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🧮 '''Rate making''' is the actuarial and analytical discipline of determining the [[Definition:Premium | premium]] rates that an [[Definition:Insurance carrier | insurance carrier]] should charge for a given type of [[Definition:Coverage | coverage]], balancing the need to collect enough revenue to pay future [[Definition:Loss | claims]] and expenses with the competitive reality of the marketplace. Often called ratemaking or pricing, it is arguably the most consequential technical function in insurance — the foundation on which [[Definition:Underwriting | underwriting]] profitability, [[Definition:Solvency | solvency]], and market competitiveness all rest.

📐 The process begins with assembling [[Definition:Loss | loss]] and [[Definition:Loss adjustment expense (LAE) | expense]] data, typically spanning several years, then adjusting that data for [[Definition:Loss development factor | development]], [[Definition:Loss trend | trend]], and changes in the [[Definition:Exposure | exposure]] base. [[Definition:Actuary | Actuaries]] apply techniques such as the [[Definition:Loss ratio method | loss ratio method]] or the [[Definition:Pure premium method | pure premium method]] to estimate the expected cost per unit of exposure, then load for [[Definition:Underwriting expense | underwriting expenses]], [[Definition:Reinsurance | reinsurance]] costs, and a target [[Definition:Profit margin | profit provision]]. In regulated [[Definition:Personal lines | personal lines]] and workers' compensation markets, the resulting rates must be filed with state [[Definition:Insurance regulator | regulators]] and may be subject to prior approval, while [[Definition:Commercial lines | commercial lines]] and [[Definition:Surplus lines | surplus lines]] carriers often enjoy greater pricing flexibility. [[Definition:Rating bureau | Rating bureaus]] such as the [[Definition:Insurance Services Office (ISO) | ISO]] publish advisory loss costs that many insurers use as a starting point, applying their own company-specific modifications.

🎯 Getting rate making right determines whether an insurer thrives or struggles over multi-year horizons. Rates set too low attract volume but generate [[Definition:Underwriting loss | underwriting losses]] that compound as the book matures — a trap that has brought down carriers in competitive [[Definition:Soft market | soft markets]]. Rates set too high push business to competitors and leave [[Definition:Underwriting capacity | capacity]] sitting idle. Modern rate making increasingly incorporates [[Definition:Predictive analytics | predictive analytics]], [[Definition:Machine learning | machine learning]], and granular data sources to segment risks more precisely, enabling carriers to price individual accounts closer to their true expected cost. For [[Definition:Managing general agent (MGA) | MGAs]] and [[Definition:Insurtech | insurtechs]] seeking to differentiate, a proprietary edge in rate making — whether through superior data, faster model iteration, or more nuanced [[Definition:Risk segmentation | risk segmentation]] — is often the core of their value proposition to [[Definition:Reinsurer | capacity providers]].

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Rate adequacy review]]
* [[Definition:Actuarial analysis]]
* [[Definition:Loss ratio method]]
* [[Definition:Predictive analytics]]
* [[Definition:Insurance Services Office (ISO)]]
* [[Definition:Rate filing]]
{{Div col end}}

Definition:Rate making - Revision history

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