- Sign in to Biztax
- Identify yourself via your identity card, via itsme® or via a class 3 certificate
- Click on “Mes déclarations”
- Enter the assessment year
- Enter the type of return IPM (income tax on legal entities) (ASBL - nonprofit association), ISoc (corporate income tax) or INR/SOC (non-resident income tax for companies)
- You must not complete any other field!
- Click on “Chercher déclarations”
- Click on "Créer une autre déclaration"
- Enter your enterprise number
- Enter the start/end date of the taxable period
- For the ASBL (nonprofit associations) the period concerned by the return is always set from January 1st to December 31st
- Enter the type of return
- Click on “Créer"
- Your return is displayed on the screen
- You can change the information sheet (only if it is necessary)
- You can enter the data of the return by clicking on 276.5.A (for the IPM - income tax on legal entities)
- To add enclosures, click on “276.5.B”
- When you have finished filling in your return, click on “Liste des erreurs”.
- Click on "Démarrer la vérification d'erreurs"
- This procedure must be carried out after each change you might bring to the return
- Click on "Souscrire"
- Cick the box "I confirm that the information provided in this declaration is accurate and true".
- Click on "Submit".
You will find here the detailed procedure