Thanks Alex, for your investigation!
I really hope it turns out to be a nontaxable event.
Otherwise, 2020 will be really bad for me.
I needed to change my portfolio due to the stock split so I did that in advance.
Invested 10000€ originally which is worth €50000 but due to the portfolio change, I will have to pay 26% on the €40000 in taxes.
Now the €50000 has been invested again and if we have to pay the dividend stock split taxes on that, that hurts.
Because then I invested €10000 and pay €10400 (portfolio change) + €13000 (stock split) on taxes. Meaning my €50000 is only worth €27000 and I will have to sell half of my shares to pay for the taxes.
Pretty crazy but correct calculation and a good example of how nuts it would be to tax again an already taxed amount with actually the exact same tax (Kapitalertragssteuer). It's absurd.