Maternity and paternity leave in Belgium: What employers need to know

The 6-week prenatal window (8 weeks for multiple births) breaks into two sub-periods:

• 1 mandatory week immediately before the expected due date. Neither the employee nor the employer can waive it.
• 5 optional weeks (7 for multiple births). The mother may take these before the due date or defer them to extend the postnatal period.

Unused optional prenatal weeks cascade forward. A mother who works through all five optional weeks and delivers on schedule can take up to 14 weeks postnatal (9 mandatory + 5 deferred). If the child is born after the expected date, prenatal leave automatically extends to the actual birth date.

The 9-week postnatal period is absolute. Returning to work during this window is a criminal offence under Belgian labour law, and employers face criminal penalties for permitting it.

Where the newborn requires hospitalisation beyond the first 7 days after birth, the mother may request an extension equal to the hospitalisation period beyond those 7 days, capped at an additional 24 weeks. The extension must be supported by a hospital attestation and communicated to the employer and sickness fund.

The employee provides her employer with a medical certificate confirming pregnancy and expected due date, followed by written notice specifying leave start and end dates. The employer must then notify the relevant sickness fund (mutualité or ziekenfonds) approximately 7 weeks before the planned leave start.

Late notification does not void the entitlement but can delay the first sickness fund payment by 4-6 weeks. For EOR arrangements where the local employer entity handles filings, the timing obligation falls on the EOR, not the hiring company.

The INAMI/RIZIV daily salary cap is approximately €187 per day gross in 2026 (~€5,610/month). For employees earning at or below the cap, the 82% and 75% rates apply to their actual salary. For employees earning above it, the actual replacement rate drops materially below those headline percentages.

A senior employee on €7,000+ monthly gross may see replacement fall to 50-60% of normal salary during the 75% phase. Foreign employers hiring senior staff in Belgium should account for this gap when benchmarking total compensation against local market expectations.

There is no statutory obligation to top up beyond Phase 1. However, many sectoral collective agreements (CCT/CAO) require employers to supplement the sickness fund payment to 100% of normal salary throughout leave. The applicable Joint Committee (Comité Paritaire / Paritair Comité) determines whether a top-up obligation exists for each employee. EOR providers commonly fall under Joint Committee No. 200 (white-collar, non-sector-specific), which does not universally mandate a maternity top-up.

Beyond what the law requires, 100% salary top-up during maternity leave has become a de facto market expectation in Belgium’s multinational employer community, particularly for professional and managerial roles. Foreign employers applying only the statutory cascade routinely encounter dissatisfaction and retention risk among senior female employees.

Belgian law extends birth leave eligibility beyond married fathers. The following qualify:

• Married co-parents of either sex
• Legally cohabiting co-parents (cohabitants légaux / wettelijk samenwonenden)
• Co-parents who have lived with the biological mother at the same principal residence for at least 3 consecutive years before the birth
• Unmarried fathers who have made a declaration of paternity

If a legal father or co-parent already exists, a second co-parent without legal parentage is not entitled to birth leave.

Parental leave can be taken in four formats, each extending the total duration proportionally:

Full-time, half-time, and one-fifth arrangements are entitlements the employer cannot refuse. The one-tenth reduction (introduced by the Act of 2 September 2018) requires employer consent. For employees in companies with fewer than 50 workers, an income-related formula (approximately 60% of salary loss, capped) may apply rather than the flat-rate amounts.

To qualify, the employee must have been employed by the same employer for at least 12 months within the preceding 15 months at the time of application. Companies hiring internationally should build this eligibility check into onboarding workflows. Written notice to the employer is required 2-3 months before the intended start date. Annual leave continues to accrue during parental leave, though parental leave may affect holiday entitlement for the following year and, in some arrangements, pension accrual timelines.

