When you apply for a mortgage, car loan, or personal loan, lenders don’t just look at your credit score. They look at your debt-to-income ratio — and a high DTI can get you denied even with a great score.
What debt-to-income ratio means
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. It’s calculated like this:
Monthly debt payments ÷ Gross monthly income = DTI
If you earn $4,000/month and your monthly debt payments total $1,200 (rent/mortgage, car loan, student loans, credit card minimums), your DTI is 30%.
What lenders want to see
- Under 36%: Excellent — most lenders consider this low risk
- 36–43%: Acceptable for most loans but some lenders will add conditions
- 43–50%: High — will have difficulty qualifying for mortgages and premium loans
- Over 50%: Very difficult to get approved for most lending products
For mortgages specifically, most conventional lenders want to see a DTI of 43% or below. FHA loans allow up to 50% in some cases.
Front-end vs back-end DTI
Mortgage lenders often look at two numbers. Front-end DTI is just your housing costs (mortgage, insurance, taxes) divided by income — lenders want this under 28%. Back-end DTI includes all debt payments — lenders want this under 36–43%.
How to lower your DTI
- Pay down existing debt. Eliminating a car payment or paying off a credit card removes that monthly payment from your DTI calculation entirely.
- Don’t take on new debt before a major application. A new car loan right before applying for a mortgage can push your DTI over the limit.
- Increase your income. A raise, side income, or a second job increases the denominator of the equation. Even $500/month extra income meaningfully changes your ratio.
- Avoid opening new credit cards before a mortgage application. Even unused credit lines affect how lenders assess your potential future debt obligations.
DTI vs credit score
Your credit score and DTI measure different things. A credit score measures how reliably you’ve repaid debt in the past. DTI measures whether you can afford new debt payments right now. Lenders need both to be in good shape to approve you for a major loan.