You can apply a second student loan, but you must be very careful. Here are some statistics for you to consider. Right now, the maximum interest rate on a new Perkins loans is 5%; on Stafford loans, it is 6.8% and on PLUS loans, borrowers pay 7.9% if they borrow through the direct loan program and up to 8.5% if they borrow from a bank or other, non-governmental lender.