Hi, does anyone know how a long/short portfolio is margined at IB? Not the risk component but the financing costs? Let's say I'm holding 100k of stocks (diversified, highly correlated with SP500) and I'm short 100k of SPY. My best guess is I pay the borrowing rate on the long stock and receive the short rebate rate on the short stock. Any ideas? Traveler
Go here: http://www.interactivebrokers.com/en/accounts/fees/interestMethods.php There are examples at the bottom of the link that you can scroll down to. In general you are correct but the $ amount determines whether or not you'll get paid on the short-generated "fictitious credit". Jack