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📐 '''Loss costs''' represent the portion of an [[Definition:Insurance premium | insurance premium]] attributable solely to expected [[Definition:Claim | claims]] payments and [[Definition:Loss adjustment expense | loss adjustment expenses]], before any loading for [[Definition:Underwriting expense | underwriting expenses]], profit, or [[Definition:Contingency | contingencies]]. In [[Definition:Rate making | rate making]], loss costs function as the actuarial foundation upon which final rates are built—they answer the question, "How much must we collect just to pay losses?" In many U.S. states, [[Definition:Advisory organization | advisory organizations]] such as the [[Definition:National Council on Compensation Insurance (NCCI) | NCCI]] or [[Definition:Insurance Services Office (ISO) | ISO]] publish prospective loss costs that individual [[Definition:Insurance carrier | carriers]] then modify with their own expense and profit loadings to arrive at filed rates.

🔧 Developing loss costs requires [[Definition:Actuary | actuaries]] to analyze historical [[Definition:Loss (insurance) | loss]] data, apply [[Definition:Loss development | loss development]] factors to bring immature years to [[Definition:Ultimate loss | ultimate]], adjust for [[Definition:Trend factor | trend]] (both frequency and severity), and normalize for changes in [[Definition:Exposure | exposure]] levels. The result is an estimate of future losses per unit of exposure—for example, per $100 of [[Definition:Payroll | payroll]] in [[Definition:Workers' compensation insurance | workers' compensation]] or per $1,000 of insured value in [[Definition:Property insurance | property insurance]]. Because advisory organizations file loss costs rather than final rates, each carrier retains the flexibility to apply its own [[Definition:Loss cost multiplier (LCM) | loss cost multiplier]], which accounts for company-specific expense structures, [[Definition:Reinsurance | reinsurance]] costs, target profit margins, and competitive strategy.

📊 The loss cost framework strikes a balance between regulatory transparency and market competition. Regulators can review the underlying actuarial work supporting published loss costs, ensuring that the data foundation is sound, while carriers compete on the efficiency and judgment reflected in their individual multipliers. For [[Definition:Insurtech | insurtech]] companies and newer market entrants, understanding published loss costs provides a benchmark against which proprietary [[Definition:Predictive analytics | predictive models]] can be measured. A carrier whose internal loss cost estimates consistently outperform advisory benchmarks gains a meaningful [[Definition:Underwriting | underwriting]] advantage—pricing more accurately, winning better risks, and ultimately delivering superior [[Definition:Loss ratio | loss ratios]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Rate making]]
* [[Definition:Loss cost multiplier (LCM)]]
* [[Definition:Advisory organization]]
* [[Definition:Loss development]]
* [[Definition:Trend factor]]
* [[Definition:Pure premium]]
{{Div col end}}

Definition:Loss costs - Revision history

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