Application for A1 form: The essential certificate for international business travel and assignment

When your employees travel abroad for work within the EU, EEA or Switzerland, one document is crucial: the A1 form. It proves which country’s social security system applies to your employee, fulfils the notification liability of employer and protects both your company and employees from double contributions or unexpected fines.

Without valid A1 forms, your employees may be denied the right to work temporarily abroad or face compliance checks that can cause delays and penalties. That is why having the A1 formsin check are essential for companies with international operations.

Why companies need A1 forms

An A1 form is the official proof of where social security contributions are paid, making it a mandatory requirement for employees working temporarily abroad. Via the A1 request, employers also fulfil the notification liability about performance of work of employers abroad. It also provides information about who the employer is and where the employee works and under what title. Because it is a unified form for the entire EU, it is also used by other institutions, such as labour inspectorates during the checks for the illegal work.

Authorities across the EU frequently request it during inspections and having the form ready helps avoid delays. For both employers and employees, it provides clarity and ensures mobility remains compliant, whether for a short trip or a longer assignment.

When A1 forms are required

The use of A1 forms goes beyond classic long-term postings. They are needed in many everyday scenarios, such as:

With large global gatherings, such as the Milan-Cortina 2026 Winter Olympics, UEFA EURO 2028 or world expos and trade fairs, compliance checks are especially common. Without A1 certificates, employees may not be allowed to work on-site and, for instance, officially represent their country or employer at the event.

Risks of not having A1 forms

Failing to secure an A1 certificate can cause serious issues for both employers and employees. Companies risk fines and penalties from local authorities (also in connection of illegal work), while unclear coverage may lead to double social security contributions. Employees can also be blocked from entering worksites (such as events) during inspections, which disrupts projects and damages client relationships. In short, without A1 forms, international assignments may be at risk before they even begin.

How to stay compliant

Applying for A1 forms may look straightforward, but the process differs from country to country and often requires careful timing. To avoid complications, companies should plan applications well ahead of employee travel, keep proper records of all issued forms and make sure staff carry the documents with them abroad. The employee should travel always with A1 certificate issued (or at least with the confirmation of A1 form request filing), EU health insurance card (EHIC), ID card or passport, copies of important work documents, such as employment contracts (translated into the local official language or at least into English), and other necessary documentation.

For longer projects, it’s equally important to track expiry dates and renew forms in time.

Managing these steps consistently can be challenging, especially when employees are working across several jurisdictions. Partnering with experienced professionals helps ensure every detail is handled correctly, giving companies peace of mind and keeping their workforce fully compliant.

Support with A1 forms and beyond

At Accace, we regularly support companies with cross-border workforce compliance. Whether it’s payroll, HR administration or guidance on A1 forms, our experts help businesses stay compliant and focused on their goals. With presence in over 60 locations worldwide and experience spanning almost 2 decades, we are confident that we can meet even your most demanding needs.

If you have upcoming international projects or events, reach out to us. We’ll help to ensure your employees are covered with the right documentation.