The 15-year fixed rate mortgage offers two big advantages for most borrowers: You own your home in half the time it would take with a traditional 30-year mortgage. You save more than half the amount of interest of a 30-year mortgage. Lenders usually offer this mortgage at a slightly lower interest rate than with 30-year loans. It is this lower interest rate added to the shorter loan life that creates real savings for 15-year fixed rate borrowers. The possible disadvantages associated with a 15-year fixed rate mortgage are: The monthly payments for this type of loan are roughly 10 to 15 percent higher per month than the payment for a 30-year. And, because you’ll pay less total interest on the 15-year fixed rate mortgage, you won’t have the maximum mortgage interest tax deduction possible.