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Property tax calculator

Free and without an account. Your browser does the calculation: the cadastral income you enter is not sent to our server.

The 2026 property tax (onroerende voorheffing) is the cadastral income (KI) times the indexation coefficient 2.3000, times the region’s base rate (3.97% in Flanders, 1.25% in Brussels and Wallonia), times 1 plus the surcharges of the municipality and province (in Brussels, the agglomeration) divided by a hundred. Choose your municipality: the calculator fills in the surcharges and works it out with your KI.

Calculate

Indexation coefficient of the cadastral income for tax year 2026: 2.3000 (Income Tax Code 1992, art. 518).

Flanders

Property tax per yearCadastral income × 2.3000 (indexation 2026) × 3.97% × (1 + surcharges / 100), without reductions (modest home, children); whoever owns the property on 1 January pays for the whole year.–

The amounts appear here with JavaScript; without scripts, the rates are listed below.

The rates
WhatRate
Property tax3.97% of the indexed cadastral income, plus the surcharges

Brussels

Property tax per yearCadastral income × 2.3000 (indexation 2026) × 1.25% × (1 + surcharges / 100), without reductions (modest home, children); whoever owns the property on 1 January pays for the whole year.–

The amounts appear here with JavaScript; without scripts, the rates are listed below.

The rates
WhatRate
Property tax1.25% of the indexed cadastral income, plus the surcharges

Wallonia

Property tax per yearCadastral income × 2.3000 (indexation 2026) × 1.25% × (1 + surcharges / 100), without reductions (modest home, children); whoever owns the property on 1 January pays for the whole year.–

The amounts appear here with JavaScript; without scripts, the rates are listed below.

The rates
WhatRate
Property tax1.25% of the indexed cadastral income, plus the surcharges

Legal source: Flemish Tax Code, Income Tax Code 1992 art. 518 and the 2026 surcharges of the Flemish Tax Authority and Brussels Taxation (checked on 26 October 2026)

An indication based on the statutory rates, without reductions and not advice: the region’s tax authority sets the amount on your assessment.

How the calculator works

The cadastral income is a notional net rental value set by the Land Registry. The calculator multiplies it by the year’s indexation coefficient and the region’s base rate, then adds the surcharges: 1,000 surcharge points make the base amount eleven times larger.

The surcharges come from the lists of the Flemish Tax Authority and Brussels Taxation, with those of the province or the agglomeration added. A few municipalities have more than one rate; the calculator then fills in the lowest and says so.

The calculator does not include reductions. Each region has them, among others for a modest home, for dependent children and for a person with a disability; the conditions are set out by the region’s tax authority (see the sources).

It is the same calculation as in section 16 of the report, Purchase costs, where the surcharges of the address’s municipality are already filled in.

Questions

Is this calculator free?

Yes. You don’t need an account and your browser does the calculation: we neither receive nor store the cadastral income.

Where do I find the cadastral income?

On the property tax assessment and in MyMinfin, with the details of your cadastral parcels. Enter the cadastral income as shown there, not indexed: the calculator indexes it itself.

Why doesn’t the calculator include any reduction?

Because they depend on your household and your other property. Each region has reductions, among others for a modest home, for dependent children and for a person with a disability; the region’s tax authority applies them.

Why do I have to enter the surcharges myself in Wallonia?

We found no open list of the surcharges for the Walloon municipalities. They are on your tax assessment and in the municipality’s tax regulation.

Sources

Further reading

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