Do you need an A1 certificate
to work in Germany?
Client, customs (Zoll) or the site is asking for an A1 certificate — and you're not sure if, for whom and how? Practical guidance for posted employees, self-employed contractors and subcontractors working in Germany.
A1 is requested often — but not in the same way in every situation.
When it can be a legal requirement, when the client or site demands it, and how to prepare realistically.
- ✔Experience with German construction sites, refineries and industrial projects
- ✔Direct A1 support for companies registered in Czech Republic and Slovakia
- ✔Practical guidance for contractors from CZ, SK, PL, RO, HU
We advise from the perspective of an HSE practitioner who knows when A1 is actually required on German sites.
Who typically needs an A1 certificate
The A1 certificate proves in which EU member state a person is covered by social security. Depending on the form of work, it is requested more or less often.
Posted employees
Employees temporarily working in Germany for their employer. A1 is requested in the vast majority of posting situations.
Self-employed contractors
EU self-employed contractors temporarily working in Germany may also need A1 — particularly when working for a German client.
Subcontractors
Subcontractor crews on German construction sites, refineries and industrial plants are commonly asked for A1 by the client or the main contractor.
Companies posting workers
When a company sends its own employees to Germany, A1 typically appears together with the posting notification.
Important: whether A1 is strictly legally required in a specific case depends on the form of work, the home member state and the applicable rules. „A1 is always mandatory“ is not accurate — neither is „A1 is never needed“.
Who actually asks for the A1 certificate in practice
On German industrial projects, A1 is not requested by a single party. You need to be ready for customs, clients and HSE departments all at the same time.
Zoll (FKS) during inspections
On construction sites, the customs financial control unit (FKS) typically checks A1 and other posting documents.
German clients
Clients often include A1 in the onboarding package — as proof that social security is registered in the home country.
Main contractors
GCs routinely require A1 from subcontractors as a condition for signing the contract or starting the work.
Refineries and industrial plants
In large industrial plants A1 is often a mandatory part of the gate access pack.
HSE departments
HSE departments verify A1 as part of compliance before releasing the work front.
Site onboarding / gate access
At site onboarding, A1 is usually checked together with toolbox briefings, risk assessment and PPE proofs.
German project reality often requires more preparation than foreign companies initially expect.
Legal requirement vs. project reality
Two layers that get mixed up. To get onto a German site, you need to understand both.
What EU social-security rules set out
- • A1 proves which social-security system is responsible
- • In posting situations, A1 is foreseen in many cases
- • Self-employed can also apply for A1 when working in another member state
- • The concrete obligation depends on the individual case and home country
What German projects and clients ask on top
- • A1 as a standard onboarding document
- • A1 as a prerequisite for plant access
- • A1 together with toolbox briefings, risk assessment, PPE matrix
- • A1 as part of subcontractor compliance
- • A1 as proof for the main contractor
Even where A1 would not be strictly legally required in a given case, on a German industrial site it will most likely still be requested.
How we help you with A1 for Germany
We don't think like lawyers — we think like a project team: what does the client expect, what does the gate want, what does Zoll look at, and how do you align that with your crew.
Situation assessment
We go through your work setup, client and project type and tell you where A1 typically applies.
Clarify onboarding expectations
We map what the German client actually expects at onboarding — A1, posting notification, insurance, additional proofs.
Document guidance
Practical guidance on which documents to have ready before going to the site in Germany.
Project preparation
We help you prepare the relevant documents — A1 included — in a structured way before you travel.
Crew-side support
Practical support for your crew so they aren't caught off guard at the gate.
At present we can directly process / actively support A1 only for companies registered in Czech Republic and Slovakia.
For companies based in other countries (PL, RO, HU and others) we still provide practical guidance on A1 expectations, onboarding and German site requirements — the A1 application itself must be filed via the responsible authority in the home country.
What can happen without proper A1 preparation
Realistic scenarios from live projects — no scare tactics, just a clear view of the impact on your schedule.
Delayed project start
When A1 is missing at onboarding, the crew often starts work several days late.
Site / plant access blocked
Without a complete document pack — A1 included — the crew is frequently turned away at the gate.
Client requests mid-project
Clients ask for missing A1 certificates in the middle of a project, blocking follow-up work.
Pressure during Zoll inspections
If posting documents can't be presented on site, inspections quickly become uncomfortable.
Onboarding bottlenecks
HSE departments delay release until A1 is properly in place.
Disputes with the main contractor
GCs start questioning compliance — and with it, the reliability of your company.
Common questions about A1 for Germany
Do I always need an A1 certificate for Germany?+
No, not every activity in Germany strictly requires an A1 certificate. In posting and many self-employed setups, however, it is requested very often — both legally and by clients and sites.
Can self-employed contractors also need A1?+
Yes. EU self-employed contractors temporarily working in Germany can also apply for A1. In practice, German clients regularly demand it from sole traders too.
Who checks A1 in Germany?+
Mainly the Financial Control of Undeclared Work (Zoll FKS), but also clients, main contractors and HSE departments of large industrial projects.
Can a client request A1?+
Yes, and it's very common. A1 is a standard part of many onboarding packages for foreign subcontractors.
Is A1 enough for site / plant access?+
A1 is an important building block, but on its own it is usually not enough. Sites additionally expect toolbox briefings, risk assessment, PPE proofs and project-specific onboarding.
Can you arrange A1 certificates for us?+
We can directly process / actively support A1 only for companies registered in Czech Republic and Slovakia. For other countries we still advise on the requirements, but the application itself has to go through the responsible authority in the home country.
Which countries do you currently support directly?+
Czech Republic (CZ) and Slovakia (SK) — for these two countries we can concretely guide the A1 process.
Can you help Czech and Slovak companies?+
Yes. Companies registered in CZ and SK we can support directly with A1 for Germany — from situation assessment to concrete handling.
What if we're unsure about A1?+
Then talk to us. We will look at your situation, give you a realistic assessment and tell you clearly what makes sense next.
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Let's run through your situation briefly. We give you a practical view on A1 — and tell you what the client, the site and Zoll are realistically going to expect in your case.