Regular activities in two or more Member States (multistate work) - art. 13 of Regulation (EC) n° 883/2004

The application must be completed by the employer in cases where the insured normally carries out his professional activity in two or more countries of the European Union (EU), the European Economic Area (EEA), Switzerland (Article 13 of Regulation (EC) N° 883/2004 and Article 16 of Regulation (EC) N°987/2009) or the United Kingdom (in accordance with Article SSC.12 of the Trade and Cooperation Agreement adopted on 24 December 2020 including a Protocol on Social Security Coordination), in order to determine the applicable legislation:

• for residents of Luxembourg, the applicable legislation is determined by the competent Luxembourg body, i.e. the Social Security Center (Centre commun de la sécurité sociale - CCSS), in accordance with the above-mentioned articles. If Luxembourg legislation is designated as being applicable, the competent body will issue an A1 certificate.
• for residents outside Luxembourg, the applicable legislation is determined by the competent body in the country of residence in accordance with the above-mentioned articles. If Luxembourg legislation is designated as being applicable, the CCSS will issue an A1 certificate.