Sick leave and continued pay in Luxembourg: 77 days

Sick leave and continued pay in Luxembourg: who pays what?

Sick leave and continued pay in Luxembourg work on one rule: the employer maintains the employee's full salary during incapacity for work until the end of the calendar month in which the seventy-seventh day of incapacity falls, over a reference period of eighteen consecutive months. From the following month, the Caisse nationale de santé takes over and pays the sickness cash benefit.

The system has three tiers, and confusing them distorts both the payroll and the cash position. The employer advances the salary. The Mutualité des employeurs reimburses it, in principle, 80 % of the total wage cost, meaning gross pay plus employer contributions. The Caisse nationale de santé steps in only once the continued-pay period is exhausted, and from then on it indemnifies the employee directly.

The length of the reference period has not always been what it is now. It ran for twelve months until the law of 10 August 2018 extended it to eighteen months with effect from 1 January 2019. Payroll procedures written before that date, or imported from a foreign group, therefore still compute the switch over too short a window, which shifts the burden to the Caisse nationale de santé earlier than it should.

When we take over a file, we regularly see payrolls where the 77th day has passed without the switch being made: the employer keeps paying a salary the Caisse nationale de santé should have indemnified, and the Mutualité des employeurs does not reimburse a cost that was no longer the employer's. The correction sometimes reaches back over several months of payslips, with as many contribution adjustments.

How is the 77th day of incapacity for work counted?

The 77th day of incapacity in Luxembourg is counted in calendar days, weekends and public holidays included, adding together every period of incapacity falling inside the rolling eighteen-month window. The check is monthly, and the counter resets to zero when the employee changes employer.

Two practical consequences follow. The first is that a long absence is not needed to reach the threshold: short, repeated absences added up over eighteen months get there too, and that is precisely the pattern payrolls track least well. The second is that the count does not stop at working days: an absence from Friday to Monday uses up four days of the counter, not two.

The switch itself never happens mid-month. What moves the burden is not the 77th day but the end of the calendar month in which that day falls. An employee reaching the 77th day on the 3rd of a month therefore stays on the employer's payroll until the last day of that same month, close to four weeks of salary that imported procedures wrongly charge to health insurance.

What must the employee do, and within what deadlines?

An employee unfit for work in Luxembourg must notify the employer on the very day of the impediment, personally or through a third party, then deliver a medical certificate by the third day of absence at the latest. Meeting both obligations is what secures protection against dismissal.

First-day notification is subject to no particular form: it may be oral or written, and Guichet.lu accepts email, fax and text message. The certificate comes in two parts, one for the Caisse nationale de santé and one for the employer. The three-day deadline is a strict deadline that cannot be extended, and its last day expires at midnight, so a delivery made outside office hours is still valid.

One divergence is worth knowing before drafting internal rules. The Inspection du travail et des mines draws no distinction, within that deadline, between Sundays and non-working days, while the Caisse nationale de santé refers to the third working day. The prudent reading, and the one we apply in payroll files, is to count calendar days. For absences of one or two days, the employee may also be exempt from producing a certificate depending on established company practice.

The next milestone is digital and it has a date. The Caisse nationale de santé announces that digital transmission of incapacity certificates, the eCIT, will be mandatory from 1 January 2027 and that non-compliant certificates will no longer be accepted from that date. On the employer's side, electronic receipt requires a business eSpace on MyGuichet.lu with the "Remuneration and incapacity for work" domain activated; without it, the employee must keep handing over a printed version.

What must the employer declare to the Centre commun de la sécurité sociale?

A Luxembourg employer declares each employee's periods of incapacity to the Centre commun de la sécurité sociale within ten days of the end of the month, together with the salary declaration, either on a form or through SECUline. No declaration is required where the incapacity does not exceed two working days.

The content of the declaration is standardised, and that is where reimbursement blockages arise. It carries the thirteen-digit social security number, the employee's surname and first name, the start and end dates of the continuous absence, the type of incapacity and, since 1 January 2020, the exact number of hours of absence. The hours claimed may not exceed the working hours declared: beyond that, reimbursement is blocked, and stays blocked until corrected.

This monthly declaration is not a statistical formality. It is from that declaration, cross-checked against the medical certificates sent in by the employee, that the Caisse nationale de santé establishes the total number of days of incapacity and therefore who must pay the salary for a given month. A late or inaccurate declaration mechanically moves the 77th-day switch, with the contribution adjustments that follow.

Two conditions frame the declaration: the employee must have been affiliated to social security and the employer must have been notified of the incapacity, which puts first-day notification back at the centre of the process. And where the certificate was not sent to the Caisse nationale de santé, the Centre commun de la sécurité sociale may ask the employer for the original.

How does the Mutualité des employeurs reimburse the cost?

The Mutualité des employeurs reimburses a Luxembourg employer 80 % of the total wage cost paid during the continued-pay period, meaning gross pay plus employer contributions, and 100 % in three cases: incapacity arising during the first three months of a probation period, leave for family reasons and carer's leave.

