However, calculating the overall savings of the 15-year note over the 30-year note depends on several individual circumstances, such as the borrower's changing income status.
 

What about splitting my mortgage in two and paying bi-weekly?   
Answer: Some people set on paying off their home loan early and reducing interest charges opt for a biweekly mortgage. Monthly payments are divided in half, payable every two weeks.
Because there are 52 weeks in a year, the program results in 26 half-payments, or the equivalent of 13 monthly payments per year instead of 12. Using the biweekly payment system, a homeowner with a $70,000, 30-year biweekly mortgage at 10 percent interest could save $60,000 in interest and pay off the balance in less than 21 years. 
 
Are 40-year mortgages a good idea?    
Answer: Smaller monthly payments are the primary advantage of adding 10 years to the traditional 30-year mortgage, but real estate experts say the shorter-term loan usually is more beneficial for the home buyer. The drawback becomes apparent simply by calculating the cost of additional interest payments, which can total thousands for a few dollars difference in mortgage payments.