How to Dismiss an Employee in Belgium (2026): Step‑by‑step Employer Guide

Understanding how to dismiss an employee in Belgium 2026 is now more complex, and more consequential, than at any point since the harmonisation of blue‑ and white‑collar notice rules in 2014. The labour‑law reforms published in the Moniteur belge in mid‑2026 introduced a statutory cap on employer‑initiated notice periods, tightened the timeline for summary dismissals, and rewrote the transitional calculation rules that employers and payroll teams have relied on for a decade. This guide walks private‑sector employers, HR managers and in‑house counsel through the complete dismissal procedure in Belgium, from eligibility checks and notice‑period calculations to required documents, costs and common pitfalls, under the rules now in force.

Whether you are terminating a short‑service employee, a long‑tenured manager whose notice is affected by the new 52‑week cap, or contemplating summary dismissal for serious cause, the procedural steps and timelines below set out exactly who needs to do what, and when.

Overview of the dismissal procedure in Belgium and who it applies to

Belgian employment law gives employers four principal routes to end an employment relationship: dismissal with notice (the standard route for indefinite‑duration contracts), dismissal for serious cause (summary dismissal without notice), termination by mutual agreement, and, where minimum headcount thresholds are met, collective redundancy under the Renault Act (Wet‑Renault / Loi Renault). Each route carries its own procedural obligations, notice or indemnity calculations, and risk profile.

The statutory framework is anchored in the Employment Contracts Act of 3 July 1978 (Wet betreffende de arbeidsovereenkomsten / Loi relative aux contrats de travail), as amended, most recently by the 2026 Act published in the Moniteur belge. Official guidance is maintained by the Federal Public Service Employment, Labour and Social Dialogue (FPS Employment). Social security filing obligations on termination are governed by the rules of the National Social Security Office (ONSS/RSZ), and disputes are heard by the labour courts under the jurisdiction of the Federal Public Service Justice.

This guide applies to private‑sector employers in Belgium, including Belgian subsidiaries of foreign groups, across all contract types: indefinite‑duration, fixed‑term and temporary. Public‑sector employers and certain categories of senior executives are subject to additional or different rules and should seek specialist advice. The same applies to sea‑going workers and domestic staff, who fall outside the standard Employment Contracts Act framework.

Eligibility and prerequisites for dismissal in Belgium

Belgian law does not require the employer to establish a specific “ground” before issuing notice in the way that some continental systems do. An employer may, in principle, dismiss for any reason, economic restructuring, poor performance, organisational change, provided the dismissal is not manifestly unreasonable within the meaning of Collective Bargaining Agreement No. 109 (CAO 109 / CCT 109). A dismissal is manifestly unreasonable if it is unconnected to the employee’s aptitude or conduct, or to the operational needs of the business, and if it is a decision that no reasonable employer would have taken. The sanction for manifestly unreasonable dismissal is a compensation of between 3 and 17 weeks’ pay.

Certain categories of employee enjoy enhanced protection, meaning the employer must follow additional procedures or face higher compensation:

• Pregnant employees and employees on maternity/paternity leave. Dismissal during pregnancy or within a protected period after birth triggers a presumption of unlawfulness and exposes the employer to a fixed lump‑sum indemnity equal to six months’ gross remuneration, unless the employer proves the dismissal is wholly unrelated to the pregnancy or leave.
• Works council and health‑and‑safety committee members. Protected employee representatives may only be dismissed for serious cause recognised by the labour court or for economic or technical reasons approved by the joint committee, the so‑called “Renault protection.”
• Employees on sick leave or incapacity. Dismissal during incapacity is not prohibited outright, but the employer must demonstrate that the decision is unrelated to the health condition and comply fully with notice or indemnity obligations. The anti‑discrimination rules add further exposure.
• Trade union delegates. Delegates benefit from a protection comparable to that of works council members under most sectoral CBAs.

Special cases: fixed‑term contracts, temporary agency workers and senior executives

Fixed‑term contracts ordinarily end at the agreed term without notice. Early termination by the employer requires payment of an indemnity equal to the remuneration due for the remaining term, subject to a double cap: the indemnity may not exceed the notice period that would have applied had the contract been indefinite. Temporary agency workers are employed by the agency, not the user company, the user company ends the assignment, not the contract. Senior executives above certain remuneration thresholds may be subject to special notice clauses negotiated in the contract, provided these comply with statutory minima.

