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🔄 '''Mortgage reinsurance''' is [[Definition:Reinsurance | reinsurance]] purchased by [[Definition:Mortgage insurance | mortgage insurers]] to cede a portion of the [[Definition:Credit risk | credit risk]] they assume when guaranteeing residential mortgage lenders against borrower [[Definition:Default risk | default]]. Like reinsurance in other lines of business, it allows the primary mortgage insurer to reduce net exposure, stabilize earnings, manage [[Definition:Regulatory capital | regulatory capital]], and protect against [[Definition:Tail risk | tail-risk]] scenarios in which housing downturns trigger correlated defaults across large portfolios. The market for mortgage reinsurance has grown considerably since the 2007–2009 financial crisis, as regulators and [[Definition:Rating agency | rating agencies]] increasingly expect mortgage insurers to demonstrate robust risk-distribution programs.

📋 Structurally, mortgage reinsurance transactions take several forms. [[Definition:Quota share reinsurance | Quota share]] treaties allow the primary insurer to cede a fixed percentage of [[Definition:Premium | premiums]] and losses across a defined book of business, providing proportional capital relief. [[Definition:Excess of loss reinsurance | Excess of loss]] placements protect against severity — covering losses that exceed an attachment point on a given portfolio, much like a [[Definition:Catastrophe reinsurance | catastrophe layer]] in property reinsurance. In recent years, mortgage insurers have also turned to capital-markets solutions such as [[Definition:Mortgage insurance-linked securities | mortgage insurance-linked securities]] and [[Definition:Credit risk transfer (CRT) | credit risk transfer]] programs, which function as collateralized reinsurance. In the United States, the [[Definition:Private mortgage insurer eligibility requirements (PMIERs) | PMIERs]] framework established by the [[Definition:Government-sponsored enterprise (GSE) | GSEs]] explicitly recognizes qualifying reinsurance as a tool for meeting minimum capital thresholds, incentivizing robust cession programs. Similar dynamics apply in Canada, where [[Definition:Canada Mortgage and Housing Corporation (CMHC) | CMHC]] and private mortgage insurers utilize reinsurance to manage concentration in the Canadian housing market.

💡 Beyond capital management, mortgage reinsurance provides a valuable external check on underwriting quality. [[Definition:Reinsurer | Reinsurers]] conduct independent due diligence on the cedant's origination guidelines, [[Definition:Loan-to-value ratio (LTV) | LTV]] distributions, geographic concentrations, and claims-handling practices before committing capacity — a process that sharpens the primary insurer's own risk governance. For the global reinsurance market, mortgage risk offers diversification benefits because its loss drivers — unemployment, housing prices, interest rates — differ from the natural-catastrophe and casualty risks that dominate traditional reinsurance portfolios. As housing markets in Asia-Pacific, including Australia and parts of Southeast Asia, continue to develop private mortgage insurance sectors, demand for mortgage reinsurance is expanding beyond its traditional North American base.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Mortgage insurance]]
* [[Definition:Reinsurance]]
* [[Definition:Quota share reinsurance]]
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Credit risk transfer (CRT)]]
* [[Definition:Mortgage insurance-linked securities]]
{{Div col end}}

Definition:Mortgage reinsurance - Revision history

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