Your debt-to-income ratio (DTI) compares qualifying monthly debt obligations with gross monthly income. Mortgage underwriting uses DTI as one part of a broader credit and eligibility review.
How to calculate DTI
DTI = qualifying monthly debt obligations ÷ gross monthly income × 100
For example, if qualifying monthly obligations total $2,500 and gross monthly income is $7,000, the DTI is about 35.7%.
Calculate your DTI
Enter monthly income and recurring debts to estimate your ratio. The result is educational and is not a mortgage approval decision.
Open DTI Calculator →Front-end vs. total DTI
A housing ratio looks at proposed housing obligations relative to gross income. A total or back-end DTI adds other qualifying recurring debts. The exact obligations included and how they are calculated depend on the mortgage program and underwriting rules.
There is no universal “safe” DTI
Underwriting limits are not the same thing as a recommended household budget. As a current example, Fannie Mae's Selling Guide states that manually underwritten loans generally have a 36% maximum total DTI, with possible eligibility up to 45% when specified credit-score and reserve requirements are met. Desktop Underwriter (DU) casefiles can allow up to 50%. Individual lenders can also apply overlays.
Other loan programs use their own rules. A ratio that is technically eligible can still feel tight once groceries, utilities, childcare, health costs, savings, maintenance, and other non-DTI expenses are considered.
What commonly counts in mortgage DTI?
Examples can include the qualifying housing payment, car loans or leases, student-loan obligations, credit-card minimum payments, personal loans, and certain support obligations. Treatment can vary by loan program and documentation.
What usually does not appear as recurring debt?
Everyday living expenses such as groceries, utilities, many subscriptions, and routine household spending are generally not part of the mortgage DTI calculation. They still matter when deciding what payment is comfortable for your budget.
Ways to change the ratio
- Reduce qualifying monthly debt. Paying off or paying down debts can change the monthly obligations used in underwriting, depending on the remaining term and program rules.
- Avoid unnecessary new debt before closing. New obligations can require the lender to recalculate DTI.
- Use accurate qualifying income. Lenders must document income under program rules; not every source of household cash flow can automatically be counted.
- Consider a lower housing payment. A lower loan amount, lower property costs, or a different purchase price can reduce the proposed housing obligation.
DTI and credit score measure different things
DTI measures monthly obligations relative to qualifying income. Credit scores summarize credit-report information and can affect eligibility or pricing depending on the mortgage program. Neither number alone determines the final loan decision.
Sources
- Fannie Mae Selling Guide: Debt-to-Income Ratios
- Consumer Financial Protection Bureau: Owning a Home
- MortgageCalculatorNow calculator methodology
Bottom line
Use DTI to understand how a lender may view recurring obligations, but use a broader household budget to decide what payment is sustainable for you.