Who is behind MeerwaardeTool
MeerwaardeTool is a Belgian calculator for the capital gains tax. Here you can read who builds it, what the calculation rests on and what happens to your data.
Who we are
MeerwaardeTool is an initiative of ID Holding, a Belgian software company specialising in fintech applications.
ID Holding is based in Wijnegem and registered in the Crossroads Bank for Enterprises (KBO) under number BE0690.712.650.
Why this tool
Since 1 January 2026, Belgium taxes the capital gains you realise on financial assets. A Belgian broker can withhold the tax for you, but if you invest through a foreign broker you have to keep track yourself of what you sell, at what purchase price, and how much of the annual exemption you have already used.
MeerwaardeTool does that arithmetic for you. You import your broker's export (DEGIRO, Saxo Bank, MEXEM or Bolero) and the tool calculates your realised capital gains and what is left of your exemption.
What the calculation rests on
Every rule on the From law to figure page cites the statutory article or circular it rests on.
Not every source carries the same weight. We rank them in tiers, and when sources contradict each other, the higher tier prevails.
Tier 1
Statute, royal decree, circular and the FPS Finance
Tier 2–3
Government statements, tax firms and academic work
Tier 4–5
Financial press and forums
Where your data is stored
Your data is stored on Microsoft Azure, West Europe region, within the European Union.
Which data we process and how long we keep it is set out in the privacy policy.
Read the privacy policy →What we never do
Three things have no place in MeerwaardeTool, not now and not later.
- We do not sell your personal data.
- We place no affiliate links: no broker pays us to be recommended.
- We give no tax advice: MeerwaardeTool calculates, a tax adviser advises.
Contact
A question about the tool, your calculation or your account? Send us a message through the contact form; a person will reply.
Go to the contact form →MeerwaardeTool gives an estimate based on the law and the circular, not tax advice. If you are unsure about your own situation, ask a tax adviser.