(51)Surplus funds should be valued in line with the economic approach laid down in this Directive. In this respect, a mere reference to the evaluation of surplus funds in the statutory annual accounts should not be sufficient. In line with the requirements on own funds, surplus funds should be subject to the criteria laid down in this Directive on the classification in tiers. This means, inter alia , that only surplus funds which fulfil the requirements for classification in Tier 1 should be considered as Tier 1 capital.