A1 Multi-State Activity
A1 scenario for people who habitually work in several countries.
On this page
In brief for employers
A1 multi-state activity is the A1 use case for people who usually work in several countries. For HR, this matters because these cases should not be treated like a single business trip or one-off posting.
Definition
A1 multi-state activity applies when a person regularly performs activities in several states and the applicable social security legislation must be determined. The A1 certificate then documents which social security law applies to this multi-state pattern.
The underlying employment pattern is multi-state employment. A1 multi-state activity describes the concrete evidence and form process.
Typical checks
- Which countries are part of the regular work pattern?
- How much working time is spent in each country?
- Where is the employee resident?
- Which employer or employers are involved?
- Is the activity stable enough for a multi-state assessment?
- Which validity period should the A1 cover?
- How will HR and Payroll monitor later changes?
Difference from a posting A1
A posting A1 usually relates to a temporary activity in one other country. A1 multi-state activity relates to regular work in several countries. This is why HR should review the pattern itself, not only the next trip.
How Vamoz helps with A1 multi-state activity
Vamoz A1 Forms structures the request, captures countries and working patterns, and helps HR keep the resulting A1 process documented.
Manage social security evidence centrally
With Vamoz, HR identifies relevant cases early and keeps A1 and social security evidence traceable.
Frequently asked questions
Is A1 multi-state activity the same as multi-state employment?
No. Multi-state employment is the work pattern. A1 multi-state activity is the evidence process linked to that pattern.
When should HR update the assessment?
When residence, country shares, role, employer or working pattern changes.