What is debt-to-income ratio?
Your debt-to-income ratio (DTI) compares required monthly debt payments with gross monthly income. Lenders often use it as one part of an affordability and underwriting review. A lower percentage means less of your pre-tax income is already committed to debt payments.
DTI does not measure every household expense and it is not a complete picture of financial health. Two people with the same ratio can have very different taxes, living costs, savings and income stability.
Front-end versus back-end DTI
Front-end DTI includes only the monthly housing obligation. Depending on the loan and market, that may include rent or mortgage principal and interest plus property taxes, homeowners insurance, association dues and similar required housing costs.
Back-end DTI includes housing plus other required debt payments, such as credit-card minimums, car loans, student loans and court-ordered obligations that a lender requires you to disclose.
DTI formulas
Front-end DTI = monthly housing payment ÷ gross monthly income × 100
Back-end DTI = total required monthly debt payments ÷ gross monthly income × 100
If gross income is 6,000, housing is 1,800 and other debts total 900, the front-end ratio is 30% and the back-end ratio is 45%.
What should you enter?
- Use income before tax and payroll deductions, converted to a monthly amount.
- Use required monthly payments rather than total balances.
- For credit cards, use the required minimum shown on the statement.
- Include the complete housing obligation when estimating mortgage affordability.
- Do not count utilities, groceries, subscriptions or ordinary insurance unless a specific lender instructs you to include them as debt.
What is a good DTI?
There is no universal approval cutoff. Requirements vary by country, lender, loan program, credit profile, down payment and other compensating factors. Ratios around 36% and 43% are commonly discussed reference points in US consumer lending, but they are not promises of approval or rejection. Use the calculator to understand the ratio, then check the rules for the exact product and jurisdiction.
Ways to lower your ratio
You can reduce DTI by paying off obligations, refinancing only when it genuinely lowers required payments and total cost, avoiding new debt, or increasing stable documented income. Do not close accounts, move balances or take a new loan solely to influence an application without understanding the credit and fee consequences.
Limitations
This estimate does not evaluate credit history, assets, loan-to-value, interest-rate stress tests, employment history or residual income. It is an educational planning tool, not an underwriting decision.