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📐 '''Internal capital model''' is a proprietary quantitative framework developed by an [[Definition:Insurance carrier | insurer]] or [[Definition:Reinsurer | reinsurer]] to assess its own capital needs based on the specific risk profile of its business, as opposed to relying solely on standardized regulatory formulas. In the insurance industry, these models integrate an organization's unique mix of [[Definition:Underwriting risk | underwriting risk]], [[Definition:Market risk | market risk]], [[Definition:Credit risk | credit risk]], [[Definition:Operational risk | operational risk]], and other exposures to produce a tailored estimate of the economic capital required to remain solvent at a given confidence level over a defined time horizon. While standard regulatory capital formulas apply uniform assumptions across the market, internal models allow firms to reflect nuances such as portfolio concentration, geographic diversification, and the correlation structure among their specific risks.

⚙️ Regulatory frameworks in several major markets explicitly accommodate or encourage the use of internal capital models. Under [[Definition:Solvency II | Solvency II]] in the European Union, insurers may apply for approval to use a full or partial internal model to calculate their [[Definition:Solvency capital requirement (SCR) | Solvency Capital Requirement]], subject to rigorous supervisory review covering statistical quality, calibration, validation, documentation, and governance standards. The approval process is demanding — regulators such as the [[Definition:Prudential Regulation Authority (PRA) | PRA]] in the UK and [[Definition:Bundesanstalt für Finanzdienstleistungsaufsicht (BaFin) | BaFin]] in Germany assess whether the model is genuinely embedded in the firm's decision-making, not merely used for regulatory compliance. In Bermuda, the [[Definition:Bermuda Monetary Authority (BMA) | BMA]] similarly allows approved internal models under its own solvency regime. The United States takes a somewhat different approach: the [[Definition:Risk-based capital (RBC) | RBC]] framework used by the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] does not formally incorporate internal models into statutory capital requirements, but insurers routinely build internal economic capital models for enterprise risk management purposes and use them alongside the statutory framework. Rating agencies such as [[Definition:AM Best | AM Best]] and [[Definition:Standard & Poor's | S&P Global Ratings]] also evaluate insurers' internal capital models as part of their financial strength assessments.

💡 Building and maintaining an internal capital model represents a significant investment in actuarial and quantitative talent, data infrastructure, and governance processes — but the payoff can be substantial. Firms with well-calibrated internal models often achieve a more efficient allocation of capital because the model captures diversification benefits and risk dependencies that blunt, one-size-fits-all regulatory formulas miss. This can translate into lower required capital for the same portfolio of risks, freeing resources for growth or returning capital to shareholders. Equally important, the discipline of constructing and validating such a model deepens an organization's understanding of its own risk landscape, strengthens [[Definition:Enterprise risk management (ERM) | enterprise risk management]], and improves strategic planning — including decisions about which lines of business to grow, which to exit, and how much [[Definition:Reinsurance | reinsurance]] to purchase. The model's outputs feed directly into [[Definition:Own risk and solvency assessment (ORSA) | ORSA]] processes and board-level risk appetite discussions, making it a central pillar of modern insurance governance.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Solvency capital requirement (SCR)]]
* [[Definition:Economic capital]]
* [[Definition:Risk-based capital (RBC)]]
* [[Definition:Own risk and solvency assessment (ORSA)]]
* [[Definition:Enterprise risk management (ERM)]]
* [[Definition:Solvency II]]
{{Div col end}}

Definition:Internal capital model - Revision history

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