Social Security

Information on Social Security for Associated Members of the Personnel (MPAs)

The following information is intended for (future) Associated Members of the Personnel (MPAs), who are employed in an EU or EFTA country, in particular MPAs of categories User (USER), Cooperation Associate (COAS) and Visiting Scientist (VISC), which are the categories of personnel that are administratively handled by the Users’ Office.

The EU has defined a set of regulations (EU Regulation 883/2004) on the coordination of social security systems in the EU and EFTA Member States (Iceland, Liechtenstein, Norway and Switzerland), which was put in force in 2010.

The EU regulation defines rights and rules for posted workers, which are employees in an EU or EFTA Member State, who are sent by their employers to carry out a service in another EU or EFTA Member State on a temporary basis.

The EU regulation requires posted workers to carry with them always an A1 certificate, certifying the social security situation of the employee. The A1 certificate needs to be requested by the employee from the employer.

The Swiss Authorities clarified that, despite the immunities and privileges of Associated Members of the Personnel (MPAs), the EU regulation 883/2004 also applies to MPAs (USER, COAS, VISC in particular), who are employed in an EU or EFTA Member State and are sent by their home institution to CERN. MPAs are not part of the CERN social security coverage and have to comply with the national social security laws that are applicable to them.

Those MPAs are considered as posted workers the sense of EU regulation 883/2004 and in particular, they should always carry an A1 certificate always while travelling to and at CERN.

According to the EU regulation, after postings longer than 24 months, posted workers can either:

  • switch to the social security system of the host country OR
  • apply for an extension and remain covered in the home country

However, CERN Associated Members of the Personnel (MPAs) and their family members, who are resident at CERN (> 50 % presence) and are holders of a type “P” legitimation card, enjoy privileges and immunities, but are not subject to Swiss social insurance (AVS) and may not join the latter even on a voluntary basis.

As a consequence, the concerned MPAs need to apply for an extension to remain covered in the social security system in their home country, as they cannot join the Swiss system. The Permanent Mission of Switzerland to the United Nations Office kindly provided an attestation (in French and English), that concerned MPAs can use as justification supporting their application for an extension to remain covered in the social security system of their home countries.

Updated on
30-03-2020