Category: Claims handling · Reviewed by Matt Bartlett, Director · Founder · Last reviewed 2026-06-11
Case reserves are the claim-specific estimates of ultimate cost (indemnity and defence) set by the claims handler on each reported claim file as a best estimate at a given point in time.
Case reserves are the bottom-up, file-by-file element of an insurer’s overall claims provisions. They are set by the handler, reviewed by technical reviewers, and tested by the actuarial function against portfolio-level triangulation. Every active claim file carries a case reserve. The reserve is split between indemnity (what the insurer expects to pay) and ALAE (allocated loss adjustment expenses — defence costs and other claim-specific external costs).
Case reserving discipline is one of the most important controllable elements of claims operations. Insurers that case-reserve well — promptly, accurately, transparently — tend to have smoother financial reporting, fewer surprises at year-end, more predictable underwriting performance and a better relationship with reinsurers. Insurers that case-reserve poorly are exposed to sudden large reserve strengthenings, supervisory concerns and reputational damage.
At the regulatory level, case reserves contribute to the Solvency II technical provisions through the bottom-up component. The PRA SS5/14 and the Solvency II actuarial function (Article 48 of the Directive, retained in UK law) require the actuarial function to assess data quality including case reserving discipline.
At the file level, case reserves are subject to the claims operating standards set internally by the insurer and externally by professional bodies. The Chartered Insurance Institute and the Chartered Institute of Loss Adjusters both promulgate good-practice standards for case reserving. For Lloyd’s syndicates, Lloyd’s Claims Minimum Standards include reserving standards as part of claims oversight.
Under IFRS 17, case reserves contribute to the fulfilment cash flows underpinning the measurement of insurance contract liabilities. Auditors test case-reserve discipline as part of substantive procedures at year-end.
Case reserves are set at FNOL and revised at every material event. The initial reserve is a placeholder based on the line’s historic average for similar claims. The first substantive revision typically follows the initial investigation — within 14 to 30 days for property, 6 to 12 weeks for casualty and PI. Thereafter the reserve is reviewed at handler-set intervals and at every defined trigger event.
The reserve is composed of best-estimate indemnity and best-estimate ALAE. For litigated claims it is increasingly common to set the reserve on an expected-value basis — assigning probabilities to different settlement and trial scenarios and combining them. For example, a PI claim with a 70% chance of settling at £600,000, a 20% chance of trial loss at £1.2m and a 10% chance of dismissal at zero would carry an expected-value indemnity reserve of (0.70 × £600,000) + (0.20 × £1.2m) + (0.10 × 0) = £660,000.
Reserves are tracked in the CMS with full audit history. Every change is timestamped, attributed and reasoned. Reserve “movement” — strengthening or release — is a KPI for the line. Persistent movement in one direction signals that initial reserving is too low or too high.
Reserves are also tracked for individual handlers as a quality metric. A handler whose claims close at materially different values to their case reserves needs supervision; the direction of error matters less than its consistency.
For very large claims, case reserves may be set under a structured methodology requiring sign-off from senior claims management. Many insurers use defined thresholds — anything above £500,000 requires technical sign-off, anything above £2m requires the head of claims, anything above £5m requires the chief underwriting officer.
“Open” or “placeholder” reserves are minimal amounts (often £1 or £100) used to open files for claims of unknown value while substantive investigation proceeds.
“Indemnity-only” reserves apply where defence costs are tracked separately, common in PI and D&O business with separate defence cost lines.
“Co-insured” reserves apply where multiple insurers share a claim; each insurer’s case reserve reflects its share of the consolidated reserve.
“Reinsured” or “net” case reserves are the gross case reserve less the reinsurance recoveries expected on that specific claim. Net reserves are tracked separately from gross because they drive the insurer’s net underwriting result.
“Provisional” reserves are placeholders pending an event — typically a coverage decision, a counsel’s opinion or a judgment. Provisional reserves carry a flag and a target date for resolution.
A claims handler in a UK casualty team takes a serious injury FNOL on Monday 4 May 2026. Initial case reserve at FNOL: £150,000 (the line’s historic average for similar reported events). Initial investigation by the panel solicitor and counsel’s preliminary view on liability arrive at week 10. Liability admitted with contributory negligence at 25%. Medical evidence from week 18 shows persistent disabling injury. Counsel’s preliminary damages range £620,000 to £900,000 net of contributory negligence. Defence costs to trial estimated £180,000. The handler revises the reserve at week 20 to £760,000 indemnity (mid-point of counsel’s range) and £140,000 ALAE — total £900,000. After a successful joint settlement meeting at week 76 the claim settles at £710,000 plus £125,000 of costs, releasing £65,000 of reserve. The actuarial function records the movement, examines it alongside other recent settlements on the line, and notes consistent slight over-reservation that is mildly reducing the IBNR top-up at the next quarter-end.
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.
Apex Insurance Brokers serves UK professional services firms and commercial businesses. Call 0117 325 0027, email hello@apexinsurancebrokers.co.uk, or request a quotation.
Get a quote