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

Countries / Territories
- π
Related contacts

Client Engagement Director Europe
Related offices
Related contacts

Client Engagement Director Europe
Related offices
Related contacts

Client Engagement Director Europe
Related offices
By: Wim Cocquyt, 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case law, that an A1 certificate is binding to the host countryβs authorities, as long as the certificate is not withdrawn by a competent institution of the issuing country.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 contacts

Client Engagement Director Europe
Related offices
Related contacts

Client Engagement Director Europe
Related offices
Related contacts

Client Engagement Director Europe
Related offices
Explore more at Fragomen
Media mentions
Partner K. Edward Raleigh explains that the Department of Laborβs Project Firewall expands H-1B oversight beyond individual complaints and increases the scope of employer compliance reviews.
Media mentions
UK Government Affairs Strategy Director Shuyeb Muquit examines how proposed settlement reforms could reshape the path to UK residency by extending qualifying periods and linking eligibility to individual contribution.
Podcast
Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi discuss critical immigration strategies underpinning healthcare-sector staffing in Canada, unpacking how recent policy, mobility and compliance developments are affecting employers and global talent pipelines.
Awards
Fragomen named Private Client Team of the Year at The British Legal Awards 2025, recognising the strength of our UK Private Client practice.
Media mentions
Partner Daniel Brown highlights rising deceptive practices in immigration and emphasizes stronger verification and compliance measures for employers.
Media mentions
Senior Manager Louise Senior highlights how proposed UK reforms could expand right to work checks across hospitality and reshape compliance for businesses.
Video
Rick Lamanna, Jake Paul Minster and Lunga Mani discuss Africaβs path to the 2026 World Cup.
Media mentions
Partner Louise Haycock notes that the UKβs new fast-track residency route for high earners could affect how businesses plan for immigration costs.
Blog post
Senior Manager Zaur Gasimov outlines Georgiaβs stricter residence-permit requirements and enhanced monitoring measures introduced under the countryβs 2025 immigration reforms.
Media mentions
Senior Manager Jonathan Hill explains why more UK universities are on UKVI student visa action plans and how extended timeframes help them address compliance issues.
Media mentions
Partner Karolina Schiffter explains why Poland has paused online residence permit bookings and returned to paper-based submissions.
Blog post
Senior Manager Ana Bessa Santos outlines Switzerlandβs 2026 immigration quotas and what employers should expect across non-EU/EFTA, EU/EFTA and UK permit categories.
Media mentions
Partner K. Edward Raleigh explains that the Department of Laborβs Project Firewall expands H-1B oversight beyond individual complaints and increases the scope of employer compliance reviews.
Media mentions
UK Government Affairs Strategy Director Shuyeb Muquit examines how proposed settlement reforms could reshape the path to UK residency by extending qualifying periods and linking eligibility to individual contribution.
Podcast
Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi discuss critical immigration strategies underpinning healthcare-sector staffing in Canada, unpacking how recent policy, mobility and compliance developments are affecting employers and global talent pipelines.
Awards
Fragomen named Private Client Team of the Year at The British Legal Awards 2025, recognising the strength of our UK Private Client practice.
Media mentions
Partner Daniel Brown highlights rising deceptive practices in immigration and emphasizes stronger verification and compliance measures for employers.
Media mentions
Senior Manager Louise Senior highlights how proposed UK reforms could expand right to work checks across hospitality and reshape compliance for businesses.
Video
Rick Lamanna, Jake Paul Minster and Lunga Mani discuss Africaβs path to the 2026 World Cup.
Media mentions
Partner Louise Haycock notes that the UKβs new fast-track residency route for high earners could affect how businesses plan for immigration costs.
Blog post
Senior Manager Zaur Gasimov outlines Georgiaβs stricter residence-permit requirements and enhanced monitoring measures introduced under the countryβs 2025 immigration reforms.
Media mentions
Senior Manager Jonathan Hill explains why more UK universities are on UKVI student visa action plans and how extended timeframes help them address compliance issues.
Media mentions
Partner Karolina Schiffter explains why Poland has paused online residence permit bookings and returned to paper-based submissions.
Blog post
Senior Manager Ana Bessa Santos outlines Switzerlandβs 2026 immigration quotas and what employers should expect across non-EU/EFTA, EU/EFTA and UK permit categories.
