I have a question for the community, maybe some of you here are a bit more familiar with a few tax issues that are bothering me.
I transferred my custody account from Onvistabank to ING in 2025. As there were sanctioned securities in my Onvistadepot, the custody account still exists and the 2025 loss pot was not transferred to ING. If I have now realized gains at ING in 2025, can I request a loss declaration from Onvista and claim this on my tax return for 2025?
On Thursday, I have withdrawn from the values $WCH (+2,17%) and $AFX (-1,68%) at a loss, these losses were also shown in the loss pot at ING. Now, on Friday, I sold my $ROG (+1,56%) with profit on Friday, but I paid the full rate of capital gains tax on the profits and the loss pot remained unchanged.
Does anyone have any experience with this? In my opinion, this should be offset directly.
I know this is a very dry topic, but I would be grateful for any feedback 😁