Time credit (crédit-temps / tijdskrediet) is a parallel career-interruption system also administered by ONEM/RVA. It allows up to 48 months of career interruption for childcare purposes over a career. The two systems are separate entitlements and can be used sequentially. From 2023, time credit eligibility requires 3 years of service with the same employer, a higher bar than parental leave’s 12-month threshold.

Under Article 40 of the Labour Act, dismissal is prohibited from the moment a pregnant employee notifies her employer of the pregnancy until one month after postnatal leave ends. The protection activates on notification, not on the pregnancy itself.

If the employer cannot demonstrate that the termination reason is entirely unrelated to pregnancy or maternity, the employee is entitled to a lump-sum protection indemnity of 6 months’ gross remuneration. The burden of proof lies entirely with the employer.

Since a 2023 legislative amendment, Belgian law explicitly allows the cumulation of multiple indemnities:

• 6-month maternity protection indemnity (Labour Act, Article 40)
• 6-month gender discrimination indemnity (Gender Anti-Discrimination Act of 2007)
• 6-month health-status discrimination indemnity (if applicable)

An Antwerp court ruling in January 2024 confirmed this, awarding three separate indemnities totalling 18 months’ salary against an employer who dismissed an employee suffering from postnatal depression. The burden of proof for all discrimination claims lies with the employer, not the employee.

Job protection during parental leave runs from the date of the application until 3 months after parental leave ends. The same 6-month indemnity applies for unjustified dismissal.

The protection window is longer than maternity protection by two months, which means employers restructuring teams with employees on parental leave face a longer period of constraint before lawful termination becomes straightforward.

The Act of 24 March 2024 introduced protection for employees undergoing fertility treatment or medically assisted reproduction. Protection runs from the date the employer receives a medical certificate until 2 months later, renewable for each new treatment cycle.

Unjustified dismissal during the window triggers a further 6-month indemnity. Because the protection renews with each treatment cycle, an employee undergoing multiple cycles can be in a near-continuous protected state for extended periods.

Every employer of Belgian-resident employees must register with the ONSS/RSZ. Social security contributions in the private sector run approximately 25% employer and 13.07% employee on gross salary.

From 1 July 2025, a cap applies: basic employer contributions are no longer due on quarterly gross salary exceeding €85,000 per employee. The cap reduces cost for high earners but does not affect the employee contribution rate.

Every new hire must be declared through Dimona (an electronic real-time notification to the NSSO) before the employee’s first working day. Quarterly DmfA declarations covering salary and working-time data are also required.

From January 2025, the monthly ASR ZIMA001 declaration is additionally required for each month in which an employee takes birth leave days charged to the sickness fund. Missing a ZIMA001 filing delays sickness fund reimbursement and can trigger administrative penalties.

The salaire garanti during maternity leave (first 7 days) and birth leave (first 3 days) is a direct employer cash cost that cannot be shifted to the sickness fund. During the sickness fund-paid phases, the employer continues paying ONSS/RSZ contributions on the notional salary basis.

The combined guaranteed-salary obligation for a mid-level employee taking maternity leave followed by a partner taking birth leave is approximately €1,700-€1,900 in direct cash outlay across the two events.

Belgium’s three linguistic regions share identical federal law but route administrative interactions through different-language bodies. French-speaking employees interact with the mutualité; Dutch-speaking employees with the ziekenfonds. Forms, declarations, and correspondence follow regional language rules.

EOR providers handling bilingual workforces must route correctly to avoid processing delays. Filing with the wrong linguistic body does not invalidate the claim but can add 2-4 weeks to processing timelines.

Every Belgian employer is assigned to one or more Joint Committees based on sector and activity. Joint Committee agreements often mandate provisions that exceed statutory minimums, including salary top-ups during maternity leave and extended leave durations for specific staff categories.

Employers using an EOR in Belgium should verify top-up obligations for each employee’s sector rather than assuming company-level defaults apply. Joint Committee 200, the most common for white-collar EOR hires, does not universally mandate maternity top-ups, but other JCs do.