Hi, I understand that if you trade under a prop firm you claim I think an S1. Questions: 1) Do you have to pay the self employment tax? 2) How much are you allowed to put into a 401K? 3) Can you write everything off? 4) If you trade from both a retail account and a prop firm, can you file EVERYTHING under the S1, so you don't have to pay the self employment tax for the winnings on the retail account? Thanks