The tax demand looks very professional. Several residents of Schaarbeek have received the letter falsely claiming to come from the City of Brussels and bizarrely requesting payment of a tax for people living in Schaarbeek. The letter includes a handy QR-code so that people can easily be duped into paying it!
The letter is written in French only and speaks of "Taxe habitation à charge des chefs de ménage", a residence tax to be paid by head of households. Such a tax does not exist.
The address listed – Post box 1444 – 1000 Brussels - is that of the Brussels Parking Service that cannot possibly charge a residence tax. The letter contains numerous spelling and interpunction mistakes and a Dutch version is lacking, which would be required in the case of a real tax.