When you apply for a mortgage, lenders look at a variety of numbers to determine your creditworthiness. While your credit score often gets the most attention, there is another metric that is arguably just as important, if not more so: your Debt-to-Income Ratio (DTI).
Your DTI is a simple percentage that represents how much of your monthly income goes toward paying off debts. Lenders use this to gauge your ability to manage monthly payments and repay the money you plan to borrow. In this guide, we'll break down exactly how to calculate your DTI, what lenders consider a "good" ratio, and how you can lower yours to secure a better mortgage rate.
The math behind DTI is straightforward: divide your total monthly debt payments by your gross monthly income (your income before taxes). Multiply the result by 100 to get a percentage.
(Total Monthly Debt Payments / Gross Monthly Income) × 100 = DTI %
For example, if you pay $500 for a car loan, $300 for student loans, and $200 in credit card minimums, your total debt is $1,000. If your gross monthly income is $4,000, your DTI is 25%.
Mortgage lenders typically look at two different versions of your debt-to-income ratio:
Wondering how a new mortgage would affect your DTI? Use our mortgage calculator to estimate your monthly payments.
Calculate Mortgage PaymentWhile every lender has different criteria, there are general benchmarks used across the industry:
| DTI Range | Lender's Perspective |
|---|---|
| 36% or Less | Ideal. You are seen as a low-risk borrower. |
| 37% – 43% | Acceptable. Most lenders can still work with you. |
| 44% – 50% | Strict. You may need a higher credit score or more cash reserves. |
| Above 50% | Risky. Approval becomes very difficult without significant mitigating factors. |
Lenders care about DTI because it is a proven predictor of default. Borrowers with high DTIs are more likely to run into trouble when unexpected expenses arise. If a large portion of your income is already spoken for, you have less "wiggle room" for car repairs, medical bills, or home maintenance.
Furthermore, your DTI directly affects your maximum loan amount. Even if you have a perfect credit score, a high DTI can cap the amount a bank is willing to lend you, potentially pricing you out of the home you want.
If your DTI is currently too high for the mortgage you want, there are two main ways to fix it: increase your income or decrease your debt.
Not all debt is created equal. Lenders look at the monthly payment, not the total balance. If you have a $2,000 loan with a $200 monthly payment and another $2,000 loan with a $50 payment, paying off the first one will lower your DTI significantly more than paying off the second, even though the total debt reduction is the same.
The months leading up to a mortgage application are not the time to buy a new car or finance furniture. Any new recurring payment will immediately spike your DTI and could jeopardize your mortgage approval.
If you have a side hustle or freelance income, ensure it is properly documented on your tax returns. Lenders typically want to see a two-year history of self-employment income before they will include it in your gross monthly income calculation.
Your Debt-to-Income ratio is a vital sign of your financial health. By understanding how lenders calculate and view this number, you can take control of your mortgage application process. Don't wait until you're in the middle of a home search to check your DTI—calculate it today, and if it's above 43%, start focusing on paying down smaller debts to give yourself the best chance at a favorable loan.