Summary dismissal in Luxembourg: gross misconduct, procedure and payroll

In short. Dismissal with immediate effect for gross misconduct ends the contract with no notice and no severance pay. It requires misconduct that makes keeping the working relationship immediately and definitively impossible. The employer must invoke it within the month following knowledge of the facts, describe the misconduct precisely in a registered letter, and, from 150 employees, hold a preliminary meeting. Below that threshold, the meeting is not compulsory. Even without severance, the employer settles untaken leave and the time-savings account. Poorly justified, this dismissal is reclassified as unfair, with a heavy financial risk.

Dismissal for gross misconduct is the most abrupt termination in Luxembourg labour law, and the riskiest for the employer. Abrupt, because it ends the contract overnight, with no notice. Risky, because misconduct the Labour Tribunal finds not serious enough turns an immediate departure into an unfair dismissal, with damages to follow. Here, for an SME owner, is how to run a dismissal with immediate effect in Luxembourg: what counts as gross misconduct, the deadlines to keep, the procedure, and what is settled in payroll once the employee has left.

What is a dismissal for gross misconduct in Luxembourg?

Dismissal with immediate effect, provided for by article L.124-10 of the Labour Code, is the termination of the contract on the employer's initiative with no notice and no severance pay, for serious misconduct attributable to the employee. It is distinct from dismissal with notice, which lets the relationship carry on for several months, and from termination during the trial period, which follows its own rules. It is an exceptional route, reserved for situations where keeping the employee, even for the length of a notice period, is no longer tenable.

What counts as gross misconduct

The law draws up no list. It sets a test: gross misconduct is misconduct that makes keeping the working relationship immediately and definitively impossible. Two words matter. "Immediately", because if the employer can still put up with the employee for the length of a notice period, then the misconduct was not that serious. "Definitively", because a passing tension is not enough.

To assess seriousness, the judge, and so the employer before them, takes into account several factors specific to the employee: their level of education, their professional record, their social situation and their level of responsibility. The same error does not carry the same weight for a senior manager and for an employee recently hired into a junior role. This case-by-case assessment is exactly what makes the ground slippery: it is not the nature of the act alone that decides, but its seriousness in context. Dismissal with immediate effect applies to an open-ended contract as much as to a fixed-term one.

The one-month deadline: the rule that traps employers

This is the most common mistake. An employer who wants to invoke gross misconduct must act fast: it has one month from the day it learned of the facts to notify the dismissal. After that, the misconduct is deemed tolerated, and the immediate dismissal becomes irregular. An example: a fact learned on 5 May can ground a dismissal until 5 June, no later.

Three qualifications temper this rule. The deadline does not run if the facts give rise to criminal proceedings brought within the month. Old misconduct can be cited in support of fresh misconduct of the same kind. And the deadline is suspended if the employee falls ill or has an accident after the employer learned of the facts. Outside these cases, the clock ticks, and a case that is sound on the merits is often lost on this deadline alone.

Precautionary suspension

Between the moment the employer discovers the misconduct and the moment it notifies the dismissal, it can remove the employee from the company through a precautionary suspension. It can be oral or written, and crucially it is not a sanction: during the suspension, salary and benefits continue to be paid as normal. It is a holding measure, the time to complete the procedure. For a protected employee, such as a staff delegate, this suspension is even a required step before any procedure.

The procedure: a preliminary meeting from 150 employees

As with dismissal with notice, the preliminary meeting is compulsory only in companies with at least 150 employees. Below that threshold, the employer may hold one voluntarily, but its absence does not affect the validity of the dismissal.

Where it is required, the summons goes out by registered letter or by hand against a receipt, with a copy to the staff delegation. It states the reason, the date, the time, the place of the meeting and each party's options for assistance. The meeting can be held at the earliest on the second working day after the summons is sent. The dismissal letter then goes out at the earliest the day after the meeting, and at the latest eight days after. If a suspension has been pronounced, the meeting must take place between the first and the eighth day following it.

In a company with fewer than 150 employees, with no meeting, a dismissal notified after a suspension comes at the earliest the next day and at the latest eight days after, that deadline being suspended if the employee is ill.

Notification: a letter that states the facts precisely

The dismissal is notified in writing, by registered post or by hand with acknowledgement of receipt on the copy. The content of the letter is decisive: it must describe the gross misconduct precisely, with facts, dates and circumstances, and be drafted in a language the employee understands. A vague letter, content to mention "unacceptable behaviour" without detail, exposes the employer to seeing the dismissal ruled unfair for lack of reasoning. Reasons left out cannot be added later: it is the facts set out in the letter that will be examined, and those alone.

No notice or severance, but a settlement to draw up

Dismissal for gross misconduct takes effect immediately: the contract stops on the date of notification, with no notice. The employer pays no severance, unlike a dismissal with notice where it is due from five years of service. That said, the employee does not leave empty-handed. The employer must pay the accrued and untaken leave, as a compensatory indemnity, and the balance of the time-savings account. These amounts are calculated and paid on the final payslip, and we cover the calculation of leave entitlements in our guide to paid leave in Luxembourg.

