I have $5m at IB, almost all in index funds and Berkshire Hathaway. I'm interested in borrowing $2m against that to loan to an acquaintance (I'm comfortable with the collateral). Are there cheaper ways than just taking a margin loan? I started wondering about this after reading IB's announcement last month about being able to short US Treasuries. The $10m minimum is more than I want but I'd love to be able to borrow at 1.13%.