Definition:Reinsurance treaty
📜 Reinsurance treaty is a standing contract between a ceding company and one or more reinsurers under which defined categories of risk are automatically ceded and accepted without the need for individual risk-by-risk approval. This distinguishes treaty business from facultative reinsurance, where each risk is separately offered and underwritten. Treaties form the backbone of most insurers' reinsurance programs, providing systematic protection across entire portfolios of policies.
🔧 Treaty structures generally fall into two broad families: proportional (or pro-rata) and non-proportional (or excess-of-loss). Under a quota-share or surplus-share arrangement, the reinsurer assumes a fixed percentage of every risk within the treaty's scope and shares premiums and losses accordingly. In an excess-of-loss treaty, the reinsurer responds only when losses breach a specified attachment point, up to an agreed limit. The contract's terms — including the ceding commission, rate-on-line, reinstatement provisions, and exclusions — are documented in a slip or contract wording negotiated with the help of a reinsurance broker. Most treaties renew annually, though multi-year deals exist where both parties seek pricing stability.
🛡️ For an insurer, a well-constructed treaty portfolio accomplishes several objectives simultaneously: it smooths earnings volatility, frees regulatory capital, and expands underwriting capacity so the company can write more business than its own balance sheet would otherwise support. From the reinsurer's perspective, treaties provide a diversified stream of premium and exposure data that informs pricing across the broader market. Because treaties bind reinsurers to accept all qualifying risks, the accuracy of the cedant's underwriting guidelines and the quality of its bordereaux reporting are critical to maintaining trust between parties — a dynamic that underpins the entire global reinsurance market.
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