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🛡️ '''Excess of loss reinsurance (XoL)''' is a form of [[Definition:Non-proportional reinsurance | non-proportional reinsurance]] in which the [[Definition:Reinsurer | reinsurer]] indemnifies the [[Definition:Cedant | ceding insurer]] for losses that exceed a specified retention — known as the [[Definition:Attachment point | attachment point]] — up to a defined limit. Unlike [[Definition:Quota share reinsurance | quota share]] or other [[Definition:Proportional reinsurance | proportional]] arrangements that share every loss from the first dollar, XoL responds only when a loss or accumulation of losses breaches the agreed threshold. This makes it the primary tool insurers use worldwide to protect themselves against large individual claims, [[Definition:Catastrophe | catastrophe]] events, and unexpected loss severity.

⚙️ XoL contracts are structured in layers, each defined by its attachment point and its limit — for example, a layer might cover $10 million in excess of a $5 million retention. Cedants typically purchase multiple consecutive layers to build a tower of protection, with each successive layer attaching where the one below exhausts. The main variants are per-risk XoL, which responds to individual large losses on a single risk; per-occurrence or per-event XoL, which aggregates all losses from a single event such as a hurricane or earthquake; and aggregate XoL (sometimes called stop loss), which caps the ceding company's total losses over an annual period. Pricing relies heavily on [[Definition:Actuarial science | actuarial]] modeling of loss distributions, [[Definition:Catastrophe model | catastrophe models]], and historical experience, with reinstatement provisions specifying whether and at what cost the cover can be restored after a loss. Major [[Definition:Reinsurance | reinsurance]] markets — including [[Definition:Lloyd's of London | Lloyd's]], Bermuda, Singapore, and Continental European hubs such as Zurich and Munich — actively trade XoL capacity, and negotiation of terms, conditions, and pricing forms the core activity of the annual renewal cycle.

💡 For primary insurers, XoL reinsurance is essential to capital management and regulatory compliance. By capping net exposure to severe losses, it stabilizes earnings, protects [[Definition:Solvency | solvency]] margins, and enables the insurer to write larger or more volatile risks than its own balance sheet could otherwise support. Regulatory regimes recognize this value: under [[Definition:Solvency II | Solvency II]], eligible XoL arrangements reduce the [[Definition:Solvency capital requirement (SCR) | solvency capital requirement]]; under the U.S. [[Definition:Risk-based capital (RBC) | RBC]] framework and China's [[Definition:C-ROSS | C-ROSS]], qualifying reinsurance similarly lowers required capital. The structure also creates meaningful [[Definition:Counterparty risk | counterparty risk]] — if the reinsurer fails to pay, the cedant retains the full loss — which is why collateralization, [[Definition:Trust fund | trust funds]], and reinsurer credit quality remain persistent concerns for both insurers and their regulators.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Non-proportional reinsurance]]
* [[Definition:Attachment point]]
* [[Definition:Quota share reinsurance]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Reinstatement (reinsurance)]]
* [[Definition:Cedant]]
{{Div col end}}

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

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