NAR assumes a mortgage rate of 3.9 % for all areas, with the monthly principle and interest payment limited to 25 % of income. (businessinsider.com)
This chart below illustrates how the original principal amount and the length of term interact to determine the monthly principle only payment. (growingfamilybenefits.com)
Eliminating your monthly principle and interest payments can be very freeing, however. (mortgagecalculator.biz)