How to dismiss an employee in Belgium 2026: step‑by‑step procedure

Step	Who does it	Typical duration
1. Decide lawful basis & check eligibility	HR + In‑house counsel / external lawyer	1–5 working days
2. Calculate notice or notice pay (apply 2026 rules)	HR Payroll + Legal	1–3 working days
3. Investigate & hold disciplinary meeting (if misconduct)	Management + HR + Legal	1–14 days
4. Summary dismissal decision & written notification (if serious cause)	Employer (must act immediately)	Within 3 working days of definitive knowledge
5. Draft and serve the notice / dismissal letter	HR + Legal (employer)	On decision day, delivery timing varies
6. Close out social security & payroll obligations	Payroll / Employer	Within next payroll cycle
7. Offer settlement / negotiate mutual termination (if appropriate)	Employer + Employee + Lawyer	1–14 days (negotiable)

Step 1, Decide the lawful basis and check eligibility

Before any dismissal letter is drafted, the employer’s HR team, supported by in‑house or external counsel, must identify the correct legal route. The key decision points are: (a) is the contract indefinite, fixed‑term or temporary? (b) does the employee fall within a protected category (pregnancy, works council membership, sick leave)? (c) does the planned action trigger collective‑redundancy thresholds under the Renault Act? and (d) is there a case for serious cause (permitting summary dismissal) or will the employer proceed with notice or payment in lieu?

If the employee is protected, the employer must first satisfy the additional procedural requirements, for example, obtaining labour‑court authorisation for a works council member or documenting that the reason for dismissal is unrelated to a pregnancy. Proceeding without this step exposes the employer to lump‑sum indemnities and, in the case of employee representatives, potential reinstatement obligations.

Step 2, Calculate the notice period or notice pay under the 2026 rules

The notice period for an employer‑initiated dismissal depends on the employee’s uninterrupted seniority with the employer. Under the Employment Contracts Act (as amended by the 2026 reforms), the notice period is expressed in weeks and increases with seniority. For contracts entered into on or after the reference date set by the 2026 Act, the employer’s notice obligation is now subject to a statutory cap of 52 weeks. For contracts that pre‑date the reforms, transitional rules apply: the employer must calculate notice in two parts, seniority accrued before the transitional date and seniority accrued after, and sum the two components, applying the relevant scale to each.

The notice period begins on the Monday following the week in which notice is served (for notices served by registered post, the notice is deemed received on the third working day after posting). The employer may, instead of requiring the employee to work through the notice period, pay a notice indemnity, a lump sum equal to the remuneration (including benefits in kind, employer pension contributions and other contractual elements) that the employee would have earned during the notice period.

Worked example A, junior employee, 2 years’ seniority, contract post‑reform: Under the statutory scale, 2 years’ seniority translates to approximately 7 weeks’ notice. Assuming a monthly gross salary of €3,500, the weekly gross is approximately €808. A notice indemnity in lieu would therefore be approximately €5,656 gross (7 × €808), before employer social security contributions.

Worked example B, long‑service employee, 25 years’ seniority, affected by the 52‑week cap: Before the 2026 reforms, 25 years of seniority would have generated a notice period well in excess of 52 weeks under the progressive scale. The 2026 cap now limits the employer’s notice obligation to 52 weeks for qualifying contracts. Where the transitional two‑part calculation produces a higher figure, the cap applies and the notice indemnity is calculated on 52 weeks of total remuneration.

Step 3, Consider summary dismissal for serious cause

Summary dismissal Belgium employers may invoke, dismissal without notice or indemnity, is reserved for serious cause (dringende reden / motif grave): conduct that makes any further professional collaboration between employer and employee immediately and definitively impossible. Classic examples include theft, fraud, violence, gross insubordination and serious breaches of confidentiality.

Timing is critical. Under the 2026 reforms, the employer must notify the employee of the summary dismissal within 3 working days from the moment the employer (or the person authorised to decide on dismissal) gains definitive knowledge of the facts constituting serious cause. A second letter setting out the precise facts must also be sent within 3 working days of the dismissal notification. Failure to observe either deadline renders the summary dismissal irregular, exposing the employer to a full notice indemnity claim. The employer bears the burden of proof both as to the seriousness of the facts and as to the timeliness of its reaction.

