i keep 30k in my IB account to trade futures and sweep profits every 2 weeks......now if i want to short 100k EUR/USD fx.....then how would this affect my cash balance and the margin left for futures? Also fx is treated like futures when it comes to taxes, right? 60/40 and one line accounting? or am i better off trading the FX futures? I prefer fx because i can trade 25k lots and scale in/out where as the fx contract is a 125k contract....which is pretty massive.......even the mini contract is about 75k (not sure on this one).