Debt Ratio Gross monthly payments divided by gross monthly income, expressed as a percentage. There are typically two debt ratios to be considered: The housing ratio—sometimes called the front-end or front ratio—is the total monthly house payment, plus any monthly tax, insurance, private mortgage insurance, or homeowners association dues, divided by gross monthly income. The total debt ratio—also called the back-end or back ratio—is the total housing payment plus other monthly consumer installment or revolving debt, also expressed as a percentage. Loan debt ratio guidelines are usually denoted as 32/38, with 32 being the front ratio and 38 being the back ratio. Ratio guidelines can vary from loan to loan and lender to lender.