Quote from Kicking:
I read that you have to declare all securities held on 01/01 of the fiscal year. I understand that it is for the purpose of determining dividend tax and tax on interest payments. This means however that you end up declaring that you buy and sell securities which can lead to further investigation and the requalification of your trading as a gainful activity.
On 12/31 exactly.
Just sell everything on the 12/31. You only have cash.