Posting of workers and Social Protection: what obligations apply to foreign employers?

The posting of workers to France does not only raise immigration or labour law issues. Social Protection is often the most costly risk area, as an error may lead to retroactive social contributions, URSSAF penalties and significant reassessments.

Social Protection in the context of the posting of workers represents a level of complexity that is often underestimated by international companies. Contrary to common belief, social obligations vary significantly depending on the employee’s country of employment: European Union / EEA, countries that have signed a bilateral Social Protection agreement with France, or countries with no agreement.

This article analyses these three scenarios from the perspective of Social Protection law, which requires a dedicated focus in the context of the posting of workers.

Intra-European posting: maintaining affiliation with the Social Protection system of the country of employment – the A1 certificate

Legal principle

Within the European Union, the European Economic Area and Switzerland, coordination of Social Protection systems is governed by Regulation (EC) No. 883/2004.

The principle is straightforward: a posted worker remains affiliated with the Social Protection system of their country of employment, provided that the competent authorities issue a valid A1 certificate.

Employer obligations

The employer must:

• Apply for an A1 certificate from the competent institution in the country of employment (link to the article on the A1 certificate on the English version of the PW website and the French version on the FI website)
• Request the certificate for a specific assignment duration (generally up to 24 months)
• Keep and present the A1 certificate in the event of an inspection in France (labour inspectorate, URSSAF, contracting authority)

Please note that the A1 certificate only applies within the EU / EEA / Switzerland and the United Kingdom (post-Brexit Withdrawal Agreement). For countries with a bilateral agreement, a specific certificate is issued. For countries without an agreement, no certificate is recognised by France.

Business implications

If a valid A1 certificate cannot be presented, URSSAF may consider that the employee is subject to the French Social Protection system and claim social contributions retroactively.

Posting from a country with a bilateral Social Protection agreement with France

Legal principle

France has signed numerous bilateral Social Protection agreements (for example with the United States, Canada, Japan, Brazil, Morocco, India, etc.). These agreements allow, similarly to the European framework, the employee to remain affiliated with the Social Protection system of the country of employment for a defined period.

However, as within the EU / EEA, the existence of an agreement alone is not sufficient: the posting certificate must be requested and obtained. Otherwise, the rules applicable to countries without an agreement will apply.

Employer obligations

The employer must:

• Request a bilateral posting certificate (equivalent to the A1 certificate) from the competent authority in the country of employment
• Respect the maximum duration defined by the bilateral agreement (often between 2 and 5 years depending on the country)
• Keep the certificate and present it in the event of an inspection.

Key point of attention

Each bilateral agreement has its own rules (duration, branches covered, possible extensions). A country-by-country analysis is therefore essential to avoid an automatic switch to the French Social Protection system.

We remain at your disposal to analyse your specific needs regarding the posting of workers to France.
(Link to the “Posting of Workers” service page on the French FI website or to the “Posting of Workers to France / Social Protection” service page on the English PW website.)

Posting from a country without a Social Protection agreement with France (high-risk situation)

Legal principle (often misunderstood)

When an employee is posted from a country that has no bilateral Social Protection agreement with France (for example China, Australia, Nigeria, the Philippines, etc.), there is no mechanism recognised by France allowing the employee to remain affiliated with the home country system.

The major consequence is that French social contributions are due from the first day of work in France.

This principle is confirmed by URSSAF through the dedicated portal for foreign companies and creates obligations for the foreign employer.

Employer obligations

In this situation, the employer must:

• Register with the Service des Firmes Étrangères (SFE)
• Declare the remuneration of posted workers on a monthly basis
• Pay mandatory French social contributions (health insurance, pension, etc.)
• Maintain payroll compliant with French rules for the Social Protection component.

Practical example: an employee posted from China to France

An employee posted from China to France (without a bilateral agreement):

• remains affiliated with the Chinese Social Protection system for their activity in China;
• but must also be affiliated with and contribute to the French Social Protection system for the work carried out in France.

This situation results in double social contributions, but also grants entitlement to French Social Protection benefits.

Why is this distinction critical for HR directors and international companies?

Risks in case of non-compliance

• URSSAF reassessments covering several years
• Penalties and late payment surcharges
• Joint liability of the contracting authority
• Operational disruption on construction sites or projects

Benefits of a compliant Social Protection strategy

• Predictability of international assignment costs
• Securing audits from clients and contracting authorities
• Reduction of reputational risks
• Overall optimisation of international mobility structures