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The A1 Form: Essential Guide for Posting Workers in Europe



The A1 form is a crucial document for companies posting workers within the European Union (EU). It ensures that employees remain affiliated with their home country’s social security system while temporarily working abroad. By preventing double social security contributions, the A1 form guarantees compliance with EU regulations and protects workers’ rights.


What is the A1 Form?

The A1 form, formerly known as E101, certifies that a worker remains under their home country’s social security system during a temporary assignment in another EU country. This document is essential for employers and self-employed individuals to avoid double social contributions and ensure legal compliance with European Regulation No. 883/2004.


Who Needs the A1 Form?

Employers must request the A1 form for employees they post abroad. Self-employed workers operating in another EU country also need this form to prove their continued affiliation with their national social security system.


How to Obtain the A1 Form?

Here are the key steps to obtain the A1 form:

1. Gather Information: Include employee and employer details, mission duration, and the destination country.

2. Submit the Request: File the application online via national authorities.

3. Keep the Form: Workers must carry the A1 form during their assignment.


Example: Italian Worker Posted to France

An Italian engineering firm sends a technician to France for four months. The company applies for the A1 form from Italian authorities. During a labor inspection in France, the form proves that social contributions are paid in Italy, ensuring compliance with EU regulations.


Why Prepare in Advance?

Obtaining the A1 form avoids penalties, ensures legal compliance, and protects social rights. Contact us to streamline your posting process and secure compliance with EU rules.



A1 form, posting workers in Europe, social security compliance, EU regulations, double contributions.

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