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📊 '''Solvency margin ratio''' is a key regulatory metric that measures an [[Definition:Insurance carrier | insurance carrier's]] available capital relative to the minimum capital required by the applicable supervisory authority. Expressed as a percentage, it indicates whether an insurer holds sufficient surplus above its [[Definition:Regulatory capital | regulatory capital]] floor to absorb unexpected losses and honor [[Definition:Policyholder | policyholder]] obligations. A ratio above 100% means the insurer meets or exceeds the minimum threshold, while regulators in most jurisdictions set intervention triggers well above that baseline to provide an early warning buffer.

⚙️ The calculation divides an insurer's eligible capital — sometimes called available solvency margin or own funds — by the required solvency margin, which is determined under the relevant regulatory framework. In the European Union, [[Definition:Solvency II | Solvency II]] distinguishes between the Solvency Capital Requirement (SCR) and the lower Minimum Capital Requirement (MCR), each producing its own ratio. Japan's Financial Services Agency uses a similar concept under its solvency margin standard, where a ratio below 200% triggers graduated regulatory action. In China, the [[Definition:China Risk Oriented Solvency System (C-ROSS) | C-ROSS]] framework evaluates both quantitative capital adequacy and qualitative risk management scores, making the solvency margin ratio one component of a multi-pillar assessment. Under the United States' [[Definition:Risk-based capital (RBC) | risk-based capital]] system administered by the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]], the equivalent concept is expressed through the RBC ratio, which compares total adjusted capital to an authorized control level derived from formula-based risk charges. Despite these structural differences, the underlying purpose is consistent: ensuring that an insurer's capital base is proportionate to the risks it has assumed.

💡 Market participants beyond regulators pay close attention to solvency margin ratios. [[Definition:Rating agency | Rating agencies]] factor them into [[Definition:Financial strength rating | financial strength ratings]], and a deteriorating ratio can signal the need for capital raises, portfolio de-risking, or increased [[Definition:Reinsurance | reinsurance]] purchasing. [[Definition:Reinsurer | Reinsurers]] and [[Definition:Cedant | cedants]] alike monitor counterparty solvency ratios when negotiating treaty terms, as a weak ratio may lead to tighter [[Definition:Collateral | collateral]] requirements or reduced capacity. For insurers themselves, managing the ratio involves balancing growth ambitions against capital consumption — writing more [[Definition:Premium | premium]] increases the required margin, while retained earnings, subordinated debt, or fresh equity bolster the available margin. In practice, most well-capitalized insurers target ratios significantly above the regulatory minimum to maintain ratings, reassure policyholders, and preserve strategic flexibility in volatile markets.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Solvency II]]
* [[Definition:Risk-based capital (RBC)]]
* [[Definition:China Risk Oriented Solvency System (C-ROSS)]]
* [[Definition:Regulatory capital]]
* [[Definition:Financial strength rating]]
* [[Definition:Solvency risk]]
{{Div col end}}

Definition:Solvency margin ratio - Revision history

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