Step 4, Draft and serve the notice or dismissal letter

The written notice must contain the start date and duration of the notice period (for dismissal with notice) or the precise facts constituting serious cause (for summary dismissal). It must be drafted in the correct language: Dutch in the Flemish Region, French in Wallonia, and either Dutch or French in Brussels (bilingual region), or German in the German‑speaking Community. Using the wrong language may render the letter null.

Service may be effected by registered post (recommended for proof of delivery) or by hand delivery with signed acknowledgement. Service via bailiff (gerechtsdeurwaarder / huissier de justice) is also possible and provides the strongest evidence. The employer should retain a copy of the letter, the proof of postage and the return receipt in the personnel file.

Step 5, Close out administrative and social security obligations

On the termination date, the employer must pay the employee’s final settlement: any outstanding salary, the pro‑rata holiday pay (single and double holiday pay), pro‑rata 13th‑month or end‑of‑year bonus if applicable under the sectoral CBA, and the notice indemnity (if paying in lieu). The employer must also issue the mandatory employer certificate (Werkgeversattest / Attestation de l’employeur) required by the unemployment office (RVA/ONEM) and file the termination electronically with the ONSS/RSZ using the correct termination code in the quarterly DmfA declaration.

Step 6, Offer a settlement or negotiate mutual termination

Where both parties prefer certainty, for example, to avoid litigation risk or reputational harm, a mutual termination agreement (beëindiging in onderling akkoord / rupture de commun accord) may be negotiated. The agreement typically includes the financial terms (indemnity, notice period buy‑out), confidentiality and non‑disparagement clauses, a mutual release of claims, and treatment for tax and social security purposes. Mutual termination must be genuinely voluntary; a settlement signed under duress or without the employee receiving independent advice may be challenged.

Documents needed for dismissal in Belgium

Document	Notes
Written dismissal / notice letter	Issued by employer; signed and dated; sent by registered post and/or hand delivery with acknowledgement; must state notice period dates (or specify serious cause facts); retain copy in personnel file.
Final payslip and settlement calculation	Issued by employer/payroll; itemised to show notice pay, accrued holiday pay (single and double), pro‑rata bonuses; retain for a minimum of 5 years per data‑retention obligations.
Proof of delivery	Employer retains registered‑post receipt or signed handover note; essential for litigation defence if the employee disputes receipt or timing.
Minutes of disciplinary or investigatory meeting	Employer; dated, signed by all attendees; attach evidence summaries (emails, CCTV stills, witness statements); required to prove serious cause.
Employer certificate (Werkgeversattest / Attestation)	Employer; standard form required by the unemployment office (RVA/ONEM); must specify start and end dates of employment, reason for termination, and remuneration details.
Social security notifications (RSZ/ONSS filings)	Employer; filed electronically via the DmfA declaration; use the correct termination code; coordinate with payroll vendor to ensure filing within the statutory reporting cycle.
Collective information and consultation records	Employer; required only for collective redundancies; includes works council minutes, information booklets, and records of the Renault Act consultation procedure.
Settlement agreement (if used)	Signed by both employer and employee; include financial terms, tax/social‑security treatment clauses, mutual release, and any cooling‑off or revocation period if negotiated.

Language matters. Every document addressed to the employee must comply with the language legislation applicable to the employer’s registered‑office region. Documents in the wrong language are voidable and may be unenforceable. For cross‑border groups, the dismissal letter should be prepared in the legally required language; any courtesy translation should be clearly marked as such.

Evidence preservation is equally important. In summary dismissal cases, the employer must be able to demonstrate both the facts and the timeline of its knowledge. A centralised investigation folder, containing dated notes, correspondence, witness statements and digital evidence, should be compiled before the dismissal notification is issued and retained for the duration of any limitation period.

