other capital claims (e.g. defaulted private loans).
Loss certificate required
To claim the losses for tax purposes, you need a loss certificate from your bank or broker. This must be applied for by 15 December of the respective year at the latest.
Only with this certificate can you:
declare losses in the tax return
offset losses across different banks
Note on share losses
Losses from share sales may only be offset against profits from share sales (sect. 20 para. 6 of the Income Tax Act (EStG)). Offsetting against interest or fund gains is not permitted.