(15)An adjustment methodology that adequately addresses the circumstances referred to in recital 14 and that, therefore, takes account of the principle of proportionality and avoids distortions between banking sector structures of the Member States should be introduced up to the moment where all ex ante contributions paid in the Fund are fully mutualised. The method for calculating contributions should thus be adjusted in a manner such that it correlates to the rhythm of mutualisation of the Fund. Accordingly, the calculation of contributions to be allocated to the mutualised part should rely on the criteria laid down in Regulation (EU) No 806/2014, whereas, by derogation from the period of time provided for by Article 102(1) of Directive 2014/59/EU, the calculation of contributions to be allocated to the non-mutualised part of compartments should rely on the criteria laid down in Directive 2014/59/EU and on the basis of a target level defined over a period of time corresponding to the initial period set out in Regulation (EU) No 806/2014.