What “posting of workers” from Romania to Denmark actually means
Posting workers is not the same as hiring employees directly in Denmark. In EU law, including between Romania and Denmark, posting means that a Romanian company temporarily sends its own employees to carry out work in Denmark while the employment relationship remains with the Romanian company. The worker is not transferred to a Danish employer, and in principle the Romanian contract and social security continue, but Danish rules on minimum pay and working conditions partly apply.
This distinction is fundamental because it determines nearly everything else: which country's labour law applies, where social contributions are paid, which registrations must be made in Denmark, and when Danish tax becomes payable. Misunderstanding this difference is one of the most common sources of problems for Romanian firms and their Danish clients.
Legal framework: EU rules, Danish law and Romanian obligations
The posting of workers between Romania and Denmark is governed by several layers of regulation that interact:
At EU level, the Posting of Workers Directive and its amendments require that posted workers enjoy a “core” of host-country conditions, especially on pay, working time, holidays, health and safety, and non-discrimination. The rules were tightened in recent years to reduce unfair wage competition and “social dumping”, particularly in construction and low-wage sectors.
Social security coordination is mainly handled by Regulation (EC) 883/2004 and its implementing regulation. These allow Romanian workers posted to Denmark to remain under the Romanian social security system for a limited period, on the basis of the A1 certificate issued by the Romanian authorities.
On the Danish side, the key elements come from the Danish Posting of Workers Act, the Registration of Foreign Service Providers (RUT) scheme, Danish tax legislation, and – very importantly – sectoral collective bargaining agreements, especially in construction, industry, cleaning, transport and agriculture. Denmark is a highly collective-agreement-driven labour market. Even when legislation is silent, collective agreements effectively set the minimum standards that foreign service providers are expected to follow.
Romanian firms must comply simultaneously with Romanian labour law, social contribution rules, and reporting to the Romanian authorities, for example when applying for A1 certificates. Failing to coordinate the requirements in both countries is a recurrent difficulty.
Step-by-step: how a Romanian company prepares to post workers to Denmark
The process is easier to manage if it is broken down into clear stages. A typical sequence looks like this:
First, the Romanian company assesses whether the planned activity in Denmark truly qualifies as posting and not as establishment of a permanent Danish branch or hiring-out of labour. Indicators include where the company has its main business, who bears the commercial risk, who directs and controls the work daily, and how long the assignment will last. If the Romanian company has almost no real activity at home and all work is carried out in Denmark for one client, Danish authorities may regard it as “letter-box” posting, with serious consequences.
Second, contracts should be structured carefully. There are two contracts to consider: the commercial contract between the Romanian firm and the Danish client, and the individual employment contracts with the workers. The commercial contract should clarify that the Romanian firm retains employer authority and responsibility. Employment contracts must remain valid under Romanian law and should be amended or supplemented to reflect the posting period, working location, allowance structure, accommodation arrangements and travel provisions.
Third, the company applies for A1 certificates from the Romanian National House of Public Pensions for each posted worker. This is proof that social contributions will continue to be paid in Romania, normally for up to 24 months. Without A1, Denmark may claim Danish social contributions, creating double payment risks.
Fourth, before work begins in Denmark, the company must register in the Danish RUT system (Register for Udenlandske Tjenesteydere). Registration is mandatory in almost all sectors and must typically be done online, providing data on the company, the Danish client, the place of work, dates, business area and the posted workers. Failure to register can lead to fines per worker and per day.
Fifth, the firm should identify whether a relevant Danish collective agreement exists for the sector and geographic area. In construction, for example, the major agreements are concluded by 3F and employer organisations. Often, Danish clients will insist contractually that the Romanian company adheres to the applicable agreement, including minimum pay, overtime, pension, and allowances. Understanding these costs upfront is critical to pricing the project correctly.
Finally, tax and payroll arrangements must be mapped. Typically, Danish work days create Danish income tax obligations, even when social security remains in Romania. The workers may need Danish tax numbers, and the Romanian employer may have withholding obligations. Early contact with a tax adviser familiar with Danish-Romanian situations can prevent later disputes.
Key requirements during the posting period
Once the posting begins, the Romanian employer must ensure that working conditions in Denmark meet at least the Danish minimum standards. Under EU rules and Danish practice, this “core” minimum usually covers pay, including bonuses and certain allowances, maximum working hours and minimum daily and weekly rest, paid annual holidays, health and safety at work, including site safety rules, equal treatment and anti-discrimination and where relevant, conditions for accommodation provided by the employer and allowances for travel, board and lodging.
