Posting Workers Abroad: A1, Notification and OSH

You land a contract on a site near Berlin. Good rate, your crew ready to go, materials ordered. They get into the van, cross the border - and here the second construction site begins, the paperwork one. Because posting a worker abroad is not "they've gone and they're working". It is an A1 certificate from ZUS (Polish social insurance), a posting notification in the host country, minimum pay conditions of that local market and - something many forget - OSH (occupational safety and health), which is still your duty, only now at the meeting point of two legal systems. An inspection there can be brutal: no A1 means back-payment of contributions and penalties. In this article I go through what you must have before the van sets off. BudoReady packages give you OSH documentation that travels with the crew and works abroad too.

Key points in brief

• The A1 certificate from ZUS confirms that the worker is subject to Polish social insurance while working abroad - without it the host country may demand contributions be paid there.
• Posting within the EU is governed by the Posted Workers Directive - the rule of equal pay for the same work in the same place applies (host-country conditions).
• You usually have to notify the posting in the host country's system (e.g. in Germany, France) before the work begins.
• OSH remains your duty - training, examinations and the risk assessment still bind you, and on a foreign site local requirements are added.
• No A1 or notification is a real risk: back-payment of contributions, financial penalties and problems at the local labour inspection.

What posting is and when we talk about it

Let's start with the term, because it gets confused. Posting is the situation in which your Polish firm sends a worker to perform work in another EU/EEA country for a defined time, in the course of providing services - e.g. you deliver a construction contract abroad with your own crew. The worker remains employed by you, but physically works in Germany, France, the Netherlands or wherever you go.

It is not the same as an ordinary business trip, nor as being hired on the spot by a foreign firm. Posting has its own rules - and those rules have to be met before departure, not after the first inspection. The three pillars are: A1 (insurance), posting notification (registration in the host country) and terms of employment in line with that local market.

The A1 certificate - the basis of the whole puzzle

This is document number one. The A1 certificate is issued by ZUS and confirms that during the period of work abroad the worker remains subject to the Polish social insurance system. Without the A1 the rule is simple and costly: the country where the worker actually works may decide that the contributions are due there - and that means double or back-dated contributions and penalties.

What you need to know about the A1:

• you apply for the A1 to ZUS (the appropriate form, e.g. US-3/US-1 depending on the situation) - ideally before starting work abroad;
• the A1 is issued for a specific worker for a defined period of posting;
• a foreign inspection may demand the A1 be shown on the spot - the worker should have it with them (on paper or digitally);
• there are conditions to be met for the posting to be recognised (among others, that the firm normally conducts business in Poland and that the posting is temporary).

In short: the A1 is your entry ticket. Without it everything else falls apart, because the first inspection abroad will ask precisely for that paper.

The posting notification and terms of employment

The second pillar is the registration of the posting in the host country. Most EU states require posted workers to be notified before the work begins, in a dedicated system - in Germany, for construction work, it is reported to the customs administration; in France the SIPSI system operates; other countries have similar arrangements. Added to that is often the obligation to designate a contact person and to keep documents on site.

The third pillar is the terms of employment. Under the EU Posted Workers Directive the rule of "equal pay for the same work in the same place" applies. This means your worker abroad must be guaranteed at least the local minimum conditions - the rates arising from the local regulations or collective agreements (in construction often higher than the ordinary minimum wage), working time, allowances. You cannot pay "Polish rates" for work on a German site.

The three pillars of posting - a table

Let's gather it in one place, so nothing slips past you before the crew departs.

Pillar	What you have to do	Who / where
Insurance	Obtain an A1 certificate for each posted worker, before departure	ZUS (application)
Posting registration	Notify the posting in the host country's system before the work begins	E.g. customs administration (DE), SIPSI (FR)
Terms of employment	Ensure the local minimum conditions: pay, working time, allowances	Posting Directive + the country's regulations
OSH	Maintain training, examinations, risk assessment; account for local site requirements	Polish regulations + host-country requirements

OSH in posting - it does not disappear, it just gets more complicated

This is the part many contractors overlook, because they focus on the A1 and the rates. Posting does not release you from OSH obligations. Your workers still have to have current OSH training, valid medical examinations (with the work-at-height annotation if they go up on scaffolding) and a risk assessment for the workstation. All of this should travel with the crew - ideally in a folder that can be shown on the spot.

