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Updated on
April 2, 2026
What Is the eCIT? Luxembourg's CNS Electronic Sick Certificate
Learn how Luxembourg's CNS eCIT electronic sick certificate works. A complete walkthrough for employers, employees and fiduciaries.
One of your employees calls in sick. They visit their doctor, pick up a paper certificate, and hand you a copy. It works, but Luxembourg is introducing another way. Since January 2026, Luxembourg has introduced the eCIT, the electronic certificate of incapacity for work, set to gradually replace the paper-based system entirely.
What Is the eCIT?
eCIT stands for certificat d'incapacité de travail électronique, which is simply a digital sick note. When an employee sees a doctor in Luxembourg and is declared unfit for work, the doctor creates the certificate directly in their medical software. It flows automatically to the right parties. No printing, no signing, no envelope.
It covers the certificate types you'd normally encounter: sick leave, accident leave, family leave, and maternity leave. The system is now live, marking a clear shift away from paper.
The Employee Procedure
Employees need a personal space on MyGuichet.lu to receive eCIT notifications. Once a doctor issues a certificate, they can send it to the CNS either automatically (each certificate forwarded without any action needed) or manually by validating each one through MyGuichet.
Sending it to the employer works the same way: a direct electronic transmission to the employer's professional MyGuichet space. The employee gets a confirmation of transmission immediately, and a confirmation of receipt once the employer downloads the certificate. If no read confirmation arrives, the employee must send a printed version instead and not wait around. The legal obligation to notify the employer within the required deadline stays entirely with the employee. (More details below)
Stay on Schedule
For absences of two working days or less, no declaration to the CNS is required. For three days or more, the certificate must reach the CNS before the end of the third working day, with the postmark counting if sent by post.
The certificate can have a retroactive effect of up to two days. For prolongations, the new certificate must reach the CNS before the end of the second working day following the originally planned return date. Weekends and public holidays don't count.
Employers also have a separate monthly declaration obligation to the CCSS. The CNS uses both the employee's certificate and the employer's declaration together to determine who is responsible for salary payments in a given month. Both need to be correct and on time.
How does this affect Cross-Border Workers?
The Luxembourg 13-digit identification number must appear on any sick certificate, even one issued by a foreign doctor. If the doctor didn't include it, the employee can add it, but only outside sections reserved for the doctor. Any modification to those reserved sections can invalidate the certificate and trigger sanctions.
The format also varies by country of residence :
- French certificates use a two-volet structure that's accepted as-is.
- German residents should request a printed version from their doctor, since Germany's electronic certificate doesn't transfer automatically.
- Belgian residents with a single-volet certificate should ask for a duplicate for the employer.
The eCIT electronic route is only available for consultations with doctors practising in Luxembourg.
The Employer Procedure
To receive eCITs digitally, employers need a professional space on MyGuichet.lu with the "salaires et incapacités de travail" domain activated. Without it, employees simply can't send certificates electronically to you. Once active, incoming certificates appear in a dedicated portal section showing who sent what, when, and whether you've downloaded it. Downloading triggers a read confirmation back to the employee.
For paper certificates, GouvCheck lets you verify authenticity instantly via the QR code on the document, pulling data directly from the social security information system. Falsification is essentially impossible at source.
The Fiduciary Procedure
For fiduciaries managing payroll on behalf of multiple clients, the setup mirrors the employer procedure but needs to be replicated for each client. Every company you manage needs its own professional MyGuichet space with the domain activated before their employees start sending digital certificates. Since eCIT reception sits within the same CCSS environment used for remuneration declarations and affiliations, it's an extension of existing workflows rather than something new to learn.
The practical priority here is making sure clients are set up early. If an employee sends an eCIT and the employer hasn't activated their space, the certificate won't arrive, but the legal liability for late notification still sits with the employee.
What Happens If Things Go Wrong
Non-compliance has real consequences, and they fall on different parties depending on what goes wrong.
If an employee fails to submit their certificate to the CNS, they will receive a written reminder. A repeat offence can lead to a personal fine of up to 750€.
If anyone modifies sections of the certificate reserved for the doctor, the certificate is immediately voided. The fine depends on the duration involved: 200€ for absences of three days or less, 500€ for longer absences, and 750€ in case of a repeat offence.
In serious cases, the matter is referred to the State Prosecutor.
In serious cases, the matter is referred to the State Prosecutor.
Finally, certificates purchased through online platforms without a real in-person consultation are refused by the CNS entirely. When this happens, the employee receives no sickness allowance, and the employer is informed.
Just the Beginning
- Phase 1 : live since January 2026, makes the eCIT available but not yet mandatory.
- Phase 2 : planned for mid-2026, makes digital transmission the default for doctors, with paper remaining only as a limited fallback.
- Phase 3 : expected by end of 2026, extends the system to cross-border doctor consultations and the public sector.
The infrastructure is ready. The window to prepare is now.
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