IANAA, but you file a gigantic "Schedule-D". I have never done it with crypto, but there is standard software to do it for non crypto stuff. I used GainsKeeper

IANAA, but you file a gigantic "Schedule-D". I have never done it with crypto, but there is standard software to do it for non crypto stuff. I used GainsKeeper: http://www.wolterskluwerfs.com/tax-reporting/solutions/gainskeeper-for-investors.aspx http://www.wolterskluwerfs.com/tax-reporting/solutions/gains... I see they do crypto, but I've never used it for that. For companies, they have entire departments that consolidate trades and construct massive Schedule Ds