Flexi-jobs and student work are two of the most practical ways Belgian SMEs handle seasonal peaks, weekend cover and holiday staffing. Both statuses come with genuine advantages for employer and worker alike, but they also bring a distinct set of obligations around Dimona declarations, working-time limits and record-keeping. Getting these wrong can result in NSSO corrections and social inspection findings, even when the underlying work was entirely legitimate.
Dimona: the right declaration type for each status
For both flexi-job workers and students, a Dimona declaration must be submitted before the worker starts. That rule is straightforward in principle, but errors in declaration type and timing are among the most common compliance gaps inspectors encounter.
Flexi-job Dimona (type FLX): You can declare per day or per period. A daily declaration specifies the planned start and end time. A period declaration covers a maximum of one week and requires the employer to track the actual hours worked separately, either in the flexi contract itself or in a dedicated registration system.
Student Dimona (type STU): Student work operates under a quarterly contingent of 600 hours per calendar year, at a reduced solidarity contribution rate. The Dimona declaration states the planned number of hours for the full contract. Exceeding 600 hours has immediate consequences for contributions owed by both the student and the employer, so monitoring the running total is essential.
A late or incorrect Dimona is treated by the social inspectorate as evidence of undeclared work, even if wages are later paid in full. Timely declaration is not a formality: it is the legal foundation of the employment relationship.
Working-time limits and scheduling practicalities
Flexi-job workers remain subject to the ordinary working-time rules: 8 hours per day and 38 hours per week as the standard reference, with the usual overtime pay rules when those thresholds are crossed. What distinguishes the flexi-job status is its supplementary character: the worker must already hold a main employment contract representing at least four-fifths of a full-time position. The NSSO verifies this condition automatically when processing the Dimona.
Students typically work part-time and on varying schedules. Their employment arrangement must be recorded in writing, including either fixed hours or, where the schedule is variable, the boundaries within which hours will be planned. Do not overlook daily rest and break entitlements: a student working more than six hours in a day is entitled to a break, and the 11-hour daily rest period applies regardless of contract type.
For employers juggling multiple departments and rotating shifts, tracking all these variations in a spreadsheet quickly becomes a liability. A digital scheduling tool lets you build and manage rosters per team or department and link planned hours directly to recorded actuals, reducing the gap where compliance errors hide.
What records must you keep, and for how long?
Belgian employment law requires employers to maintain working-time records for all workers, including flexi-jobs and students. In practical terms, that means:
- The start and end time of every working period, recorded per day.
- Any breaks deducted from working time.
- Consistency with the Dimona declaration: recorded times must either match the declared data or be accompanied by an explanation for any difference.
- For students specifically: a running log of hours consumed against the 600-hour annual contingent.
These records must generally be kept for five years. During an inspection, the labour inspector will want to cross-reference time records with contracts and Dimona history quickly. Being able to produce an inspector-ready export in minutes is not a nice-to-have: it can be the difference between a clean inspection and a drawn-out investigation.
The coming mandatory electronic time registration, expected to cover all sectors by 2027, will apply to flexi-jobs and student workers too. Employers who build compliant digital habits now avoid a costly scramble later. Tikkit server-stamps every clock-in and clock-out, ties it to the correct worker and employment status, and tracks the student contingent so you always know how many hours remain before a worker crosses the 600-hour threshold.
Common mistakes and how to avoid them
- Late Dimona: Always submit before the worker starts, including for a single extra shift arranged at short notice.
- Overlooking rest rules: Short shifts are not exempt from working-time law. A student doing a four-hour Saturday shift still falls under the legal framework.
- No written contract for students: A verbal agreement is not sufficient. The schedule or the variable working-time boundaries must be set out in writing.
- No contingent tracking for students: Check the remaining balance before each new engagement, using either the student card system or your own registration tool.
Flexi-jobs and student work offer genuine flexibility for Belgian SMEs. With clear processes and the right tools in place, the administration around them does not have to be a burden: it becomes a straightforward part of how you run your workforce.
This article is general information, not legal advice. Always verify your situation with your social secretariat or a legal adviser.