Show your passport at the customs office before your departure if you are leaving from one of the below locations.
The customs officer on duty will validate your electronic tax-free forms from their terminal (self-service kiosks are not yet in service in Belgium).
Antwerp International Airport (ANR)
Brussels (Zaventem) Airport (BRU)
Brussels South Charleroi Airport (Gosselies) (CRL)
Flanders International Airport (Kortrijk-Wevelgem) (KJK)
Internationale Luchthaven Oostende-Brugge (OST)
Liege-Bierset Airport (LGG)