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📊 '''Incurred loss ratio''' is a fundamental [[Definition:Loss ratio | loss ratio]] metric that measures [[Definition:Incurred losses | incurred losses]] as a percentage of [[Definition:Earned premium | earned premiums]] over a given period. Unlike a [[Definition:Paid loss ratio | paid loss ratio]], which only accounts for claims that have already been settled, the incurred loss ratio captures the full economic cost of claims by including both paid amounts and outstanding [[Definition:Loss reserve | loss reserves]] — encompassing [[Definition:Case reserve | case reserves]] and [[Definition:Incurred but not reported (IBNR) | IBNR]] estimates. This makes it a more complete and timely indicator of [[Definition:Underwriting | underwriting]] performance across all lines of business and geographies.

⚙️ The calculation takes total incurred losses — comprising claims paid during the period plus the net change in outstanding reserves — and divides that figure by earned premiums for the same period. Because reserve estimates are inherently judgmental, the incurred loss ratio can shift materially as [[Definition:Actuarial analysis | actuarial]] assumptions are revised, claims develop, or [[Definition:Reserve development | reserve development]] (whether adverse or favorable) is recognized. Under [[Definition:International financial reporting standard 17 (IFRS 17) | IFRS 17]], the treatment of insurance service expenses and the [[Definition:Contractual service margin (CSM) | contractual service margin]] introduces additional nuance to how losses are recognized, while under [[Definition:US GAAP | US GAAP]] the traditional incurred-cost model continues to apply more directly. Analysts comparing loss ratios across jurisdictions must therefore account for differences in reserving philosophies, [[Definition:Discount rate | discounting]] practices, and regulatory reporting requirements — such as those under [[Definition:Solvency II | Solvency II]] in Europe or the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] framework in the United States.

💡 For [[Definition:Insurance carrier | carriers]], [[Definition:Reinsurer | reinsurers]], and [[Definition:Managing general agent (MGA) | MGAs]] alike, the incurred loss ratio sits at the heart of performance evaluation. It drives decisions on [[Definition:Rate adequacy | rate adequacy]], [[Definition:Underwriting guideline | underwriting guideline]] adjustments, and [[Definition:Reinsurance | reinsurance]] purchasing strategies. A rising incurred loss ratio may signal deteriorating risk selection, inadequate [[Definition:Premium | pricing]], or unexpected [[Definition:Claims inflation | claims inflation]], while a declining ratio could reflect improved underwriting discipline or favorable reserve releases. Investors and [[Definition:Insurance company rating | rating agencies]] scrutinize this metric when assessing an insurer's financial health, making it one of the most closely watched indicators in the industry.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Loss ratio]]
* [[Definition:Combined ratio]]
* [[Definition:Earned premium]]
* [[Definition:Incurred but not reported (IBNR)]]
* [[Definition:Reserve development]]
* [[Definition:Paid loss ratio]]
{{Div col end}}

Definition:Incurred loss ratio - Revision history

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