Quote from not4kids:
This causes a lot of confusions even among professional tax accountants. Let's look at IRS tax rule:
âSuch person recognizes gain or loss on any security held in connection with the trade or business at the close of any tax year as if the security were sold for its fair market value on the last business day of such taxable year, and
âAny gain or loss is taken into account for such taxable year. (IRC section 475(f)(1)(A).)â
The code then explains that gains and losses from applying the mark-to-market provision, while they may be ordinary income or loss, they are not subject to self-employment taxes (IRC section 475(f)(1)(D)). That is, the ability to avoid self-employment taxes from this section does not apply to realized gains or losses; it merely applies to the revaluation of a portfolio of securities from cost to market value occurring at the end of a tax year.
In other words, any realized gains and losses from your trading are subject to self-employed tax, and those unrealized gains/losses are not subject to SE tax. I hope this will settle the argument once for all. Those who don't believe my understanding should try to look for a really good lawyer or find a new accountant to fix your previous tax returns.