Purpose – solvency II framework regulates how much capital the European Union insurance companies must hold. The amount of necessary capital can be calculated using a standard formula or an internal model. On the basis of the review of other authors’ empirical research, the present paper aim at identifying factors that influence necessary capital and proposing necessary areas of improvement for the methodology of an internal capital model. Research methodology – to conduct the paper, the authors have used the extended literature review. Analytical methods and comparative methods have been used for the Baltic non-life insurance market analysis. Findings – the Baltic market does not use an internal model even for a major risk – premium and reserve risks. A review of the current literature findings shows that the main weakness of the standard formula is risk aggregation. Research limitations – identified factors apply to non-life insurance companies under the Solvency II framework with a focus on reserve risk. Practical implications – factors are identified that should be implemented in the internal model methodology. The paper will help avoid using internal models as only a modern risk management tool and improve risk profile accuracy. Originality/Value – improvements of the internal model methodology are proposed based on a literature review. The authors have identified the main directions, issues and improvement possibilities for reaching modern risk management.