For the Euro, the initial margin requirement is 2% (50:1), that's the margin required to open the position. But how much margin do you need to maintain the position? In other words, when will you get a margin call? Oanda for instance offers 2% (50:1) initial margin but has a maintenance margin requirement of only 1% giving you an effective leverage of 100:1. I emailed this question to IB and they told me to read the IB website, obviously if I could get clarification on their website I wouldn't need to email them Thanks guys for any help provided.