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📊 '''Rate-on-line''' is a pricing metric used in [[Definition:Reinsurance | reinsurance]] that expresses the [[Definition:Reinsurance premium | reinsurance premium]] as a percentage of the [[Definition:Policy limit | limit of coverage]] provided. Calculated by dividing the premium by the limit, it gives a clean, comparable measure of how much a [[Definition:Cedent | cedent]] pays per unit of protection purchased. A rate-on-line of 10%, for example, means the buyer pays $10 million in premium for $100 million of coverage. The metric is most commonly applied to [[Definition:Excess of loss reinsurance | excess-of-loss]] contracts, particularly in [[Definition:Property catastrophe reinsurance | property catastrophe reinsurance]], where it serves as the standard language through which buyers, sellers, and [[Definition:Reinsurance broker | reinsurance brokers]] negotiate and benchmark pricing.

⚙️ During a typical [[Definition:Reinsurance renewal | renewal season]], cedents and brokers track rate-on-line movements across treaty layers to assess whether the market is hardening or softening. When catastrophe losses drive capacity out of a market — as seen after major [[Definition:Natural catastrophe | natural catastrophe]] events — rate-on-line increases reflect the repricing of risk. Conversely, an influx of [[Definition:Alternative capital | alternative capital]] from [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] or [[Definition:Catastrophe bond | catastrophe bonds]] can compress rate-on-line by expanding available capacity. The metric also forms the basis for the reciprocal calculation known as the [[Definition:Payback period | payback period]]: dividing one by the rate-on-line yields the number of years of premiums needed to fund a total loss, offering a quick intuitive sense of whether pricing is adequate relative to expected loss frequency.

💡 For [[Definition:Underwriter | underwriters]] and portfolio managers, rate-on-line is indispensable because it enables apples-to-apples comparison across layers, programs, and perils that otherwise differ dramatically in attachment points and limits. A [[Definition:Retrocession | retrocession]] buyer in London, a [[Definition:Treaty reinsurance | treaty reinsurance]] underwriter in Bermuda, and a [[Definition:Catastrophe modeler | catastrophe modeler]] in Zurich all rely on the same metric when evaluating adequacy of pricing relative to modeled [[Definition:Expected loss | expected losses]]. Rating agencies and regulators also monitor aggregate rate-on-line trends as indicators of market discipline and the sustainability of reinsurance pricing cycles. Without this standardized yardstick, the reinsurance market would lack a common vocabulary for conveying the cost of risk transfer.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Property catastrophe reinsurance]]
* [[Definition:Reinsurance premium]]
* [[Definition:Payback period]]
* [[Definition:Insurance-linked securities (ILS)]]
* [[Definition:Hard market]]
{{Div col end}}

Definition:Rate-on-line - Revision history

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