I trade with IB and I am thinking of changing over to Portfolio Margin next week and would like to get some feedback on the pros and cons. My thinking is that I can sell some EFPs and earn a little bit more interest on my money and with Portfolio Margin I will only required to tie up Less than 1% (I think based on the information on IB)of my funds for margin. With Reg T it appears that I will tie up a lot more of my funds and have lower leverage. I mostly day trade and almost never carry overnight a long position. I do once in a while carry over a short position overnight but I will not have to pay interest on that anyway. From What I read on the IB website I will still only get about 3X intraday leverage on shorts but I have also read that the actual leverage could be less with portfolio than with Reg T so I am wondering if anyone has had some experience doing what I am thinking of doing.