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🔄 '''Loss reserve true-up''' is the process of adjusting previously established [[Definition:Loss reserve | loss reserves]] to reflect actual claims experience, updated actuarial estimates, or revised assumptions about future claim payments. In insurance, where reserves are inherently forward-looking estimates set at a point in time, the true-up represents the moment when reality is reconciled against prior projections — resulting in either favorable development (reserves prove more than sufficient) or adverse development (reserves fall short). This adjustment process occurs routinely as part of an insurer's ongoing [[Definition:Reserving methodology | reserving]] cycle, but it also plays a central role in [[Definition:Mergers and acquisitions (M&A) | M&A]] transactions and [[Definition:Reinsurance | reinsurance]] contract settlements where the parties have agreed to reconcile estimated figures against actual outcomes.

⚙️ In practice, a loss reserve true-up can take several forms depending on the context. Internally, an [[Definition:Insurance carrier | insurer]] performs periodic reserve reviews — often quarterly — where its [[Definition:Actuarial function | actuarial team]] re-evaluates open claims, analyzes new [[Definition:Loss development | loss development]] data, and recalibrates assumptions about [[Definition:Claim settlement | settlement]] patterns, [[Definition:Claim inflation | inflation]], and legal costs. The resulting adjustments flow through the income statement, either boosting or depressing reported [[Definition:Underwriting profit | underwriting profit]]. In transactional settings, a true-up provision in the [[Definition:Share purchase agreement (SPA) | share purchase agreement]] may specify that the purchase price will be adjusted — upward or downward — once sufficient claim maturity has been reached after closing. Some deals use an [[Definition:Escrow | escrow]] mechanism to hold back a portion of the purchase price pending the true-up calculation, with the escrowed amount released based on a subsequent [[Definition:Loss reserve analysis | actuarial assessment]].

📉 The stakes involved in a reserve true-up can be substantial. A single long-tail line of business, such as [[Definition:Casualty insurance | casualty]], [[Definition:Professional liability insurance | professional liability]], or [[Definition:Asbestos and environmental liability | asbestos and environmental]], may develop over decades, and even modest percentage adjustments to reserves can translate into hundreds of millions of dollars in gains or charges. For publicly traded insurers reporting under [[Definition:US GAAP | US GAAP]] or [[Definition:IFRS 17 | IFRS 17]], prior-year reserve development is closely scrutinized by analysts and regulators alike as a signal of reserving discipline. In the [[Definition:Lloyd's of London | Lloyd's]] market, [[Definition:Syndicate | syndicates]] undergo regular [[Definition:Actuarial opinion | actuarial opinions]] that effectively serve as true-up mechanisms when years of account are closed or [[Definition:Reinsurance to close (RITC) | reinsured to close]]. Across all these contexts, the true-up ensures that financial statements and deal economics ultimately reflect the real cost of insurance promises rather than outdated projections.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss reserve]]
* [[Definition:Loss reserve analysis]]
* [[Definition:Loss development]]
* [[Definition:Prior-year reserve development]]
* [[Definition:Completion accounts]]
* [[Definition:Escrow]]
{{Div col end}}

Definition:Loss reserve true-up - Revision history

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