How to calculate your debt-to-income ratio (and why lenders care so much)
Your debt-to-income (DTI) ratio is one of the most important numbers in your financial life. Lenders use it to decide whether to approve you for a mortgage, car loan, or credit card. Understanding yours gives you power in the borrowing process.
How to calculate DTI
The formula is simple:
DTI = (Total monthly debt payments / Gross monthly income) × 100
Monthly debt payments include your mortgage or rent, car loan, student loan payments, credit card minimum payments, and any other recurring debt obligations. They do not include utilities, insurance, or groceries.
Example: Your gross monthly income is $6,000. Your monthly debts are:
- Mortgage: $1,800
- Car loan: $400
- Credit card minimum: $150
- Student loan: $250
- Total: $2,600
DTI = (2,600 / 6,000) × 100 = 43.3%
What lenders consider good
Below 36%: Excellent. You have room in your budget for additional debt payments. This is the target most lenders want to see.
36-49%: Acceptable but tight. You might still qualify for a loan, especially if you have a strong credit score and large down payment.
50% or above: Problematic. Most lenders will reject your application. You have too much debt relative to your income.
Why lenders care about DTI
DTI is the best predictor of whether you will default on a loan. Borrowers with DTI above 50% are significantly more likely to miss payments. Lenders use DTI as a gatekeeper — if your ratio is too high, you are a risk they will not take.
How your DTI affects mortgage approval
For a qualified mortgage, the maximum DTI is typically 43% for manual underwriting. Many lenders prefer 36% or lower. Your DTI directly affects the loan amount you qualify for. A lower DTI means you can borrow more.
How to improve your DTI
Two approaches: increase income or decrease debt. The fastest fix is paying down credit card balances (which lowers your minimum payment). The second fastest is paying off a car loan or small debt entirely. Avoid taking on new debt before applying for a major loan.
Use the Loan Comparison Calculator to see how different loan terms affect your monthly payment and DTI.