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🛡️ '''Reinsurer of last resort''' refers to an entity — typically a government-backed body, state pool, or supranational facility — that provides [[Definition:Reinsurance | reinsurance]] capacity when private-market [[Definition:Reinsurer | reinsurers]] are unwilling or unable to absorb a particular category of risk at commercially viable terms. The concept mirrors the "lender of last resort" function in banking and arises most often in connection with [[Definition:Catastrophe | catastrophic]] or systemic perils — nuclear events, pandemic-related business interruption, [[Definition:Terrorism risk insurance | terrorism]], or extreme natural catastrophes — where potential losses are so large, correlated, or unquantifiable that the private [[Definition:Reinsurance market | reinsurance market]] retreats.

🔄 In practice, these mechanisms take different forms across jurisdictions. The United States established the [[Definition:Terrorism Risk Insurance Act (TRIA) | Terrorism Risk Insurance Program]] after the September 11 attacks, under which the federal government acts as a backstop reinsurer once industry losses exceed specified triggers. France operates the [[Definition:Caisse Centrale de Réassurance (CCR) | Caisse Centrale de Réassurance]] with an unlimited state guarantee to cover natural catastrophe and terrorism exposures. Australia's [[Definition:Australian Reinsurance Pool Corporation (ARPC) | ARPC]] serves a similar function for terrorism and cyclone risk. The United Kingdom's [[Definition:Pool Re | Pool Re]] provides terrorism reinsurance to participating insurers with HM Treasury backing. In each case, primary [[Definition:Insurance carrier | insurers]] cede risk to the facility — often on terms mandated or standardized by regulation — and the facility in turn relies on its government guarantee rather than conventional [[Definition:Retrocession | retrocession]] to manage its own exposure. Some facilities charge risk-based premiums and accumulate reserves in normal years, aiming to minimize taxpayer exposure over time.

📉 The existence of a reinsurer of last resort fundamentally shapes market dynamics in the perils it covers. Without such backstops, primary insurers in many countries would simply exclude terrorism or extreme [[Definition:Natural catastrophe (nat cat) | nat cat]] risk from standard policies, leaving businesses and homeowners uninsured for the very events most likely to cause widespread economic disruption. The backstop therefore preserves insurability and supports economic stability. However, these arrangements also raise important questions about [[Definition:Moral hazard | moral hazard]], appropriate pricing, and the boundary between private risk transfer and public fiscal liability. As [[Definition:Climate change | climate change]] intensifies loss severity and new systemic risks like [[Definition:Cyber risk | cyber accumulation]] emerge, policymakers and industry leaders in markets from Singapore to the European Union are debating whether existing backstop mechanisms need expansion — or whether new ones must be created — to prevent growing segments of the economy from becoming effectively uninsurable.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Reinsurance]]
* [[Definition:Terrorism Risk Insurance Act (TRIA)]]
* [[Definition:Pool Re]]
* [[Definition:Government-backed insurance]]
* [[Definition:Catastrophe]]
* [[Definition:Residual market mechanism]]
{{Div col end}}

Definition:Reinsurer of last resort - Revision history

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