On a foreign site local requirements are added: the rules of the specific site, the general contractor's requirements, sometimes local regulations on equipment or qualifications. If you work as a subcontractor to a foreign contractor, the rules on OSH coordination between firms also come in - just as on a Polish site, we described it in the article on OSH responsibility in a contract with a subcontractor.

A practical tip: before the van sets off, check each worker's folder as if there were to be an inspection tomorrow - because abroad there may be. Current examinations and training are not a "Polish matter" that stays at home. We described how to organise them in the articles on medical examinations and OSH training cards.

What the gaps cost you - and why it is dearer than at home

Posting inspections abroad can be tough, because the local inspectorate guards its own labour market. The most common consequences of gaps:

• No A1 - a demand to pay contributions in the host country, arrears and penalties; plus a correction of the accounts in Poland.
• No posting notification - financial penalties imposed by the local authorities, often severe.
• Underpaid wages - claims for a top-up to local rates plus sanctions.
• OSH gaps - problems on entering the site and at the local labour inspection, and in an accident - liability as at home.

Remember too that the Polish PIP (Polish Labour Inspectorate) does not disappear from view either - and from 8 July 2026 the PIP reform strengthens inspectors' powers, including on the legality of employment and posting. A firm that takes crews abroad should keep this topic exceptionally clean.

Frequently asked questions

Do I have to have the A1 before departure, or can I fill it in later?

The A1 certificate is best obtained before starting work abroad. A foreign inspection may demand the A1 be shown on the spot, and its absence during an inspection means the risk of a demand for contributions in the host country and penalties. The application is submitted to ZUS in advance - do not leave it to the last minute.

Is a posted worker due the Polish or the foreign rate?

Under the EU rule of equal pay for the same work in the same place, a posted worker must receive at least the local minimum remuneration conditions of the country in which they work - in construction often arising from collective agreements and higher than the ordinary minimum wage. They cannot be paid solely at Polish rates.

Do Polish OSH training and examinations apply during posting?

Yes. Posting does not release you from OSH obligations - your workers must have current OSH training, valid medical examinations and a risk assessment. It is worth carrying the documentation with the crew. In addition, on a foreign site local safety requirements apply, as well as the rules of the specific site and the general contractor.

Can I post a worker from Ukraine employed in Poland to another EU country?

Posting a third-country national (e.g. from Ukraine) legally employed in Poland to another EU country is possible, but it requires additional conditions to be met - among others, the legality of employment and residence, and often separate host-country requirements for non-EU workers. This is a topic worth verifying individually before departure, because the rules can be more restrictive than for EU nationals.

Let the documentation travel with the crew - the STANDARD and FULL packages

The A1, notifications and rates you handle with ZUS and the host country's systems - but the OSH that has to travel with the van you prepare once and carry with the crew. In the STANDARD package (449 zł, 27 files) you have a full set: risk assessments, training cards, referral templates and an examinations register, instructions - tailored to PKD 43 (Polish business activity code). This is the folder you want in order before the crew crosses the border.

If you also want the full package for reacting to inspections and accidents - useful for work abroad too - choose FULL (749 zł, 45 files). The documents are in a PL and UA version, so you can communicate with the whole crew, including those posted from Ukraine. The promotion runs until 7 July 2026 - just before the PIP reform comes into force.

See BudoReady packages and get the crew ready to travel →

The takeaway is simple. Posting abroad is a good contract and a good rate - but only when the paperwork side is as solid as the work. An A1 from ZUS, a notification in the host country, local pay conditions and OSH that travels with the crew. Sort it out before departure and the van sets off calmly. Leave it for later, and the first foreign inspection will show you what "it'll be fine" costs in a foreign language.

This article is for information only and does not replace individual legal or tax advice or a consultation with an OSH specialist. The rules on posting and the requirements of host countries can be detailed and changeable - the current legal position and the specific requirements of a given country should be verified as at the date of use.