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Tax Help
each commune in Brussels organize some places open for few hours a day where tax inspectors comes and help filling the tax declaration. You can easily check in Google the location for your specific commune (for instance for WOluwe ST L is near the bookshop Cook and Book).
It is completely free, they also do it online, you get your receipt so you know if you'll payments to be made or rebates and I have been using it for years without major issues.
Bring your tax documents, the declaration you receive by post and your ID