Vikarbureau w Danii: Legal Contracts with Danish Clients 2026

If you run or plan to run a vikarbureau w Danii, a Polish temporary staffing agency supplying workers to Danish construction or industrial clients, the contractual framework you put in place with your Danish counterpart is not a formality. It is the legal backbone of your entire operation, and getting it wrong in 2026 can expose both you and your client to serious liability under Danish, Polish, and EU law. This guide walks you through each step of the process, from checking whether your business structure qualifies to the moment you receive written confirmation that your arrangements are compliant.

Step 1: Check Whether Your Agency Is Eligible to Operate in Denmark

Before a single contract is drafted, you need to confirm that your Polish legal entity is properly constituted for cross-border service provision. Under EU freedom-of-services rules, a Polish registered company, a spółka z o.o. or jednoosobowa działalność gospodarcza, may post workers to Denmark without establishing a Danish subsidiary. However, you must be a genuine employer in Poland, not a shell created solely to exploit wage differences. The European Court of Justice has consistently scrutinised this distinction, and Danish authorities, including Arbejdstilsynet (the Danish Working Environment Authority), actively coordinate with Polish inspection bodies such as PIP (Państwowa Inspekcja Pracy) to verify genuine employment relationships.

Check that your Polish company holds a valid NIP and REGON, that you pay ZUS contributions for your workers in Poland before the posting begins, and that you can demonstrate a substantial portion of your business activity takes place on Polish territory. If you are unsure about ZUS obligations during a Danish posting, the detailed breakdown in our article on ZUS Contributions for Seasonal Construction Workers in Denmark 2026 is a practical starting point.

Step 2: Gather the Required Documents Before Any Contract Is Signed

Your Danish client will almost certainly ask for documentary proof before committing to a service agreement. At a minimum you should prepare: a current extract from the Polish business register (KRS or CEIDG), a ZUS certificate confirming social insurance coverage for the posted workers (the A1 portable document), your Polish VAT registration, and proof of a Polish business address where genuine management decisions are taken. On the Danish side, your client needs their own CVR number and, ideally, written confirmation that they are covered by a relevant collective agreement or sectoral arrangement, because this directly affects the wage floor your workers are entitled to under the Danish implementation of the EU Posted Workers Directive.

Step 3: Draft the Two Core Contracts

Operating legally as a vikarbureau w Danii requires two distinct written agreements, and conflating them is one of the most common mistakes agencies make.

The Commercial Service Agreement with the Danish Client

This is the B2B contract between your Polish agency and the Danish user company. It must specify the scope of services, the duration of each worker's assignment, the hourly or daily rate the client pays your agency, invoicing terms, and, critically, a clause confirming that the client will provide your workers with the same basic working conditions (working time, rest periods, minimum pay) as those applicable to directly employed workers under Danish rules or the relevant collective agreement. Without this clause, your Danish client risks joint liability for wage shortfalls. The contract should also name the Danish client as the party responsible for day-to-day health and safety supervision on site, in line with obligations under Arbejdstilsynet regulations.

The Individual Employment Contract with Each Posted Worker

Each worker must receive a written employment contract governed by Polish Kodeks Pracy (the Labour Code), supplemented by a posting addendum that states the host country, the expected duration of the posting, the currency and method of payment, any allowances or benefits specific to the Danish assignment, and the applicable Danish minimum conditions. This addendum is not optional, it is a direct requirement of the EU Posted Workers Directive as transposed in both Poland and Denmark. For agencies sending students or young workers to construction sites, the checklist in our guide on Polish Students on Danish Construction Sites: Agency Checklist 2026 covers additional obligations specific to that group.

Step 4: Register with the Danish RUT System

Before your first worker sets foot on a Danish site, your agency must register in the RUT (Registret for Udenlandske Tjenesteydere), the Danish register of foreign service providers. Registration is done online through the portal operated by the Danish Business Authority. You will need your Polish company details, the CVR number of your Danish client, the planned start and end dates of the assignment, and the names and A1 document numbers of the posted workers. Failure to register, or registering after work has already begun, is one of the most frequently cited violations found during Arbejdstilsynet inspections, and it can result in fines imposed on both the agency and the Danish client.

Pay close attention to wage supplements when calculating what you owe your workers during the Danish posting. Danish construction collective agreements include a range of mandatory additions to the base rate, and misunderstanding these is a common source of disputes. Our article on Tillaeg on Danish Construction Sites: Mandatory Pay Supplements 2026 explains exactly which supplements apply and how they are calculated.

Step 5: Submit Documents and Wait for Confirmation

Once RUT registration is complete, keep a copy of the confirmation receipt and share it with your Danish client. Some Danish user companies, particularly larger contractors, will also require you to submit your workers' A1 certificates and employment contract addenda before the assignment starts. Build this into your standard onboarding process rather than treating it as an exception. The RUT system does not issue a formal approval decision, registration itself is the legal act, but Arbejdstilsynet may follow up with an inspection, especially on construction sites, so having all documents organised and immediately accessible is essential.

Common Mistakes to Avoid

Agencies operating as a vikarbureau w Danii repeatedly encounter the same pitfalls. Registering in RUT late, or not at all, is the most frequent. Equally damaging is signing a commercial agreement with a Danish client that says nothing about applicable wage conditions, leaving the agency exposed when a worker later files a complaint with PIP or the Danish labour inspectorate. Using a single generic employment contract without a country-specific posting addendum is another error that courts on both sides of the border have penalised. Finally, failing to maintain A1 certificates for every posted worker, obtainable from ZUS in Poland before departure, can result in double social insurance contributions being claimed, a costly and time-consuming dispute to resolve.

Actionable Advice for 2026

Start with the paperwork, not the placement. Before you agree a start date with your Danish client, confirm that your ZUS contributions are current, that A1 applications have been submitted, and that your RUT registration is ready to go live the moment the contract is signed. Have a Polish labour lawyer review your commercial service agreement template at least once a year, because both Danish collective agreements and EU posted-workers rules are updated regularly. Keep digital copies of all contracts, registration confirmations, and wage records for at least five years, this is the standard audit window applied by both Arbejdstilsynet and PIP during cross-border investigations. A well-documented agency is not just a legally safe one; it is also a far more attractive partner for serious Danish construction companies looking for reliable, compliant subcontractors.