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Dears you might recieve a brown cover post stating tax file for you that you can submit via online or filled hard copy in IT office in Brussels
Address Boulevard du Jardin Botanique 50, 1000 Bruxelles (Inside botanique metro)
More info https://www.thebulletin.be/understanding-paper-belgian-income-tax-return
More info https://finance.belgium.be/en/about_fps/structure_and_services/general_administrations/taxation
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