Debt-to-Income Ratio (DTI)
Debt-to-income ratio is the single number lenders use to decide how much you can borrow. Learn how front-end and back-end DTI are calculated, what limits apply, and how to improve your ratio before applying.
Definition
Debt-to-income ratio (DTI) is your total monthly debt obligations divided by your gross monthly income, expressed as a percentage. Lenders use it to measure how much of your income is already committed to debt before adding a mortgage payment.
DTI = Total monthly debt payments ÷ Gross monthly income × 100
Front-end vs back-end DTI
Lenders calculate two versions of DTI, though back-end DTI is the binding constraint for most borrowers:
Front-end DTI (housing ratio)
Proposed housing payment (PITI) ÷ gross monthly income. Most conventional guidelines target under 28%. FHA guideline: 31%.
Example: $2,000 PITI ÷ $8,000 income = 25% front-end DTI
Back-end DTI (total debt ratio)
All monthly debt payments including housing ÷ gross income. Conventional target: 43–45%. FHA allows up to 57% with compensating factors.
Example: ($2,000 PITI + $600 other debts) ÷ $8,000 = 32.5% back-end DTI
DTI limits by loan type
| Loan type | Standard max DTI | With compensating factors |
|---|---|---|
| Conventional (Fannie/Freddie) | 43–45% | Up to 50% |
| FHA | 43% | Up to 57% |
| VA | 41% (soft) | No hard cap |
| USDA | 41% | Up to 44% |
| Jumbo | 43% | Rarely exceeded |
What counts toward DTI — and what does not
Lenders pull your credit report and use the minimum monthly payment for each obligation. Common inclusions and exclusions:
Counted in DTI
- Proposed mortgage payment (PITI + HOA)
- Car loans
- Student loan payments (or imputed payment)
- Credit card minimum payments
- Personal loans
- Child support / alimony (required by court order)
Not counted in DTI
- Utilities (electricity, gas, water)
- Insurance premiums (car, health)
- Subscriptions and living expenses
- Groceries and transportation costs
- Accounts not on your credit report
How to improve your DTI
- Pay down revolving debt first. Credit card balances with high minimum payments have an outsized effect on DTI relative to their balance. Paying off a card with a $200/month minimum immediately removes $200 from your monthly debt load.
- Eliminate small installment loans. A car loan with 10 months remaining at $350/month adds $350 to your DTI calculation. Paying it off before applying removes that entirely.
- Document all income sources. Rental income, side work (with a 2-year history), and investment distributions can all be counted. More documented income lowers DTI by raising the denominator.
- Avoid new debt before closing. Every new credit account — car loan, personal loan, new credit card — is counted in DTI and can push you over the limit even after pre-approval. Do not take on new debt between pre-approval and closing.
Common questions
What DTI ratio do I need to qualify for a mortgage?
For conventional loans, Fannie Mae's Desktop Underwriter generally allows a maximum back-end DTI of 45–50% with compensating factors (strong credit score, reserves). The standard guideline is 43% back-end DTI. FHA loans allow up to 57% DTI in some cases. VA loans have no hard DTI cap but lenders typically apply 41% as a soft limit. Jumbo loans are strictest — most lenders cap at 43% DTI regardless of other factors.
What counts as debt in DTI?
DTI includes all monthly minimum debt obligations that appear on your credit report: mortgage payment (PITI — principal, interest, taxes, insurance), car loans, student loans, credit card minimum payments, personal loans, and other installment debts. It does NOT include utilities, subscriptions, groceries, or other living expenses. Student loans in deferment or income-based repayment are included at a calculated payment (typically 0.5–1% of the outstanding balance per month if the actual payment is $0).
How is front-end DTI different from back-end DTI?
Front-end DTI (also called the housing ratio) is your proposed housing payment divided by gross monthly income. Back-end DTI is all monthly debt payments including housing divided by gross income. Most lenders focus on back-end DTI. Conventional loans typically want front-end DTI under 28% and back-end under 36–45%. FHA guidelines are 31% front-end and 43% back-end (with exceptions up to 57%). The CFPB DTI explainer covers both ratios.
Can I get a mortgage with 50% DTI?
Possibly, with the right loan type and compensating factors. FHA loans and some conventional loans approved through automated underwriting allow DTI up to 50–57% for borrowers with strong credit scores (720+), large reserves (6–12 months of payments in savings), and low LTV. However, a 50% DTI leaves very little financial cushion — and lenders know it. You may face higher rates and more conditions at that level.
How do I lower my DTI before applying?
Three levers: pay down existing debt (especially credit cards and car loans that have high minimum payments relative to balance), increase gross income (a documented raise, second job, or rental income that has a 2-year history can be counted), or apply for a smaller loan (lower purchase price or larger down payment). Avoid opening new credit accounts or taking on new debt in the 6–12 months before applying — each new obligation raises your back-end DTI.