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📊 '''Loss reserving''' is the actuarial and financial process through which [[Definition:Insurance carrier | insurers]] and [[Definition:Reinsurer | reinsurers]] estimate the ultimate cost of [[Definition:Claim | claims]] arising from policies they have written, and record those estimates as [[Definition:Loss reserve | loss reserves]] on their balance sheets. Unlike a one-time calculation, loss reserving is a continuous discipline — estimates are revisited each reporting period as new claim data emerges, legal environments shift, and economic conditions evolve. The practice sits at the intersection of [[Definition:Actuarial science | actuarial science]], [[Definition:Claims management | claims management]], and corporate finance, and its outputs ripple through every major financial metric an insurer reports.

🔧 Practitioners rely on a toolkit of quantitative techniques, each suited to different lines of business and data conditions. Short-tail coverages like [[Definition:Property insurance | property insurance]] may lend themselves to straightforward [[Definition:Expected loss ratio | expected-loss-ratio]] methods, while long-tail lines such as [[Definition:Professional liability insurance | professional liability]] or [[Definition:Asbestos and environmental (A&E) liability | asbestos liability]] often require stochastic models, [[Definition:Loss triangle | loss development triangles]], and scenario analysis. Modern [[Definition:Insurtech | insurtech]] tools increasingly supplement traditional approaches with [[Definition:Machine learning (ML) | machine learning]] algorithms that can detect patterns in granular claim-level data, improving both speed and granularity. Regardless of technique, the output feeds into published financial statements, [[Definition:Statutory accounting | statutory filings]], and [[Definition:Reinsurance | reinsurance]] negotiations.

🎯 Getting loss reserving right is arguably the single most important determinant of an insurer's long-term financial health. A disciplined reserving process allows management to price products accurately, allocate [[Definition:Capital | capital]] efficiently, and communicate credibly with [[Definition:Rating agency | rating agencies]] and [[Definition:Insurance regulator | regulators]]. Conversely, flawed reserving — whether from inadequate data, inappropriate methods, or managerial pressure — has been at the root of some of the industry's most prominent insolvencies. Because of these stakes, external [[Definition:Actuarial opinion | actuarial opinions]] on reserves are required in many jurisdictions, and [[Definition:Audit | auditors]] devote significant attention to evaluating the reasonableness of an insurer's reserving assumptions.

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

Definition:Loss reserving - Revision history

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