Your cadastral income, and what it triggers
Cadastral income represents the net annual rent your property would have produced on 1 January 1975. That fifty-year-old figure now governs your property tax, your tax return, and — if you let the property — your taxable base. Here is what it comes to on your property.
Your property
The use
Property tax
Enter a cadastral income to see the calculation.
📐 What your figure comes to
The detail
🏢 The professional tenant regime
Here the rent counts, net of a 40% flat expense deduction — but that deduction is capped at two-thirds of the revalorised cadastral income. It is the cap most often forgotten, and it changes the base considerably.
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The method, and its limits
What is sourced
The two indexation coefficients of cadastral income, the 1.40 uplift for a let to a private tenant, the 40% flat expense deduction and its cap of two-thirds of the revalorised figure, the revalorisation coefficient, and the base property tax rates of the three regions all come from the FPS Finance and the regional administrations. They live in a single scales file, shared with the rest of the site.
What we do not put a figure on
Provincial and municipal surcharges, which multiply the base tax by five to ten. They vary by municipality, we have not worked them through, and publishing an average would give a figure unrelated to your own tax notice. So the field is yours: the multiplier is on that document, next to the base amount. Nor do we model the reductions — dependent children, disability, unproductive property — which are applied for and sometimes granted automatically.
An extension, a converted attic, an extra bathroom or a garage turned into living space must be declared to the Measurements and Valuations Administration within 30 days of occupation. An upward revision raises the property tax for every following year, and failing to declare can bring a retroactive adjustment.
The figure itself can be contested, but with the FPS Finance and not your region — and the deadline runs from its notification. Our page on property tax sets out the two appeals, which are often confused.