Foreign worker payroll: contributions and compliance

Quick answer. Foreign worker payroll starts with the territoriality principle: an employee who works in France is in principle subject to the French social security scheme, regardless of nationality or where the employer's head office is located. Contributions are therefore due in France, unless a posting or an applicable agreement says otherwise.

Hiring, or receiving on assignment, an employee from abroad raises a concrete question that does not wait for the first payslip: where are the contributions due, and who declares them? Foreign worker payroll is not a question of nationality, it is a question of social affiliation. Most of the mistakes we see in setup or growth files do not come from a complicated payroll calculation, but from a wrong starting point: people assume the employee stays affiliated in their home country because they are foreign, when the default rule is exactly the opposite.

This guide sets out the affiliation logic, distinguishes the cases (French general scheme, posting within the EU with the A1 certificate, situations outside the EU governed by agreement), and lists the employer's obligations, including the foreign employer with no establishment in France. This is a matter of principle: each file deserves a case-by-case review, but this framework keeps you clear of the most costly misreadings.

The anchor point is simple. An employee carrying out their activity in France is in principle subject to the French social security scheme, regardless of nationality and of where the employer's head office is located. In other words, it is neither the employee's passport nor the company's address that decides, it is the place where the work is actually performed.

Direct consequence: French social contributions are in principle due in France, and the employee is declared like any other employee covered by the French scheme, through the DSN. Before looking for an exception, you must therefore start from this principle, then check whether a derogation applies. Reversing this logic is the first source of error.

Territoriality has framed exceptions. Under precise conditions, they allow an employee to be kept under the social security scheme of their home country rather than affiliated in France. The whole point is knowing which one applies, and being able to prove it.

Posting within the EU, the EEA and Switzerland: the A1 certificate#

An employee posted temporarily may, by exception, remain affiliated to the social security scheme of their home country. Within the European Union, the European Economic Area and Switzerland, the A1 certificate attests to the applicable social security legislation and to the continued affiliation to the home scheme during the posting.

The A1 is the key document in the file. Without it, continued foreign affiliation cannot be relied upon, and the authorities may consider that the employee falls under the French scheme. The same document is also used in multi-state situations, where an employee works in several countries: specific rules then determine the applicable legislation, and the A1 attests to the competent state.

Outside the EU: bilateral agreements#

Outside the EU, the EEA and Switzerland, it is not the European regulations that apply but the bilateral social security agreements concluded between France and the country concerned. These agreements govern affiliation and may allow, depending on their terms, continued affiliation to the home scheme.

The point to watch is clear: where there is no agreement between the two states, double affiliation is possible. The employee may then owe contributions both in their country and in France. This scenario changes the economics of an assignment and must be anticipated before the employee arrives, not discovered on the first payslip.

Table: where is the employee affiliated?#

Before even discussing contributions, you must make sure the employee is allowed to work. A non-EU national must hold a work authorisation and a residence permit allowing them to work. The employer is required to verify this right before hiring.

This check is not a simple box to tick. It conditions the lawfulness of the hire and exposes the employer in case of failure. In practice, it is also a matter of timing: obtaining or renewing an authorisation can take time, and it is safer to secure this aspect early. To distinguish residence permit, right to work and residence, see our article on the status of foreign nationals in France and tax residence.

A frequent case in international files: a foreign company, with no establishment in France, employs a person who works on French territory. The company sometimes thinks it escapes French obligations because it is not based there. That is a mistake.

Once the employee works in France and falls under the French scheme, the foreign employer remains liable for French contributions. It may use a simplified scheme dedicated to foreign companies to complete its declarations and pay contributions, without having to set up an establishment. This point is central for US, UK or other companies wishing to employ someone in France: the absence of an establishment does not remove the social obligation, it only changes the way it is fulfilled.

Here is the sequence we follow in our files, before and after hiring.

1. Identify the actual place of work. France, abroad, or several countries: this is what triggers the territoriality rule or the multi-state rules.
2. Check the right to work for a non-EU national: valid work authorisation and residence permit.
3. Determine affiliation: French scheme by default, or home affiliation if an exception applies.
4. Secure the supporting document: request the A1 certificate (EU/EEA/Switzerland) or check the bilateral agreement (outside the EU) before the start.
5. Map the employer: French company, or foreign company with no establishment that must use the simplified scheme.
6. Set up payroll and the DSN: integrate the employee into the French scheme where this is the applicable rule.
7. Document the file: keep the affiliation and right-to-work evidence, so it can be presented in case of audit.

To automate the calculation and the production of payslips, we rely on modern payroll tools; see our overview of Silae. Day-to-day handling is part of our payroll and social services in Paris.

What matters most is not the technical complexity of payroll, it is the quality of the starting point. In our international files, the real issue is almost always affiliation: have we properly established where the employee is affiliated, and do we have the evidence to back it up? A technically flawless French payslip built on unsecured affiliation remains fragile.

Our recommendation is constant: settle affiliation before the first day worked, obtain the supporting document (A1 certificate or agreement document) upfront, and never rely on the intuition that "they are foreign, so they pay contributions at home". The default rule points the other way.

The underestimated risk#

The most often overlooked risk is double affiliation outside the EU where there is no agreement. People reason as if continued home affiliation is automatic, then discover, once the assignment has started, that the employee may owe contributions both in their country and in France. This increases the cost of the employee and complicates their situation. The risk is neutralised upfront, by checking the existence and content of an agreement before committing.

Another frequent blind spot: the foreign employer who believes that having no establishment in France exempts it. It remains liable for French contributions and must organise its declarations through the simplified scheme.

• Hybrid work and multi-state activity. Cross-border remote work multiplies the cases where an employee works in several states. This can shift the applicable legislation and must be documented. See our guide on working abroad and taxation.
• Do not confuse social and tax. Social affiliation and tax residence (income tax) follow their own distinct rules. An employee may be affiliated in France without that automatically settling their income tax situation.
• French contributions and payroll rules. Employees covered by the French scheme fall within the scope of standard payroll mechanisms; see our explanation of the single degressive general reduction.

A foreign company wishes to employ a person based in Paris, thinking it will keep them affiliated in its country "since the contract is foreign". On reading the file, two corrections usually apply: first, since the work is performed in France, the French scheme applies in principle; second, the absence of an establishment does not remove the obligation, it requires using the simplified scheme for foreign companies. The right reflex is to check affiliation and the supporting document before signing, not after.