How Staffing Agencies in Poland and Denmark Should Prepare for Changes in 2026

For staffing agencies operating between Poland and Denmark, 2026 is shaping up to be one of the most demanding compliance years in recent memory. Regulatory pressure from both Warsaw and Copenhagen is intensifying, and agencies that have coasted on informal arrangements or incomplete documentation are running out of time to get their houses in order. Whether you manage a handful of posted workers or coordinate hundreds of placements across Danish construction sites, the steps below will help you build a process that holds up under scrutiny.

Step 1: Check Eligibility and Posting Status for Every Worker

The first thing any agency must do is confirm that each worker genuinely qualifies as a posted worker under the EU Posted Workers Directive. This is not a formality. Danish authorities, led by Arbejdstilsynet (the Danish Working Environment Authority), have been coordinating more closely with Polish counterparts to identify arrangements that look like posting on paper but function as disguised local employment. The distinction matters enormously because it determines which country's social security rules apply and whether the worker needs a valid A1 certificate.

In practical terms, this means reviewing the employment contract, the habitual place of work, and the duration of the assignment before any worker crosses the border. For a deeper look at how the A1 certificate process works and what the RUT registration requirement means for Polish workers heading to Denmark, see our detailed breakdown in A1 Certificate & RUT Registration for Polish Workers 2026.

Step 2: Gather the Required Documents Before Departure

Once posting status is confirmed, the documentation checklist becomes the backbone of your compliance process. Polish agencies must ensure that every worker travels with a valid A1 certificate issued by ZUS (Zakład Ubezpieczeń Społecznych), confirming that Polish social contributions apply during the posting period. Without this document, Danish tax authorities at SKAT and labor inspectors can challenge the entire arrangement.

Beyond the A1, agencies need to prepare or verify the following before a placement begins: the written posting agreement between the Polish agency and the Danish client company, payslips demonstrating that the worker receives at least the applicable Danish minimum wage or collective agreement rate, proof of registration in the Danish RUT register (the Register of Foreign Service Providers), and records showing the worker's working time. Polish labor law under the Kodeks Pracy already mandates proper employment documentation, but Danish requirements layer on top of those obligations rather than replacing them.

Step 3: Register in the RUT System and Notify Correctly

RUT registration is mandatory for any foreign company sending workers to Denmark to perform services. The registration must happen before work begins, not after. The Danish Business Authority manages the system, and the information required includes the agency's details, the Danish client's details, and the expected duration of the work. Errors in this step are among the most common reasons agencies face penalties from Arbejdstilsynet. For a clear picture of what those penalties can look like, the article on Fines for Missing Time Registration in Denmark 2026 is essential reading for any compliance officer.

Polish agencies should assign a dedicated person, whether in-house or through a legal partner, to manage RUT notifications. This person needs to track start dates, extensions, and project completions, because the registration must be updated when circumstances change.

Step 4: Implement a Working Time Registration System

This is the area where many agencies are still dangerously exposed. Danish law requires that working time be recorded in a way that is reliable, objective, and accessible. The obligation stems from the EU Working Time Directive as interpreted by the Court of Justice of the European Union in the CCOO ruling, which established that employers must have a system capable of measuring daily working hours for each worker. Denmark has been tightening enforcement of this requirement, and inspectors from Arbejdstilsynet can request records on the spot during a site visit.

For a staffing agency, the practical challenge is that workers are often at client sites where the agency has limited direct oversight. The solution is to build time registration into the contract with the Danish client, making the client jointly responsible for capturing and transmitting accurate records. A hypothetical example: an agency employing thirty workers across several Danish construction sites might use a mobile time-tracking application linked to the agency's payroll system, with the Danish client co-signing weekly summaries. This kind of setup creates an audit trail that satisfies both Danish labor inspectors and the requirements of PIP (Państwowa Inspekcja Pracy), Poland's National Labour Inspectorate, when cross-border inspections occur.

Step 5: Submit Notifications and Wait for Confirmations

After registration and documentation are in place, agencies need a process for tracking confirmation receipts. RUT confirmations, A1 approvals from ZUS, and any correspondence with Arbejdstilsynet should be stored in a centralized file for each placement. Danish inspectors have the authority to request these documents during unannounced visits, and the burden of proof lies with the agency, not the worker or the client.

ZUS processes A1 applications through its online portal, and agencies handling volume placements should consider setting up an employer account that allows batch submissions. Details on current procedures are available directly at ZUS (zus.pl). For questions touching on Polish tax obligations for workers posted abroad, the relevant guidance sits at podatki.gov.pl.

Common Mistakes to Avoid

The most frequent errors agencies make fall into a few predictable categories. Registering in RUT after work has already started is a classic misstep that triggers automatic scrutiny. Allowing A1 certificates to expire mid-assignment without renewal is another, since an expired certificate leaves the worker in a legal grey zone where Danish social contributions may suddenly apply. Failing to update working time records in real time, relying instead on reconstructed timesheets at the end of a project, is something inspectors now treat as a red flag rather than a minor administrative lapse.

Agencies also sometimes underestimate the importance of keeping workers informed. A worker who does not understand what documents they carry or why can inadvertently give incorrect information during an inspection, creating problems that a well-briefed worker would never cause. Investing in a short onboarding briefing for every worker before departure pays dividends that are hard to quantify but very easy to appreciate when an inspector arrives unannounced.

Actionable Advice for 2026

The regulatory landscape between Poland and Denmark is not going to simplify itself. Agencies that treat compliance as a one-time setup rather than an ongoing process will keep finding themselves caught off guard. The practical steps are clear: audit your current worker files for missing or expired documents, assign ownership of the RUT registration process to a named individual, implement a digital working time system that generates records automatically, and build a renewal calendar for A1 certificates tied to each assignment's end date.

Attracting and retaining good workers in this environment also requires more than competitive pay. As explored in Pay Rise Is Not Enough: How Polish Staffing Agencies Attract Workers to Denmark in 2026, workers increasingly choose agencies that demonstrate they have their compliance processes under control, because that signals stability and professionalism. Getting the paperwork right is not just a legal obligation; it is also a competitive advantage. The agencies that understand this in 2026 will be the ones still operating smoothly in 2027.