Legal & Regulatory
Treaty Reinsurance
Treaty reinsurance is a blanket reinsurance arrangement where the reinsurer automatically accepts all risks within defined parameters from the cedent's book of business, without individual risk-by-risk evaluation.
Last reviewed: May 2026 · Editorial methodology
Definition
Treaty reinsurance is a reinsurance arrangement in which the cedent and reinsurer agree in advance that the reinsurer will automatically accept a defined portion of all risks within a specified class or portfolio written by the cedent, without reviewing each individual risk. Unlike facultative reinsurance—where each risk is negotiated and priced separately—treaty reinsurance covers entire portfolios on pre-agreed terms, providing the cedent with ongoing, automatic reinsurance protection and administrative efficiency. Treaties are typically structured as quota share (the reinsurer takes a fixed percentage of every risk) or excess of loss (the reinsurer pays losses above a retention amount). Treaty reinsurance agreements are usually annual contracts (though multi-year arrangements exist) and are negotiated by the insurer's reinsurance department or a reinsurance broker at each January 1 renewal cycle (the primary renewal date for the industry). Treaty negotiations set key terms including: the classes of business covered, geographic scope, coverage limits, premium cession percentages, loss participation thresholds, and applicable exclusions. The treaty reinsurance market is dominated by large professional reinsurers—Munich Re, Swiss Re, Hannover Re, Everest Re, and others—as well as Lloyd's of London syndicates. Treaty pricing is highly sensitive to recent loss experience, catastrophe model outputs, and the overall supply of global reinsurance capital.
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Cover Forge USA Editorial Team
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This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed 2026-06-14
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