I looked at my YTD statement and under the "Interest" category, I noticed that every month I have an entry called "USD Net Short Stock Interest for <insert month here>". Sometimes it's a credit, but usually it's a debit. The amount is never really very much in either direction, but why would it ever be a credit? Isn't there always a borrowing cost associated with shorting stocks? I'm always short some stocks, often hedged with options.