Luxembourg employment contracts: what the law requires

A Luxembourg employment contract has to be in writing, drawn up individually for each employee, and signed in two originals so that each party keeps one, at the latest at the moment the employee enters service. There is no grace period. The Inspection du travail et des mines (ITM) attaches the rule to Article L.121-4 of the Code du travail.

That article lists what the document carries: the identity and addresses of the parties; the date the contract takes effect; the place of work, or, where there is no fixed one, the principle that the employee works at various places, with the employer’s registered office; the job title, the category and the tasks; normal daily or weekly working time, the overtime arrangements and the normal work schedule; remuneration, with the basic salary, the index cote in force and every supplement, bonus and gratification shown separately, and the payment frequency; paid annual leave; the notice each side must give; the length and terms of any probation period; any supplementary or derogating clauses, which have to be more favourable to the employee; the applicable collective agreement and the body that concluded it; the social security bodies collecting contributions and any régime complémentaire de pension; and the training the employer provides. Leave, notice, the collective agreement, the social security bodies and training may be covered by reference to the law or agreement that governs them.

Since the Law of 24 July 2024 the core items, the parties through to the probation period, must also reach the employee within seven calendar days of the start, and the rest within a month. Non-compliant information is fined per employee affected, from €251 to €5,000, so one template fault across a team multiplies. Our step-by-step guide to hiring in Luxembourg sets out where the contract sits in the sequence.

Luxembourg prescribes no language for the employment contract itself. The ITM’s published position is that it may be drawn up in any language understood by both contracting parties, so an English contract is valid where the employee genuinely reads English. The test is comprehension, and the same standard applies to a dismissal letter.

The exposure runs the other way. A contract written in a language unknown or virtually unknown to the employee can be declared void for defect of consent, which the ITM grounds in Article 1109 of the Civil Code, so the employer has to be able to show the employee understood.

English stops at the administration. Luxembourg’s three administrative languages are French, German and Luxembourgish, under Article 3 of the Law of 24 February 1984 on the language regime, and English is not among them. The Centre commun de la sécurité sociale (CCSS) publishes its entry and exit declarations only in French and German, and the main returns of the Administration des contributions directes (ACD) exist in the same two languages. Before the Tribunal du travail, documents in other languages may in principle need translating into French, although English exhibits are often admitted in practice.

The market answer for an international employer is a bilingual contract: English and French in parallel, with a governing-language clause naming the version that prevails if the two diverge, usually the French one. That is practice rather than law, and the clause does less than it looks. It settles a discrepancy between the two texts; it does not displace the 1984 Law for filings or court documents.

The contrat à durée indéterminée (CDI, the open-ended contract) is both the default and the residual category: a contract that is not validly something else is a CDI. The contrat à durée déterminée (CDD, the fixed-term contract) is available only for a precise and non-durable task, and may not fill, on a lasting basis, a post connected with the normal and permanent activity of the business.

The permitted grounds the ITM lists include replacing an employee who is temporarily absent or suspended, holding a vacant CDI post until the permanent successor arrives, seasonal work, sectors where fixed terms are customary such as audiovisual work and professional sport, a temporary and exceptional rise in activity, urgent work to prevent accidents, and hiring a jobseeker registered with ADEM. A striking employee may not be replaced this way, nor a shortfall caused by economic or weather conditions covered.

A CDD runs for 24 months at most, renewals and any probation included, and it may be renewed twice. The renewal has to be provided for in advance, by a clause in the original contract or by an avenant; renew without one and the contract is treated as a CDI. Seasonal contracts are capped at ten months in any twelve; research contracts may run to 60. Beyond the Article L.121-4 particulars, it states the reason for the fixed term, the end date or a minimum duration, the name of the replaced employee where that is the ground, any probation period and the renewal clause. A waiting period equal to one third of the expired contract has to elapse before the same post is filled with a new CDD.

