For example, if I have a student loan of $5000, and the interest rate is fixed at 6.0%. How often is the 6.0% added onto the principle? Do I add on 6.0% after every month or is it every year? For example, by month: First month: $5000 Second month: $5000 + 6.0% = $5300 Third month: $5300 + 6.0% = $5618 etc. By year the amount of interest would just be $300, but I'm not sure if that is the case. I can't find anywhere where it says how often interest is added either. Stop being a douchebag, Ms. Look It Up. Go look up in the dictionary on how to not be a jerkoff.