A sick child needing a parent at home: how many days by age, the certificate due from day one, who pays the salary and why the Mutualité refunds the lot. The employer's guide for a Luxembourg SME.
In short. Leave for family reasons lets an employed parent take time off to look after a sick child under 18 whose condition requires their presence. The entitlement is counted per child and per age band: 12 days up to age 4, 18 days from 4 to 13, 5 days from 13 to 18 in the event of hospitalisation. The employee tells the employer the same day and provides a medical certificate, even for a single day. The employer advances the salary, but the Employers' Mutual Insurance refunds the full cost, employer charges included, not 80 % as for ordinary sickness. During the absence, the employee is protected against dismissal. A cross-border worker has exactly the same rights.
A colleague calls at 7.30 a.m.: their child is ill and they will not be in. For the employer, three questions land at once. Are they allowed to be away, and for how long? Is a certificate needed? And above all, who pays for that day. Leave for family reasons answers all of this, and its payroll mechanics hold a pleasant surprise that many owners miss. Here, for a Luxembourg SME, is how this leave works, on the employee's rights as much as on the company's obligations and cash flow.
What is leave for family reasons?
Leave for family reasons is an authorised absence that lets a parent stay with their sick child when the child's health requires it. It is not a convenience day: it assumes an illness confirmed by a doctor, and it is open to the parents of a child under 18. It keeps the employee's income going, and it protects them against dismissal during the absence.
The right is open to employees, whether on fixed-term, open-ended or probationary contracts, to apprentices, and to self-employed people affiliated with the Employers' Mutual Insurance. Where both parents work, each has their own entitlement, but they cannot take the leave at the same time for the same child. As with the other family-related leaves, there is no residence condition: a cross-border worker living in France, Belgium or Germany has the same rights as a resident, as long as they are affiliated in Luxembourg.
How many days, by the child's age?
Here is the Luxembourg specifics to keep in mind: the leave is not a fixed yearly quota, but is counted per child and per age band. Each band opens a fresh allowance, usable while the child is in that band.
| Child's age | Days per child |
|---|---|
| From 0 to under 4 | 12 days |
| From 4 to under 13 | 18 days |
| From 13 to under 18, in the event of hospitalisation | 5 days |
Two important adjustments. For a child receiving the special supplementary allowance, aimed at children with a lasting impairment, the leave is doubled, and the hospitalisation condition and the 18-year limit no longer apply. And in serious situations, such as an evolving cancer, a hospital stay of more than two weeks or a quarantine, the leave can be extended, up to a limit of 52 weeks over a reference period of 104 weeks.
The leave can be taken in parts, which is often the most useful in practice: a half-day to take the child to the doctor, then back to work. A portion of four hours or less counts as a half-day.
Notice and proof: the employee's obligations
The logic mirrors sick leave, but tighter. The employee must tell their employer the same day as the absence, by word or in writing, in person or through someone else. A short message stating the absence and its reason is enough at this stage.
Then comes the medical certificate, required even for a single day's absence, unlike ordinary sick leave where company practice can waive it for one or two days. The certificate goes to the employer as soon as possible, ideally the next day, and to the National Health Fund by the third day of absence at the latest. It must carry the 13-digit national ID numbers of the child and the parent, confirm the illness, the need for the parent's presence and the duration. The remaining balance of days can be viewed at any time on MyGuichet.
Who pays, and why the Mutualité refunds everything
As with sickness, the employer keeps paying the salary during leave for family reasons: the employee loses nothing. But this is where the real difference lies, and it works in the company's favour.
Leave for family reasons is treated as a period of incapacity for work, and the Employers' Mutual Insurance refunds the employer the full amount of the advanced pay, employer contributions included, provided the leave was properly declared. That is a world away from the 80 % refunded for ordinary sickness: here, handled well, the net cost to the business tends towards zero. The catch is procedural: the employee sends the certificate to their health fund, and the employer declares the absence to the Joint Social Security Centre (CCSS). An undeclared leave is a lost refund.
Two useful points. If the employee has used up their continued remuneration, that is, beyond the 77th day of incapacity over eighteen months, the CNS pays the allowance directly. And the allowance is capped at five times the social minimum wage; for an apprentice, it is calculated on the apprenticeship allowance.
Getting family-reasons certificates and not sure the Mutualité refunds are actually coming back? We will put your payroll and filings straight.
