Reinsurance Treaty
An automatic reinsurance agreement where the reinsurer agrees in advance to accept all risks that fall within defined parameters, without individual risk assessment.
What It Is
A reinsurance treaty is a standing agreement between a primary insurer (ceding company) and a reinsurer that automatically transfers a defined share of risks or losses from the ceding company to the reinsurer. Unlike facultative reinsurance where each risk is individually underwritten, treaty reinsurance operates automatically — any risk that falls within the treaty's parameters is automatically covered without the reinsurer's case-by-case approval.
The two main treaty structures are: Proportional (or Pro-Rata) Treaties, where the reinsurer shares a proportional percentage of premiums and losses (including quota share and surplus share treaties), and Non-Proportional Treaties, where the reinsurer covers losses exceeding a specified retention (including per-risk excess, catastrophe excess, and aggregate excess treaties).
Treaties are typically annual contracts, negotiated and renewed each year based on the ceding company's experience, market conditions, and the reinsurer's appetite.
Why It Matters for Brokers
While brokers don't typically negotiate treaties directly, understanding how they work helps explain carrier behavior. When a carrier's treaty capacity is constrained, they may decline risks they would otherwise write. When treaty costs increase, the carrier passes those costs through in higher rates. Market-wide treaty renewals (particularly January 1 and June/July renewals) significantly influence the direction of primary insurance pricing.
Real-World Example
A regional property insurer maintains a catastrophe excess-of-loss treaty that covers losses exceeding $25M up to $200M per event. After a hurricane season with $18M in losses (below the treaty attachment), the treaty renews with a 15% rate increase and a higher attachment point of $30M. The insurer adjusts its underwriting guidelines, reducing maximum exposure per county, and increases rates on coastal property by 8-12% to absorb the higher reinsurance costs.
Common Mistakes
- 1Not recognizing that reinsurance treaty renewals (especially January 1) drive primary market pricing — rate increases or coverage restrictions often follow hard reinsurance renewals with a 3-6 month lag.
- 2Assuming a carrier's underwriting appetite is solely based on their own loss experience when treaty capacity and cost are equally significant factors.
- 3Ignoring the impact of catastrophe model updates on reinsurance pricing, which can cause significant rate changes even in years with minimal loss activity.
How brokerageaudit.com Handles This
The system monitors reinsurance market trends to help brokers anticipate pricing changes in the primary market. Understanding the reinsurance cycle helps brokers time submissions strategically and set realistic renewal expectations with clients.