The Consumer Financial Protection Bureau (CFPB) defines debt-to-income ratio (DTI) as monthly debt payments divided by gross monthly income. Lenders use it as one way to evaluate whether a borrower can manage additional monthly payments.
The Debt-to-Income Ratio Calculator lets you model a housing payment and common recurring debts without assigning a pass/fail label to the result.
The quick answer
Add the monthly debt obligations you want to evaluate, divide that amount by gross monthly income, and multiply by 100 to express the result as a percentage.
CFPB says different lenders and loan products can use different DTI limits. The ratio is therefore useful for comparison, but a particular percentage is not a universal approval rule.
Use payments, not balances. A $12,000 credit-card balance does not go into the DTI numerator as $12,000. The relevant figure is the monthly payment obligation that applies under the lender's rules.
The DTI formula
DTI = total monthly debt payments ÷ gross monthly income × 100
If monthly debt payments total $2,800 and gross monthly income is $8,000, the modeled DTI is 35%.
Another way to read the same result is that the entered debt payments use $0.35 of each $1 of gross monthly income.
What gross monthly income means
Gross income is income before taxes and other deductions. CFPB's consumer guidance uses gross monthly income in the basic DTI formula.
Actual mortgage underwriting can be more detailed than simply dividing annual salary by 12. Current federal mortgage rules allow creditors to consider current or reasonably expected income from several sources, and creditors must verify the income or assets they rely on when evaluating repayment ability.
That matters when income includes self-employment, commissions, overtime, bonuses, rental income, retirement income, or other sources whose qualifying treatment may differ from the amount that appears in a personal budget.
What monthly debt to include
The simple consumer formula starts with recurring monthly debt payments. Common examples include:
- Mortgage or other qualifying housing debt
- Credit-card minimum payments
- Vehicle loans or leases
- Student loans
- Other installment loans
- Recurring support or maintenance obligations when applicable
- Other recurring debt obligations counted by the lender
A lender may apply program-specific rules to debts with unusual payment schedules, deferred payments, debts close to payoff, jointly held obligations, or other special circumstances. Use the calculator as an estimate, not as a substitute for the lender's underwriting worksheet.
How housing fits into DTI
For a mortgage scenario, the housing amount should reflect the monthly housing obligation being evaluated rather than only the loan's principal-and-interest payment.
CFPB's home-affordability guidance notes that property taxes, homeowners insurance, private mortgage insurance when applicable, and homeowners association fees can be part of the monthly housing cost. A lender's qualifying payment can follow program-specific rules, so use the number from the loan scenario you are actually comparing.
The Sunset Guardian calculator also shows housing as a percentage of gross income. That is a useful planning figure, but it is displayed separately from total DTI because underwriting terminology and treatment can vary.
A complete example
Assume gross monthly income of $8,000 and these monthly obligations:
- $2,000 housing payment
- $150 credit-card minimums
- $450 vehicle payment
- $200 student-loan payment
The entered monthly debt total is $2,800. Housing alone equals 25% of gross income. The other entered debts equal 10%. Total modeled DTI is 35%.
The $5,200 is still gross income. Taxes, food, utilities, insurance, savings, repairs, and other expenses have not been subtracted.
Why there is no universal DTI cutoff
CFPB's consumer guidance says different loan products and lenders have different DTI limits. Current Regulation Z commentary also says the Qualified Mortgage rules do not prescribe one particular DTI threshold that every creditor must use.
Mortgage investors and loan programs can publish their own detailed underwriting rules, and automated underwriting can evaluate factors beyond a single ratio. This is why the calculator does not color a result green, yellow, or red.
Avoid treating 43% as a universal rule. Older mortgage explanations often centered on that figure. Current federal Qualified Mortgage rules do not make one DTI percentage a universal approval line.
DTI is not a household budget
DTI looks at debt relative to gross income. It does not subtract income taxes, groceries, utilities, transportation costs that are not debt, child care, medical spending, repairs, savings, retirement contributions, or many other real cash-flow needs.
CFPB specifically cautions that the amount a lender is willing to lend can be different from the amount that comfortably fits a household's budget. Savings priorities and the other costs of owning a home still matter.
A lower DTI can create more room, but the ratio should sit next to a real spending plan rather than replace one.
How DTI changes
DTI falls when qualifying gross income rises, counted monthly debt payments fall, or both. Paying off a debt can therefore improve the ratio when the monthly obligation disappears from the calculation.
Reducing a balance without changing the required monthly payment may have little immediate effect on a simple DTI estimate. The payment obligation is what drives the numerator.
When comparing a future mortgage, changing the proposed housing payment can have a large effect because the housing obligation is usually one of the biggest monthly entries.
How to use the calculator
Gross monthly income
Enter income before taxes and other payroll deductions. For an actual loan application, use the income amount the lender says qualifies under the program's documentation rules.
Monthly housing payment included in DTI
Use the current or proposed housing obligation you want to model. For a mortgage scenario, include the applicable monthly housing costs rather than principal and interest alone.
Credit cards, vehicles, student loans, and installment loans
Enter monthly payment obligations rather than balances. Avoid entering the same debt in more than one field.
Support and other recurring debt
Use these fields for applicable recurring obligations not already captured above. If you are unsure whether a lender will count something, run the estimate both ways and confirm the lender's rule.
Frequently asked questions
Is DTI based on gross or take-home income?
The standard DTI calculation uses gross income before taxes and other deductions.
Do I enter credit-card balances?
No. DTI uses monthly debt-payment obligations. The lender's rules determine the payment amount used for underwriting.
Does rent count as debt?
Rent is a housing expense rather than borrowed debt. The calculator's housing field is intended mainly for a current or proposed mortgage obligation. If you are using the tool only for a personal housing-share comparison, you can enter rent, but that should not be treated as a prediction of lender underwriting.
Is 43% the maximum DTI for every mortgage?
No. CFPB says limits vary by lender and loan product, and current federal Qualified Mortgage rules do not prescribe one universal DTI threshold.
Can a lender calculate a different DTI than this tool?
Yes. Income verification, debt treatment, the qualifying housing payment, and program-specific rules can all change the lender's result.
Does a lower DTI automatically mean a loan is affordable?
No. DTI omits many household expenses and savings priorities. Use it as one measurement alongside the rest of the budget.
Sources and further reading
- Consumer Financial Protection Bureau: What is a debt-to-income ratio?
- Consumer Financial Protection Bureau: How can I figure out if I can afford to buy a home and take out a mortgage?
- Consumer Financial Protection Bureau: What is a Qualified Mortgage?
- Consumer Financial Protection Bureau: Official interpretations of Regulation Z section 1026.43
- Fannie Mae Selling Guide: Debt-to-Income Ratios
Run the ratio, then check the real budget
Debt-to-Income Ratio Calculator
Estimate total DTI, housing share, non-housing debt share, and monthly debt relative to gross income.
Open tool →Debt Payoff Strategy Calculator
Compare debt avalanche and debt snowball payoff order when reducing monthly obligations is part of the plan.
Open tool →Use DTI as a comparison tool, confirm what an actual lender counts, and keep the rest of the household budget visible when deciding what payment is comfortable.