Belgian property tax calculation: who sets each layer

Belgian property tax, known in French as précompte immobilier and in Dutch as onroerende voorheffing, is calculated in three multiplications: the non-indexed cadastral income times the year's coefficient (2.3 in 2026), times the regional rate, times a multiplier formed by the surcharges of the province and the municipality. Four levels of government are involved, and the last of them, the municipality, almost always weighs the most.

How do you calculate property tax in five steps?

The method is the same in all three Regions. Only the base rate and the number of surcharge points change.

1. Find the non-indexed cadastral income. Cadastral income is a notional annual rent assigned to every property by the federal tax administration. It appears on MyMinfin, in the purchase deed or on last year's bill. Take 1,000 euros.
2. Multiply it by the indexation coefficient. In 2026 it is 2.3, so the indexed cadastral income is 2,300 euros.
3. Apply the regional rate. 1.25% in Wallonia and Brussels, or 28.75 euros; 3.97% in Flanders, or 91.31 euros. This amount is called the base, or principal.
4. Add the surcharges. A hundred surcharge points (centimes additionnels, opcentiemen) equal the base once over. A municipality levying 2,600 points therefore adds twenty-six times the base, and the province does the same with its own. SPW Finances sums the formula up as an overall rate: 1.25% plus the provincial rate plus the municipal rate.
5. Deduct any reductions. Modest home, children, disability, regional or municipal premium: they come off at the end of the calculation.

Brussels no longer has a province, but the agglomeration levies 989 points. Brussels Fiscality publishes the example of Anderlecht, with 3,850 municipal points: the overall rate there reaches 61.7375% of indexed cadastral income.

Who sets what: a regional tax with four layers

Property tax is one of the regional taxes listed in Article 3 of the Special Financing Act of 16 January 1989, the law that sets how Belgium's Communities and Regions are funded. The base, however, remains federal.

The money flows the other way round: the level that sets the base collects the least. In Wallonia, of 1.8 billion euros collected in 2022, 59% went to municipalities and 38.5% to provinces, according to SPW Finances. That leaves the Region a share of about 2.5%. The division of powers between these levels is explained in our article on Regions and Communities.

Cadastral income and property tax: why a 1975 base?

Cadastral income is a notional rent. It estimates what the property would earn in a year if it were let, at the market conditions of 1 January 1975 for most properties, as Brussels Fiscality puts it. It has been indexed every year since the early 1990s; the coefficient rose from 2.2446 in 2025 to 2.3 in 2026.

That is +2.47%.

This increase applies everywhere, without any council voting on it. Of Wallonia's 262 municipalities, 235 changed nothing in their surcharges in 2026 and show exactly that rise, L'Avenir calculated on 7 August 2026.

How much is due on the same property in Lasne, Ath, Anderlecht or Antwerp?

Between 833.75 and 1,493.56 euros, for an identical non-indexed cadastral income of 1,000 euros, with no reduction, in 2026.

For Antwerp, the calculation starts from the Flemish base of 91.31 euros, to which are added the city's 850 points, unchanged since 2018, and the 160 points voted by the Antwerp provincial council on 5 December 2025: 91.31 euros times 11.10 gives 1,013.54 euros. For Saint-Josse-ten-Noode, the 4,090 points of 2026, against 2,980 the previous year, come from the report by the consultancy Ayming reported by VRT NWS on 27 May 2026.

The gap between Ath and Lasne, 659.81 euros, is wider than the average gap between Regions. The same report puts the average burden at 47.22% of cadastral income in Flanders, 55.22% in Wallonia and 58.48% in Brussels: the municipality matters more than the Region, and Wallonia alone contains both the lowest and the highest rate in this table. These gaps describe local tax choices; they say nothing about the quality of a municipality's management.

Three administrations collect property tax

Flanders took over the service in 1999, Brussels on 1 January 2018, and by February 2019 the FPS Finance was providing it only for Wallonia, according to a ministerial answer to the Senate. SPW Finances has since taken over and now sends the Walloon bills itself. In Flanders, the Vlaamse Belastingdienst sends bills from May; in Wallonia, they arrive in the second half of the year.

What property tax reductions exist?

Each Region has its own rules, and conditions that share a name are not read the same way. All are assessed on 1 January of the tax year.

• Modest home: a 25% reduction if the non-indexed cadastral income does not exceed 745 euros. Wallonia adds up all properties located in Belgium, Flanders those in the Flemish Region, and Brussels requires the property to be the only one held in the Region.
• Children: from two children living in the property, in all three Regions, with an amount or percentage specific to each; in Brussels, 10% per child entitled to child benefit.
• Disability and severely disabled war invalids: a reduction linked to the person living in the property, 20% per person in Brussels.
• BE HOME premium in Brussels: 164 euros in 2026 when an owner lives in the property, and some Brussels municipalities add their own premium, 150 euros in Anderlecht.
• Social letting: the rate drops to 0% for a property let through a social letting agency in Brussels, and in Wallonia for a private individual who entrusts their property to such an agency.
• Energy performance in Flanders: an automatic reduction for new builds and major renovations, based on the E-level on the energy performance certificate.

For an owner-occupier in Anderlecht, the regional and municipal premiums therefore bring 1,419.96 euros down to 1,105.96 euros.

Does the tenant have to pay property tax?

No. SPW Finances says so plainly: the tenant is not liable, and any clause to the contrary is unlawful. Tenants can, however, apply for certain reductions linked to their family situation; these are granted to the landlord, who must deduct the amount from the rent. Brussels and Flanders apply the same mechanism.

Who can change the bill, and when?

The municipal council, every year, through a simple tax regulation. In 2026, 88 Belgian municipalities raised their surcharges, against 6 in 2025, 56 of them in Flanders, according to the Ayming report cited above; Wavre, with a 20.65% rise for our standard property, is the sharpest Walloon example in L'Avenir's calculations. Regional parliaments decide on the base rate and the reductions, while any general revision of cadastral incomes, which still rest on 1975, would be a federal matter.

Property taxation is one of the themes on which party manifestos differ, as our article on registration duties shows. Our taxation comparison and the comparator set out those positions without ranking them, and the methodology recalls that the published scores describe a position on an axis, never a quality.

Sources: SPW Finances, property tax page (calculation, reductions, 2022 redistribution) and FAQ on the calculation; Brussels-Capital Region, property tax (rates, agglomeration surcharges, Anderlecht example, 2026 coefficient, reductions, BE HOME premium); Vlaanderen.be, property tax; City of Antwerp, municipal surcharges; Province of Antwerp, 2026 provincial surcharges; Special Act of 16 January 1989 on the financing of the Communities and Regions, Article 3; Belgian Senate, written question 6-2310, answer of 12 February 2019; L'Avenir, 2026 property tax municipality by municipality, 7 August 2026; VRT NWS, Ayming report on surcharges, 27 May 2026. The Antwerp, Anderlecht and Saint-Josse-ten-Noode amounts were recalculated from the official rates, for a non-indexed cadastral income of 1,000 euros and with no reduction.