I have never traded on margin because of the extra risk and just not liking taking a loan. Now I'm thinking about taking small trades on margin. Say I take a small day trade on margin. For this sake let's say a 100 share, 20$ trade. So I take a 2,000$ trade on margin hold it to around close and sell it for a small profit. How would my interest be compiled for that few hours. Scottrades rate would be 10.25. Thanks.