Membership is not optional for an employer: the Mutualité is the mechanism through which the cost of continued pay is mutualised across businesses. The contribution, however, is not uniform. Employers are split into four classes according to their financial absenteeism rate, calculated by dividing the amounts reimbursed to them for incapacity for work by their contribution base. Reclassification takes place each year before 1 December.

The classification thresholds are stable and verifiable: below 0.65 % for class 1, from 0.65 % to below 1.60 % for class 2, from 1.60 % to below 2.50 % for class 3, and 2.50 % or more for class 4. The contribution rates attached to those classes, by contrast, are set each December by the board of the Mutualité, subject to ministerial approval. We therefore do not reproduce a 2026 rate table here: the applicable rate is the one on the company's classification notice, and the orders of magnitude in force are set out in our article on social parameters.

The mechanism has a management consequence smaller businesses often miss. Because the rate depends on the company's own past financial absenteeism, a year of long absences is paid for twice: once in cash, through the 20 % not reimbursed, and again the following year, through reclassification into a higher class. Incapacity arising during the first three months of probation is, for its part, excluded from the contribution calculation.

Is the employee protected against dismissal while off sick?

A Luxembourg employee unfit for work is protected against dismissal for up to twenty-six weeks from the day the incapacity arises, provided first-day notification and delivery of the certificate within three days have been complied with. During that period the employer may not notify any termination, not even for serious cause.

The protection is broader than a mere ban on dismissal. It also covers the summons to the preliminary interview, which deprives the employer of the first step of the procedure and explains why dismissals notified during an absence are held unfair on that ground alone. It does, however, assume that the employee's information duties are complied with on each extension of the absence, not only on the first certificate.

Once the twenty-six weeks are over, the employer recovers the ability to dismiss, but not an automatic ground for dismissal. An absence of twenty-six weeks does not in itself justify termination: real and serious grounds are needed and, in practice, proof of the disruption caused to the running of the business. A decision cited by the Inspection du travail et des mines, delivered at a public hearing on 7 July 2025, further confirms that the protection does not extend beyond those twenty-six weeks, even where an appeal is pending against a refusal decision of the Caisse nationale de santé.

How this meshes with the notice period is the point we most often see handled wrongly. The protection bites on notification, not on a notice period already running: an employee who falls sick after notification stays under notice. The reverse also holds, and it is the source of the litigation: a certificate reaching the employer before notification defeats the dismissal, whatever the date on which the letter was drafted.

Sickness cash benefit: duration, floor and ceiling

The sickness cash benefit paid by Luxembourg's Caisse nationale de santé takes over from the salary from the month following the end of the continued-pay period. Entitlement is capped at a total of 78 weeks over a reference period of 104 weeks, and the monthly benefit may neither fall below the minimum social wage nor exceed five times it.

Both bounds are computed from the monthly minimum social wage for an unskilled worker, EUR 2,771.33 at the applicable index, which puts the monthly ceiling of the benefit at EUR 13,856.65. For a senior employee paid above that ceiling, the switch to the Caisse nationale de santé is therefore not neutral: it produces a loss of income that neither the employer nor the Mutualité makes good, and that is a point to explain before the 77th day, not after. The amounts and the index in force are set out in our article on the minimum social wage.

The 78-week count does not cover sickness alone. Periods of sickness, occupational disease and accident at work falling inside the 104-week reference period are added together, while periods of maternity leave and exemption from work are not. An employee who has had an accident at work followed by a long illness may therefore hit the limit faster than the simple sum of their sick leave would suggest.

An intermediate device exists, and it is used too rarely. Phased return to work for therapeutic reasons, provided for by article 14bis of the Social Security Code, requires at least one month of incapacity within the three months preceding the request, an incapacity still ongoing, a medical attestation and the employer's agreement; it starts only once the Caisse nationale de santé agrees, on the advice of the Contrôle médical de la sécurité sociale. The employee remains treated as fully unfit for work throughout, and the period counts in full towards the 78-week cap.

In an outsourced payroll file, this monitoring fits into one monthly control line: the counter of days of incapacity over eighteen months, the anticipated switch date, the Mutualité's reimbursement checked against the Centre commun de la sécurité sociale statement. The order of magnitude of the fees is in our pricing grid; what makes it vary is not the number of absences, it is the quality of the declarations already filed.

Sources and verification

Written for Financial Services Luxembourg and reviewed before publication by Mickaël LOC, licensed accountant (authorisation 10077274). The documentary review dated 10 October 2026 relies on the accessible sources identified below. Points not confirmed against primary texts are explicitly identified in this section.

The sources consulted are as follows, all read on 10 October 2026.

