The website with the contact details is:
Kontakt - Bundesfinanzministerium - Service
I used the email address under "Postanschrift", which is:
[email protected]
There is also a phone number and if you can manage it then they may forward you to a capital gains responsible. When I tried they weren't at office anymore and they asked me to write a mail.
I used a short mail introduction to ensure that a low skill secretary understands that she needs to forward the mail to the Kapitalertragsteuer responsible. After the one liner I wrote a quite specific mail about the tesla split situation.
The guy on the phone also mentioned that he received the same request already. So I really hope that they get a high number of requests already. Unfortunately most people will react and call them for sure after the split when they eventually face negative euro accounts.
I just wrote them a mail since we need a written confirmation and a verbal one won't help us at a later court case.
In my mail, I informed them to be in direct contact with Martin and a larger group of German investors hoping this triggers them to answer as requested before August 21st.
German Tax Authorities usually do not care if we have sleepless nights and I would not be surprised not to get an answer at all or after August 31st.
I did ask them two questions:
#1 If they can confirm this not be a not taxable event since there is no additional value given although called Dividend
#2 If they can assure that Depots do not deduct a preliminary tax which would cause harm to stockholders