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BIZTAX is the web service of the Belgian Government to administer the Tax declarations for VZW, and other organisations or enterprises.

Login with eID[edit]

Go to


  • You need to login with your Belgian e-ID, and select "In the name of a company"
  • Then select: "Indienen voor uw onderneming"


  • So you need to have the Belgian nationality
  • Do not login as a person, nor as a mandatory

If you select the wrong option, you get an error like:

U bent aangemeld als mandataris maar voor dit ondernemingsnummer bent u wettelijke vertegenwoordiger.
Druk op de knop 'Afmelden' en gelieve u opnieuw aan te melden als wettelijke vertegenwoordiger.

Start or review a Tax declaration[edit]

  • Goto "Mijn aangiften"
  • Fill in the Enterprise number: 0563.775.480
  • Enter the year of declaration (+1 of income year)
  • Select type of enterprise: RPB (rechtspersonen)
  • Click on "Search"

Then you get the option to create, review, or administer your declaration.

Open/create the year for which you would like to provide/access the documents.

It is possible that the administration already created a template declaration.

Tip: you better wait till July to administer your declaration; often the tax administration is not yet ready to allow entering your declaration (physical persons having priority - personenbelasting).


  • Login; then click the left menu options, in sequence:
    1. Input: Header sections; check, complete, and update the required sections:
      1. Review/update Name, address, bank account, contact list: Section Id (identification)
        • Responsible person and contact details
      2. Add taxable items: Section 276.5.A (income)
        • Normally empty (unless you have something to declare)
      3. Upload attachments: Section 276.5.B (jaarrekening)
        • Jaarrekening: yearly income/expense and balance sheet (for small VZW)
        • Other important document(s)
      4. 274 APT-8 (SME with personnel)
    2. Save the declaration
    3. Check for errors (Error list)
    4. (Simulate) calculate the (estimated) tax amount (important as a completeness verification!)
    5. Sign the document
    6. Download the resulting documents
  • Logoff
  • Archive the electronic documents

List of mandatory attachments[edit]

Data entry timing[edit]

Before end of July for the preceding year of income. Period can possibly be extended by the administration.

Taxable year < Bank transactions < Balance sheet < Income and expenses < Financial statements < General Assembly < Legal updates < Registration of Financial statements < Tax declaration < Tax calculation < Tax payment

Resulting documents[edit]

It is critical to archive those document on G-Suite for later reference and proof.

Tax declaration documents
Document (example) Description
Jaarrekening.pdf Balance sheet and income/expense declaration
Ontvangstbewijs_21/09/2016.pdf Receipt
Bewijs_van_ondertekening_21/09/2016.pdf Proof of signature
XBRL_van_de_aangifte_21/09/2016.xbrl Binary XML version of the tax declaration (internal use for Tax services)
PDF_van_de_aangifte_21/09/2016.pdf Declaration (Human readable)


Caveat: For late declarations you get a default penalty of (at least) 50 €. As a consequence the proof of tax disputes falls back to the enterprise.

External links[edit]

See also[edit]