S1 Certificate: what is it for and how can it be obtained in a professional immigration context?

In a context of growing international mobility, companies and their employees are faced with complex formalities, particularly in terms of Social Protection. The S1 certificate is one of those essential documents that ensures a smooth transition between two European healthcare systems. But what exactly is this certificate used for? And how can it be obtained without errors? Here is a closer look.

The S1 certificate: a bridge between two healthcare systems

The S1 certificate (formerly form E106/E121) is a document issued by the health insurance body of the country of origin. It allows an insured person – often in the context of temporary professional immigration – to benefit from healthcare coverage in another country of the European Economic Area (EEA) or in Switzerland, while remaining affiliated to their original scheme.

This document therefore facilitates access to healthcare in the country of residence, without double contributions and without any loss of rights in the country of affiliation. It forms part of the European coordination framework for Social Protection systems.

What is the S1 certificate used for by internationally mobile employees?

In the context of the posting of workers abroad, expatriation or a professional assignment, the S1 certificate offers several concrete advantages:

• it allows registration with the local health insurance system while retaining rights in the country of origin;
• it covers healthcare costs in the host country in accordance with local legislation;
• it guarantees continuity of Social Protection for the employee and, in some cases, for their dependants;
• it helps employers remain compliant with European regulations.

In short, the S1 certificate is an essential tool for staying compliant while ensuring healthcare coverage for internationally mobile employees.

Who can apply for an S1 certificate?

The S1 certificate is intended for several profiles in the context of professional immigration or cross-border situations:

• employees temporarily posted to another European country;
• cross-border workers;
• pensioners residing in another EEA country or in Switzerland;
• family members of the insured person, under certain conditions.

As each situation is different, a personalised assessment is often required to confirm eligibility.

How can an S1 certificate be obtained?

The S1 certificate is issued by the health insurance body of the country of affiliation. In France, this may be the CPAM, the MSA or the CNAREFE, depending on the employee’s profile (general scheme, agricultural scheme or expatriate status).

The application is generally submitted as a file, together with supporting documents (proof of posting, employment contract, proof of residence, etc.). Processing times may take several weeks, and any error or omission can delay the issuance of the certificate.

Why seek professional support?

Although the principle of the S1 certificate may appear straightforward, its implementation is often more complex, particularly in cases involving multi-country assignments, changes of status or accompanying family members.

Using a service provider specialising in professional immigration helps to:

• secure administrative procedures;
• avoid errors and unnecessary delays;
• remain compliant with European regulations;
• ensure optimal support for internationally mobile employees.

In summary, the S1 certificate is a key document for ensuring a successful transition to another European country, while complying with international mobility rules. Although it is possible to apply for it independently, support from a professional provides greater peace of mind… and helps avoid unpleasant surprises.