Can anyone clarify for me how to calculate "basis" in terms on an LLC for trading? I do not mean the cost basis of the options/stock purchased but the LLC basis? Where I am confused is this...I lost about 3K in my LLC this year. When I pull a report from Maxit with my trades I have buy to open orders totaling somewhere around 150K. The money I directly deposited into my LLC brokerage account is about 20K. The 150K came from reinvesting profits I realized from option trades. So is my basis the 20K I put into the brokerage or is it the 150K of total purchases I made? Can I have a 150K basis with 3K in loses for the year? If so can I deduct items (even though I had a loss) from my AGI (regular job income) greater than the 3K?