Search form

menu menu
  • Daily & Weekly newsletters
  • Buy & download The Bulletin
  • Comment on our articles

Checklist: What documents do you need to fill in a Belgian income tax return?

00:44 01/06/2023

Hopefully, you have put all the documents you received in one envelope or box: your salary or pension statement for 2022, certificates of donations to charities etc.

So, which documents and certificates do you need to prepare your income tax return?


  • salary statement;
  • holiday pay statement (if not paid by your employer);
  • unemployment benefit statement;
  • illness or occupational injury benefit statement;
  • pension statement;
  • all documents evidencing tax deductible expenses relating to your job;
  • for self-employed: certificates confirming social security paid, private pension (VAPZ/PLCI) contributions, reimbursement of professional loans;
  • your personal contribution to the mutuelle/ziekenfonds;
  • if you have real property, the annual bill(s) for the property tax (précompte immobilier/onroerende voorheffing);
  • if you have an overseas property, the letter of the tax authorities determining the cadastral revenue;
  • if your tenant is a company or a professional: a summary of the rent received and the identity of the tenant(s);
  • if you have taken out a new mortgage: the certificate delivered by the bank with details of the mortgage;
  • mortgage payment certificate(s);
  • mortgage insurance premium certificate;

If you have income from savings and investments:

  • bank statements showing interest and dividends received;

Certificates justifying deductible expenses:

  • premium(s) paid for ordinary life insurance by way of long-term saving;
  • contributions paid for pension saving;
  • titres-service /dienstencheques;
  • payments for childcare;
  • premiums for legal expenses insurance ;
  • personal contribution to public transport season ticket;
  • tax-deductible gifts;

Other documents:

  • proof of maintenance paid (+ identity of the beneficiary);
  • summary of maintenance received (+ identity of the payer);
  • certificates relating to energy saving expenses and expenses (with invoices and proof of payment);
  • certificate of co-parenting arrangement;
  • advance tax payments;
  • self-employed : income, social security paid in 2021 and list of expenses.

Other useful information:

  • changes in the family situation (marriage, divorce…);
  • name and date of birth of dependent children;
  • identity of other dependents;

It is also a good idea to start with last year’s tax bill to see which codes you used then.

More from our 2023 income tax guide

  1. When do I need to file my Belgian income tax return?
  2. Online or on paper?
  3. Filing online
  4. Understanding the paper tax return
  5. Checklist: What documents do you need?
  6. The return in detail
  7. Belgian income tax: There's nowhere to hide
  8. A guide to cross-border taxation
  9. Belgian income tax returns for families
  10. Help! Where to get assistance with your tax return
  11. Understanding your Belgian income tax bill
  12. How do I appeal?
  • This guide was written by Marc Quaghebeur, an international tax lawyer at Cabinet DAVID. It is a general introduction based on current understanding of the law. It is not to be taken as a suitable alternative for individual advice. If you have a question, you can contact him by clicking on his name.
Written by Marc Quaghebeur