I had a bathroom, a veranda or an extra room built in my home; do I have to report this to the tax authorities?
In short
Yes. You must report renovations that increase the value of your home to the land registry within 30 days after the work is finished. If you do not, there is a fine of 1.000 €, 2.000 € or 3.000 €.
Video transcript
You had a new veranda built onto your home. The work is finished. Required: Renovations that raise the value of the home must be reported to the cadastre within 30 days of completion. The right way: If no letter comes from the tax office, report it yourself: via MyMinfin or by post. A building permit does not replace this report. If you don't report: Fine: 1.000, 2.000 or 3.000 €; Also: Back property tax; Deliberate tax fraud: Criminal case possible.
What is not allowed, what is required?
- Works that can change the cadastral income, such as an extension, a veranda, a garden house, a swimming pool, a new bathroom or central heating, must be reported to the tax authorities (FOD Financiën / SPF Finances, land registry) within 30 days after the works are finished.
- This report affects the cadastral income (kadastraal inkomen / revenu cadastral) on which property tax is calculated.
- In many cases the tax authorities send you a letter or a MyMinfin message asking you to declare. If you do not get a letter, you must declare on your own initiative; a permit from the municipality does not replace this declaration.
- For works that do not need a permit, you must make the report yourself (via MyMinfin or by post).
Penalty and indirect consequences
- Fine / payment
- Not reporting (since October 2023): 1.000 €, 2.000 € or 3.000 €, depending on the new cadastral income
Legal basis:KB 20.9.2023 (uitv. art. 445 §5 WIB 92), art. 1, rubriek B (Justel)
- Court / prison
- Usually an administrative fine is imposed. If there is an intention to evade tax, the criminal court can also get involved.
Legal basis:vlaanderen.be – Het kadastraal inkomen
What really matters: the indirect consequences
- You may have to pay the difference in property tax for past years
Legal basis:Vlaamse Codex Fiscaliteit 13.12.2013, art. 3.3.3.0.1-3.3.3.0.2
- Works done without a permit can come to light through the land registry report
- When you sell or the property is inherited, differences between the records and the real situation cause problems
Why does this rule exist?
Property tax is based on the value of the home. When everyone reports their renovations, the tax burden is shared fairly.
Where can you go?
- Municipal planning departmentAsk before you start the works (dienst omgeving / service urbanisme)
- Tax office – land register (cadastre)Report renovation works through MyMinfin
- Social interpreterAt the municipality, the OCMW/CPAS, school and hospital, you can ask for an interpreter in your language; it is often free.
This site does not handle individual cases; it points you to the right service. All help addresses
Source and reliability
Official source- Source check
- 9 / 9 statements in an official source
- Checked: 12.10.2026
- Last checked
- 12.10.2026
- Rules can change
Show the 9 checked statementsopen
- Found in an official source
İşin bitiminden itibaren 30 gün içinde kadastroya bildirim
Vlaanderen.be, Het kadastraal inkomen - Found in an official source
1.000 / 2.000 / 3.000 € (yeni KI'ye göre), Ekim 2023'ten beri
KB 20.9.2023 (uitv. art. 445 §5 WIB 92), art. 1, rubriek B (Justel) - Found in an official source
Bildirim kadastro gelirini etkiler
Vlaanderen.be - Found in an official source
MyMinfin üzerinden bildirim
FOD Financiën persbericht 11.07.2024 (news.belgium.be) + fin.belgium.be 'Een kadasteraangifte met de post opsturen' - Found in an official source
Tadilat, işler bittikten sonra 30 gün içinde bildirilir
FOD Financiën – Aangifte van wijzigingen (kadastraal inkomen) - Found in an official source
Çoğu durumda mektup gelir; gelmezse kendiliğinden bildirim
FOD Financiën – Aangifte van wijzigingen (kadastraal inkomen) - Found in an official source
Bitiminden itibaren 30 gün içinde bildirim
FOD Financiën – Aangifte van wijzigingen (kadastraal inkomen) - Corrected according to the source
Bildirmemek idari, hatta cezai para cezası doğurabilir
vlaanderen.be – Het kadastraal inkomen - Found in an official source
Geriye dönük emlak vergisi (onroerende voorheffing) farkı istenebilir
Vlaamse Codex Fiscaliteit 13.12.2013, art. 3.3.3.0.1-3.3.3.0.2
The checked statements are in Turkish, as in the source text. This check does not replace legal advice.
General information, not legal advice. For your own situation, ask a lawyer or free legal aid. How was this information prepared?