@INVESTA33 borrow costs for easy to borrow stocks tend to be around 0.4% per annum, calculated daily on the value of the stock loan, which fluctuates with the stock price. The payment process varies, you can expect to be regularly billed by your lender. Difficult ones differ across stocks and 8% is in the ballpark for GXY, though prices can vary through time as well. In addition to the borrow cost, the borrower has to pledge collateral worth at least as much, which the lender can do whatever they want with. If they use cash, it means the lender can put it in the bank to earn some interest... not much right now I guess. There are data vendors with specific data on borrow costs and securities lending transactions they collect from participants if you want to have hard data.
