Original article updated 2026-07-30. Retained for reference. Confirm current requirements with an appropriate provider or administering agency.
Direct answer
Debt-to-income ratio compares counted monthly debt payments with gross monthly income. Different lenders and loan programs apply different limits, and the full credit and financial profile matters. A ratio that qualifies for a loan does not by itself show that the payment fits your household budget.
How mortgage DTI is calculated
Back-end DTI equals your required monthly debt payments divided by gross monthly income. Include the proposed housing payment, auto loans, student loans, minimum credit card payments, support obligations, and other counted debts. Front-end DTI looks only at the proposed housing expense. For example, $2,400 of counted monthly obligations divided by $6,000 of gross income equals a 40% back-end DTI.
How to improve your qualification
Review the calculation before applying through the mortgage preapproval process. The affordability planning guide can show how price, rate, and down payment change the ratio. Paying down a monthly obligation, choosing a lower payment, documenting stable income, or waiting until a debt is eliminated may help. See how to get a mortgage for the wider approval process.
Frequently asked questions
What is the difference between front-end and back-end DTI?
Front-end DTI uses housing costs only. Back-end DTI includes housing plus other required monthly debts and is usually the broader qualification measure.
Can I qualify with a DTI above 43%?
Possibly. Some programs and automated underwriting systems allow higher ratios when the overall file is strong, but lender and program limits still apply.
Primary sources for this update
- CFPB: What is a debt-to-income ratio?
- Fannie Mae B3-6-02: Debt-to-Income Ratios
- CFPB: What is a Qualified Mortgage?
These specific statements were checked on November 11, 2026. Requirements can change; verify the rules for your own loan.