When applying for a mortgage, one of the most important numbers lenders review is your Debt-to-Income Ratio (DTI) . Simply put, DTI measures how much of your monthly income goes toward paying debts. The lower your DTI, the stronger your application and the better your chances of securing a great interest rate. Here’s what you should know: ✅ Conventional Loans  – Most lenders allow up to 43% DTI  (some may stretch to 49% ). ✅ FHA L