What is the purpose of the A1 Certificate and how can it be obtained?

What is an A1 Certificate?

The A1 Certificate is an essential document for workers who temporarily carry out a professional activity in a country linked to France through European regulations (EU–EEA–Switzerland or through a framework agreement with the United Kingdom).
This certificate confirms that the worker remains affiliated with the Social Security system of their country of employment and that Social Protection contributions continue to be paid there, even while working temporarily abroad.

Why is the A1 Certificate essential?

The A1 Certificate is crucial in the context of international mobility. It certifies the country of affiliation for the worker and the applicable Social Protection legislation. The foreign employer is thereby exempt from paying Social Protection contributions in the host country.
It is required in several professional scenarios, including:

• Posting of workers: when an employee is sent by their employer to work in another EU country for a maximum period of 24 months.
• Self-employed workers: when a non-salaried worker temporarily carries out their activity in another EU country (up to 24 months).
• Simultaneous work in multiple countries: for employees who alternate their activity across several Member States.

Obtaining the A1 Certificate is therefore essential to ensure the worker’s social coverage and to formally establish the applicable Social Protection legislation.

What happens if there is no A1 Certificate?

Without the A1 Certificate, a worker sent abroad may become subject to Social Protection contributions in the host country. This can result in additional costs for the employer or self-employed person.
In the event of an inspection, failure to present this document can lead to sanctions and complicate the worker’s administrative situation.

Conclusion

The A1 Certificate is a mandatory document for workers carrying out activities outside their country of employment. It determines which Social Protection legislation applies.
It serves as proof of two key principles:

• The principle of uniqueness: A worker is subject to only one Social Protection system at a time.
• The principle of territoriality: Social contributions are due in the country where the professional activity is carried out.

In the event of a labour inspection, failure to produce the A1 Certificate may be considered a breach of regulations, potentially resulting in Social Protection contributions being deemed payable.