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How do I get an employer registration number in Luxembourg?

Getting an employer registration number (matricule employeur) is essential before hiring your first employee in Luxembourg. This number is assigned by the Joint Social Security Centre (CCSS) and is required for all payroll and social security processes.

Steps to register as an employer

Follow these steps to obtain your employer registration number:

Check if you need a business permit

If your business activity is regulated, apply for a business permit (autorisation d'établissement) from the Ministry of the Economy first
Complete this step before proceeding with employer registration

Access the operating declaration

Log in to your Salary.lu account
Go to the "Documents" page
Find the operating declaration form

Complete the operating declarationFor detailed instructions on completing the form, see: How do I create an operating declaration on Salary.lu?

Fill out the form with your business details:

For individuals: full name, address, phone number, and national identification number
For companies: company name, registration number (RCS), registered office address, date of incorporation, phone number, and business activity description

Attach any required supporting documents (e.g., proof of registration in the trade register if not already filed in Luxembourg)

Submit the declaration

Send the completed operating declaration to the CCSS via email at ccss@secu.lu
Submit before hiring your first employee or within 8 days of the employee's start date

What happens after registration

Automatic affiliations

Once registered, you are automatically affiliated with:

Accident Insurance Association (AAA)
Employers' Mutual Insurance (MDE)
Multi-sector Occupational Health Service (STM), unless you provide proof of alternative coverage within three months

Confirmation and employer number

The CCSS will send you a confirmation letter containing your employer registration number (matricule employeur). You will use this number for all future social security and payroll obligations.

Important: Registering as an employer is a legal requirement before hiring staff in Luxembourg. Make sure to keep your employer registration number safe, as it will be needed for all payroll and social security tasks.

Key points to remember

The employer registration number remains valid as long as your business exists, unless you change its legal form
Report any changes to your business name, address, or contact details to the CCSS
Changes do not require a new registration number unless the legal form changes
The operating declaration for employer registration is separate from the declaration of employment required for each new hire

Updated on: 24/06/2025

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