Category: Claims handling · Reviewed by Amy Price, Account Executive · Last reviewed 2026-06-11
A reserve adequacy review is a systematic examination of whether the case reserves on a claim or portfolio of claims remain a fair best estimate of ultimate cost in light of current information — undertaken by handlers, technical reviewers, the actuarial function and (for material lines) external auditors.
Reserve adequacy reviews are the principal control mechanism that prevents the slow drift of under-reserving. They take three principal forms. File-level reviews are conducted by the handler at scheduled intervals (typically 90 days for active claims, more frequently for very large claims) and at every material event. Technical-level reviews are conducted by senior technical claims staff on a sampled basis. Portfolio-level reviews are conducted by the actuarial function using triangulation, benchmarking against external claim-cost inflation and stress testing against scenario losses.
The output of a reserve adequacy review is a recommendation: hold, strengthen, release, or refer for further analysis. Each recommendation is recorded on the file with reasoning. Persistent strengthening across a portfolio signals either claim inflation, optimistic earlier reserving, or process failure; persistent release signals over-prudence. Either pattern, sustained over time, requires investigation.
Reserve adequacy is at the heart of the Solvency II actuarial function’s duties. Article 48 of the Solvency II Directive (retained in UK law and reflected in the PRA Rulebook) requires the actuarial function to coordinate the calculation of technical provisions, assess the sufficiency and quality of the data, compare best estimates against experience, and inform the board of the reliability and adequacy of the calculation.
The PRA’s SS5/14 (and successor guidance) sets supervisory expectations for reserving processes including periodic reviews, governance, scenario testing and the use of multiple methods. The Actuarial Function Report — an annual document for the board and the regulator — must explicitly address adequacy.
For IFRS reporters, IFRS 17 introduces measurement requirements (fulfilment cash flows, contractual service margin, risk adjustment) that depend on the integrity of the underlying case-reserve data. Auditors review the adequacy process as part of the year-end audit. For Lloyd’s syndicates, Lloyd’s prescribes additional reserve-monitoring requirements and quarterly reserve reviews under the QMA framework.
Externally, statements of actuarial opinion (SAOs) — most prominent in US-listed groups but also relevant for some UK reporters — provide formal sign-off on reserve adequacy at year-end. The Institute and Faculty of Actuaries’ practising-certificate regime applies to actuaries giving formal opinions on UK insurance reserves.
File-level reviews are typically structured around a checklist: has the policy been re-examined; have the most recent material events been captured; has the medical, expert or counsel input been updated; is the indemnity range still reasonable; is the defence-cost trajectory still on track; are there any new aggregation or other-insurance considerations; are reinsurance recoveries booked correctly; is there any new information suggesting fraud or a change in the conduct or merits.
Technical reviews are conducted on a sampled basis by senior technical claims staff who do not handle the file day-to-day. Sample selection is typically risk-based — large claims, claims in litigation, claims with significant movement in reserve, claims past a defined ageing threshold, claims in lines under reserve scrutiny.
Portfolio reviews use actuarial methods to test whether the aggregate case reserves are converging with the line’s loss development pattern. The actuary will compare the run-off of paid claims and case reserves against historic patterns and project the ultimate. Where the projected ultimate exceeds the current case reserves plus IBNR, the actuary will recommend a strengthening at portfolio level — typically as an IBNR top-up rather than as adjustment to individual case reserves.
For litigated claims, the standard review framework requires explicit consideration of: any change in panel counsel’s view of the merits, any new disclosure, any procedural developments (such as a strike-out application or summary judgment hearing), and any change in the wider litigation environment (a recent Court of Appeal decision affecting damages awards, for example).
The cadence of reviews differs by line. Property and motor reviews are typically every 90 days for active files. Casualty and PI reviews are typically every 60 days. Major losses are reviewed monthly or more often. Run-off claims are typically reviewed annually unless there is movement.
“Triangle methods” — Chain Ladder, Bornhuetter-Ferguson, Cape Cod, Mack — generate alternative estimates of ultimate loss from claim-development triangles. The actuarial function uses several methods in parallel; significant divergence between methods signals data quality issues or unusual claim behaviour.
“Outside-in” reviews benchmark the insurer’s reserve adequacy against published industry data — for example, the Lloyd’s Market Average reserves, ABI claims development data, or PRA aggregated statistics. Significant deviation requires explanation.
“Independent reserve reviews” are commissioned periodically (typically every two to three years) from external actuarial consultancies. These reviews are seen by the audit committee, the board and the regulator. They are particularly valued for lines where the insurer has limited internal data history (a new entrant to a class) or for legacy exposures (asbestos, environmental, abuse).
A specialist solicitors PI insurer conducts its quarterly reserve adequacy review. The actuarial function uses three Chain Ladder methods (paid losses, incurred losses and Bornhuetter-Ferguson) to project ultimate cost. For the 2022 underwriting year the methods converge on an ultimate of £48m to £52m. Current case reserves plus IBNR stand at £43m. The actuary recommends a £6m strengthening of IBNR. The technical claims function performs a parallel file-level review on the 40 largest open claims (each over £400,000 case reserve) and identifies six files where case reserves should be strengthened by a combined £2.3m. The board approves both strengthenings, totalling £8.3m, and the line’s combined ratio for the year deteriorates by 4 points. The actuarial function report explains the strengthening as a combination of medical-cost inflation running ahead of underwriting assumptions and a slower-than-expected closure of two large limitation-period claims.
By Matt Bartlett, Director, on 2026-06-11. Next review: 2026-12-11.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-11. Apex Insurance Brokers Limited, FCA FRN 724952, Companies House 07014570. Not regulated advice — consult your broker on your specific position.
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