DTI definition
Debt-to-income ratio, usually shortened to DTI, compares recurring debt obligations with income over the same period. A common form divides total monthly debt payments by monthly gross income and multiplies by 100%. This is a ratio of recurring payments to income, not the total outstanding debt balance divided by annual earnings.
Simple example
If recurring monthly debt payments total 600 and gross monthly income is 3,000, the simple DTI calculation is 600 ÷ 3,000 = 20%. The exact obligations and income categories included can differ between lenders and jurisdictions. Now imagine a proposed new monthly repayment of 300 is added to the existing 600. If the lender counts both, the illustrative DTI becomes (600 + 300) ÷ 3,000 = 30%, not 20%. These figures are examples, not approval criteria.
Why lenders may look at DTI
DTI is an affordability indicator. A high share of income already committed to debt can leave less capacity for a new payment. It is not normally the only input: lenders can also consider credit history, expenses, assets, employment stability and the requested product.
Important limitations
- There is no single universal DTI threshold.
- Gross-income and net-income methods are not interchangeable.
- Different lenders can classify debts differently.
- DTI does not capture every household expense. Two borrowers with the same DTI can have different living costs and very different cash left after essential spending. A lender may use a broader affordability or disposable-income test.