The format of the Belgian registration number is Zxxx.xxx.xxx, where the first digit is a 0. However, due to the combinations running out, the numbers will soon start to be issued with ‘1’ as the first digit.
We recommend you to have your ERP set up, to be able to accept these numbers as from January 1, 2023.
Daniëlle van der Meulen-Idema
Sr. VAT Specialist