5-Year Working Time Records in Denmark: What to Archive in 2026

For any Polish staffing agency or Danish construction employer sending or receiving workers across the border, working time records in Denmark are not a bureaucratic formality, they are a legal obligation with real consequences. Danish law, shaped by the EU Working Time Directive and reinforced by the landmark Court of Justice of the European Union ruling in the CCOO case, requires employers to maintain objective, reliable, and accessible records of each worker's daily working hours. The retention period is five years. Getting this wrong means exposure to Arbejdstilsynet sanctions, potential disputes with workers, and complications with cross-border social security documentation.

Step 1: Understand Who Is Covered and Why Five Years Matters

The five-year retention obligation applies to virtually all employers operating in Denmark, including Polish agencies that post workers to Danish construction sites under the Posted Workers Directive. Whether your workers are employed directly by a Danish firm or seconded through a Polish agency, Danish working environment rules, administered by Arbejdstilsynet, the Danish Working Environment Authority, govern what records must exist and for how long.

The five-year window is not arbitrary. It aligns with the general limitation period under Danish contract and employment law, meaning a worker can in principle raise a claim about unpaid overtime or rest period violations years after the fact. If you cannot produce records, the burden of proof shifts uncomfortably onto the employer. This is precisely why agencies negotiating cross-border arrangements should pay close attention to record-keeping obligations from day one, and why the terms of any service contract matter enormously. If you are still reviewing your agreements with Danish partners, the article on Contract with a Danish Construction Firm: 7 Clauses a Polish Agency Should Never Sign in 2026 covers several clauses that can create hidden liability around exactly this kind of documentation.

Step 2: Know Exactly What Must Be Archived

This is where many employers get into trouble, not by ignoring the requirement entirely, but by keeping incomplete records. Danish working time rules, rooted in the Working Time Act (Arbejdstidsloven), require that records reflect actual hours worked, not just scheduled hours. The distinction is critical.

Concretely, you must be able to document for each worker and each working day: the start time, the end time, and the total duration of work. Records of rest periods, both daily rest of at least eleven consecutive hours and the weekly rest of at least twenty-four hours, must also be traceable. If a worker regularly performs on-call duties or standby time, those periods require separate documentation that clarifies whether they constitute working time under Danish rules.

Beyond daily logs, you need to retain records of any agreed derogations from the standard working time limits. Under the Working Time Directive, the maximum average working week of 48 hours can be exceeded through individual opt-out agreements, but those agreements themselves must be kept on file for the full five-year period. The same applies to any collective agreements that modify rest period rules on your particular construction site.

What About Polish ZUS and PIP Documentation?

For posted workers, the picture becomes more complex. Polish employers remain responsible for social security contributions through ZUS, and the Polish Labour Inspectorate (PIP) retains supervisory authority over the posting relationship. This means your working time records may need to satisfy two sets of regulators simultaneously. Under Polish labour law (Kodeks Pracy), employers are also required to maintain working time records, and those records feed directly into payroll calculations that ZUS auditors can request. A practical consequence: if your Danish and Polish records tell different stories about the same worker's hours, you face a credibility problem on both sides of the border. More on how this affects wage transparency can be found in the article Pay Rises That Never Reach Workers: Polish Agencies in Denmark 2026.

Step 3: Choose the Right Format for Your Records

Danish law does not mandate a specific technical format, but Arbejdstilsynet expects records to be objective and accessible for inspection at short notice. In practice, this means paper timesheets kept in a binder are legally permissible, but they carry obvious risks: they can be lost, damaged, or altered. Digital systems, whether a dedicated HR platform, a simple spreadsheet, or a construction site app, are far more practical for agencies managing dozens of workers across multiple sites.

Whatever format you choose, the system must allow you to extract a clear per-worker, per-day report covering the full five-year window. Aggregated weekly summaries are not sufficient on their own. Arbejdstilsynet inspectors can and do request granular daily data, particularly when investigating complaints about rest period violations or excessive working hours.

If you use a digital system, ensure that access logs and edit histories are preserved. An inspector who finds that time entries were systematically modified after the fact will draw obvious conclusions. Cloud-based storage with automatic backups is strongly advisable, with access restricted to authorised personnel.

Step 4: Organise Storage and Access Procedures

Storing records is one thing; being able to produce them quickly is another. Designate a named person in your organisation, whether in Poland or Denmark, who is responsible for responding to inspection requests. Arbejdstilsynet can arrive unannounced, and the ability to produce organised, complete records within hours rather than days makes a significant practical difference to how an inspection unfolds.

For agencies posting workers under an A1 certificate, the working time records should be stored alongside the A1 documentation for the relevant posting period. This creates a coherent file per worker that covers both the social security and the working time dimensions of the posting. For more on managing A1 certificates across worker rotations, see Certificate A1 and Worker Rotations: Denmark-Poland 2026.

Consider organising your archive by calendar year and then by worker. Each worker file should contain: the employment or posting contract, the working time records for each day worked, any opt-out agreements, records of leave and absence, and copies of any written communications about working time arrangements. After five years from the end of the relevant employment or posting period, records may be deleted, but not before.

Step 5: Submit to Inspection Requests Correctly

When Arbejdstilsynet requests documentation, respond promptly and completely. Partial responses or delays are treated as non-cooperation and can escalate an otherwise routine inspection. If records are stored in Polish, consider preparing a standard Danish-language summary template in advance, inspectors are not required to work in Polish, and having bilingual summaries ready demonstrates good faith.

For agencies also subject to PIP oversight in Poland, be aware that a PIP inspection request for working time records is a separate obligation from a Danish one. You cannot simply forward Danish records to PIP and consider the matter closed; Polish records must comply with Kodeks Pracy requirements independently.

Common Mistakes to Avoid

The most frequent error is confusing scheduled hours with actual hours. A rota showing that a worker was supposed to work eight hours is not evidence that they actually did. If workers regularly start early or finish late, common on construction sites with variable project demands, your records must reflect reality, not the plan.

A second common mistake is failing to document rest periods. Many employers record start and end times but omit break information entirely. If a worker's records show twelve consecutive hours between start and finish with no documented rest, an inspector will assume those were twelve hours of uninterrupted work, regardless of what actually happened.

Finally, do not destroy records early. Five years means five full years from the end of the employment or posting period, not five years from the date the record was created. A worker who finished a posting in late 2022 has records that must be retained until late 2027.

Actionable Advice for 2026

Start by auditing your current system against the checklist above. Can you produce a daily record for every worker for the past five years? If not, identify the gaps now rather than during an inspection. Move to a digital system with automatic backups if you have not already done so, and designate a clear point of contact for inspection requests. Review your contracts with Danish partners to confirm that responsibility for record-keeping is explicitly allocated, ambiguity here tends to resolve against the agency. And ensure your Polish and Danish records are consistent, because discrepancies between ZUS payroll data and Danish working time logs are exactly the kind of red flag that triggers deeper scrutiny from both Arbejdstilsynet and PIP.