Register as an employer in Belgium

Anyone wishing to employ staff in Belgium must register as an employer with the National Social Security Office (NSSO). This takes place via the online service 'Wide' (in French) on the Belgian social security portal. After registration, the employer is issued with an identification number: the NSSO number.

There is a non-secure and a secure version of 'Wide'. If you do not have a Belgian social security portal account yet, please identify yourself as an employer in the non-secure version.

What do you need to identify yourself as an employer?

Nothing! The non-secure version of 'Wide' asks what type of staff you want to employ and whether you are a natural or legal person. You enter your company number, if you have one, but you can even identify yourself as an employer without it.

When the NSSO has processed your application, you will be sent a letter with your NSSO number.

'Wide' secure online service

Once you have your NSSO number, you can register on the Belgian social security portal (in French) and use the 'Wide' secure online service. You use the secure version of 'Wide':

  • to submit a request to change your details as an employer; and
  • to ask to be removed from the register of Belgian employers.

You are required to tell us if:

  • you are no longer employing staff, whether temporarily or permanently; or
  • the circumstances of your organisation change, for example if you embark on a new activity.

Your registration on the social security portal (in French) gives you access to all secure online services on that portal. You will need these services to fulfil your obligations as an employer. One of the secure services is 'Mahis (in French)', which you use to appoint a representative for your administration.

When you register, your company will also automatically receive an e-Box (in French). This is a digital mailbox in which you will receive messages and documents from the social security institutions.