Hey, I tried to contact IB about this, and their response to me was that they do not explain their own margin policies. (Even though my question was about not understanding their policy). Anyway, I have 2 questions. Yesterday I wrote 3 SEPT 1040C SPX option contracts. I received $350. Assuming that it didn't move and was still offered 3.5, what would my current margin requirement be? I wrote 40 SEPT QQQ 34c option contracts. They are now offered at .15 What is my margin required to hold them? These are both naked positions. This is from IB's site. Initial and Maintenance: 100% * option market value + maximum (((20% * underlying market value) - out of the money amount), 10% * underlying market value, $250 * number of contracts). 20% above is 15% for broad based index options. Short sale proceeds are applied to cash. I would appreciate any help. Thankyou.