A reset mortgage allows for one interest rate reset during the life of the loan. If you have a 5/25, the mortgage rate will be reset after 5 years, to fully amortize at the end of the original 30 year period (i.e. after 25 more years). For a 5 5/8%, $100,000, mortgage, compute the reset payment if the new rate resets to 7 3/8%.