Hi all, Just a quick beginners question RE: futures margins. How is initial and maintenance margins used against your account. Say for a ES contract with IB. (intraday = 2813 and maintenance = 2250). If I had US$5000 in an account, would that mean I would not be able to open a position? I'm getting different answers through a search on the web. At first I thought maintenance margin was calculated against the value of your position as well (so say if ES went down 5 ticks), it would not reach your maintenance margin because the value of your position is still >$2250. But on the IB margins page it says the maintenance margin is required in cash in addition to the initial margin ($2813 + $2250). Does this apply to all brokerages? Thanks in advance.