One of the popular ways to save money on mortgages is to use what is known as the biweekly mortgage payment plan. With the biweekly mortgage payment plan the borrower makes payments on his mortgage every two weeks, instead of once a month. The biweekly payment is one-half of the monthly payment. So, if you converted from a monthly plan to the biweekly plan and you had been paying $2,000 a month for your principal and interest, you would now be paying $1,000 every two weeks.