Just a few thoughts.
The vast majority of traders fail to make money as I understand it. Upwards of 80-90%. So it seems fairly unlikely just on this basis alone that the IRS is going to have many "test cases" for trading futures in an IRA! Let alone situations where someone starts with $4K and makes a few millions off it.
Next, there are income limitations to the Roth IRA. Therefore, it would seem that the most likely traders to make "millions" in a Roth IRA are also the least likely to qualify to have one.
But to take it a step further, whether doing futures in a regular IRA makes sense would need to be penciled out. Here's what I mean: futures already have a tax preference. 60% of the gain is long term. Now assume you do futures in a regular IRA. When you take the money out, it comes out a regular income tax rates. In other words, you lose the preference of long term gains. What you gain is the deferred nature of taxation. Whether that makes up the difference would need to be penciled out.
But let's assume for a second that you're one of those traders who didn't make all that much money, so you could do a Roth IRA. Yet you possess the trading skills to make "millions" out of a few thousand, and you were just waiting for the Roth to show everyone what you can do. LOL! What you are being told is that this is a GRAY AREA.
For some reason GRAY AREA appears to be something that a few of you don't understand. What GRAY AREA means is that it was so ill-defined in the law that the tax experts aren't exactly sure how it will be interpreted when and if there are any test cases.
GRAY AREA typically also means that each test case is based on the SPECIFIC DETAILS of each situation. DETAILS become extremely important. I highly doubt that the tax experts are trying to create "fear and chaos" to keep anyone from trading in an IRA. The tax experts may just possess enough knowledge of various nuances that they are worried about how an audit would come down. This in the end is all they can tell you, along with what the consequences would be if you lost. It's up to you to make the decision.
Unlike the prior poster, I would be concerned about the consequences. Let's assume for instance that you do in fact make "millions", spread over a couple of decades. Try figuring out the taxes owed each year, with penalties EACH YEAR, compounding on you over a couple of decades. I would suggest that this could be something that would wipe you out.
I have no vested interest one way or the other. I am not qualified for a Roth IRA. So I don't have one. But I would suggest to all of you that you need to seek out some expert advice. If you can't afford a few hundred to get the advice, then you have to question what you're doing. You sure as hell aren't going to get it on a message board.
Finally, if you think that brokerage firms know all the answers here, think again. Brokerage firms have offered all kinds of tax advantaged investments in the past, some of which ended up being disastrous for their clients. If you're one who thinks they cuoldn't possibly offer something that wasn't right, take that hook out of your mouth. Not only could they, they have.
One final piece of advice. If you're truly good enough to take a few thousand, and build it into a few million, the taxes aren't going to make a damn bit of difference. Trust me on that one.
OldTrader