PlumBot: Bot: Creating definition

2026-03-31T17:21:50Z

Bot: Creating definition

New page

🤝 '''Proportionate reinsurance''' — also called pro rata reinsurance — is a form of [[Definition:Reinsurance|reinsurance]] in which the [[Definition:Ceding company|ceding company]] and the [[Definition:Reinsurer|reinsurer]] share [[Definition:Premium|premiums]] and [[Definition:Claims|claims]] according to a pre-agreed percentage or proportional allocation. The two principal structures are [[Definition:Quota share|quota share]], where a fixed percentage of every risk in a defined [[Definition:Portfolio|portfolio]] is ceded, and [[Definition:Surplus treaty|surplus treaty]], where the cession varies by risk depending on the ceding company's chosen [[Definition:Retention|retention]] line relative to the sum insured. This category of reinsurance is foundational to the global market and has been practiced since the earliest days of treaty reinsurance, long before the development of [[Definition:Non-proportionate reinsurance|non-proportionate]] (excess of loss) alternatives.

⚙️ The mechanics hinge on a straightforward principle: if a reinsurer takes 40 percent of a quota share treaty, it receives 40 percent of the original [[Definition:Gross written premium|gross written premium]] (net of a [[Definition:Ceding commission|ceding commission]] returned to the cedent to cover acquisition and administrative costs) and pays 40 percent of every claim. Surplus treaties add a layer of complexity because the ceded proportion changes from one risk to the next; the cedent retains a fixed monetary amount per risk and cedes the remainder up to a defined multiple of that retention. In both structures, the reinsurer effectively steps into the shoes of the [[Definition:Primary insurer|primary insurer]] for its share, participating in the same [[Definition:Loss ratio|loss experience]] from the first dollar. Proportionate treaties commonly include [[Definition:Profit commission|profit commission]] clauses that reward the cedent when the treaty's results are favorable, aligning incentives between the parties.

🌍 The enduring appeal of proportionate reinsurance lies in its versatility. For smaller or newer insurers, a quota share can provide [[Definition:Surplus relief|surplus relief]] — improving [[Definition:Solvency ratio|solvency ratios]] by reducing net retained liabilities — while simultaneously giving access to the reinsurer's [[Definition:Underwriting|underwriting]] expertise through review of ceded business. In markets governed by [[Definition:Solvency II|Solvency II]], [[Definition:C-ROSS|C-ROSS]], or the [[Definition:Risk-based capital|risk-based capital]] framework in the United States, proportionate treaties can meaningfully reduce required capital because the risk transfer is direct and proportional. Surplus treaties are particularly popular in property and marine lines, where individual risk sizes vary widely and the cedent wants to limit its exposure on large accounts without giving away a blanket share of the entire book. Across all geographies, proportionate reinsurance remains one of the most widely used tools for capacity management, earnings stabilization, and portfolio shaping.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Quota share]]
* [[Definition:Surplus treaty]]
* [[Definition:Non-proportionate reinsurance]]
* [[Definition:Ceding commission]]
* [[Definition:Retention]]
* [[Definition:Treaty reinsurance]]
{{Div col end}}

Definition:Proportionate reinsurance - Revision history

PlumBot: Bot: Creating definition