Hi all! i'm having trouble to understand IB's buying power calculation method.. example: 53K account, 33K cash,20K-bonds. buying power=111K. bought and short some stocks today, roughly equal for both sides.. total portfolio amount was about 40K-45K and at that time my buying power went almost to zero.. looks to me that they only allow me to borrow against my cash and not typical 4:1, but 1:2. that is-if you have 30K cash-then you can have 15K additional funds for intraday from IB. ridiculously low, but i can understand that.. but what about 111K buying power? how did they come up with those numbers? can anyone explain this to me? Thank you!