Русско-англо-русский юридический словарь

DEFINITION of 'Fixed Interest Rate'. An interest rate on a liability, such as a loan or mortgage, that remains fixed either for the entire term of the loan or for part of this term. A fixed interest rate may be attractive to a borrower who feels that the interest rate might rise over the term of the loan, which would increase his or her interest expense. (Investopedia)

First, some of your student loans, especially ones subsidized by the government, carry low interest rates. As a result, you are not significantly adding to the debt principal by paying it off over the term of the loan. (CNN Money)