Understanding Debt-to-Income Ratio: The Number That Determines Your Mortgage

Published March 13, 2026 · 6 min read

You can have a perfect credit score and a solid down payment, but if your debt-to-income ratio is too high, you won't get approved for a mortgage. DTI is the gatekeeper of homeownership, and understanding it puts you in control.

What Is DTI?

Debt-to-income ratio compares your total monthly debt payments to your gross monthly income. Lenders use two versions: front-end (housing costs only) and back-end (all debts). Calculate yours instantly with our Debt-to-Income Ratio Calculator.

What Lenders Want to See

Conventional loans: ≤28% front-end, ≤36% back-end (some allow up to 45%). FHA loans: up to 43% back-end. VA loans: typically ≤41% but flexible. USDA: ≤29% front, ≤41% back.

How to Lower Your DTI Before Applying

Pay off debts: Every $100/month in eliminated debt translates to roughly $15,000-20,000 in additional mortgage borrowing capacity. Use our Debt Payoff Calculator to plan.

Pay off credit cards: Even small balances count. Our Credit Card Payoff Calculator shows how fast you can clear them.

Increase income: A raise, bonus, or side income all reduce DTI. Check your true earnings with our Salary Calculator.

Avoid new debt: Don't finance a car or open credit cards in the months before applying for a mortgage.

After You're Approved

Once you know your DTI qualifies, use our Home Affordability Calculator to find your price range, then our Mortgage Calculator for exact payments. Compare down payment scenarios and check the true cost with our APR Calculator. Read our complete guide: How Much House Can You Afford on $80K?