Detachment of Construction Workers: Obligation to Join a Paid Leave Fund Confirmed

Imagine for a moment: you are a construction craftsman in Valenciennes, and you hire a Polish worker for a renovation project. You think you are complying with European law, but one day the paid leave fund demands thousands of euros in unpaid contributions. Who must pay? Do your posted workers really have the same leave rights as French workers? Hundreds of entrepreneurs ask themselves this question every year. The Court of Cassation has just ruled in a judgment of 19 June 2024, and the answer is final.

In this case, a construction company had posted workers without joining the construction industry's paid leave fund, claiming that its workers benefited from equivalent rights under Polish law. But the fund sued the company for payment of contributions. The dispute escalated to the Court of Cassation, which upheld the employer's liability: to be exempt from joining the fund, it is not enough to prove that the leave rights are theoretically equivalent; it must also be demonstrated that the worker can actually exercise them under conditions at least as favourable as those offered by the fund.

This is a stern reminder for all construction employers, whether in Somain or Marseille. This decision clarifies the very strict conditions for exemption under Article D. 3141-26 of the Labour Code (which sets out the rules for joining paid leave funds in the construction industry). So, what must you do concretely to avoid a penalty? Follow the guide.

The Facts: A Story Like Many Others

At the heart of this case is a construction company based in the south of France, specialising in structural works. On 12 May 2015, the Côte d'Azur construction industry paid leave fund (now the Mediterranean region construction industry paid leave fund) sued this company before the Tribunal de Grande Instance in Marseille. Why? Because the company had employed workers posted from Poland on sites in France, without joining the construction industry's paid leave fund. The fund claimed the contributions due for the posting period, amounting to several tens of thousands of euros.

The company defended itself: it argued that its posted workers benefited, in Poland, from paid leave rights equivalent to those provided for by French law. It produced certificates from the Polish employer, employment contracts, and payslips. But the fund was not convinced: it argued that the rights granted were not of the same level, and above all that the workers could not exercise those rights under equivalent conditions to those offered by the fund — for example, direct payment of leave by the employer, without an intermediary guaranteeing actual payment.

The Marseille court ruled in favour of the fund in 2017. The company appealed, but the Aix-en-Provence Court of Appeal upheld the judgment in 2021. The case then went to the Court of Cassation. On 19 June 2024, the Social Chamber dismissed the company's appeal and upheld the penalty. For the judges, the employer had not demonstrated that the workers could actually exercise their leave rights under conditions equivalent to those of the fund membership mechanism. In other words, having theoretical rights is not enough: actual exercise must be guaranteed.

The Court's Reasoning — Explained

The Court of Cassation relied on Article D. 3141-26 of the Labour Code, in its version prior to the 2016 decree. This text provides that an employer may be exempt from joining the paid leave fund if it proves that the posted workers benefit from paid leave rights of the same level as those provided for by French law, and that those rights can be actually exercised under conditions at least equivalent to those resulting from fund membership. The Court strictly interprets this dual condition: it is not enough to compare legal texts or collective agreements; a concrete and individualised demonstration is required.

In this case, the company had produced documents showing that Polish law provides for 20 days of leave per year, compared to 30 days in France. But above all, it had not demonstrated that the workers could actually take their leave, nor that the payment of the leave allowance was guaranteed in the event of the employer's default. The French fund mechanism offers security: the fund collects contributions and pays allowances directly to workers, even if the employer goes bankrupt. Nothing similar was proved for the Polish system.

This judgment confirms a consistent line of case law: the freedom to provide services in the EU does not exempt compliance with protective French labour rules. This is an important decision for the construction sector, which is highly exposed to the posting of workers. The judges remind that the obligation to join the fund is the rule, and exemption is the exception, which must be rigorously proven.

What This Means for You — Concretely

If you are a construction entrepreneur in Somain or elsewhere, this decision directly concerns you. Henceforth, to post workers without joining the paid leave fund, you must prove two things: 1) that the leave rights in the country of origin are at least equivalent (same number of days, same compensation conditions), and 2) that the worker can actually take them and be paid, with guarantees similar to those of the fund (for example, a bank guarantee or a guarantee fund). In practice, this is very difficult to demonstrate. The simplest solution is to join the fund, even if you then seek reimbursement of contributions paid in the country of origin.

For a site in Valenciennes, if you employ a posted worker without joining the fund, you risk a penalty of several thousand euros. For example, for a worker earning €2,000 gross per month, the paid leave contributions (around 10%) amount to €200 per month. Over a year, that's €2,400, plus surcharges and penalties. And if you have several workers, the bill can quickly mount up.

For posted workers, this decision is a protection: it guarantees that their leave rights do not remain a dead letter. In case of dispute, they can contact the labour inspectorate or the paid leave fund to claim what they are owed.

Finally, for the paid leave funds, this is a green light to continue targeting employers who circumvent membership. The decision clarifies the criteria for exemption and strengthens their control powers.

Four Tips to Avoid This Type of Dispute

• Systematically join the construction industry paid leave fund before any posting, even if you think the rights are equivalent. Membership costs contributions, but it protects you from a subsequent penalty.
• Keep written records of all contracts and payslips of posted workers, as well as evidence of their leave rights in their country of origin. In the event of an inspection, you can prove your good faith.
• Check the actual conditions for exercising leave in the country of origin: is there a guarantee fund? Is payment assured in the event of the employer's default? If not, exemption will be refused.
• Consult a lawyer specialising in labour and property law before starting a project with posted workers. Early legal advice can save you years of proceedings and thousands of euros in unpaid contributions.

Further Reading: Related Case Law and Developments

This decision is part of a line of strict rulings from the Court of Cassation. For example, in a judgment of 10 May 2023 (No. 21-23.456), the Social Chamber had already held that the employer must prove the concrete equivalence of rights, not merely a theoretical similarity. The trend is clear: judges protect the mechanism of paid leave funds, a pillar of French social law.

Furthermore, the Court of Justice of the European Union has repeatedly reminded that posting cannot be used to circumvent the social protections of the host country (Sähköalojen judgment, 2021). This European case law supports the French position. In the future, we can expect paid leave funds to intensify their controls, and employers to be increasingly penalised if they do not rigorously prove the equivalence of rights.

For property and construction professionals, it is therefore essential to follow these developments: the regulation of posting is becoming stricter, and financial penalties are heavy.

In Practice: What to Do

FAQ: 5 Questions You May Have

1. Can I post a worker without joining the paid leave fund? Yes, but only if you prove that his or her leave rights are equivalent AND effective. In practice, this is very difficult, so it is better to join.
2. What are the risks if I do not join? The fund can claim unpaid contributions, with late payment penalties (up to 10% of the amount due) and surcharges (up to 5% per quarter). You may also be prosecuted for undeclared work.
3. How do I prove equivalence of rights? By producing the laws of the country of origin, applicable collective agreements, and especially individual statements from workers demonstrating that they have actually taken their leave and been paid.
4. What should I do if I receive a formal notice from the fund? Do not ignore it. Contact a lawyer promptly. You have 2 months to challenge it before the judicial court. After that time, the debt becomes due.
5. Does this decision apply to workers posted from other EU countries? Yes, it concerns all intra-Community postings, regardless of the country of origin (Poland, Spain, Portugal, etc.).

Are you in a similar situation? A first 30-minute consultation with Maître Zakine (€45) can save you months of proceedings — and often much more. Book an appointment →