BND student loans start accruing interest as soon as the loan funds are disbursed to the school. You may make payments at any time toward your balance. At the end of your in-school deferment and grace period, any unpaid interest is capitalized (added to your principal balance). The more interest that is capitalized, the higher your loan payment may be when you finish school. If you can afford it, make a smart move by making payments while you are in college.