Valid Grounds for Dismissal in Luxembourg

1. The general validity criterion

A dismissal is legally valid when it is based on real and serious grounds linked either to the employee's aptitude or conduct, or to the operational needs of the company, establishment or department (Art. L.124-11).

A "real" ground means that the facts relied upon are objectively verifiable and are not a pretext concealing the true reason for the termination. A "serious" ground means that those facts are sufficiently grave to justify the decision to dismiss. A trivial, disproportionate or prejudice-based ground does not meet this requirement.

2. Grounds related to the employee

This category covers all facts or situations directly attached to the employee personally, whether concerning their professional capabilities or their behaviour.

Aptitude

Aptitude refers to the employee's capacity to perform the duties of their post. An employer may rely on demonstrated professional inadequacy, persistent failure to meet agreed objectives or lasting inability to meet the job's requirements to justify dismissal.

Conduct

Conduct covers all professional behaviour by the employee: failure to follow instructions, non-compliance with internal rules or a code of conduct, repeated unjustified absences, inappropriate attitude towards colleagues or customers. The seriousness of the conduct must be assessed on a case-by-case basis, taking into account the context, prior warnings and company practice.

An isolated, low-intensity incident will generally not be sufficient to justify dismissal. Conversely, a documented accumulation of failings — even individually minor ones — may constitute real and serious grounds if the employer has previously alerted the employee and the employee has not modified their behaviour.

3. Grounds related to business operations

These grounds are external to the employee: they arise from economic, organisational or technological constraints that require the employer to restructure its workforce.

This category includes operational needs of the company, establishment or department, internal restructuring, post eliminations following a reorganisation, technological changes rendering a position obsolete, and lasting economic difficulties affecting the business (Art. L.124-11).

The employer must be able to demonstrate that the economic or organisational ground is real — i.e. objectively verifiable — and that the elimination of the employee's post follows directly from it. An economic ground fabricated to cover a personal disagreement would be reclassified as a wrongful dismissal.

4. Serious misconduct

Serious misconduct is a derogatory regime that entitles the employer to terminate the contract immediately and without payment of notice or severance pay. It must not be confused with ordinary real and serious grounds: the threshold is significantly higher.

Statutory definition

Serious misconduct is any act or fault that makes the immediate and permanent continuation of the employment relationship impossible, such that a notice period could not be granted without serious risk to the company or third parties (Art. L.124-10, paragraph 2). Classic examples include theft, physical violence in the workplace, disclosure of trade secrets or the commission of a criminal offence directly connected to the performance of the contract.

Judicial assessment

Labour courts assess the gravity of the facts concretely, taking into account in particular the employee's level of education, their disciplinary record, their social situation and the consequences the dismissal has for them. The same act may thus be classified as serious misconduct in the case of an experienced manager and not in the case of a junior employee or one in a particularly vulnerable situation.

Time limit for action

The employer must notify dismissal for serious misconduct within one month from the day they became aware of the facts justifying it (Art. L.124-10, paragraph 6). This time limit is suspended where parallel criminal proceedings concern the same facts.

5. What does not constitute valid grounds

The Labour Code expressly excludes certain facts from constituting valid grounds for dismissal. These exclusions apply to both ordinary dismissal and dismissal for serious misconduct.

Exercise of the right to strike. An employee who participates in a lawful professional strike cannot be dismissed on that basis (Art. L.124-11, paragraph 4). A dismissal pronounced in retaliation for participation in a regular strike would be null and void.

Refusal to switch to part-time work. A full-time employee who refuses to have their contract converted to a part-time contract cannot be dismissed for that reason alone (Art. L.124-11, paragraph 5).

Refusal to work hours beyond contractual limits. A part-time employee who refuses to work hours beyond the limits set by their contract cannot be dismissed for that reason (Art. L.124-11, paragraph 6).

Waiver of an early retirement indemnity. The fact that an employee waives entitlement to an early retirement indemnity cannot constitute a ground for dismissal (Art. L.124-11, paragraph 7).

6. Wrongful dismissal

A dismissal is classified as wrongful when it is contrary to statutory provisions or when it is not based on real and serious grounds (Art. L.124-11). The absence of written reasons also renders a dismissal wrongful, regardless of any consideration as to the merits of the grievances (Art. L.124-5).

An employee who is the victim of a wrongful dismissal may bring proceedings before the competent Labour Tribunal to obtain damages. The judge has sovereign discretion in assessing the amount of compensation, taking into account in particular the employee's seniority, age, family situation and the difficulty of finding new employment. Reinstatement to the post is not generally ordered, except in specific cases (protected employees in particular).