Sick leave in Luxembourg: rules, pay and rights

If you wake up too ill to work in Luxembourg, acting quickly matters: missing notification or medical certificate deadlines can affect your pay or protection from dismissal.

This guide explains the key rules on reporting sickness, medical certificates, sick pay, National Health Hund (Caisse nationale de santé – CNS) requirements, dismissal protection, illness during holidays, cross-border workers, and burnout.

It is general information and not legal, HR, or medical advice, and rules were checked against official sources in August 2026.

Key takeaways

• Tell your employer on day one: Do it in writing if you can, so you keep proof.
• If the absence lasts three days or more, make sure the medical certificate reaches your employer by day three.
• For the first five days, stay at home apart from allowed exceptions. From day six, usual outing windows apply unless your doctor says no.
• Your employer usually keeps paying until the end of the month in which the 77th day falls. After that, the CNS normally takes over cash sickness benefits.
• Dismissal protection and pay are not the same thing: Protection depends heavily on notifying on time and sending the certificate correctly, and it generally lasts up to 26 weeks.

What counts as sick leave in Luxembourg?

Sick leave in Luxembourg is based on incapacity for work due to illness or accident. For employees, this means being unable to work and, where required, providing a medical certificate confirming the incapacity.

This guide focuses on salaried employees covered by Luxembourg’s social security and public health insurance systems, including cross-border workers and expats. Different rules or procedures may apply to self-employed people, public-sector staff, or employees covered by specific collective agreements.

• Tell your employer about your incapacity for work on the first day of absence.
• If the absence lasts three days or more, your employer must receive your medical certificate by the end of the third day.
• For an absence of one or two days, your employer can still require you to justify the absence.
• Cross-border workers are subject to the same core Luxembourg deadline for providing the certificate, although the procedure for obtaining and submitting medical documentation can differ when they live abroad.

Government & Law

Social security in Luxembourg

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Does burnout count as sick leave in Luxembourg?

Burnout or other mental-health symptoms can lead to sick leave if a doctor determines that you are unable to work. This is separate from whether a condition is an occupational disease, which is subject to specific rules on its connection with your work.

If you are struggling with work-related stress or psychological distress, you can speak to a doctor or use support such as CSL Stressberodung, which offers free confidential consultations.

What to do on day one and by day three

First, tell your employer as soon as you know you cannot work. You can give notice verbally or in writing, but keeping written proof, such as an email or message, can be useful if there is later a dispute.

If you cannot notify your employer yourself, someone else can do it for you. Telling a colleague is not necessarily enough: make sure the information reaches your employer or someone authorised to receive the notification.

If your incapacity lasts three days or more, your employer must receive your medical certificate by the end of the third day. You may also need to send the required part of the certificate to the CNS within the applicable deadline.

• Notify your manager or HR on day one.
• Keep a copy or record of the notification.
• Book a medical appointment early if the illness may last.
• Make sure the certificate reaches both the employer and the CNS before the deadline.
• Check the CNS procedure carefully if you are a cross-border worker or you obtained your certificate abroad.

You can read more information on the Guichet government information portal.

How medical certificates, extensions, and eCIT work

On a standard paper certificate, one part goes to your employer, one to the CNS, and one stays with you. For social security purposes the certificate should be established by the third day of incapacity for work at the latest.

If you extend your sick leave, notify your employer on the day you were supposed to return. Send the extension certificate to the CNS within the applicable two-day deadline and make sure your employer receives it by the end of the third day of the extended period.

If you are urgently hospitalised, you have eight days from hospitalisation to provide the medical certificate to your employer. Keep copies and proof of sending.

When you return after an uninterrupted absence of more than six weeks due to illness or accident, your employer must notify the occupational doctor, who decides whether you need a medical examination.

eCIT is Luxembourg’s electronic certificate of incapacity for work. If your doctor issues an eCIT, you can consult it in your private MyGuichet.lu eSpace and transmit it electronically to the CNS and your employer.

If electronic transmission is unavailable, you see no confirmation of receipt, or your doctor practises abroad, use the usual submission method and make sure you still meet the legal deadlines.

What you can and cannot do while on sick leave

This is where people often have difficulties. During the first five days of sick leave, you generally have to stay at your declared address, apart from necessary medical visits and the specific exception for eating a meal outside after notifying the CNS.

What you can do:

• Stay home for days one to five, unless you need medical care or another official exception applies.
• Follow the permitted outing hours from day six (10.00 to 12.00 and 14.00 to 18.00) provided your doctor has authorized outings.
• Keep your activities compatible with recovery.
• Declare any temporary address if you stay with family, a partner, or away from home.

