Yeah, our rates are pretty expensive by comparison! The main difference is that in the US your shares are not held in your own name, they are held in the name of the broker in trust for you or something like this. So there is some risk if the broker goes bust, which is not the case here in Aus with our CHESS system. But they have an insurance policy through the "SIPC" that covers them for this to some extent. Some investment banks in Aus use a similar structure to give margin loan rates around 4% or so, but still not as cheap as Interative Brokers. There's a few other differences, like no margin calls, ie. they can just sell the shares when you breach the max LVR without telling you and the max LVR is about 50%, so much lower than you can get here. They recently just stopped offering margin to Aus investors due to some licensing issue in Aus, but only for accounts in your own name, trust accounts were still ok the last time I checked. I would consider using them for only a portion of my lending, but for peace of mind have stuck with regular Aus margin lenders to date.