What administrative steps must a self-employed person take after getting a Belgian professional card?

Receiving the professional card is the start, not the end, of setting up. Self-employed workers in Belgium generally have to complete business registration and, depending on the activity, register for VAT.

You also normally have to affiliate with a social-insurance fund for the self-employed, which covers your social-security obligations. Getting these registrations right keeps your activity compliant and supports any future renewal of your card, so it is worth handling them promptly after the card is issued.