Your debt-to-income ratio (DTI) compares your monthly debt payments to your monthly gross income. It's one of the key metrics lenders use when evaluating loan applications — particularly mortgages. A high DTI signals that you're stretched thin; a low DTI signals financial capacity to take on more debt.
How to Calculate DTI
DTI = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100. Example: If your monthly debt payments total $1,500 (rent/mortgage, car loan, student loan, minimum credit card payments) and your gross income is $5,000, your DTI is (1,500 ÷ 5,000) × 100 = 30%.
Front-End vs Back-End DTI
- Front-end DTI: only housing costs (mortgage, property tax, insurance) ÷ gross income
- Back-end DTI: all debt payments ÷ gross income — this is what most lenders focus on
- Ideal front-end DTI: below 28%
- Ideal back-end DTI: below 36%; many lenders accept up to 43%
- FHA loans may allow back-end DTI up to 50% with compensating factors
Why DTI Matters for Mortgage Approval
Conventional mortgages typically require a DTI of 43% or lower. A lower DTI often qualifies you for better interest rates. If your DTI is too high, lenders may offer less favorable terms, require a larger down payment, or decline the application entirely.
How to Reduce Your DTI
- Pay off or pay down existing debt before applying for a mortgage
- Avoid taking on new debt (car loan, new credit card) before a major loan application
- Increase your income through a raise, promotion, or second income source
- Refinance existing high-payment loans to lower monthly obligations
DTI only counts recurring debt payments — not expenses like groceries, utilities, or subscriptions. Lenders use gross income (before taxes), not take-home pay.
