What DTI is and why lenders obsess over it
Debt-to-income ratio is your total monthly debt payments divided by your gross (pre-tax) monthly income. It's the clearest single signal of whether you can take on another payment without overstretching. Lenders use it because it predicts default risk better than income alone — a high earner drowning in payments is riskier than a modest earner with little debt.
Front-end vs back-end
- Front-end ratio counts only housing costs. Many mortgage guidelines want this under ~28%.
- Back-end ratio (the main DTI here) counts all debt payments. The common conforming-mortgage ceiling is 43%, with the sweet spot at 36% or below.
What counts — and what doesn't
Include: rent or mortgage, car loans, minimum credit card payments, student loans, personal loans, and other required debt. Exclude: utilities, groceries, insurance, subscriptions, and taxes — DTI measures debt obligations, not general living costs. Use the minimum required payment on revolving debt, since that's what lenders assume.
Lowering your DTI
Two levers: reduce debt or raise income. Paying off a small loan entirely removes its whole payment from the numerator and can noticeably drop your ratio — sometimes more effectively than chipping at a large balance. Avoid taking on new debt (or even large credit inquiries) in the months before a mortgage application, since lenders re-check DTI right up to closing. A DTI under 36% not only unlocks better loan terms; it's a sign your budget has genuine breathing room.