The monthly mortgage payment on a 400,000 loan for 30 years amortization period for 5 year fixed mortgage 3.7% rate is $1,834.76. It will cost you 260,000 in mortgage interest if will take that long for you to pay the mortgage. Remember that most of the interest paid in the first 5 years of your mortgage. In order to speed up the payent process you can do double payments or biweekly. If you take the same mortgage with biweekly payments your biweekly payment will be $ 846.11 which is $142 less per month.