I had been a long-time account holder with IB. I sell futures options hedged with short futures. My trading style requires that I keep an eye on SPAN margin, which varies day-to-day. With IB, I was able to see the SPAN margin requirements BEFORE placing my trades. Because of this feature, trades were never rejected because of inaccurate margin calculations. I have found most platforms calculate margins as a fixed amount based on trading the futures. Has anyone found a decent alternative to IB's functionality in this respect? I currently have to call the Broker to find out the intial margin requirements for every short option trade. Then, because of the inaccuracy of the margin calculator, I have to phone in my futures hedge trade. Obviously, this defeats the purpose of online trading. If IB ever improves their customer service and policies, then I may return. Please post or message your thoughts.