One of the biggest advantages of a fixed rate loan is the fact that the interest rate is fixed. This means that the rate does not change, no matter how interest rates are rising or falling. While it is possible the interest rates will fall during the time of your loan, if you get a low fixed rate, they are not likely to get much below, and far more likely to rise quite a bit above your original rate. If you have a variable rate, this can mean paying thousands of dollars more over the life of your loan.