Managing leave requests in shift work: a practical guide

A leave request is one line in a mailbox. In a shift operation it is also, immediately, a gap in the night shift, a stand-in building up overtime and a roster that has to be redone. Anyone managing leave with an Excel tab and a WhatsApp group only finds that out during the week itself.

Below we set out the Belgian ground rules on annual holidays, followed by a concrete system for managing leave requests without your planning collapsing under the weight.

Why leave hurts more in shift work

In a classic office environment, a colleague picks up the work. In a care unit, a production line or a warehouse that is not the case: someone has to be physically present. Three mechanisms make it difficult:

• Minimum staffing levels. In a department with 24 employees and three shifts a day, you often cannot release more than two or three people at the same time without hiring agency staff.
• Skills, not headcount. Two nurses do not replace a forklift driver with a reach truck certificate. Your days off have to add up per role, not per total.
• Peak periods. In logistics and retail, the busiest period (Q4) falls just before the deadline by which remaining holiday days must be taken. That is a built-in clash.

The Belgian basics: who decides when your team takes holidays

A full-time employee who worked the whole of the previous year (the holiday accrual year) is entitled, in the holiday year, to 20 statutory holiday days in a five-day week. Those days are built up on the basis of last year — not the current year. On top of statutory holidays there are other schemes (additional or "European" holidays, youth holidays, senior holidays) and, in many sectors, extra ADV (working time reduction) or seniority days through a collective labour agreement.

When it comes to fixing dates there are two routes, and the distinction matters:

• Collective closure. The dates are set by the joint committee or, if nothing has been agreed there, at company level through the works council or the trade union delegation. Once there is an agreement, you include those dates in the work rules.
• Individual holidays. These are fixed by mutual agreement between you and the employee. So you cannot impose leave unilaterally, but the employee cannot demand it unilaterally either (see socialsecurity.be).

That "mutual agreement" is precisely where things go wrong. Without clear arrangements it becomes whoever-emails-first, with frustration among the shifts stuck in the weekend roster.

New employees and additional holidays

Anyone starting or returning after a break has not yet built up full holiday entitlement. After a run-in period of three months of work in the same calendar year, such a person can take additional (European) holiday days, paid via an advance on the following year's double holiday pay. In practice that means: a student worker who starts with you in September is not left completely high and dry — but you do have to track those days separately, because they sit in a different pot from statutory holidays.

Ill during holidays: the rule since 2024

Since 1 January 2024, an employee who becomes unfit for work during their annual holidays no longer loses those holiday days. Performance of the employment contract is suspended by the incapacity for work and the holiday days are retained to be taken later (FPS Employment).

Two consequences for your administration:

1. You need a certificate and a notification. The employee has to inform you and provide a medical certificate, even if they are abroad. Without a record of that certificate you will not be able to explain later why days are still outstanding.
2. Carry-over is compulsory in certain cases. If, because of the suspension, the employee can no longer take those days within the holiday year, they may be carried over for up to 24 months after the end of that holiday year. In that situation, you as the employer may not refuse the carry-over.

So the classic rule largely stands — holidays are taken within the holiday year — but with an exception you have to be able to demonstrate per employee. That is exactly the kind of detail that gets lost in a shared Excel file.

Six arrangements that make your leave policy workable

No legal acrobatics needed. Clarity, though — and that is best set out in the work rules or an annex:

• Request windows. Summer holidays before 31 March, the Christmas period before 31 October. Requests within the window are handled together, not in order of arrival.
• Quotas per shift and per skill. For example: a maximum of 2 out of 8 people per early shift, a maximum of 1 forklift driver, at least 1 supervisor present.
• A rotation principle for the scarce weeks. Whoever got the construction industry holiday weeks or the week between Christmas and New Year last year goes to the back of the queue this year. Many companies also give priority to employees with school-age children — set out how you weigh that up.
• Leave freezes communicated early. A stocktaking week in industry or the peak weeks in November: name them in January, not in October.
• One decision deadline. For example: every request gets an answer within 5 working days. Unanswered requests are the single biggest source of conflict.
• Balance checks in the autumn. From September onwards, review monthly who still has too many days outstanding, so that you are not missing half a department at once in December.

From request to roster in one flow

The real gain is not in the policy but in the link-up. A leave day that gets approved has to do three things at once: reduce the balance, make the employee unavailable in the planning, and become visible to whoever has to fill the shift.

In Forganiser, an employee submits their request digitally, on approval you immediately see whether you still meet your minimum staffing level, and that person automatically disappears from the available pool for those days. The balances per leave type — statutory holidays, additional holidays, ADV days, compensatory rest — run along in HR management, so that in November you know exactly who still has what outstanding. If you then still have to adjust the roster, bear in mind the notification rules: we set these out in changing a work schedule: what does Belgian law say?.

A practical example from healthcare: a department with 24 employees and a quota of 3 simultaneous leave days per shift. If a fourth request comes in for the same week, you see it at the point of submission — not after you have already approved it. The team leader does not have to reverse anything, and the employee is offered an alternative straight away.

Three mistakes that will cost you dearly

• Mixing up leave and compensatory rest. Compensatory rest for overtime or for exceeding working time limits is not a holiday. Anyone who puts both on the same pile loses sight of their overtime balance — see also maximum working time in Belgium.
• Verbal approvals. "But we agreed that in the canteen" is not a record. Log every approval with a name and a date.
• Forgetting to convert part-timers pro rata. Someone working 3 days a week does not have 20 days. Calculate in hours or in days-per-working-regime, and do it consistently for the whole team.

Start with your busiest week

You do not need a whole new policy to make progress. Take the week that went most off the rails last year, determine your minimum staffing level per shift and per skill, and put a quota on it. Communicate one request deadline. Record everything in one place, linked to your planning and your HR administration.

Then a leave request is once again what it should be: one line, with an answer within the week.