Section 475(f) is the applicable section of the tax code. I assume the question relates, in general, to FICA taxes on a "professional"
trader.
The LLC makes a mark-to-market election. The income paid to the trader is CAPITAL GAINS INCOME THAT RECEIVES ORDINARY INCOME TREATMENT. Consequently, the income should be exempt from FICA taxes. I'm not a CPA, but I did fail the CPA exam 20 years ago (and, no, I didn't stay at a Holiday Inn Express last night).
That's why I'm a trader. This situation was reviewed for me by a
tax attorney at a very prominent firm. He agrees there's no
SS tax.
Unless you deal with a CPA who has done traders' returns, the CPA will probably insist you pay SS Taxes.
My CPA tells me I don't need to also make a mark-to-market election. However, if you are not trading through an LLC, I suggest going to
www.irs.gov and do a search on "trader taxes"
This will bring up a nice little IRS publication on the subject. It's pretty clear after you read it. If you find anything different, please post.
Now, here's a little problem I wasn't aware of---if you make over $128,500 per year, your itemized deductions are phased out at the rate of 3 % of the excess to a maximum of 80% reduction!!
So, don't make too much money!!!!!!!