Jennifer WalshYour debt-to-income ratio — or DTI — is one of the most important numbers a mortgage lender looks at. It’s a simple formula: divide your total monthly debt payments by your gross monthly income. But there are actually two versions lenders care about, and they each tell a different part of your financial story.
The front-end ratio (housing DTI) looks only at your proposed mortgage payment — principal, interest, taxes, and insurance — as a share of your income. Conventional lenders typically want this below 28%. The back-end ratio (total DTI) includes all your monthly debt obligations: the mortgage plus car loans, student loans, credit card minimums, and anything else. Most conventional lenders cap this at 43%, though FHA loans allow up to 57% in some cases.
Use the calculator below to check both ratios instantly. Toggle between annual and monthly income entry, fill in your existing debts, and add your expected new mortgage payment to see exactly where you’d land.
How Lenders Use Your DTI
Different loan programs have different DTI limits, and your lender will look at both ratios together:
| Loan Type | Front-End Max | Back-End Max |
|---|---|---|
| Conventional | 28% | 43% |
| FHA | 31% | 57% |
| VA | No limit | 41% (guideline) |
| Jumbo | 28% | 43% |
These are guidelines, not hard cutoffs. A borrower with a 760 credit score and six months of cash reserves might get approved above these thresholds. A borrower near the limit with a thin credit file might not.
How to Lower Your DTI Before Applying
Pay off high-balance revolving debt first. Credit card balances raise your minimum payments and signal risk to lenders. Paying them down improves your DTI immediately.
Avoid taking on new debt before closing. Even financing a small purchase like furniture can add a monthly obligation that tips your DTI over a lender’s limit.
Increase your income. Side income, a raise, or adding a co-borrower can raise the denominator of your DTI and make the same debt load look much healthier.
Consider paying off smaller installment loans. If you’re close to the payoff on an auto loan or personal loan, finishing it before you apply for a mortgage eliminates that monthly payment from your DTI calculation.
Most mortgage underwriters want to see your DTI trending in the right direction. Even if you’re slightly above a threshold today, a few months of deliberate debt reduction can put you in a much stronger position when you apply.
DTI calculations shown are estimates based on the inputs you provide. Lenders may use different formulas, include additional obligations, or apply compensating factors. Consult a licensed mortgage professional for a complete eligibility assessment.