Declaring a new construction or modification to my immovable property

If you occupy a new construction or have your immovable property modified, you must declare it. Based on this, we will determine the cadastral income for your immovable property. Find out how to make the declaration.
  • Submitting your declaration

    You can easily submit your declaration online via MyMinfin.be. This is the fastest way. You can also report through the declaration that the activities have not yet been completed or that your project has been stopped.

    1. Sign in to MyMinfin.
    2. In the box on the welcome page you can click on ‘Mijn woning en mijn onroerende goederen’ (‘My home and my immovable property’) under ‘Mijn onroerende gegevens raadplegen’ (‘Consult my immovable property data’).
    3. Under ‘Mijn huidige onroerende goederen’ (‘Consult my immovable property data’), click on ‘Een wijziging aangeven’ (‘Declare a modification’).
      There are two options:
      • The first option is a non-spontaneous declaration. You use that option if you have received correspondence for that property, such as a letter or a message in MyMinfin asking you to make a declaration.
      • The second option is a spontaneous declaration. You use this option if you have not received any correspondence, but want to make a spontaneous declaration.

    Unable to submit your declaration online via MyMinfin? You can also send a paper declaration form by post.

    If the modification results in a new cadastral income, you will receive a service notice. This is the official notice through which we inform you of your new cadastral income.

    What modifications?

    You must declare any modification that may affect the cadastral income.

    Please note that for most modifications to immovable property, you must first apply for a construction permit, or notification is required, which you must settle with the municipality. The declaration obligation to the FPS Finance involves the declaration of the completed activities.

    You must declare the modification within 30 days after the end of the activities, which means the end of structural adjustments and not the finishing works, such as painting or wallpapering.

    In many cases, you will receive a letter to submit the declaration. You did not receive a letter? Then you must make a spontaneous declaration. In case of non-declaration, you risk an administrative and even criminal fine.

    Buildings

    The declaration obligation applies to both houses and non-residential buildings:

    • the first occupation or rental of a new construction
    • a partial or full demolition of a building
    • a renovation

    By renovation, we mean structural adjustments to the building or modifications to the features or comfort elements of the immovable property, for example:

    • You have enlarged a building, split from or merged it with another building.
    • You have bought an old house without central heating that you are providing with a heat pump system.
    • You have bought an old house that only had a sink and you install a bathtub or shower.
    • You have built a summer-house or veranda.
    • You have built a swimming pool or swimming pond.

    Ground

    You must submit a declaration if you have changed the exploitation of the ground or if you have transformed (e.g. planted trees) or improved it.

    • I am no longer an owner. What should I do?

      Return the declaration form along with a proof of sale to the department listed on the form.

    • I do not have an EPC (Energy Performance Certificate) yet. What should I do?

      If you do not have an EPC, mention ‘Not yet known’ in the box.

    • I do not know de cost of the renovation. What should I do?

      This is the total of invoices without VAT.

      You do not need to include the following: land value, study costs (e.g. architect, EPB, EPC), works around the house and landscaping, beautification works (e.g. painting and wallpapering, furniture, window decoration) or connection costs for utilities.

      If you cannot calculate the cost, mention ‘Not yet known’ in the box.

    • I do not know what to fill in under ‘Habitable roof floor’. What should I do?

      By habitable roof floor, we mean a room under a gable roof under which there are rooms that can be or could be considered habitable. These are finished rooms with, for example, light openings or heating (in any form).

      If a roof floor is partly habitable and partly set up as an attic, you can mention this on the declaration. You can also attach a copy of the building plan if necessary.

    • (Part of) my immovable property has been destroyed after a disaster. How should I declare this?

      If you have suffered damage to your immovable property after a disaster that causes a definite reduction in value, you will also need to submit a declaration to have the cadastral income revalued.

      You use the ‘demolition works’ option for this purpose.

      In this case, you can also contact the Region in which your immovable property is located to request a reduction in property tax.