What is the A1 certificate?
The A1 certificate proves in which EU/EEA state a posted worker is covered by social security. It prevents double contributions and is required for every cross-border assignment — even for a single day.
When is it mandatory?
- When posting workers from another EU/EEA state to Germany.
- Also for self-employed subcontractors working across borders.
- Apply before work starts — retroactive applications are risky.
Application & validity
The application goes through the competent social-security body in the home country (in Germany: health insurer or DRV). The A1 is valid for a defined period and must be carried on site and presentable to FKS/customs.
Fines & risks
If the A1 is missing during an inspection, fines and back-payment of social-security contributions can follow — and it is an indicator of bogus self-employment. Clients should require it before work begins.
How EmployGuard helps
- Central storage of the A1 per worker and subcontractor.
- Automatic reminders before expiry.
- Instantly presentable during customs/FKS audits.
FAQ
Does every posted worker need their own A1?
Yes. The A1 is personal and must be applied for and carried individually by each posted worker or self-employed person.
Does the A1 apply to short assignments?
Yes. Even single-day cross-border assignments generally require an A1 certificate.
Who is liable if the A1 is missing?
Besides the posting company, the German client can also become liable — including back-payments and fines.