Break those limits and the employee can have the contract requalified as a CDI. The triggers the ITM lists include a fixed term used for a permanent post in the normal activity of the business, a task that is not precise and non-durable, no writing when work begins, no end date and no minimum duration, the 24-month ceiling passed, renewal with no renewal clause, and a third renewal. Leaving out one of the mandatory particulars does not by itself cause requalification, and only the employee can invoke it. For the employer that means losing the end date: the contract then ends only by resignation, by dismissal with statutory notice on real and serious grounds, or by agreement, under the rules in our guide to ending employment in Luxembourg. Where a CDD runs its course and the parties carry on under a CDI, no new probation may be imposed and seniority carries over.

Probation in Luxembourg is optional, has to be agreed in writing at the latest at the moment the employee enters service, and lasts a minimum of two weeks. The maximum depends on the employee: three months below CATP/DAP qualification level, six months at that level or above, and twelve months where the contracted gross monthly salary reaches the statutory threshold, which the ITM puts at €5,318.41 at the index of 992.24 in force since 1 June 2026. That threshold is index-linked, so check the current figure before writing twelve months into an offer.

One probation period is allowed per employment relationship and it cannot be renewed. No fresh probation can be imposed on the same post, on promotion to a different role, or when a fixed-term contract is continued as a CDI. Absence through illness, family leave or pregnancy suspends it, and on return it is extended by the length of the absence, capped at one month. Inside a CDD, probation is limited to one quarter of the stipulated duration.

Notice during probation runs on its own scale and is the same for both sides. Neither party may terminate during the first two weeks, except for faute grave (serious misconduct). After that, a probation set in weeks carries one day’s notice for each week agreed, and one set in months carries four days for each month, with a floor of fifteen days and a ceiling of one month. On the ITM’s own examples, one month of probation gives fifteen days and six months gives twenty-four.

The clause that fails most often is the non-compete, because Luxembourg restrains something narrower than a foreign template assumes. Under Article L.125-8 of the Code du travail, a clause de non-concurrence prevents a former employee from carrying on a similar activity as an independent or self-employed person. It does not stop them taking salaried employment with a competitor, and the ITM says so in terms, so a clause barring someone from working for a competitor in any capacity reaches past the article.

The statutory conditions are cumulative. The clause must be in writing or it is null; the employee must be of full age when signing; gross annual pay at departure must exceed €67,641.70 at the index of 992.24, and below that the clause is deemed unwritten; it may run no more than twelve months after the contract ends; it must be confined to localities where the employee could genuinely compete, and cannot extend beyond Luxembourg’s national territory; and it must name a determined professional sector and activities similar to the employer’s. It also falls away if the employer dismisses with immediate effect without real and serious cause, ignores the statutory notice, or dismisses for a serious fault later held abusive.

Luxembourg does not oblige an employer to pay for a non-compete, unlike Belgium and France, though paid clauses have become more common. Write compensation in and the employer is held to it: a Luxembourg labour court has refused an attempt to drop the clause unilaterally and avoid paying. Case law has also accepted strengthened clauses reaching salaried competition where compensation is appropriate and the restraint proportionate, so anything drafted that way belongs with Luxembourg counsel.

Three further imports fail quietly. A clause forbidding the employee to work for another employer outside the agreed normal working hours is null and void unless objectively justified by health and safety, confidentiality or a conflict of interest. A confidentiality clause is valid and survives the contract, but it has to be circumscribed and precise, because a blanket ban on indiscretion of any kind has been held invalid. And a part-time contract that leaves out the hours and their distribution makes the employee presumed full-time. Our note on protecting IP when hiring in Luxembourg goes further.

Someone registered to employ in Luxembourg has to sign the contract, because it binds a Luxembourg employer and carries that employer’s filing duties. Employer of Record Luxembourg is registered to employ in Luxembourg, so the contract is with us, drawn up to Luxembourg requirements and signed in two originals with the employee by the first day at the latest.

The commercial terms stay with you: the role, the salary and how it will move, the benefits, any probation, and whether a fixed term is justified. We draft the document and say where a clause used elsewhere will not hold under the Code du travail, most often the non-compete, the notice provisions and anything assuming employment can end at will.

A draft is usually ready within hours of the salary and start date being agreed, and onboarding typically takes one to two days for EU nationals once the employee’s details are in. The déclaration d’entrée goes to the CCSS within eight days, the tax card follows from the ACD, and payroll runs from there. The fee is flat, from €499 per employee per month, on the pricing page.