Belgium grants fathers 20 days of fully paid paternity leave at 100% of salary, funded through the social security system. The leave is mandatory, cannot be refused by the employer, and must be taken within a specific window following the birth. Belgium’s paternity leave is among the most generous in Europe, combining a long duration with full pay.
This guide covers Belgian paternity leave in 2026: the 20-day entitlement, the pay calculation, employer obligations, the notice requirements, and how paternity leave fits alongside maternity and parental leave.
Key takeaways
- Fathers receive 20 days of paid paternity leave at 100% of salary, under Article 39bis of the Law of 16 March 2000.
- The leave is paid through the social security system (ONEM/RVA/FAK), not by the employer.
- 15 days must be taken immediately after birth (the “first period”), with 5 days remaining (the “second period”) within 4 months.
- The leave is mandatory — the employer cannot refuse it, and the employee cannot be penalised for taking it.
- For adoptions, the same 20-day entitlement applies.
- For multiple births, the leave is extended to 21 days (1 additional day per additional child beyond the first).
The statutory entitlement
Belgian paternity leave was significantly expanded in 2021 from 10 days to 20 days, implementing the EU Work-Life Balance Directive (2019/1158). The entitlement is set out in the Employment Contracts Act and regulated by the National Office for Social Security (NSS/ONSS).
Key rules:
- The leave is 20 calendar days (21 for multiples) from the date of birth.
- The first 15 days must be taken immediately after birth — this is the mandatory first period.
- The remaining 5 days can be taken at any point within 4 months of the birth.
- The leave cannot begin before the birth — the earliest start date is the day of birth.
- The employee must provide a birth certificate to the employer as proof.
- For adoptions and foster care, the same 20-day entitlement applies, starting from the date of placement.
How paternity leave pay works
Paternity leave pay in Belgium is funded through the social security system. The employee files a claim with the employment authority (RVA/ONEM), which processes the payment.
| Component | Detail |
|---|---|
| Duration | 20 days (21 for multiples) |
| Pay rate | 100% of salary (subject to social security ceiling) |
| Payment source | Social security (RVA/ONEM/FAK) |
| Employer obligation | No direct payment — but administrative support required |
| Social security ceiling (2026) | Approx. EUR 6,396/month (confirm annually) |
| Multiple births | +1 day per additional child |
The calculation is based on the employee’s average salary over the 12 months preceding the leave. The payment is capped at the social security ceiling — employees earning above this ceiling receive the maximum amount from social security, and the employer may choose to top up the difference.
The two periods
Belgian paternity leave is structured in two periods, which affects when the leave can be taken:
| Period | Duration | When taken | Mandatory? |
|---|---|---|---|
| First period | 15 days | Immediately after birth | Yes |
| Second period | 5 days | Within 4 months of birth | Optional |
| Total | 20 days | — | — |
The first period must start on the day of birth or the first working day after. The employee cannot defer the first period — it is taken immediately. The second period is more flexible and can be taken at any point within the 4-month window.
Employer obligations
Belgian employers have five core duties around paternity leave:
- Grant the leave — paternity leave is a mandatory right and cannot be refused.
- Process the administrative documentation — the employer provides the employee with the necessary forms for the RVA/ONEM claim.
- Maintain employment terms — position, salary, and seniority are protected during the leave.
- Register the leave in the company’s official records and notify the social security authorities.
- Do not penalise the employee for taking paternity leave — this includes in any redundancy, promotion, or contract renewal decision.
The employer’s role is primarily administrative. Social security handles the payment, and the employer’s obligation is to grant the leave and assist with the documentation process.
Worked example
Pieter works for a financial services firm in Brussels. His wife gives birth on 1 November 2026. Pieter is entitled to 20 days of paternity leave.
First period: Pieter takes his 15 days immediately after birth, starting on 2 November 2026 and returning on 20 November 2026.
Second period: Pieter takes his remaining 5 days starting on 15 January 2027, returning on 21 January 2027 — within the 4-month window.
Pieter’s average salary over the preceding 12 months is EUR 5,000/month. Social security pays Pieter EUR 5,000 / 30 * 20 = EUR 3,333.33 for the 20-day period. His employer does not pay his salary during this period but ensures his position is protected.
Pieter’s wife takes her maternity leave (15 weeks before and after birth) concurrently — both parents can be on leave at the same time.
Common pitfalls
1. Confusing the two periods
The first 15 days must be taken immediately after birth. The remaining 5 days are more flexible. Employers who treat the 20 days as a single block miss the mandatory first-period requirement.
2. Not tracking the 4-month window for the second period
If the employee does not take the remaining 5 days within 4 months of birth, those days are lost. Track this window actively.
3. Assuming the employer pays for paternity leave
Social security pays. The employer’s role is to grant the leave and assist with the administrative process. However, if the employee’s salary exceeds the social security ceiling, the employer may choose to top up the difference — this is contractual, not statutory.
4. Confusing paternity leave with parental leave
Paternity leave (20 days) is separate from parental leave (up to 4 months shared between parents). They are different entitlements with different rules and pay rates.
For more Belgian context, see our guide to annual leave entitlement in Belgium, the overview of types of leave, and our guide to absence management.
Frequently asked questions
How many days of paternity leave does Belgium provide?
Belgium provides 20 calendar days (21 for multiples) of paid paternity leave at 100% of salary. The leave is split into two periods: 15 days immediately after birth and 5 days within 4 months.
Can the employer refuse paternity leave?
No. Paternity leave in Belgium is mandatory — the employer cannot refuse it, delay it, or impose conditions on when it is taken.
When must paternity leave be taken?
The first 15 days must be taken immediately after birth. The remaining 5 days must be taken within 4 months of the birth.
Who pays for paternity leave?
Social security (RVA/ONEM/FAK) pays the employee at 100% of the salary, subject to the social security ceiling. The employer does not pay the salary during paternity leave, though they provide administrative support.
Is paternity leave the same as parental leave?
No. Paternity leave is 20 days at 100% pay. Parental leave is up to 4 months shared between parents, with reduced pay. They are separate entitlements that can both be taken by the same employee.
Managing 20-day paternity leave blocks across two periods — alongside maternity leave, parental leave, and other statutory absences across a Belgian workforce — requires precise tracking. A leave management system that handles the mandatory first period, the 4-month window for the second period, and the social security documentation automatically keeps you compliant.
Sources
- Social Security Belgium — Paternity leave (primary source)
- Article 39bis, Law of 16 March 2000 on parental leave
- ONEM/RVA — Indemnités de paternité
- Fedasil — Congé de paternité
Last updated: 26 July 2026. This article is general guidance, not legal advice. Social security ceilings and payment rates change annually — confirm current figures with the NSS/ONSS and check the applicable collective bargaining agreement (CCT/PCA).