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📋 '''Excess of loss treaty (XoL)''' is a form of [[Definition:Reinsurance | reinsurance]] arrangement in which the [[Definition:Reinsurer | reinsurer]] indemnifies the [[Definition:Cedent | cedent]] for losses that exceed a specified [[Definition:Retention | retention]] (also called the attachment point), up to a defined limit. Unlike [[Definition:Quota share treaty | quota share treaties]], which spread every dollar of [[Definition:Premium | premium]] and loss proportionally, an XoL treaty activates only when losses pierce a predetermined threshold, making it a non-proportional structure. XoL treaties are among the most widely used reinsurance mechanisms globally, underpinning the [[Definition:Catastrophe reinsurance | catastrophe reinsurance]] programs of insurers from Tokyo to Zurich to New York.

⚙️ A typical XoL treaty is structured in layers — for example, a cedent might purchase $50 million excess of $25 million, meaning the reinsurer pays for losses between $25 million and $75 million attributable to a single event or risk. Programs are often stacked, with multiple layers placed across different reinsurers to build a full tower of protection. Pricing depends on [[Definition:Exposure analysis | exposure analysis]], historical [[Definition:Loss experience | loss experience]], and output from [[Definition:Catastrophe model | catastrophe models]], and is typically expressed as a [[Definition:Rate on line (ROL) | rate on line]]. [[Definition:Reinstatement | Reinstatement]] provisions specify whether and at what cost the coverage can be restored after a loss exhausts a layer. Regulatory frameworks like [[Definition:Solvency II | Solvency II]] in Europe and the [[Definition:Risk-based capital (RBC) | RBC]] system in the United States allow cedents to take [[Definition:Reinsurance credit | reinsurance credit]] for XoL treaties, reducing required capital — provided the contracts meet applicable standards for [[Definition:Risk transfer | risk transfer]].

💡 For the global insurance ecosystem, XoL treaties serve as the primary tool through which insurers transfer peak exposures — particularly those from natural catastrophes, large liability verdicts, and other tail risks that could otherwise threaten solvency. The annual reinsurance renewal season, centered around January 1 but with significant renewal dates in April (Japan) and July (U.S. property), is dominated by XoL negotiations. The structure gives cedents the freedom to retain predictable, attritional losses while capping their downside, and it allows reinsurers to deploy capacity precisely where they see attractive risk-adjusted returns. After years of catastrophe losses and [[Definition:Social inflation | social inflation]] pressures, XoL attachment points and pricing have become central topics in [[Definition:Reinsurance market cycle | market cycle]] discussions, directly influencing how [[Definition:Underwriter | underwriters]] across the value chain set their strategies.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Quota share treaty]]
* [[Definition:Retention]]
* [[Definition:Rate on line (ROL)]]
* [[Definition:Reinstatement]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Non-proportional reinsurance]]
{{Div col end}}

Definition:Excess of loss treaty (XoL) - Revision history

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