The registration of the lease and its annexes is done with the Federal Public Service of Finance in Belgium. Registration can be done in two ways:
Either by going physically to one of the competent offices of the federal service, the list of which you will find on the Myminfin site;
Either by Internet without moving by going to the MyRent online application. The process is quite simple, you are asked to provide the documents to be saved in pdf file format.