The lesson
€10,000 can become €100,627 at 8% gross—or €51,276 at 5.6%.
This deliberately simple illustration converts an 8% gross annual return into 5.6% by applying a 30% levy to each year's gain. Over thirty years, €10,000 reaches €100,627 at 8% and €51,276 at 5.6%.
The €49,351 gap does not describe a real tax system. Tax may be applied at sale, annually, on income, on gains, differently across account types, or not at all in a particular circumstance.
That variation is exactly the lesson. Before comparing returns, identify the return that can remain invested after the rules that apply to you.
