Judgment_paragraph 42 · Boguslawa Zaniewicz-Dybeck v Pensionsmyndigheten (C-189/16)

42In such a case, Article 46(2)(a) of Regulation No 1408/71 provides that the competent institution is to calculate the theoretical amount of the benefit to which the person concerned is entitled as if all the periods of work which that person completed in various Member States had been completed in the Member State of the competent institution. The competent institution is then required, pursuant to Article 46(2)(b) of the regulation, to determine the actual amount of the benefit on the basis of the theoretical amount, in accordance with the ratio of the duration of the periods of insurance and/or residence completed in the Member State of the competent institution to the total duration of the periods of insurance and/or residence completed in the various Member States — in other words, the pro rata method of calculation.