I don't, and that, to me would be crazy as you may win today and loose it tomorrow and why would I pay tax on something NOT gained.
I don't pay taxes on gain until it reaches my bank. Keeping is simple.
Example: If I put in $10,000 and in 6 months the account grows to $16,000 and I withdraw $10,000, guess what, that is not taxable as it's not any "gain" according to bank records. Any withdrawals after that is gain and taxable (according to the IRS). But, that's just me. You know what everyone will tell you,, go to your CPA for details. The IRS is mostly ______,
(fill in the blank) with little knowledge of what is constitutional. Don't get me started on this but there are those who think "Capital Gain" and "income" means anything earned. I'll leave you to research and discover things about tax from the book called,
Cracking The Code that will give you a different incite as to the constitutional definition of "earned income".
As you can see, this topic just fires me up
so I'll just leave it for you to draw your own conclusions.