90% of prop shops give k-1's. you sign papers to become a b class non voting member of the llc and get a k-1. ask don bright he'll explain it. as i said everything i printed from green and co's website is law period. its not maybe or this are that its law. green is on every tv show and print publication on earth and is the leader on all trader taxes. fist of all understand the laws. 475 mark to market accounting means one must mark to market all trades at year end wether a loss or gain and pay taxes on it even if you don't sell. example is i'm in 10k ibm at $115 and it closes year end at $120 which means i have a tax gain of $50k. my cost basis then becomes $120 on ibm stock. the only people that pay fica taxes on stock sales are dealers like market makers that carry inventory and if you incorporate you pay fica when you withdraw.but the good thing is one can segregate accounts and say 1 account is long term subject to the better long term rates and one is short term and mtm accounting. i assure you all i've said today is the law. go to a few sites like tradertaxes.com and read up on it