Capital & Regulation9 min read

Solvency II Non-Life Underwriting Risk: Standard Formula, USPs and Internal Models

By Jonas Mohamed Osman Abdelghafour

Published 16 September 2026

When the standard formula is adequate for non-life underwriting risk, when undertaking-specific parameters help, and what an internal model has to prove.

Executive answer

The standard formula applies market-wide volatility factors to premium and reserve volumes. It is adequate for many portfolios and clearly inadequate for others — notably those whose volatility, reinsurance structure or business mix differs materially from the calibration population. Recognising which case applies is itself a required assessment under ORSA.

Undertaking-specific parameters

USPs allow standardised methods to be applied to an undertaking's own data for premium and reserve risk. They require sufficient, relevant and reliable data and supervisory approval. Where they are available and the firm's experience is genuinely less volatile than the market factor, they offer a proportionate middle path before the cost of a full internal model.

What an internal model must demonstrate

Beyond statistical quality, an internal model must pass the use test, be embedded in decision-making, have documented validation independent of the developers, and have a governed change policy. In practice the use test and validation independence, not the mathematics, are where approvals stall.

Governance considerations

Firms should maintain a standing assessment of standard-formula appropriateness within ORSA, with quantified reasons rather than an assertion of adequacy. Supervisors have become markedly less tolerant of unevidenced appropriateness statements.

Conclusion

The right capital approach is the one whose limitations the firm can articulate. Jonas Mohamed Osman Abdelghafour advises on this choice with an emphasis on proportionality and evidence.

Primary sources

Solvency IIunderwriting riskinternal model