Sick leave in Belgium costs employers more than in most neighbouring countries: 30 days of full salary paid by the employer before any form of state support applies. For a company with 50 workers, even a modest absenteeism rate translates to tens of thousands of euros in direct salary costs. That is why Belgian HR managers increasingly rely on Suivo’s workforce management solution to track working time and absence patterns in the same system, surfacing problems before they become payroll crises. Here is what Belgian law requires, what you must record, and how to stay in control.
The Belgian sick leave framework: who pays what and when
Belgian sick leave operates in three phases, each with different financial and administrative obligations for the employer.
Phase 1 – Gewaarborgd loon (guaranteed wage): days 1-30
The employer pays the employee’s full normal salary (100%) during the first 30 calendar days of any illness or accident. There is no state support during this period. This applies to blue-collar workers (arbeiders) after one month of service and to white-collar workers (bedienden) immediately. The FPS Employment website publishes the current rules and the distinction between worker categories.
Phase 2 – Mutual insurance (mutualist / ziekenfonds): from day 31
After 30 days, the employee’s health insurance fund takes over payment at approximately 60% of the capped reference wage. The employer’s direct financial obligation ends.
Phase 3 – Long-term illness: after 12 months
If the employee is still unable to work after one year of continuous illness, INAMI/RIZIV (the national health and invalidity insurance institute) becomes the primary payer and a re-integration trajectory becomes mandatory.
Accurate absence tracking matters in all three phases: in phase 1 to control costs and verify the medical basis; in phase 2 to manage payroll correctly; and in phase 3 to comply with re-integration obligations.
What you must record from day one
Dimona sick declaration: From the first day of illness, you must file an updated Dimona declaration with the correct absence code. This is an obligation under Belgian social security law. Late or missing sick Dimona declarations are a common finding in NSSO social inspections.
Medical certificate: In most employment contracts and work regulations, a worker must submit a medical certificate on the first day of illness – or within a specified number of days. Some collective agreements allow workers to self-declare for short absences (typically 1-3 times per year without a certificate); check your sector’s CAO.
Return to work: When the worker returns, you must close the sick period in Dimona (declaring the return date) and in your time registration system. A gap between the Dimona end date and the actual return date creates a discrepancy that NSSO auditors flag.
Re-integration trajectories: what Belgian law requires
Since 2017, Belgian law has required employers to develop a formal re-integration plan for workers absent for more than 4 weeks or expected to be absent long-term. The trajectory involves the company doctor (arbeidsgeneesheer), the mutualist case manager, and the employer. From 2022, the rules were tightened: trajectories must start earlier and employers who do not cooperate can face sanctions.
A time tracking system that records actual hours worked supports re-integration: when a worker returns on a reduced schedule as part of their trajectory, the platform tracks whether they work the agreed hours and whether additional overtime is inadvertently requested – a common mistake that can void the trajectory.
How digital tracking exposes absence patterns
Paper absence management hides patterns that a digital system surfaces automatically.
| Pattern | What it signals | How digital tracking reveals it |
| Repeated Monday absences | Possible weekend extension | Automated alert when the same day repeats across weeks |
| Absences before or after public holidays | Possible abuse of gewaarborgd loon | Calendar-aware flagging |
| Short, frequent absences (1-2 days, multiple times per year) | Possible work-related stress | Absenteeism rate per worker, auto-calculated |
| Absences during project-heavy periods | Work pressure signal | Cross-reference with project schedule |
Belgian HR benchmarks published annually by providers such as Securex and Mensura show that the average Belgian absenteeism rate is around 7-8% of planned working time. Suivo’s workforce management platform calculates your actual rate in real time, broken down by team, site, or worker profile, so you can compare against your sector average and intervene before short-term patterns become long-term problems.
Calculating the true cost of absence
The visible cost of absence is the salary paid during gewaarborgd loon. The less visible costs are replacement staff or overtime for colleagues covering the absent worker, lost productivity, recruitment costs if the worker does not return, and administrative time managing the Dimona declarations, medical certificates, and re-integration paperwork.
A workforce management platform that integrates with your HR system lets you run an absence cost report combining all these factors – giving your finance director a number, not a feeling, for the true cost of your absenteeism rate.
The connection between time registration and absence management
Time registration and absence management are two sides of the same data: time registration records when someone is working; absence management records when they are not. A system that handles both eliminates the manual reconciliation between planned hours, actual hours, and absent hours that payroll teams spend days on each month.
When a worker calls in sick, the supervisor updates the time registration system, the Dimona declaration is triggered, the gewaarborgd loon period starts, and the payroll export to SD Worx, Acerta, or Partena reflects the correct status automatically.
Ready to get absence management under control?
Suivo helps Belgian companies track working hours and absences in one system, with automatic Dimona support and the reporting tools to manage your absenteeism rate against sector benchmarks.
