [[Definition:Case reserve | case reserves]], established for individual reported claims, and [[Definition:Incurred but not reported (IBNR) | IBNR reserves]], which estimate losses that have occurred but have not yet been reported or fully developed.

📐 Setting reserves is both a technical and judgmental exercise. [[Definition:Actuarial science | Actuaries]] employ methods such as [[Definition:Loss development triangle | loss development triangles]], the Bornhuetter-Ferguson technique, and frequency-severity models to project ultimate [[Definition:Incurred loss | incurred losses]] by [[Definition:Accident year | accident year]] and [[Definition:Line of business | line of business]]. As claims mature and new information emerges — settlement negotiations, court rulings, medical developments — case reserves are adjusted upward or downward, and IBNR estimates are recalibrated. [[Definition:Long-tail | Long-tail]] lines like [[Definition:General liability insurance | general liability]] and [[Definition:Workers' compensation insurance | workers' compensation]] present particular challenges because claims can take a decade or more to settle, amplifying the uncertainty embedded in early reserve estimates.

⚖️ Reserve accuracy is a matter of corporate survival. Under-reserving flatters current-period [[Definition:Underwriting profitability | underwriting results]] but stores up future pain in the form of adverse [[Definition:Reserve development | reserve development]], which can erode [[Definition:Surplus | surplus]] and trigger [[Definition:Insurance rating agency | rating-agency]] downgrades or [[Definition:Regulatory action | regulatory intervention]]. Over-reserving, while more conservative, ties up [[Definition:Capital | capital]] that could be deployed for growth and may distort competitive positioning. Regulators — through bodies like the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] — require periodic [[Definition:Actuarial opinion | actuarial opinions]] on reserve adequacy, and publicly traded insurers face additional scrutiny from auditors and investors. In the [[Definition:Reinsurance | reinsurance]] market, the quality of a cedent's reserving practices directly influences how favorably [[Definition:Reinsurer | reinsurers]] price [[Definition:Treaty reinsurance | treaty]] renewals.

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

Definition:Insurance reserves - Revision history

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