I agree with Jackkk that the answer is 4,999 €. This has been clarified; section 2.2 of the Tax Administration’s guidance lists sales included in turnover, and in my view, securities trading conducted on one’s own account is not considered sales of financial and insurance services. A written ruling was once sought from the Tax Administration regarding the VAT threshold relief. When securities are sold, it is not a sale of a service.
sales of financial and insurance services (VAT Act sections 41 and 44)