What you cannot do:

• Do not assume a quick errand is allowed during the first five days.
• Do not assume you can go out during evenings.
• Do not work elsewhere or play sport unless you have prior medical agreement.
• Do not do activities incompatible with your state of health.
• Do not forget that control visits and CNS checks may happen between 8.00 and 21.00.

Breaking the rules can have consequences. Depending on the circumstances, the CNS can impose sanctions, and can suspend sickness benefits in certain cases, including an unauthorised stay abroad.

Can you leave home or travel abroad while off sick?

Limited outings are permitted under the rules above, but travelling or staying abroad is much more restricted. In principle, your country of stay while on sick leave should be the same as your country of residence, and staying abroad generally requires prior CNS authorisation unless a specific exception applies.

Do not travel on the assumption that a doctor’s approval or ordinary permitted outing hours are enough. Check the current CNS rules on authorised absences and stays abroad before making plans, as unauthorised stays abroad can affect your sickness benefits.

Sick pay and dismissal protection in Luxembourg

Sick pay and protection from dismissal are related, but they follow different rules. Dismissal protection depends particularly on meeting the notification and medical certificate deadlines, while sick pay follows the salary-continuation and CNS benefit rules.

For most employees, the employer continues full salary until the end of the month in which the 77th sick day falls. The 77 days are calendar days across a rolling 18-month reference period. From the following month, the CNS normally takes over payment of sickness benefits for any continuing or subsequent qualifying incapacity.

One important distinction is that submitting a certificate late can affect your protection from dismissal without automatically cancelling your right to pay. Guichet.lu states that, during the Lohnfortzahlung period, salary can still be due for the period covered by a medical certificate even if the employer receives it after the three-day deadline.

• Pay continuation: based on qualifying periods of incapacity and the 77-day rule.
• Dismissal protection: normally requires notifying your employer on day one and ensuring they receive the medical certificate within the required deadline.
• Possible consequences: late notification, missed medical checks, or breaches of CNS rules can affect your labor rights, but the consequences depend on the particular rule involved.

Labor Law

Employment law and labor rights in Luxembourg

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What happens after the 77th day or after 26 weeks?

Once you reach the 77-day threshold, the employer continues paying until the end of that calendar month. The CNS normally takes over sickness benefits from the first day of the following month for subsequent qualifying periods of incapacity.

Dismissal protection follows a separate timetable. If you have met the notification requirements, you have protection during your incapacity for a maximum of 26 weeks from its start. After that period, the special sick-leave protection no longer prevents the employer from terminating the employment contract, although the usual dismissal rules still apply.

Cross-border workers and getting sick on holiday

If you live in France, Belgium, or Germany but work in Luxembourg, the same core Luxembourg sick leave rules still apply. That includes notifying your employer and meeting the medical certificate deadlines, even a doctor in your country of residence issues your certificate.

The paperwork can differ depending on where you live. French, German, and Belgian medical certificates have different formats, so check how to send the required information to both your employer and the CNS.

If you become ill during annual leave while you are in Luxembourg, send your employer a medical certificate within three working days. If you are abroad when you become ill, inform your employer as soon as possible.

Days of annual leave covered by the medical certificate are treated as sick leave rather than holiday. You can take those annual leave days later, but the new dates must be agreed with your employer.

Writer

Gary Buswell

Insider Tip

If you stay with a partner, relative, or anyone else while off sick, tell the CNS your exact temporary address and the details it requires for your host. This matters because administrative checks can be carried out at the address you have declared.

Employment Basics

Becoming a cross-border worker in Luxembourg

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Common mistakes that can cost you pay or protection

• Telling only a colleague: your employer may not be treated as properly informed.
  Fix: notify your employer or an authorised representative directly and keep a record.
• Sending the certificate late: you may lose your protection against dismissal even if you were genuinely ill.
  Fix: send it early and keep proof of delivery.
• Confusing burnout with occupational disease: being medically unfit for work and having a condition formally recognised as an occupational disease are separate issues.
  Fix: get medical advice and check the relevant rules.
• Ignoring outing or travel restrictions: breaking CNS rules can lead to sanctions and, in some circumstances, suspension of sickness benefits.
  Fix: check CNS rules before you leave home or the country.
• Not declaring where you are staying: you could miss a CNS control visit if you are staying somewhere other than your usual address.
  Fix: give the CNS your temporary address and any required host details promptly.

Useful resources

(checked 17 August 2026)

• Guichet.lu incapacity for work and medical certificates – day one notice, day three certificates, urgent hospitalisation, holiday illness, outings, and dismissal protection
• Guichet.lu continuation of pay – the 77th day rule, the 18-month reference period, and when CNS payments take over
• CNS progressive return to work – therapeutic return conditions, pay handover, and what changes during a phased return
• eCIT and CNS information – electronic certificates and MyGuichet.lu submission checks
• CSL Stressberodung – confidential support with stress, burnout, or workplace pressure