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🔄 '''Reserve true-up mechanism''' is a structured process within insurance and reinsurance transactions that reconciles estimated [[Definition:Loss reserve | loss reserves]] established at a reference date with the reserves ultimately determined to be appropriate after further [[Definition:Claims | claims]] development and [[Definition:Actuarial analysis | actuarial review]]. Where a [[Definition:Reserve adjustment clause | reserve adjustment clause]] sets out the contractual right to adjust, the true-up mechanism is the operational procedure through which that adjustment is actually calculated and settled. It is a standard feature in [[Definition:Merger and acquisition (M&A) | M&A]] agreements involving insurance companies, [[Definition:Loss portfolio transfer (LPT) | loss portfolio transfers]], and multi-year [[Definition:Reinsurance | reinsurance]] arrangements where the definitive value of liabilities cannot be known at the time the deal closes.

⚙️ The mechanism typically prescribes a timeline — for example, a review at six, twelve, or twenty-four months post-closing — during which one or both parties prepare updated reserve estimates. The contract will specify the [[Definition:Reserving methodology | reserving methodology]] and [[Definition:Accounting standards | accounting standards]] to be used, which may differ by jurisdiction: a transaction governed by U.S. statutory accounting might reference [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] guidelines, while a European deal could require compliance with [[Definition:Solvency II | Solvency II]] technical provisions or [[Definition:IFRS 17 | IFRS 17]] measurement rules. An independent [[Definition:Actuary | actuary]] is often appointed to arbitrate disagreements. Once the updated reserve figure is agreed upon, the difference from the baseline is multiplied by the applicable share or participation percentage, and a cash settlement flows from the party that benefited from the original estimate to the party that was disadvantaged. Some mechanisms include a de minimis threshold or a band of tolerance to avoid disputes over immaterial variances.

💡 For acquirers of [[Definition:Insurance carrier | insurance carriers]] or [[Definition:Run-off | run-off]] portfolios, a well-designed true-up mechanism is one of the most important protections against the risk that legacy [[Definition:Underwriting | underwriting]] was under-reserved — a risk that has historically resulted in significant post-acquisition losses in lines such as [[Definition:Liability insurance | liability]], [[Definition:Professional indemnity insurance | professional indemnity]], and [[Definition:Medical malpractice insurance | medical malpractice]]. Sellers, on the other hand, benefit because a credible true-up process can justify a higher initial purchase price by giving the buyer confidence that any shortfall will be corrected rather than absorbed silently. The mechanism also plays a role in [[Definition:Retroactive reinsurance | retroactive reinsurance]] and [[Definition:Adverse development cover (ADC) | adverse development covers]], where the triggering of additional payments depends on whether reserves develop beyond an agreed attachment point. Getting the mechanics right — including dispute resolution, data access rights, and the treatment of [[Definition:Incurred but not reported (IBNR) | IBNR]] — is a matter of careful negotiation that directly affects the economic certainty of the transaction.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Reserve adjustment clause]]
* [[Definition:Loss reserve]]
* [[Definition:Purchase price adjustment]]
* [[Definition:Adverse development cover (ADC)]]
* [[Definition:Incurred but not reported (IBNR)]]
* [[Definition:Actuarial analysis]]
{{Div col end}}

Definition:Reserve true-up mechanism - Revision history

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