Timeline and key deadlines for the dismissal procedure in Belgium

Action triggered	Deadline / legal timing	Practical employer note
Service of written notice (dismissal with notice)	Notice period begins the Monday following the week in which notice is received; for registered post, deemed received on the 3rd working day after posting	Post early in the week to avoid the notice period starting later than intended
Summary dismissal notification	Within 3 working days from gaining definitive knowledge of serious‑cause facts	Log the date of knowledge internally and seek legal advice immediately
Letter detailing serious‑cause facts	Within 3 working days of the summary dismissal notification	Prepare the factual letter in parallel with the dismissal notification to avoid missing this second deadline
Notice period Belgium 2026, duration	Calculated per statutory scale (weeks increase with seniority); subject to the 52‑week cap for qualifying contracts	Use the two‑part transitional calculation for contracts that pre‑date the 2026 reforms
Employee claim to labour court (unfair dismissal / manifestly unreasonable dismissal)	Limitation period of 1 year from the end of the employment contract for claims under CAO 109; general contractual limitation of up to 1 year for other employment claims (verify applicable limitation per claim type)	Notify D&O insurer and preserve all personnel records for the full limitation window
Social security termination filing (ONSS/RSZ)	Reported in the quarterly DmfA declaration covering the quarter of termination	Coordinate with payroll vendor; late filing may trigger administrative penalties
Final payslip and settlement payment	At the next payroll date or on the termination date if paying notice indemnity in lieu	Check sectoral CBAs for accelerated payment obligations
Employer certificate to RVA/ONEM	Issued on or promptly after the termination date	Delay in issuing the certificate may expose the employer to liability for the employee’s lost unemployment benefits

The notice period Belgium 2026 rules also interact with suspension events. If the employee is absent due to illness, maternity leave or certain other suspending events during the notice period, the notice period is paused for the duration of the suspension (for dismissals by the employer). This can significantly extend the effective end date and must be factored into workforce planning.

Costs, fees and tax considerations for dismissals in Belgium

Cost item	Amount / how calculated	Notes
Notice indemnity (pay in lieu of notice)	Weeks of notice × weekly total remuneration (gross salary + benefits in kind + employer pension contributions + variable pay average); subject to the 52‑week cap for qualifying contracts	Employer social security contributions (approximately 25 % employer ONSS rate) are due on the notice indemnity
Compensation for manifestly unreasonable dismissal (CAO 109)	Between 3 and 17 weeks’ remuneration, court‑determined	Risk arises where the employer cannot show the dismissal was connected to aptitude, conduct or operational needs
Protected‑employee indemnity	Varies by category, e.g., 6 months’ gross for unlawful dismissal during pregnancy; variable lump sums for works council members	Can be cumulative with notice indemnity, significantly increases total dismissal cost
Outstanding holiday pay (single + double)	Pro‑rata accrued entitlement calculated to the termination date; includes double holiday pay (92 % of monthly gross for the accrued period)	Check sectoral CBAs for 13th month or end‑of‑year bonus pro‑rata obligations
Employer social security contributions on final pay	Calculated on all remuneration components per ONSS rules; employer rate approximately 25 % (varies by sector and applicable reductions)	Some settlement payments structured as damages (not remuneration) may be social‑security exempt, obtain written confirmation from tax counsel
Legal fees (external counsel)	Market rates vary; budget €2,000–€10,000+ per individual dismissal depending on complexity and litigation risk	Early engagement of counsel for summary dismissals or protected‑employee cases reduces overall exposure
Administrative costs	Registered post (approximately €8–€15 per letter), bailiff service (approximately €150–€300), HR administration hours	Low per‑unit cost but should be documented for internal cost allocation

Worked cost examples

Example A, termination with notice, short‑service employee (2 years’ seniority, post‑reform contract). Notice period: approximately 7 weeks. Monthly gross salary: €3,500 (weekly gross ≈ €808). Notice indemnity if paying in lieu: approximately €5,656 gross. Add employer ONSS (≈ 25 %): ≈ €1,414. Holiday pay balance: variable. Total employer outlay (excluding legal fees): approximately €7,000–€8,000.

Example B, long‑service employee (25 years, affected by 52‑week cap). Under the 2026 cap, notice is limited to 52 weeks. Monthly gross salary: €5,500 (weekly gross ≈ €1,269). Notice indemnity: approximately €65,988 gross. Add employer ONSS (≈ 25 %): ≈ €16,497. Holiday pay balance: variable. Total employer outlay: in the region of €85,000–€95,000 before legal fees and pro‑rata bonus.

