by Marc Morsa, Senior Researcher at the Faculty of Law of the University of Louvain-La-Neuve
1. Social dumping and binding force of E101 certificate (A1 document)
1.1 The scope of the binding force of E101 certificate
In the fight against cross-border social fraud and social dumping the competent authorities of the host Member State in whose territory posted workers are employed often come up against the binding force attached to the E101 certificates stating that the worker concerned continued to be subject to the legislation of that Member State, and until which date. This binding force has been defined by the ECJ in a well-established jurisprudence[i]. This certificate thus necessarily implies that the other Member State’s social security system cannot apply[ii]. It establishes a presumption that the worker concerned is properly registered with the social security system of the Member State in which the undertaking employing him is established[iii][iv]
1.2 The cornerstone of the binding force of E101 certificate: the principles of loyal cooperation and mutual trust between the EU and its Member States
For the ECJ this presumption of regularity of affiliation derives from the principle of loyal cooperation, set out in Article 4 (3) TEU and its corollary, the principle of mutual trust[v]. Both principles impose on the social security institutions concerned a double reciprocal and interdependent obligation[vi]. Thus, to the negative obligation incumbent on the competent institution of the host Member State (and on all the courts and tribunals of the Member States regardless of the nature of the proceedings brought, whether civil or criminal) not to unilaterally challenge the certificate E101 – its particulars[vii] and not to question the validity of an E 101 certificate in the light of the elements on the basis of which it was issued corresponds to the positive obligation incumbent on the competent institution (issuing the E 101 certificate) to make a proper assessment of the facts relevant for the application of the rules relating to the determination of the legislation applicable to social security and, consequently, to ensure that the information contained in an E 101 certificate is accurate[viii].
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