Judgment_paragraph 68 · AFMB Ltd and Others v Raad van bestuur van de Sociale verzekeringsbank (C-610/18)

68Admittedly, the system introduced by each of those regulations is solely a system for the coordination of the social security legislation of the Member States and not for the harmonisation of such legislation. It is inherent in such a system that differences may remain between the social security rules of the Member States, not least with regard to the level of social contributions to be paid in respect of a given activity (see, to that effect, judgments of 15 January 1986, Pinna, 41/84, EU:C:1986:1, paragraph 20, and of 9 March 2006, Piatkowski, C‑493/04, EU:C:2006:167, paragraph 20 and the case-law cited).