Upon departure or a few days earlier, you have to deregister yourself as a resident of Belgium.  
Exception: if you have applied for bijlage 33,  you do not have to deregister since your main address is abroad. 

Below you can find the procedure to deregister at the city of Antwerp or one of its districts.
If you are not living in Antwerp, you should contact the immigration office in your place of residence. 

 

Procedure: 
Deregistration is done directly with the Antwerp immigration desk online through Welkom | Antwerpen.be. The webpage is only available in Dutch. 

Scroll down and click on the blue button ‘Vul het formulier in’ (Fill out the form). 

 > There are several options to log in (itsme, eID and card reader, security code through mobile app or federal token).  If you choose one of these options, you will need to download the eID software or the itsme app for this to work. All your data will then be copied from the National Register and filled out automatically.  

> > However, you can also choose to fill in your data yourself without using the above options. Click on the button ‘verdergaan zonder aanmelden’ (continue without login) to do so. 

Complete the electronic form and submit it. 

After processing, a document called Model 8 proof of deregistration (only in Dutch) will be sent to your email address. This can take several weeks. 

Important:
Do not forget to deregister, otherwise you will continue to be a Belgian resident according to the Belgian authorities. Failure to deregister could have important consequences for visa requirements, taxes, health insurance registration and so on if you return to Belgium in the future.