Debt-to-Income Ratio: What the Number Does—and Does Not—Tell You
Learn how DTI is calculated, practice a simple example and understand why a ratio is neither a complete household budget nor a mortgage approval.
Debt-to-income ratio, or DTI, describes a relationship between monthly debt payments and gross monthly income. It helps frame a borrowing conversation, but a single percentage cannot describe every part of your finances.
Start with the calculation
Divide monthly debt payments by gross monthly income and multiply by 100. Gross income is income before taxes and other deductions. In a fictional example, $2,100 in monthly debt payments divided by $6,000 in monthly gross income equals 35%. Use monthly amounts on both sides of the calculation so the comparison is consistent.
Know which question you are answering
Housing costs alone divided by income produce a housing ratio. Housing plus other included debts produces a broader debt ratio. Lenders determine the income and obligations that count under their requirements; loan products can have different limits. An online estimate should not be treated as a promise that a particular lender will approve an application.
Keep a separate household view
Try the academy’s DTI calculator with fictional figures and change one payment at a time. Then write down what the result measures. For your own planning, keep a separate list of living expenses and savings goals rather than assuming that everything outside the ratio is available to spend. A useful preparation exercise is to label each figure, its time period and whether it still needs confirmation.
Sources and further reading
Source guidance reviewed for the published version. These articles provide general US mortgage education, not an approval decision or advice tailored to an individual transaction.
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