Minimum pay is often the most sensitive point. Denmark does not have a statutory minimum wage set by law, but collective agreements are treated in practice as the baseline. In construction, for example, collective agreements may foresee hourly minimums that are significantly higher than Romanian wages – often exceeding 125–150 DKK per hour for skilled workers, though rates vary by trade, seniority and region. Allowances for work away from home, travel, and daily expenses may be additional.
The employer must also keep certain documents available in Denmark, often at the workplace or electronically: copies of employment contracts, payslips, working time records, proof of wage payments and A1 certificates. Danish authorities and trade unions can request these during inspections or negotiations. Not having documentation ready can trigger presumptions against the employer in disputes.
When does posting become something else? Duration and “permanent” presence
EU social security rules allow posting for up to 24 months under an A1 certificate, but that does not automatically mean the arrangement is treated as temporary in all respects. If the Romanian company systematically renews postings or rotates workers through the same Danish site over several years, Danish authorities may argue that the firm has effectively created a stable presence – a permanent establishment or at least a long-term operation in Denmark.
This has several implications. For labour law, the longer and more integrated the work, the stronger the expectation that Danish rules and collective agreements are followed in full, not just the minimal posting package. For tax, a permanent establishment may lead to Danish corporate tax on profits generated in Denmark. For social security, renewal of A1 certificates is not automatic. Authorities may refuse if the situation no longer qualifies as temporary.
Compared with classic short-term postings of a few months for a defined project, these long-term or repeated arrangements are much more scrutinised. Romanian companies must therefore be realistic about how long the project will last and how integrated they will become in the Danish market.
Romanian employer vs. Danish hiring company: who is liable for what?
The Romanian employer remains responsible for complying with Romanian law, for the employment relationship, and for ensuring that Danish minimum standards are respected. However, Danish law increasingly introduces forms of joint or chain liability to protect workers from underpayment.
In many sectors, Danish client companies may be held liable, together with the foreign subcontractor, for unpaid wages according to collective agreements. Trade unions often pursue claims directly against the Danish contractor because it is easier to enforce. As a result, Danish companies are cautious when choosing Romanian partners and may require documentation of wage payments, collective agreement adherence and RUT registration before making payments.
From the Romanian company's perspective, this dual liability is a mixed blessing. On the positive side, clear contractual obligations with the Danish client can help structure compliance and share certain administrative tasks. On the negative side, Danish clients may impose strict contractual penalties, retention of payments, and extensive reporting duties, increasing the administrative burden.
Common problems Romanian companies encounter in Denmark
A first widespread problem is underestimating Danish wage levels and total labour costs. Romanian firms often calculate bids using home-country wage structures, adding only a small premium. Once they face Danish collective agreement demands, higher hourly rates, holiday pay, pension contributions and allowances, the project may become unprofitable, leading to pressure to cut corners or disputes with workers and unions.
Second, incomplete or late RUT registration and missing documentation lead to fines and reputational damage. Statistics from Danish authorities show thousands of RUT registrations annually and a significant number of fines for non-compliance, especially in construction and cleaning. The fines are not symbolic; they can reach tens of thousands of Danish kroner in serious or repeated cases.
Third, confusion around A1 certificates and social security is frequent. Some companies start work in Denmark without applying for A1, assuming it can be sorted out later. If Danish authorities then treat the workers as insured in Denmark, double contributions or retroactive assessments can arise. Workers may also find that their periods abroad are not recognised in Romania for pension purposes if the documentation is inconsistent.
Fourth, language and cultural barriers complicate communication with Danish clients, unions and authorities. Important letters or emails may be ignored because they are not understood, leading to missed deadlines in complaint or appeal procedures. Written procedures, such as time registration or safety instructions, can be misunderstood by workers if not translated.
Finally, the relationship with Danish trade unions can be challenging. Unions in Denmark are active in monitoring foreign companies and are not hesitant to use industrial action – such as blockades – to force adherence to collective agreements. Romanian companies unprepared for this style of negotiation can feel pressured or threatened, although in practice unions also function as a source of guidance on correct wage levels and conditions.
Advantages and disadvantages of posting compared with other options
Posting is only one way to operate in Denmark. Romanian businesses considering cross-border work usually compare at least three models: posting employees from Romania; establishing a Danish subsidiary or branch and employing locally; or acting as an individual contractor or using self-employed workers.
