Quote from opt789:
Most of you are completely misinformed, and frankly I am getting a little tired of explaining this. If you donât even know the very basics of trader taxes I doubt you know enough to remain a professional trader for long.
Self employment taxes are not due on capital gains. Period, end of statement, end of discussion, donât bring it up again.
âTrader statusâ is not some box you check or form you fill out like mark to market. If you file you taxes and put your gains on schedule D and your expenses on schedule C then you are in effect claiming Trader status.
If you are in a situation like a member of an exchange or have an employment situation where the IRS views your capital gains as ordinary income, then you have to pay self employment taxes. Notice the distinction here, SE taxes are due on ordinary income, they are never due on capital gains, so whether you pay SE taxes is not dependent on mark to market or trader status but on how your income is being reported and viewed by the IRS.
If you are just a trader sitting at home trading in a retail account, then you can deduct all your expenses and not pay SE taxes if you meet their trader status guidelines as far as trading enough, consistently enough, have enough at risk, etc. Their guidelines are ambiguous and there is a plethora of information on the web about whether you will pass an audit or not. If you choose mark to market you lose the 60/40 treatment of section 1256 contracts, so you would only want to do that for securities, but it has nothing to do with SE taxes or whether or not you can claim trading expenses.