Case Reserve
Also known as: case reserves, claim reserve, adjuster reserve
A case reserve is the estimated future cost an adjuster assigns to an individual open claim after reviewing its facts — the injury or damage severity, medical or repair estimates, wage loss, and litigation posture. Unlike IBNR, which is an aggregate actuarial provision for claims not yet individually identified, a case reserve is claim-specific: one number for one file. Together, paid amounts plus case reserves plus IBNR make up an insurer's total incurred losses for a period.
Case reserves matter to a small-business buyer because they hit your record the moment a claim is set up, long before any settlement. Every open claim's case reserve flows onto your loss run as incurred loss, and in workers' comp it feeds the experience modifier that adjusts your premium for three years. An over-conservative reserve on a claim that ultimately settles cheaply can inflate your loss ratio and cost you real money at renewal, so many businesses actively monitor open reserves and ask adjusters to justify large ones.
A practical nuance: case reserves are living estimates that move through loss development. Adjusters raise them when new information (surgery, attorney involvement, permanent disability) appears and lower them as risk resolves; when the claim finally closes, the reserve drops to zero and the paid amount reflects the true cost. Because reserves are judgment calls, they can be too high or too low — a pattern of insufficient case reserves across a carrier's book signals reserve deficiency, while stale, un-reduced reserves on effectively finished claims are worth challenging. If you spot an open claim on your loss run that should be closed, request a reserve review before your mod-year valuation date.
Real-world scenario
Sierra Framing LLC, a 22-employee wood-framing contractor in Sacramento, carries a workers' compensation policy with an annual premium of $48,000 built on $1,900,000 of payroll. In March, a framer falls from a second-story deck and fractures his pelvis. Within 48 hours the carrier's adjuster opens the file, and after the first medical report estimates $85,000 in surgery and hospitalization plus $60,000 in temporary and permanent disability wage benefits — setting an initial case reserve of $145,000 on this single claim.
Three months later, an infection requires a second surgery. The adjuster revises the medical piece up by $40,000 and adds $10,000 of loss adjustment expense for a nurse case manager and defense review, pushing the case reserve to $195,000. Because $2,000 has already been paid to the hospital and $8,000 in wage checks issued, the carrier now shows $10,000 paid plus a $195,000 reserve — a $205,000 incurred loss on the file. The claim eventually settles, and once all payments are made the file closes at $175,000 of total incurred cost — releasing the $30,000 of over-reserve back.
The damage isn't only the payout. That incurred figure flows into Sierra's three-year experience modifier, lifting its mod from 0.94 to roughly 1.28. Applied to a $48,000 manual premium, the higher mod adds about $16,300 a year for three years — nearly $49,000 of extra cost driven largely by how that case reserve was valued.
How it affects your premium
A case reserve isn't priced like a product — it's an adjuster's estimate of one open claim's future cost. But how reserves are set and how quickly they change directly affects the premiums a business ultimately pays, because reserved dollars feed experience rating and loss ratios. Key drivers of how large a case reserve gets:
- Injury or damage severity — A soft-tissue strain may reserve at $3,000, while a spinal surgery or amputation can reserve at $250,000 or more the moment the diagnosis lands.
- Medical inflation and treatment duration — Long-tail claims with surgeries, physical therapy, and prescriptions force adjusters to reserve for years of future care, not just bills paid to date.
- Indemnity/wage exposure — A high-wage worker off the job for months drives large disability benefit reserves on top of medical.
- Litigation and defense costs — Once attorneys appear, adjusters add loss adjustment expense reserves for legal fees, experts, and depositions.
- Jurisdiction and venue — State benefit schedules and "nuclear verdict" venues push reserves higher for identical injuries.
- Adjuster philosophy and reserve adequacy — Conservative carriers reserve to probable ultimate value early; others reserve low and develop upward, which changes how a claim looks at renewal.
- Development over time — As facts emerge, reserves are restated up or down, so the case reserve on a loss run is a snapshot, not a final number.
Common misconceptions
Myth: The case reserve is the amount the insurer will actually pay on my claim.
Reality: It is only an estimate of the probable future cost, revised as facts change; the eventual ultimate loss is often higher or lower, and any over-reserve is released once the claim closes.
Myth: Only claims that have been paid out affect my premium.
Reality: Open reserves count too. The reserved portion is part of your incurred losses, so a large reserve on an unresolved claim can raise your experience mod at renewal even before a single dollar is paid.
Myth: Case reserves cover every dollar the insurer expects to owe on all claims.
Reality: Case reserves cover only known, reported claims. Insurers hold a separate IBNR reserve for incidents that have happened but haven't been reported yet.
Frequently asked questions
Who sets the case reserve on my claim?
Can I dispute a case reserve I think is too high?
What happens to the reserve when the claim closes?
How is a case reserve different from IBNR?
Does a big case reserve hurt me even if the claim settles for less?
Sources cited
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