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📐 '''Premium rating''' is the systematic methodology used to assign a specific [[Definition:Premium | premium]] amount to an individual risk or policy based on its particular characteristics, applying the broader [[Definition:Premium rate setting | rate structure]] established by an [[Definition:Insurance carrier | insurer]] to the facts of each case. While rate setting establishes the general pricing framework — base rates, classification factors, and loading structures — rating is the application layer where those components are combined with risk-specific variables such as [[Definition:Sum insured | sum insured]], [[Definition:Deductible | deductible]] level, geographic location, [[Definition:Loss history | claims history]], and occupation or industry classification to produce the final quoted premium. The distinction matters: an insurer may have sound rates at the aggregate level yet still misprice individual accounts if its rating methodology fails to differentiate adequately among heterogeneous risks within a class.

⚙️ Rating approaches differ by line of business and market convention. In personal lines — motor, homeowners, and small commercial — [[Definition:Rating algorithm | rating algorithms]] apply predetermined factors to each variable in a multiplicative or additive structure, producing a premium with minimal human intervention. Sophisticated carriers deploy [[Definition:Generalized linear model (GLM) | generalized linear models]] and increasingly [[Definition:Machine learning | machine learning]]-based models to refine factor selection and capture non-linear relationships among rating variables. In larger commercial and specialty placements, rating retains a significant element of [[Definition:Underwriter | underwriter]] judgment: an underwriter may start from a technical rate derived from [[Definition:Exposure rating | exposure rating]], [[Definition:Experience rating | experience rating]], or [[Definition:Burning cost | burning cost]] analysis and then adjust it based on qualitative factors such as management quality, [[Definition:Risk management | risk management]] sophistication, or market conditions. [[Definition:Lloyd's of London | Lloyd's]] and the London market are particularly known for this blend of technical and judgment-based rating, where [[Definition:Broker | brokers]] negotiate terms face-to-face with underwriters and the final premium reflects a dynamic interplay of data and market intelligence.

🎯 Accuracy in premium rating directly affects an insurer's competitive position and financial health. Over-rating — charging too much relative to the risk — drives away desirable accounts and hands [[Definition:Market share | market share]] to competitors, while under-rating attracts adverse selection and inflates the [[Definition:Loss ratio | loss ratio]]. [[Definition:Regulatory | Regulators]] in many jurisdictions require that rating practices be actuarially justified and not unfairly discriminatory, a standard that has gained urgency as [[Definition:Algorithmic underwriting | algorithmic rating models]] grow more complex and potentially opaque. The [[Definition:Insurtech | insurtech]] wave has brought new capabilities to the rating function — real-time data integration, parametric triggers, and continuous risk monitoring that allow dynamic premium adjustments — but it has also intensified scrutiny over model governance and explainability. For insurance professionals, mastering the mechanics and strategic implications of premium rating is foundational, as it connects actuarial science, underwriting strategy, [[Definition:Distribution | distribution]] economics, and regulatory compliance in a single discipline.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Premium rate setting]]
* [[Definition:Experience rating]]
* [[Definition:Exposure rating]]
* [[Definition:Generalized linear model (GLM)]]
* [[Definition:Underwriting]]
* [[Definition:Rating algorithm]]
{{Div col end}}

Definition:Premium rating - Revision history

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