Preparing for the Belgian Meerwaardebelasting / Taxe sur les plus-values

So in Belgium a new capital gains tax was launched beginning this year. In short, 10% of tax on all the capital gains of all financial transactions (stock, ETF, crypto etc), using the reference value of Dec 31, 2025 as a baseline?

Is there a way to calculate these ‘capital gains’ using PP?

Government links

Capital gain for a specific time periode is possible.