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Understanding Debt-to-Income (DTI) and Loan Affordability
Debt-to-income (DTI) ratio is the percentage of your gross monthly income that goes toward debt payments. Lenders use it — alongside credit score and assets — to decide how much they'll let you borrow, because it's a direct measure of how much room your budget has for a new payment.
This calculator applies the 28/36 rule (or a custom preset you choose) to your income, existing debts, and desired loan terms to estimate the maximum loan amount, purchase price, and monthly payment you could realistically qualify for.
Front-end vs back-end DTI
Lenders actually check two separate ratios, and your borrowing power is capped by whichever one is more restrictive for your situation.
- Front-end DTI: your housing payment alone (principal, interest, taxes, insurance, HOA) divided by gross income — commonly capped around 28%
- Back-end DTI: all monthly debt payments combined, including the new housing payment, divided by gross income — commonly capped around 36%
- Some loan programs allow higher back-end limits (up to 43–50%) for borrowers with strong credit or extra reserves
How to improve your DTI ratio
- Pay down or pay off high-payment debts like car loans or credit cards before applying
- Increase your down payment to reduce the loan amount and monthly payment
- Add verifiable income, such as a co-borrower or a documented side income
- Choose a longer loan term or shop for a lower interest rate to reduce the monthly payment
Example
With an $85,000 gross annual income and $500/month in existing debts, a standard 28/36 DTI limit caps the new housing payment at roughly $1,983/month (28% of income) and total debt at $2,550/month (36% of income). Since $500 is already committed, the real ceiling for the new payment is the lower of the two limits after subtracting existing debt.
+What is a good debt-to-income ratio?
Most conventional lenders prefer a back-end DTI at or below 36%, though some programs accept up to 43–50% for well-qualified borrowers. Generally, the lower your DTI, the more favorable your loan terms and the easier approval tends to be.
+What's the difference between front-end and back-end DTI?
Front-end DTI only counts your housing payment against your income. Back-end DTI counts your housing payment plus all other debt payments — car loans, student loans, credit cards, and more — against your income.
+How can I lower my DTI ratio?
Pay down existing debts, avoid taking on new debt before applying, increase your down payment, or increase your documented income. Even paying off a single small balance can meaningfully improve your ratio.
+Does my DTI ratio affect my credit score?
No, DTI isn't part of your credit score calculation directly, though high credit card balances that raise your DTI can also raise your credit utilization, which does affect your score.
+What DTI ratio do lenders typically require for a mortgage?
Conventional loans commonly cap back-end DTI around 36–45% depending on the lender and your credit profile, while government-backed loans (like FHA) sometimes allow higher ratios with compensating factors such as strong credit or cash reserves.