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How to use Biztax?

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Manuals

  •  Submitting a return step by step 2025 (PDF, 3.34 MB) (in French)
  •  Identifying via itsme (PDF, 356.25 KB) (in French)
  •  How to use Biztax electronic mandates (PDF, 1.33 MB) (in French)
  •  Creating the return of a company dissolved without liquidation (mergers and split-ups) (PDF, 171.48 KB) (in French)
  •  Acknowledgement of receipt: what to do when receiving the message “Validity of the document certification unknown. Impossible to identify the author” with a yellow question mark? (PDF, 381.13 KB) (in French)
  •  Compulsory configuration of your MAC when using Biztax (PDF, 345.7 KB) (in French)

FAQ

  • General information
  • Frequent error messages
  • Characteristics

Tax information

  •  Tax Shelter approved audiovisual works and Tax Shelter approved scenic works - Rates of corporate income tax and non-resident income tax as regards the companies on previously exempted profits (PDF, 97.41 KB) (in French)
  •  Income tax on legal entities assessment year 2021 - Deductible costs of a building located in Belgium (PDF, 96.58 KB) (in French)

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  • How to use Biztax?
     
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