What Is Debt-to-Income Ratio (DTI)?
Quick Answers
Max DTI (QM loan)
43% typical
Ideal DTI
Under 36%
Housing DTI max
28% recommended
Formula
Monthly debt / gross income
Your debt-to-income ratio is the percentage of your gross monthly income that goes toward debt payments -- one of the most important numbers lenders use to evaluate loan applications.
Lenders use your debt-to-income ratio (DTI) to measure how much of your income is already committed to existing debt obligations. A low DTI signals that you have enough income relative to your debts to comfortably take on a new loan. A high DTI suggests you may be stretched thin and could struggle to make additional payments.
DTI is calculated by dividing your total monthly debt payments by your gross monthly income (before taxes). The result is expressed as a percentage. Most conventional mortgage lenders want to see a DTI of 43% or lower, though some loan programs allow up to 50%.
Key Facts About DTI
- Front-end DTI: Only housing costs (mortgage/rent + taxes + insurance) divided by gross income. Lenders typically want this below 28%.
- Back-end DTI: All monthly debt payments (housing + car loans + student loans + credit cards) divided by gross income. Most lenders cap this at 43%.
- What counts as debt: Minimum credit card payments, auto loans, student loans, personal loans, child support, and the proposed new mortgage payment.
- What doesn't count: Utilities, groceries, insurance premiums, and subscriptions are not included in DTI calculations.
- How to improve it: Pay down existing debts, increase income, or avoid taking on new debt before applying for a loan.
How to Calculate DTI
DTI = (Total Monthly Debt Payments / Gross Monthly Income) x 100
Example: $2,100 debt / $6,500 income x 100 = 32.3% DTI
Add up all your minimum monthly debt payments: proposed mortgage payment, car loan, student loan minimums, and minimum credit card payments. Divide that total by your gross monthly income (before taxes and deductions). A result under 36% is considered excellent; 3643% is acceptable for most loans; above 43% may limit your options.
DTI Example: How Existing Debt Shrinks Your Buying Power
Income: $6,500/mo. Max DTI 43%: $6,500 x 43% = $2,795/mo total debt allowed.
With $800/mo in existing debt: max new mortgage payment = $1,995/mo -- supports about a $307,600 loan at 6.75%/30yr
With only $400/mo in existing debt: max mortgage payment = $2,395/mo -- supports about a $369,300 loan
Paying off $400/mo of other debt buys roughly $61,700 more home, at the same income and DTI limit
Common DTI Mistakes
- Using net (take-home) income instead of gross: DTI is always calculated on gross monthly income, before taxes and deductions. Using your paycheck amount will understate your real DTI and can lead to a nasty surprise during underwriting.
- Forgetting the new mortgage payment counts too: DTI isn't just your existing debts -- it includes the loan you're applying for. Many first-time buyers calculate DTI on current debts alone and are surprised when the proposed payment pushes them over the limit.
Frequently Asked Questions
What DTI do I need to qualify for a mortgage?+
Most conventional loans require a back-end DTI of 43% or lower. FHA loans may allow up to 50% with compensating factors. VA and USDA loans have flexible DTI guidelines but still prefer borrowers under 41%.
Does my DTI affect my interest rate?+
Yes indirectly. A high DTI can limit you to certain loan programs or lenders, some of which charge higher rates. A lower DTI, combined with a strong credit score, gives you access to the most competitive rates.
Can I get a loan with a 50% DTI?+
It's possible with FHA loans or certain portfolio lenders, but options become limited and you may face higher rates or stricter requirements. The best strategy is to reduce debt before applying.
Does my DTI include my spouse's debt?+
If you're applying jointly, the lender uses combined income and combined debt for both applicants. If applying individually, only your income and debt are counted.
How quickly can I lower my DTI?+
The fastest ways are paying off small balances entirely (which removes that monthly payment from your DTI) or paying down revolving credit card debt. Increasing income also helps but takes longer to document.
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About the Author: De Van Do
De Van Do is the author and site builder behind MyLoanCalcs.com. With a background in technology, De Van Do built this site out of an interest in making financial calculations clear and accessible. De Van Do is not a licensed loan officer, mortgage broker, or financial advisor -- content on this site is for informational purposes only.