The A1 certificate evidences which social security law applies to a person working in another EU state, Iceland, Liechtenstein, Norway, or Switzerland. It is required regardless of duration and is triggered even by one-day business trips. The relevant rules are posting under Art. 12, habitual activity in several states under Art. 13 with its 25 percent threshold, and exception agreements under Art. 16 of Reg. 883/2004. In Germany the employer must apply electronically, mandatory since 2019.
At a glance
- Required for any activity in another EU state and in Iceland, Liechtenstein, Norway, and Switzerland, regardless of duration
- The employer files the application; in Germany this has been mandatory electronically since 2019
- The certificate should be in place before the activity starts and carried while abroad
- Checks are common in Austria, France, Belgium, and Switzerland, with fines against employers and principals
- There is no A1 certificate for third countries; bilateral social security agreements apply there, or no coordination at all
The three constellations
- Posting (Art. 12 Reg. 883/2004): temporary activity in another member state for the German employer, up to 24 months. A posted person may not replace another posted person
- Activity in several states (Art. 13): anyone habitually working in two or more states is subject to the law of their state of residence, provided a substantial part of the work is performed there. Substantial generally means from 25 percent. This is the provision on which mobile work from abroad turns
- Exception agreement (Art. 16): on application, the outcome of Art. 12 and 13 can be departed from in an individual case. The Framework Agreement on cross-border telework also rests on this, allowing telework in the state of residence below 50 percent without responsibility shifting
Application and competent body
Applications run through the payroll software or the SV-Meldeportal. The competent body is:
- the statutory health insurer for people in statutory health insurance
- Deutsche Rentenversicherung Bund for people with private health insurance
- Knappschaft-Bahn-See for marginally employed staff (Minijob)
- the Arbeitsgemeinschaft Berufsständischer Versorgungseinrichtungen for members of a professional pension scheme
Retrospective applications are possible but not a fix: the certificate was not in place during the activity, and that is exactly what checks target.
FAQ
Does this apply to short business trips too?
Yes. The Regulation sets no minimum duration. In practice individual states handle short stays with differing strictness, but that is not something to rely on.
What happens without an A1 certificate?
A check in the country of activity can result in a fine, directed depending on the state at the employer, the principal, or both. On top of that comes the risk of a finding that contributions were due locally.
Does one certificate cover several trips?
For postings it is issued for the specific period and country. For regular activity in several states under Art. 13, a certificate is issued covering the relevant states and a longer period.
Does the A1 certificate replace travel health insurance?
No. It only governs which social security law applies. Access to treatment abroad runs through the European Health Insurance Card, and private cover can still be sensible.
What applies to the United Kingdom?
Since Brexit the EU Regulation no longer applies; the Trade and Cooperation Agreement does. It provides its own, broadly similar certification procedure. The process should be checked case by case.
Last updated: August 2026
This article provides general information and is not a substitute for legal advice in individual cases.
