(10)This Regulation should be based on the new sectoral solvency regimes that have been established in the Union in order to ensure the most consistent application of the calculation methods. This Regulation should therefore not apply before the date of application of Regulation (EU) No 575/2013. The rules dependent on the application of Directive 2009/138/EC should begin to apply from the date of application of that Directive. Existing national implementation of the calculation of supplementary capital adequacy requirements should therefore continue to be used in those areas that have not been harmonised by this Regulation in the period before it applies in full, and underlying calculations that are based on insurance sectoral rules should be based on the insurance sectoral rules that apply at the time of that calculation.