I have a trading account with Flatex since ... 2014 I think. In early 2015 I managed to have a positive gain(+2K) that was taxed automatically with each transaction but towards the end of the same year I managed to go negative(-2K), losses that I never managed to recover (my balance is negative still today) and never did this offset with taxes. This year, when I will be filling the taxes for 2018, I plan to offset these losses against the tax I payed(hope i expressed it correctly). The problem I am facing is that in Flatex I can only claim this for 2019 and need to pick one of these 2 options: 1. Verlustbescheinigungen über die Höhe des nicht ausgeglichenen Verlustes aus der Veräußerung von Aktien (soweit zum Jahresende anrechenbare Verluste vorliegen) 2. Verlustbescheinigungen über die Höhe des nicht ausgeglichenen Verlustes ohne Verlust aus der Veräußerung von Aktien (soweit zum Jahresende anrechenbare Verluste vorliegen) Q1: I think i need to go for option 1. but I am not sure. Basic idea is that I continued trading afterwards but the loss just got slightly smaller. I just want to reset everything (currently if I have a positive gain this is not taxed automatically with the 25% anymore due to that big loss that just gets reduced accordingly). Is 1 correct or I need to go for option 2 ? Q2: I am allowed in Flatex to pick one of the 2 options only for Steuerjahr 2019. Does this mean I cannot use it when I am applying this year for 2018 and just need to wait untill next year ?