EU Court of Justice Re-confirms the Possibility to Disregard Certificate of Coverage for Posted Workers
July 18, 2018

Countries / Territories
- π
Related offices
Related offices
By: Kristine Zaiceva
The Court of Justice of the European Union (hereafter CJEU) has re-confirmed its position regarding the validity of a Certificate of Coverage also commonly known as a CoC or an A1 certificate. The CJEU has stated that in case the host country has reasonable and concrete doubts regarding the conditions under which the A1 certificate was issued and the country that issued the A1 certificate refuses to reconsider these concerns the courts of the host country may decide to disregard the certificate.
The request for a Certificate of Coverage (commonly known as a CoC, or an A1 certificate amongst the countries that apply the EU Regulations on social security coordination) is fundamental to ensure full compliance with social security obligations for employees that are assigned to work abroad in another EU country on a temporary basis. The A1 certificate indicates in which country social security contributions are being paid and it should be kept available to be presented to the competent institution in the country where the assignee is temporarily working, to confirm the social security position of the employees concerned.
What is interesting about this judgement is that, on the one hand, it emphasizes again, as per consolidated case law, that an A1 certificate is binding to the host countryβs authorities, as long as the certificate is not withdrawn by a competent institution of the issuing country.
On the other hand, however, as it also was stated in a recent CJEU decision of last February, that the national courts of the host country may disregard an A1 certificate in case it was issued fraudulently and the issuing institution of the home country is not willing to withdraw it. Please find more details about the recent CJEU decision regarding this particular judgement in one of our previous blogs here.
With the judgment of July 11th, 2018 (case C-356/15), the CJEU has ruled that Belgium infringed the EU Regulations on social security by introducing rules in national legislation that do not meet the principles and requirements of the EU Regulations.
According to current Belgian legislation, where the national court, a public social security institution or a social inspector establishes there has been an abuse in the issuance of an A1 certificate by a given home country, the worker involved should be made subject to Belgian social security legislation.
What is notable about this judgment is that the CJEU has clearly stated that if a host Member State adopts legislation authorizing its own institutions to unilaterally declare an A1 certificate invalid, the principle of sincere cooperation between the competent institutions of the Member States would be jeopardised.
Consequently, the power to make a finding of fraud and to disregard an A1 certificate is limited to the national courts alone, only after the whole procedure of dialogue and conciliation, as laid down in the EU Regulations, has been followed and executed.
The Fragomen Social Security team is prepared to guide clients to optimise their social security programs and reduce related costs. Our strategic approach will help you plan ahead and ensure social security compliance from day one. For any social security related question, please feel free to contact us at [email protected] .
Countries / Territories
- π
Related offices
Related offices
Explore more at Fragomen
Blog post
Immigration Supervisor Michael Salas Guzman explains the key eligibility requirements, documentation considerations and benefits of Costa Ricaβs Pensionado residency program for retirees receiving lifetime pension income from abroad.
Media mentions
Senior Manager William Diaz outlines how US authorities evaluate prior criminal records under ESTA and what UK travellers need to know when completing their applications.
Awards
Canada Managing Partner Cosmina Morariu has received the France Canada Chamber of Commerce in Ontario (FCCCO) Women in Leadership Award, recognizing her leadership and contributions to the business and legal communities.

Media mentions
Managing Director Diogo Kloper highlights how Brazilβs new electronic visa for Chinese citizens reduces bureaucracy, lowers costs and streamlines business and tourism travel.
Blog post
Partner, Global Responsible Business Practices, Lisa Koenig, Lead Analyst Dominic Dietrich, Senior Associate Sarah Blackmore and Senior Associate Sonya Berenfeld Cole examine why climate disruptions are reshaping mobility strategy as economic loss, workforce displacement and travel risks require organizations to reassess workforce planning and operational resilience.
Media mentions
Associate Ilaria Iovieno and Immigration Consultant Sean Pearce explain how the UKβs higher English language requirement for work visas affects construction employers.
Visas
Senior Business Immigration Manager Vicente Duque outlines key immigration considerations for international visitors traveling to Mexico for the 2026 FIFA World Cup, including visa eligibility, entry documentation and travel between host countries.
Video
Explore EU visa options for non-EU nationals, including Schengen, long-stay and work visas like the EU Blue Card. Find the right visa for your needs.
Blog post
Counsel Susan Steger examines how wage-driven selection mechanisms in programs such as the H-1B lottery and PERM can create incentives for artificial wage inflation and introduce new compliance and workforce planning challenges for employers.
Media mentions
Director Gemma Hyslop examines how collaboration across the global mobility sector can help strengthen legal pathways and support for migrant women experiencing abuse.
Media mentions
Partner Abeer Al Husseini discussed immigration and duty-of-care challenges for employers amid Middle East travel disruptions.
Awards
Partner Sarah K. Peterson is recognized by the Minneapolis/St. Paul Business Journal as a 2026 Women in Business honoree for her professional achievements and contributions to the Twin Cities business community.
Blog post
Immigration Supervisor Michael Salas Guzman explains the key eligibility requirements, documentation considerations and benefits of Costa Ricaβs Pensionado residency program for retirees receiving lifetime pension income from abroad.
Media mentions
Senior Manager William Diaz outlines how US authorities evaluate prior criminal records under ESTA and what UK travellers need to know when completing their applications.
Awards
Canada Managing Partner Cosmina Morariu has received the France Canada Chamber of Commerce in Ontario (FCCCO) Women in Leadership Award, recognizing her leadership and contributions to the business and legal communities.

Media mentions
Managing Director Diogo Kloper highlights how Brazilβs new electronic visa for Chinese citizens reduces bureaucracy, lowers costs and streamlines business and tourism travel.
Blog post
Partner, Global Responsible Business Practices, Lisa Koenig, Lead Analyst Dominic Dietrich, Senior Associate Sarah Blackmore and Senior Associate Sonya Berenfeld Cole examine why climate disruptions are reshaping mobility strategy as economic loss, workforce displacement and travel risks require organizations to reassess workforce planning and operational resilience.
Media mentions
Associate Ilaria Iovieno and Immigration Consultant Sean Pearce explain how the UKβs higher English language requirement for work visas affects construction employers.
Visas
Senior Business Immigration Manager Vicente Duque outlines key immigration considerations for international visitors traveling to Mexico for the 2026 FIFA World Cup, including visa eligibility, entry documentation and travel between host countries.
Video
Explore EU visa options for non-EU nationals, including Schengen, long-stay and work visas like the EU Blue Card. Find the right visa for your needs.
Blog post
Counsel Susan Steger examines how wage-driven selection mechanisms in programs such as the H-1B lottery and PERM can create incentives for artificial wage inflation and introduce new compliance and workforce planning challenges for employers.
Media mentions
Director Gemma Hyslop examines how collaboration across the global mobility sector can help strengthen legal pathways and support for migrant women experiencing abuse.
Media mentions
Partner Abeer Al Husseini discussed immigration and duty-of-care challenges for employers amid Middle East travel disruptions.
Awards
Partner Sarah K. Peterson is recognized by the Minneapolis/St. Paul Business Journal as a 2026 Women in Business honoree for her professional achievements and contributions to the Twin Cities business community.
