Disputing property tax in Belgium
How to dispute property tax? Procedure, deadlines, objection and appeal.
Valid grounds for disputing property tax
Disputing property tax is not a common reflex, yet several situations justify it:
| Ground | Concrete situation | Frequency |
|---|---|---|
| Calculation error | Amount differs from expected calculation | Rare |
| Incorrect cadastral income | CI revised upward after minor works | Frequent |
| Unproductive property | Involuntarily vacant > 180 days | Frequent |
| Uninhabitable property | After damage (fire, flood) | Occasional |
| Reduction not applied | Dependants, disabled person | Frequent |
| Double taxation | Same property taxed twice (admin error) | Rare |
The most common ground for landlords is the unproductive property: a dwelling empty between tenants for over 180 days entitles to a proportional property tax reduction.
The second frequent ground is cadastral income revision after works. The Cadastre Administration can increase the CI following a planning permit, even for minor works (like-for-like replacement). This increase is disputable.
Dispute procedure
The dispute deadline is 6 months from the date of the tax assessment notice. The dispute must be sent by registered letter to the regional FPS Finance director (Brussels/Wallonia) or to VLABEL (Flanders).
The dispute must include: your identity, the assessment reference number, the grounds for dispute and supporting evidence (vacancy proof, CI calculation, works documentation).
Payment is not suspended during the dispute. You must pay the contested amount. If the decision is favourable, the overpayment is refunded with interest.
Court appeal
If the administrative dispute is rejected, you can appeal to the tax court (Tribunal de premiere instance) within 6 months of the rejection decision. Legal representation is recommended at this stage.
Court costs can be recovered if the appeal succeeds. For unproductive property claims, success rates are generally high when documentation is solid.
Practical tips for landlords
- Keep proof of marketing (listings, agency mandates, viewing records) to justify vacancy in case of an unproductive property claim
- Monitor CI revisions after any works requiring a planning permit
- Check calculations by applying the formula yourself: CI x indexation coefficient x 1.25 % x (1 + surcharges)
- File on time: the 6-month deadline is strict and cannot be extended
A rental management software archives your property tax notices, vacancy periods and marketing proof for each property.