I don't even try to track individual trades. That would be way too hard. I just write down how much I have in my trading stash (in dollars) at the start of the year and at the end of the year, so I can put my capital gain or loss on my taxes by just subtracting those two numbers. I do track my daily profits for myself, not for tax purposes. But just the raw dollars I'm making, I don't write down anything about the specific trades.

Last year I sold out of any trades I was in on Dec 31st so I knew what I ended the year at, and bought back in a couple days later. And at the end of this year I'll do the same so it's real easy to keep track of what I need for taxes.