- DTI divides monthly debt payments by gross monthly income.
- Use required monthly debt payments, not account balances, in the basic calculation.
- Lender limits vary by product and underwriting rules.
- DTI excludes many living costs, so a manageable lender ratio can still feel unaffordable.
How to calculate monthly debt-to-income ratio, what lenders may use it for and why it is not a complete household budget. The examples below are explanatory, not product quotes or promises of approval, savings, coverage or investment performance.
The formula
DTI = total required monthly debt payments ÷ gross monthly income × 100. Gross income is generally income before taxes and payroll deductions.
Using the CFPB’s example structure, if required monthly debt payments total $2,000 and gross monthly income is $6,000, DTI is 33.3%.
What usually enters the numerator
- Mortgage or rent when required by the lender’s calculation
- Auto, student and personal loan payments
- Credit card minimum payments
- Court-ordered obligations when applicable
Groceries, utilities, childcare, taxes and insurance may not appear in the standard total even though they strongly affect affordability.
DTI is not a spending target
| DTI can help show | DTI does not fully show |
|---|---|
| Required debt load relative to gross income | Take-home pay after tax and benefits |
| Change after adding a proposed loan | Childcare, food, health and transport costs |
| A lender’s underwriting input | Emergency savings or job stability |
Use two calculations
Calculate lender-style DTI, then build a separate cash-flow test using take-home income and all essential expenses. If the proposed payment works in one calculation but not the other, the household budget is the more important warning.
Use the guide for a documented decision
Before acting on Debt-to-Income Ratio: Calculation, Uses and Limits, write down the facts that apply to your household: the current balance or coverage, the relevant deadline, the exact contract or account terms and the amount your budget can support. Then compare those facts with the official sources below and the latest documents from the institution, insurer, employer or government agency involved.
- Save the dated statement, disclosure, policy or plan document used in the comparison.
- Separate confirmed terms from estimates, marketing language and assumptions.
- Record the question that remains unresolved and who can answer it.
- Recheck the numbers after a rate, balance, income, law or household change.
Frequently asked questions
Is there one maximum DTI for every loan?
No. The CFPB notes that different products and lenders use different limits and underwriting rules.
Does paying off a credit card help DTI?
It can reduce the required monthly debt payment used in the numerator, but the exact underwriting treatment depends on the lender.
Should rent be included?
Mortgage underwriting commonly evaluates housing and total debt ratios. For personal planning, include housing in the broader cash-flow test even if a specific lender formula differs.
Sources and methodology
Primary official materials used for this guide. Checked July 28, 2026. Rules, limits and product terms can change.
- CFPB — What is a debt-to-income ratio? ↗Checked July 28, 2026
- CFPB — Debt-to-income calculator ↗Checked July 28, 2026