You are here:
11 July 2018 / article

Court of Justice condemns Belgian system for disregarding the A1 Declaration

On 11 July 2018, the Court of Justice issued an important ruling in the case C-356/15 European Commission versus Belgium.

The Court of Justice ruled that Belgian legislation, which provides that Belgian authorities can unilaterally declare posted workers subject to the Belgian social security legislation, is inconsistent with EU legislation.

Court of Justice condemns Belgian system for disregarding the A1 Declaration

A1 Declaration is presumed to be binding

An A1 Declaration is an official document issued by a Member State in which a company that is posting workers is established. It constitutes a presumption that the posted workers are regularly affiliated to the social security scheme of that Member State. In principle, the Member State in which those workers are being posted is bound by such declaration. 

In 2013, the Commission initiated an infringement procedure against Belgium because of the programme law of 27 December 2012. This legislation allows the Belgian competent authorities to decide unilaterally, without following the dialogue and reconciliation procedure included in EU legislation, that A1 Declarations of posted workers can constitute an abuse of rights.

Dialogue- and reconciliation procedure

Referring to its recent Altun case-law, the Court of Justice emphasised that Member states should always follow a specific dialogue- and reconciliation procedure in case of doubts about the A1 declaration.

  • First, the competent authorities of the Member state of origin is obliged to properly asses and re-evaluate the facts underlying the A1 declarations they have issued;
  • If doubts remain, the case should be brought before the administrative commission of the European Union (;
  • Should this commission fail to reconcile the views, a specific procedure of ‘non-compliance’ has to be initiated;
  • Only if the Member State of origin does not re-evaluate the situation within a reasonable period of time, Belgian authorities are allowed to set aside the A1 declaration on the basis of national legislation.

Belgian arguments are insufficient

According to Belgium, the prohibition of abuse of rights is a general principle of law which allows Member States to derogate from EU law, including the dialogue- and reconciliation procedure. The Court of Justice, however, decided that the unilateral decision process of Belgium is inconsistent with EU legislation (EU Regulation No 883/2004 and EU Regulation No 987/ 2009). In the future, even in case of obscure A1 Declarations, it will be more complicated to set aside its binding nature.

Class/collective actions in Belgium: overview

Class/collective actions in Belgium: overview

A Q&A guide providing an overview of class actions in Belgium, including the legal framework, current trends and the recent extension to SMEs. read more
The rise of the Code of Companies & Associations

CJEU rules on 'tender shaping' practices in the medical device sector

On 25 October 2018, the CJEU ruled in Case C-413/17 on the margin of discretion of contracting authorities to establish technical specifications in relation... read more
Alcohol at New Year’s reception

Alcohol at New Year’s reception: what risks do you face as an employer?

The period of New Year receptions at work is approaching again. Do you, as an employer, have to take precautions to limit alcohol consumption? Who is liable... read more
Stay informed

Don't miss out. Stay up to date about our latest news and events.