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Are you married or legal cohabitant but your tax return doesn’t include your partner?

If you are married or in a legal cohabitation, you must introduce a joint tax return with your partner.

In some cases, it is possible that your partner isn’t (wrongly) mentioned in your tax return.

If you are in this situation, you must take the steps mentioned below (even if you were able to file a joint declaration last year).

Regularise your situation

  • You are residing in Belgium

    You must report your status as married person (or as legal cohabitant) to your commune of residence.

  • You are residing abroad and you are a Belgian citizen

    You must report your status as married person (or as legal cohabitant) to the Belgian consulate or embassy of the country you’re residing in.

  • You do not reside in Belgium and you are not a Belgian citizen

    Mail a marriage certificate or certificate of legal cohabitation.

    SPF Finances - Centre P Bruxelles INR - Gestion
    Avenue Prince de Liège 133 bte 516
    5100 Jambes

    This document must be written in French, Dutch, German or English. If that’s not the case, have it translated by a sworn translator.

    You (and/or your partner) have a have a Belgian "national registration number" or a Belgian "bis number"? Mention it on the document. You will find this number on your Belgian identity document (identity card, residence permit,…) or on your Belgian income sheets (in some cases).

    We will then adapt your file.

Fill out your tax return on paper

  • Mention your partner's contact information on the paper tax return.

    First and last name

    National number or bis number

    Does your partner have a Belgian "national registration number" or a Belgian "bis number"? If yes, mention it under "Numéro national partenaire (NN)". You will find this number on your Belgian identity document (identity card, residence permit,…) or on your Belgian income sheets (in some cases).

    Numéro national partenaire

    If your partner doesn’t have a Belgian national registration number or a Belgian bis number, leave the field empty.

    Complete the rest of your tax return and sign it.

    • Mention all the codes and value concerning your partner in the second column of the tax return.
    • Both of you must sign the tax return.

  • Can I file my return via MyMinfin (Tax-on-web)?

    It is not possible to file your return via MyMinfin (Tax-on-web). 

    Have you saved or already sent your tax return in MyMinfin (Tax-on-web)? Send a paper tax return anyway. We will only take into account your paper tax return.