Example C, summary dismissal for serious cause. No notice indemnity is owed if the serious cause is upheld. However, if the employee challenges the dismissal and the labour court finds the serious cause was not established, the employer will owe the full notice indemnity (as if notice had been given) plus potential court costs and legal fees. The financial risk of a failed summary dismissal can therefore exceed the cost of a standard notice‑period termination.

What changes in 2026: key reforms affecting the dismissal procedure

The 2026 labour‑law reforms, published in the Moniteur belge (Belgisch Staatsblad), introduced several changes that directly affect how employers dismiss employees in Belgium in 2026 and beyond:

• 52‑week cap on employer notice. For contracts entered into on or after the effective date specified in the 2026 Act, the employer’s notice period is capped at 52 weeks regardless of seniority. Industry observers expect this cap to become the single most important variable in long‑service termination budgets.
• Revised transitional calculation. For contracts that pre‑date the reform, employers must continue to apply the two‑part transitional calculation (pre‑ and post‑harmonisation seniority), but the total is now subject to the 52‑week ceiling for qualifying contracts. Payroll teams should update their calculation templates accordingly.
• Stricter summary‑dismissal timeline. The 2026 reforms codified and tightened the rule that the employer must notify the employee of summary dismissal within 3 working days from gaining definitive knowledge of the serious‑cause facts. A separate letter detailing those facts must follow within a further 3 working days. The likely practical effect is that employers will need to involve legal counsel earlier in misconduct investigations to avoid missing the window.
• Transitional provisions. Contracts that began before the reform’s effective date remain subject to the existing notice‑period scales for seniority accrued before that date. Only seniority accrued after the reform start date is subject to the new scale and cap. Employers with a mixed‑tenure workforce must run parallel calculations.

Early indications suggest that the Belgian labour courts will scrutinise compliance with the new timing rules closely, particularly in summary dismissal disputes. Employers are advised to document the precise date on which they gained definitive knowledge of the facts and to obtain legal sign‑off before issuing the notification letter.

Common pitfalls and how to avoid them

• Failing to preserve investigation evidence. Without a dated, centralised evidence folder, the employer cannot prove serious cause or the timeliness of its reaction. Fix: create a standard investigation file template and log all evidence with dates.
• Missing the 3‑working‑day window for summary dismissal. Even a single day’s delay can render the summary dismissal irregular and expose the employer to a full notice indemnity. Fix: escalate misconduct matters to legal counsel on day one.
• Miscalculating notice under the 2026 cap. Applying the old uncapped scale to a post‑reform contract overstates the obligation; applying the cap to a pre‑reform contract without the transitional calculation understates it. Fix: update payroll calculation templates and obtain legal sign‑off on each calculation.
• Ignoring protected‑employee status. Dismissing a pregnant employee or works council member without following the special procedure triggers lump‑sum indemnities that can double or triple the total dismissal cost. Fix: run a protected‑status check before initiating any dismissal.
• Using the wrong language in the dismissal letter. A letter in French served on an employee of a Flemish‑region employer is voidable. Fix: always confirm the employer’s registered‑office region and draft the letter in the corresponding language.
• Omitting the reason from a summary dismissal letter. The factual letter must set out the precise facts; vague references to “misconduct” are insufficient. Fix: have counsel review the factual letter before dispatch.
• Delaying social security filings. Late DmfA reporting can trigger administrative penalties and delay the employee’s access to unemployment benefits, potentially exposing the employer to a damage claim. Fix: coordinate with the payroll vendor to file in the same quarter.
• Neglecting the employer certificate. The Werkgeversattest must be issued promptly; delays can make the employer liable for the employee’s lost benefits. Fix: automate certificate generation in the payroll system.

Sources

1. FPS Employment, Labour and Social Dialogue (Belgium)
2. Belgian Official Gazette (Moniteur belge / Belgisch Staatsblad), eJustice portal
3. National Social Security Office (ONSS/RSZ), SocialSecurity.be
4. Court of Cassation (Belgium), official judgments database
5. Federal Public Service Justice (Belgium)
6. KU Leuven, Belgian university labour law research