A fixed-rate mortgage is exactly what it sounds like. It’s a mortgage for which the interest rate is fixed for the life of the loan. Fixed rate mortgages are available in multiple terms. The most common loan terms are 30 year, 20 year, 15 year, and 10 year loans. The monthly payment on a fixed-rate loan is inversely proportional to its term. The more years in a loan, the lower its monthly payment.