US Total Housing Expense Explained

In the US, total housing expense combines monthly mortgage principal, interest, insurance, taxes, and often PMI, HOA fees, or utilities, depending on lender requirements.
Lenders compare total housing expense with gross monthly income to calculate the housing expense ratio, often called the front-end ratio, with ~28% commonly preferred.
Using the sample budget, $7.5K in gross monthly income and $2.04K in housing costs produced a ~27% ratio, below the usual approval guideline.
Lenders also review debt-to-income, or back-end ratio, which adds student, auto, and credit card payments; ~36% is ideal, though some government-backed loans allow ~50%.
Approval and loan size also depend on qualifying ratios and LTV; a $300K mortgage on a $350K home equals ~86%, and some lenders require ~80%.