Refinancing Your Mortgage Can Lower Your Payment - How to lower mortgage payment. If you took out a fixed-rate mortgage several years ago and interest rates have since dropped, refinancing may lower your payments considerably. A $150,000 mortgage with a 30-year term and a rate of 8 percent, for example, carries a monthly payment of $1,100. The same mortgage at 6 percent will have a payment of less than $900 a month. Apply for lower payments today!