Loss reserve

~3 min read

Category: Claims · Reviewed by the Apex broking team · Last reviewed 2026-08-21

In short: A loss reserve is the amount an insurer sets aside for a claim that has happened but has not yet been fully paid. Reserves are estimates, revised as information arrives. They drive an insurer’s reported result, its regulatory capital, its reinsurance recoveries and, in the Lloyd’s market, the price at which a year of account can be closed.

Category: Claims Also known as: claims reserve, case reserve, outstanding claims reserve, technical reserve Related concepts: IBNR, technical provisions

Definition

A loss reserve is a liability recognised for claims that have occurred but have not been finally settled. It is an estimate of ultimate cost, not a payment, and it moves as the claim develops. Reserves are held gross of reinsurance, with the expected recoveries recognised separately as an asset, so that the insurer’s exposure and its protection are visible independently of each other.

Reserving is not the same as pricing. Pricing looks forward at risks not yet written; reserving looks back at losses already incurred. The two connect only indirectly, through the feedback that emerging claims experience gives to underwriting assumptions.

The components

Case reserves. Claim-by-claim estimates set by the handler on reported claims, based on the facts known about that specific loss. Where handling is delegated, these are set by the TPA or coverholder rather than the carrier, which is why reserving discipline is written into delegated authority agreements.
IBNR. A provision for claims incurred but not reported, estimated statistically rather than individually. IBNR is largest in long-tail classes such as professional indemnity and liability, where years can pass between an act and a notification.
IBNER. A provision for incurred but not enough reported — the expectation that case reserves on known claims will develop upwards as the facts emerge.
Claims handling expense. The cost of running the claims off, whether allocated to individual files or unallocated.

Reserves and regulatory capital

For accounting purposes an insurer reports reserves in its financial statements. For prudential purposes UK insurers hold technical provisions on a different basis: a best estimate of the discounted expected future cash flows, plus a risk margin. The best estimate is deliberately not prudent — the prudence sits in the risk margin and in the capital requirement above it.

The distinction matters when reading insurer disclosures, because a “reserve” in the accounts and a “technical provision” in the regulatory return are calculated differently and will not agree. Neither figure is the amount the insurer expects any individual claim to cost.

Why reserves move

Reserve movements are the most informative line in an insurer’s results. Reserves strengthen when a class develops worse than assumed — more claims than expected, higher severity, adverse legal developments, or claims inflation running ahead of the assumptions built in. They release when experience is better than assumed, and releases from prior years can flatter a current-year result that is itself unprofitable.

For a commercial buyer this is not merely of academic interest. Sustained reserve strengthening in a class is the usual precursor to hardening rates, tighter wordings and withdrawn capacity in that class, because the carrier is discovering that the business cost more than it charged.

Where reserving bites in practice

Three practical consequences are worth knowing.

Reinsurance. Recoveries depend on how a loss is reserved and allocated across years, layers and perils, and on whether reinsurers will follow the settlement eventually made.
Closing a year at Lloyd’s. The reinsurance to close premium is in substance a reserve estimate for the whole year of account, tested actuarially before the year can be closed.
Claims negotiation. An interim payment or a settlement offer is constrained by the reserve the handler has authority to release. Where a reserve has been set low and never revisited, movement can be slow for reasons that have nothing to do with the merits.

Common questions

Is a loss reserve the same as money set aside in a bank account?

No. A reserve is an accounting liability — an estimate of what the insurer expects to pay. It is supported by the insurer’s assets as a whole and by its regulatory capital, not by a segregated fund for each claim.

Can I find out what my claim is reserved at?

Reserves are internal estimates and are not routinely disclosed, partly because disclosure would affect negotiation. Your broker can sometimes gauge whether the handler has sufficient authority to move, which is often the more useful question.

What is the difference between IBNR and a case reserve?

A case reserve is an estimate for a specific reported claim. IBNR is a statistical provision for claims that have occurred but have not yet been reported to the insurer at all, so no case reserve exists for them.

Related entries

This entry is part of the Apex Insurance Wiki. Last reviewed 2026-08-21. Next review: 2027-02-21.

Apex Insurance Brokers Limited. Authorised and regulated by the Financial Conduct Authority, FRN 724952. Registered in England and Wales, Companies House 07014570. This entry provides general information about UK insurance concepts and is not regulated advice. Consult your insurance broker on your specific position.

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Related reading: Wiki: IBNR · Wiki: reinsurance to close