In most cases, you need to have a notarial deed executed. The costs of incorporation mainly include publication costs in the Belgian Official Gazette and the notary's fees. For more information, you can visit the website of the Royal Federation of Belgian Notaries.
For all other formalities, you can contact an enterprise counter. You can find a complete list of enterprise counters on the website of the Federal Public Service Economy, SMEs, Self-Employed and Energy.
On the website of 1819.brussels you can find all the information you need to start, take over, transform or wind down a business. It is your guide to every stage in the life cycle of your business.