Most private loan programs are tied to one or more financial indexes, such as the Wall Street Journal Prime rate or the BBA LIBOR rate, plus an overhead charge. Because private loans are based on the credit history of the applicant, the overhead charge will vary. Students and families with excellent credit will generally receive lower rates and smaller loan origination fees than those with less than perfect credit. Money paid toward interest is now tax deductible. However, lenders rarely give complete details of the terms of the private student loan until after the student submits an application, in part because this helps prevent comparisons based on cost. For example, many lenders will only advertise the lowest interest rate they charge . Borrowers with bad credit can expect interest rates that are as much as 6% higher, loan fees that are as much as 9% higher, and loan limits that are two-thirds lower than the advertised figures.