Taxation
Published on 15 October 20265 min read
Inheritance tax return in Belgium: how it works
The Immolytics editorial team
In Belgium, the inheritance tax return is the document by which the heirs declare the assets the deceased left and settle the tax due on them. It is filed with the tax administration of the Region where the deceased had their fiscal home, and the rules differ between Flanders, Wallonia and Brussels. This page covers who files it, the papers to collect, and how a property is valued.
Who has to file an inheritance tax return
The duty falls first on the heirs and the legatees, and on the executor when a will names one. The notary handling the estate usually prepares the return and files it on their behalf.
Because inheritance tax is levied by the Regions, each authority has its own form, its own rates and its own exemptions. The same estate is therefore not computed the same way in Flanders, Wallonia and Brussels. Family relationship, the make-up of the family and the nature of the assets all weigh on the amount, as does the declared value of any property.
Before filling in anything, identify the competent Region: the one where the deceased had their fiscal home at the time of death. Those rules apply, even if a property sits elsewhere in Belgium. The rates and reliefs themselves are set out in our page on Belgian inheritance tax, and the basic vocabulary in the glossary of inheritance tax terms.
Deadlines and filing: what changes from one Region to another
The filing deadline runs from the date of death and is fixed by the competent Region. It can be extended on request, in particular where the death occurred abroad.
The file goes to the regional administration that levies the tax, in practice through the notary or another mandated person, using that Region's official form. Filing late has a cost: late interest and a fine, whose rate and calculation belong to each Region. Since these rules vary, the only reliable source remains the competent administration and the notary on the file.
Do not mix up the tax obligation with the civil steps of an estate, which follow their own timetable. Our glossary entry on property in an estate sets out the steps in order.
The documents to attach
The return comes with a file proving who the heirs are and what the estate contains. The exact list depends on the Region and on how the estate is made up, but these almost always appear:
- the death certificate;
- the act of notoriety or certificate of inheritance issued by the notary;
- the will, if one exists;
- an inventory of the assets, accounts and life insurance of the deceased;
- statements of bank balances at the date of death;
- the title deed and the cadastral extract for each property;
- loan agreements and the outstanding balance on any mortgage;
- the declaration form for the Region concerned.
Collecting these papers often takes longer than filling in the form. Keep a copy of each document and the date you sent it. Notarial costs are detailed in notary fees in Belgium, and the cadastral side in the property tax return.
How a property's value is set
A property is declared at its market value on the day of death, meaning the price a reasonable buyer would have paid on that date. An asking price on a listing, the cadastral value and a municipal average are all insufficient on their own.
To get close to that value, the usual method is dated comparable sales in the same commune or neighbourhood, adjusted for differences in floor area, condition, energy performance and land. Statbel publishes official figures on sale prices, and the notaries publish their own barometers. These data are a benchmark for reading a market, not proof for one particular property.
That is where the price map and the property prices pages per commune help: they give a local order of magnitude before you sit down with the administration. For a file that has to hold up before the tax office, a reasoned property valuation is stronger than a screenshot of an advert. And if the question is what the property is worth today, the estimate for the commune gives an up-to-date benchmark.
When the estate is mostly one property
When an estate holds mainly a house and little cash, paying the tax becomes the real problem for the heirs, far more than the calculation itself.
The Regions provide arrangements for these situations, but the conditions, the interest and the duration are not the same everywhere. Some allow the payment to be spread out; others accept payment in kind, for instance handing over an asset in settlement of the tax. There is no single solution: the request goes to the regional administration, with a file that justifies the situation. Taking advice from the notary before the estate is settled avoids improvising a payment plan under pressure.
The second reflex is to put a figure on things early. A property sale takes months, while the filing deadline is fixed. A recent valuation shows whether the sale will cover the tax, and avoids selling cheap to meet a tax timetable. The pages price evolution, market trends and barometer show how the local market has moved, commune by commune, over several years.
If one heir keeps the property and buys out the others, the financing question comes quickly. Our page on mortgage rates gives information on the types of loan and the costs involved; it offers neither a bank nor a broker. Either way, better to plan ahead: the tax office has a fixed calendar, the property market does not.
Frequently asked questions
Who signs the inheritance tax return?
The heirs and the legatees sign it, or the person they mandate to represent them, most often the notary in charge of the estate. A single heir may sign for the others when there is a written mandate.
Can an inherited property be sold before the tax is paid?
The sale can go ahead before the tax is paid, but it does not remove the duty to file the return. The tax office must still be able to identify the property and know its value on the day of death, even if it has changed hands in the meantime.
What happens if the return is incomplete or wrong?
An incomplete or incorrect return can be put right after filing, through a corrective return to the same administration. Report the mistake as soon as you spot it and keep proof of the correction, because the interest calculation depends on the date the tax office is told.
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