What is Debt-to-Income (DTI) ratio and how do lenders use it?

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DTI measures how much of your income is already spoken for by debt obligations. It’s calculated by dividing your total monthly debt payments by your gross monthly income, usually shown as a percentage. Lenders use this as a practical gauge of affordability and serviceability: if a large share of your income is already earmarked for debts, there’s less capacity to absorb a new loan payment without risking missed or late payments. In practice, this means including recurring monthly obligations like mortgage or rent, car loans, student loans, and credit card minimums when computing the ratio. The lower the DTI, the more room you’ve got to borrow and the more favorable your terms may be; higher DTIs signal greater risk and can limit loan size or require compensating factors. Thresholds vary by lender and product, but the concept remains central: it’s a clear measure of whether the borrower can realistically service new debt.