Definition:Loss ratio (L/R): Difference between revisions

📉 '''Loss ratio (L/R)''' is a fundamental measure of [[Definition:Underwriting profitability | insurance profitability]], calculated by dividing [[Definition:Incurred loss | incurred losses]] — [[Definition:Claims management | claims]] paid plus changes in [[Definition:Reserve (insurance) | reserves]] — by [[Definition:Earned premium | earned premiums]] over a given period and expressing the result as a percentage. A loss ratio of 60%, for example, means that for every dollar of [[Definition:Premium | premium]] earned, sixty cents went toward claims. [[Definition:Insurance carrier | Insurers]], [[Definition:Reinsurer | reinsurers]], and analysts track loss ratios at multiple levels — by [[Definition:Line of business | line of business]], by program, by [[Definition:Underwriting year | underwriting year]], and across the enterprise — to assess whether pricing is adequate relative to the [[Definition:Risk | risks]] being assumed.

📈 Interpreting a loss ratio requires context. A 70% ratio might be perfectly healthy for a long-tail [[Definition:Liability insurance | liability]] line with low [[Definition:Acquisition cost | acquisition costs]] but alarming for a [[Definition:Property insurance | property]] program that also carries a 35% expense load. Analysts therefore pair the loss ratio with the [[Definition:Expense ratio | expense ratio]] to produce the [[Definition:Combined ratio | combined ratio]]; a combined ratio below 100% signals an [[Definition:Underwriting profit | underwriting profit]] before [[Definition:Investment income | investment income]]. Loss ratios can also be viewed on different bases — [[Definition:Accident year | accident year]], [[Definition:Calendar year | calendar year]], or [[Definition:Policy year | policy year]] — each offering a different lens on when losses are developing and how prior-year reserves are performing.

🎯 Few metrics carry as much weight in day-to-day insurance decision-making. [[Definition:Capacity provider | Capacity providers]] use projected loss ratios to decide whether to enter or exit a program; [[Definition:Managing general agent (MGA) | MGAs]] live and die by the loss ratios of the books they manage, since deteriorating results can trigger capacity withdrawal. Regulators reference industry loss ratios when evaluating [[Definition:Rate filing | rate filings]], and investors watch them to gauge a carrier's [[Definition:Underwriting discipline | underwriting discipline]]. In [[Definition:Delegated underwriting authority (DUA) | delegated-authority]] arrangements, the loss ratio is often the single most scrutinized figure in every quarterly performance review.