Review your payrollProtection against dismissal
Because it is treated as incapacity for work, leave for family reasons carries the same protection against dismissal: during the covered absence, the employer can neither notify a dismissal nor call the employee to the preliminary meeting. A dismissal issued despite this protection exposes the business to a reinstatement claim or an action for unfair dismissal.
That protection has the same limits as for sickness. It does not apply if the employee did not give notice the same day, did not provide the certificate, or sent it after receiving a summons or a dismissal letter, nor in the event of gross misconduct. It also does not stop a fixed-term contract reaching its natural end. Finally, if the child's illness occurs during the trial period, that period is extended by the length of the leave, up to one month. The general rules on ending a contract are set out in our guide to dismissal in Luxembourg.
What this leave changes for your payroll and your books
On paper, leave for family reasons is neutral for the business: you advance, the Mutualité refunds everything. In practice, that neutrality only happens if three things are handled cleanly. The declaration of the absence to the Joint Social Security Centre, without which there is no refund. The tracking of the refund, file by file, to check the money really comes back into cash flow. And the right payroll treatment, since these days are not ordinary paid leave and show up differently on the payslip.
This is exactly the kind of event that is handled badly by hand and well when payroll and accounting live in the same system. At Advena, the absence is declared, the expected Mutualité refund is tracked like a receivable, and it all feeds into the Odoo where we keep your books, in real time. You keep a readable payroll even when it shifts with absences. This logic extends the one we set out in our guide to outsourcing payroll in Luxembourg, and it rounds out the other leaves we cover, from parental leave to sick leave.
Said plainly: the real constraint is scheduling
One honest point to close on. While the salary cost of leave for family reasons is, handled well, close to zero, its constraint is real: these absences are unpredictable, sometimes repeated through the school-winter months, and they cannot be refused. For a team of three or four, a key person's absence on a closing day is hard to plan around. The full refund protects your cash flow, not your schedule. Building in cover and documenting critical tasks remains the only real defence; ignoring it does not make the problem go away.
Frequently asked questions
How many days of leave for family reasons per child in Luxembourg?
The entitlement is counted per child and per age band: 12 days up to age 4, 18 days from 4 to 13, and 5 days from 13 to 18 in the event of hospitalisation. This allowance is doubled for a child receiving the special supplementary allowance, and can be extended in serious situations.
Is a medical certificate needed for a single day?
Yes. Unlike ordinary sick leave, leave for family reasons requires a medical certificate even for a single day's absence. It goes to the employer as soon as possible and to the National Health Fund by the third day at the latest.
Who pays the employee during leave for family reasons?
The employer keeps paying the salary, then the Employers' Mutual Insurance refunds the full amount advanced, employer charges included, provided the leave was declared. Beyond the 77th day of incapacity over eighteen months, the CNS pays the allowance directly.
Can an employer refuse leave for family reasons?
No. As long as the child is under 18, the illness is confirmed by a certificate and the employee gave notice the same day, the leave is a right. The employer cannot refuse it, and the employee is protected against dismissal during the covered absence.
Is a cross-border worker entitled to it?
Yes. There is no residence condition. A cross-border worker affiliated with Luxembourg social security has the same rights as a resident, with the same notice and certificate obligations.
Read on
- Sick leave in Luxembourg: pay, medical certificate and protection
- Parental leave in Luxembourg: what employers need to know
- Paid leave in Luxembourg: 26 days, accrual and carry-over
- Outsourcing payroll in Luxembourg: who, how, how much
- Accounting firm in Luxembourg: the complete guide for an SME
- What an accounting firm costs in Luxembourg: fixed fee and hidden extras
Why Advena?
We keep the accounts and payroll of Luxembourg SMEs of 1 to 50 employees inside the management tool we deploy ourselves, on a fixed fee from 325 € per month, all in. On leave for family reasons, that means three concrete things: we declare the absence to the Joint Social Security Centre to secure the refund, we track that Employers' Mutual Insurance refund file by file, and these movements feed into the Odoo where we keep your books, in real time. We inform on the rules; for an individual situation, the CNS and Mutualité statements stay the reference.
Accounting, VAT, annual accounts and payroll in a single fee announced upfront. Let's talk about your file.
Request your fixed feeInformation current as of October 2026, based on the rules published by Guichet.lu on leave for family reasons and by the National Health Fund. As these rules can change and every situation is specific, this article is informational and not individualised legal, tax or social advice.