One particular case is worth knowing: if the employee benefited from co-financed continuing training, the employer can, under conditions, claim partial reimbursement. The reimbursement covers the costs of the current financial year and the three preceding years, at 100 % for the current year and the previous one, 60 % for the second preceding year and 30 % for the third, less the co-financing received and an allowance of 1 240 € per financial year.

Employees you cannot dismiss this way

Some employees have reinforced protection. Staff delegates, full members and substitutes, as well as equality and health-and-safety delegates, are protected throughout their five-year term of office, the six months that follow its end and the three months that precede the elections. Against them, a dismissal procedure is void: only a suspension, followed by a referral to the judge, is possible. Likewise, an employee on duly declared sick leave has a protection we cover in our piece on sick leave in Luxembourg. Trying to move fast against a protected employee is the surest way to turn the termination into litigation.

The risk: reclassification as unfair dismissal

This is the whole stake. An employee who challenges the dismissal has three months from notification to bring the matter before the Labour Tribunal. That deadline is interrupted if the employee sends a written claim to the employer in the meantime: a fresh one-year deadline then runs from that claim. The competent court is the Labour Tribunal of Esch-sur-Alzette, Luxembourg or Diekirch, in principle the one for the employee's place of work. At first instance, the parties may represent themselves or be represented; on appeal, assistance by a lawyer becomes compulsory.

If the judge finds the misconduct was not serious enough to justify an immediate departure, the dismissal is ruled unfair. The employer then faces an indemnity repairing the loss, which can cover the notice the employee was denied and more. On top of that, in companies with at least 150 employees, a specific indemnity of up to one month's salary applies for failure to summon the employee to the meeting, for the formal irregularity alone. Which is to say, a badly prepared gross-misconduct dismissal often costs more than a dismissal with notice run by the book.

And unemployment benefit for the employee?

Let's be clear, because the question always comes up: a dismissal for gross misconduct does not automatically bar the employee from unemployment benefit, but it does not open it as of right either. It is the National Employment Agency (ADEM) that assesses the situation and can refuse or defer unemployment benefit where the job loss results from the employee's fault. The decision belongs to ADEM, not the employer, and each file is examined separately. This point falls outside payroll, but it often explains why an employee challenges the dismissal: the stake goes beyond the final settlement.

Payroll and accounting treatment

Once the decision is made, the departure is settled on a final payslip and in your books. The employer draws up the final settlement, last salary, compensatory indemnity for untaken leave and the balance of the time-savings account, then files the employee's exit declaration with the Joint Social Security Centre. Unlike a dismissal with notice, there is no worked period to pay afterwards and no severance to provision: the cost is concentrated on a single payroll.

For the company, the point is that this settlement shows up immediately in its accounting position, not weeks later. Payroll linked to the accounts, like the one we keep in the Odoo where your books live, brings the cost of the departure through in real time. The principle of outsourcing payroll in Luxembourg is set out in our dedicated guide, and the full framework of our fixed fee in our guide to the accounting firm in Luxembourg.

Frequently asked questions

What is gross misconduct in Luxembourg?

It is misconduct that makes keeping the working relationship immediately and definitively impossible. The law draws up no list: seriousness is assessed case by case, taking into account the employee's level of education, their record, their social situation and their level of responsibility.

What is the deadline to dismiss an employee for gross misconduct?

The employer must invoke the misconduct within the month following the day it learned of it. The deadline does not run where criminal proceedings are brought within the month, and it is suspended if the employee falls ill after the employer learned of the facts.

Is there notice or severance pay for gross misconduct?

No. The dismissal takes effect immediately, with no notice, and no severance is due. The employer must still pay accrued untaken leave and the balance of the time-savings account on the final payslip.

Is the preliminary meeting compulsory for gross misconduct?

Only in companies with at least 150 employees. Below that threshold it is not compulsory and its absence does not affect the validity of the dismissal, although the employer may choose to hold one.

What does the employer risk if the gross misconduct is not upheld?

The dismissal is reclassified as unfair. The employer may be ordered to pay an indemnity repairing the loss, including the notice the employee was denied, and a formal indemnity of up to one month's salary in companies with at least 150 employees where no meeting was held.

Read on

• Dismissal with notice in Luxembourg: notice periods and severance pay
• The trial period in Luxembourg: duration, notice and termination
• Sick leave in Luxembourg: pay, medical certificate and protection
• Outsourcing payroll in Luxembourg: who, how, how much
• Accounting firm in Luxembourg: the complete guide for an SME

Why Advena?

We keep the accounts and payroll of Luxembourg SMEs of 1 to 50 employees inside the management tool we deploy ourselves, on a fixed fee from 325 € per month, all in. On a gross-misconduct departure, that means a sound final settlement, untaken leave and time-savings account included, the exit declaration to the Joint Social Security Centre, and entries that feed straight into the Odoo where we keep your books, so the cost of the departure shows in your position in real time. To be clear: we handle turning a dismissal into payroll and accounting, but we do not classify misconduct or defend a file in your place. On the seriousness of misconduct or a contested procedure, an employment-law adviser is better placed, and we will tell you so.

Information current as of October 2026, based on the rules for dismissal with immediate effect for gross misconduct set out by Guichet.lu, the rules on challenging a dismissal before the Labour Tribunal and information from the Labour and Mines Inspectorate. As these rules can change and every situation is specific, this article is informational and not individualised legal, tax or social advice.