The debt-to-income ratio (total-debt ratio) in home mortgage…

The debt-to-income ratio (total-debt ratio) in home mortgage underwriting that has been elevated to importance under the Qualified Mortgage provision of the Dodd-Frank Act, is defined as follows: PI is principal and interest payment TI is property taxes and home insurance payment (monthly equivalent) LTO is other monthly obligations that are long-term (close to a year or more) GMI is gross monthly income