On Guichet.lu, the page on continued payment of salary during an employee's incapacity for work gives the maintenance of salary until the end of the calendar month of the 77th day, the reference period of eighteen consecutive months, the handover to the Caisse nationale de santé from the following month, the monthly check of the counter and its reset on a change of employer, the reimbursement in principle of 80 % of the total wage cost by the Mutualité des employeurs and the three cases of 100 % reimbursement (first three months of probation, leave for family reasons, carer's leave).

The page on declaring and managing periods of incapacity for work gives the declaration to the Centre commun de la sécurité sociale within ten days of the end of the month together with the salary declaration, the form or SECUline route, the content of the declaration set out in the table above, the duty to state the exact number of hours of absence since 1 January 2020, the blocking of reimbursement where the hours claimed exceed the working hours declared, the absence of any declaration for an incapacity not exceeding two working days, the prior affiliation condition and the Centre commun's power to ask for the original of a certificate that was not sent in.

The page on incapacity for work and medical certificates gives same-day notification in no particular form, with email, fax and text message accepted, delivery of the certificate by the third day at the latest, the strict nature of that deadline and its expiry at midnight, the two parts intended for the Caisse nationale de santé and for the employer, and the possible exemption for an absence of one or two days depending on company practice.

On cns.public.lu, the page on employees' sickness benefit gives the count in calendar days including weekends and public holidays, the cap of 78 weeks over a reference period of 104 weeks, the aggregation of periods of sickness, occupational disease and accident at work, the exclusion of maternity leave and exemption from work, the floor at the minimum social wage save for a legitimate ground of exemption or reduction and the ceiling at five times that wage;

the pages on declaring an employee's incapacity and on the electronic incapacity certificate give the determination of the number of days of incapacity from the monthly declarations and the certificates, the mandatory nature of eCIT digital transmission from 1 January 2027, the refusal of non-compliant certificates from that date and the requirement of a MyGuichet.lu business eSpace with the remuneration and incapacity for work domain activated; the page on phased return to work for therapeutic reasons gives its conditions and its full counting towards the 78-week cap.

On secu.lu, the statutes of the Mutualité des employeurs give the reimbursement of remuneration, the four classes and their financial absenteeism thresholds, the way that rate is calculated against the contribution base, the annual reclassification before 1 December, the setting of rates in December by the board subject to ministerial approval and the exclusion from the calculation of incapacity arising in the first three months of probation; articles 14 and 14bis of the Social Security Code carry the cash benefit and phased return to work.

On itm.public.lu, the questions and answers on sickness and on dismissal give the deadline for informing the employer, the duration of the continued-pay period, the protection of up to twenty-six weeks running from the day the incapacity arises, the ban on notifying a termination even for serious cause, its extension to the summons to the preliminary interview, the condition that the information duties be complied with on each extension and the absence of any automatic ground for dismissal once the twenty-six weeks are over;

the decision delivered at the public hearing of 7 July 2025, published by the Inspection du travail et des mines, confirms that the protection does not extend beyond that point despite an appeal against a refusal decision of the Caisse nationale de santé. Finally, the Luxembourg government portal attributes the move from twelve to eighteen months to the law of 10 August 2018, applicable from 1 January 2019, and article L. 121-6 of the Labour Code published on Legilux carries the whole regime.

Three points could not be verified on an official source on the day of writing and are therefore not asserted here. The first is the 2026 schedule of Mutualité des employeurs contribution rates by class: the classification thresholds were cross-checked in the statutes, but the only numeric schedule encountered appears on an undated Guichet.lu page, and a law of 26 July 2023 provides for temporary reductions by class; no official communication dated 2026 could be confirmed, and the applicable rate is the one on the company's classification notice.

The second is the exact base of the five-times minimum social wage ceiling: the rule is the one published by the Caisse nationale de santé, but the amount given here is derived from the monthly unskilled minimum social wage held in our parameter registry, not read as such from a cash-benefit scale. The third is the scope of the three-day deadline for delivering the certificate: the Inspection du travail et des mines draws no distinction between Sundays and non-working days, the Caisse nationale de santé refers to a third working day, and that divergence could not be settled on the text.

A methodological reservation should be added: the domains guichet.public.lu, legilux.public.lu, cns.public.lu, secu.lu and itm.public.lu are blocked by the network proxy of our editorial environment, and these pages were read through indexed extracts using a search restricted to official domains; the citations above reproduce those extracts without extrapolation. A reader can check these points on the classification notice sent by the Centre commun de la sécurité sociale, on the cns.public.lu and guichet.public.lu pages cited, and in the consolidated Labour Code and Social Security Code on legilux.public.lu.

This article sets out the state of the law at the date of publication and does not constitute personalised legal or tax advice: the eighteen-month counter, the applicable reimbursement rate, the duration of protection against dismissal and the amount of the cash benefit depend on the employee's absence history, the nature of the incapacity, the company's contribution class and, where applicable, a more favourable collective agreement. Report an error to contact@financialservices.lu: the correction is dated in the article.