Debt-to-income (DTI) ratio measures how much of your gross monthly income goes toward debt payments. Lenders look at two versions. The front-end ratio includes only housing costs (proposed mortgage payment, taxes, insurance, HOA). The back-end ratio includes housing plus all other monthly debts—car loans, student loans, credit cards, and any other obligations that appear on the credit report. Most conventional loans prefer a back-end ratio at or below 36–45%, while FHA can go higher with compensating factors.
Calculating your own DTI is straightforward. Add up the required monthly payments on all debts, then divide by gross monthly income. The proposed housing payment is estimated with a mortgage calculator or the affordability calculator. If the resulting ratio sits near or above typical limits, options include paying down revolving debt, increasing the down payment to lower the mortgage payment, or looking at a less expensive home.
Not all debt is treated equally. Student loans in deferment or income-driven repayment may be counted differently depending on the loan program and lender. Cosigned loans that someone else is paying can sometimes be excluded with proper documentation. Accurate calculation prevents surprises during underwriting.
Improving DTI before you apply expands your options and can lead to better pricing. Even a few months of focused debt reduction can move the ratio into a more comfortable range. Once the number looks solid, you can shop for the loan program—conventional, FHA, or VA—that best matches your overall profile.