Posting's advantages include the ability to keep the payroll and HR structure in Romania, continued affiliation to Romanian social security for up to 24 months, potentially simpler internal management when working on short, clearly defined projects, and the possibility to use existing Romanian teams with known skills and cohesion. These aspects often make posting attractive for initial market entry or for temporary surges of work.
On the other hand, disadvantages become clear as projects grow. Administrative complexity increases because the company must comply simultaneously with Romanian and Danish rules. Wage differences and collective agreement demands may erode cost advantages. The risk of misclassification, fines and disputes is significant if the rules are not fully respected. Long-term operations through posting can appear artificial to authorities, raising tax and social security challenges.
Establishing a Danish subsidiary and employing workers under Danish law generally involves higher direct labour costs but provides legal certainty and simpler relations with Danish clients and unions. It can be more sustainable for continuous or large-scale activity. The self-employed route, using “independent contractors” from Romania, is often promoted as flexible and cheap, but it carries a high risk of being reclassified as disguised employment by Danish authorities, triggering back payments and penalties. In practice, for serious operators, the strategic choice is usually between properly structured posting and full establishment in Denmark.
Practical strategies to minimise risks and disputes
Romanian companies can significantly reduce problems by investing in preparation and documentation. Before signing any Danish contract, obtaining a realistic simulation of total labour costs under the relevant collective agreement helps avoid unprofitable bids. Written internal guidelines for postings – covering RUT registration, A1 application, wage calculation, travel and accommodation standards, and communication lines with the Danish client – ensure consistency.
On-site, systematic time registration in a format acceptable in Denmark, clear payslips that distinguish basic pay, overtime and allowances, and bank payment of wages create an audit trail that can quickly defuse accusations of underpayment. Training a bilingual coordinator – either Romanian-Danish or Romanian-English – to handle communication with unions and authorities is highly valuable.
Cooperative but firm dialogue with Danish trade unions can turn a potential source of conflict into a working relationship. Unions often prefer compliance and long-term cooperation to confrontation, especially when foreign companies show willingness to respect standards and correct mistakes promptly.
Key takeaways for Romanian businesses considering Denmark
For Romanian companies, Denmark represents an attractive but demanding market. Wages are high, but so are expectations regarding quality, safety and workers' rights. Posting workers can be an efficient model when projects are genuinely temporary and well-defined, and when the company is willing to invest in understanding Danish rules and practices.
Ignoring or minimising Danish requirements is rarely a winning strategy. The probability of inspections, union involvement or complaints is considerable, particularly in sectors known for cross-border labour. On the other hand, firms that approach posting methodically, document everything and budget realistically often build strong reputations and long-term partnerships in the Danish market.
Staying informed is vital, as rules and interpretations evolve. Monitoring guidance from Romanian authorities on A1 certificates, from Danish ministries on posting and RUT, and from sectoral employer organisations and unions helps avoid surprises. When in doubt, early professional advice is usually less expensive than trying to repair the damage after a dispute has escalated.
If the posting process is treated as a structured project – with clear preparation, careful execution and thorough documentation – Romanian employers can navigate the complexity and make Danish assignments a stable and predictable part of their international activity.
FAQ – Posting workers from Romania to Denmark
Q1: How long can Romanian workers be posted to Denmark under an A1 certificate?
A1 certificates typically cover up to 24 months of posting, provided the work is genuinely temporary and the Romanian company continues significant activity in Romania. Extensions are possible only in limited, justified cases and require approval from both countries' authorities.
Q2: Do posted Romanian workers have to be paid the same as Danish workers?
They must receive at least the pay and core conditions set by applicable Danish collective agreements or laws for the job in question. In practice, this often means wages close to those of Danish colleagues performing similar work, including allowances and certain benefits.
Q3: Is RUT registration mandatory for all postings to Denmark?
In most cases, yes. Foreign service providers sending workers to Denmark must register in the RUT database before work starts, and update the data if conditions change. Some narrow exceptions exist, but construction and most manual or service activities are covered.
Q4: What happens if a Romanian company fails to comply with Danish posting rules?
Consequences may include administrative fines, claims for back pay and benefits from workers or trade unions, possible industrial action, and in serious or repeated cases, tax and social security reassessments. Danish clients may also terminate contracts or withhold payments if compliance is not demonstrated.