Mortgage companies use ratios to analyze your mortgage payment. The housing payment ratio (or front ratio) used in this calculation is 30%, or (1,553.27 / 5,177.56).
The housing expense, or front ratio, compares your total mortgage payment to your monthly income.
The total debt expense ratio (or back ratio) is 36%, or [(1,553.27 + 310.65) / 5,177.56].
This total debt expense, or back ratio, compares your total monthly obligations including your total mortgage payment to your monthly income.