Home › Guides › Debt-to-Income Ratio Explained
LoansYour credit score tells lenders your history. Your debt-to-income ratio (DTI) tells them your capacity — how much of your income is already spoken for by debt. It can make or break a mortgage application even with a perfect score.
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The formula
DTI = (Total monthly debt payments ÷ Gross monthly income) × 100
— lenders use pre-tax income —
— lenders use pre-tax income —
Example: you earn $6,000/month gross. Debts: mortgage $1,400 + car loan $350 + student loan $250 + card minimums $100 = $2,100. DTI = 2,100 ÷ 6,000 = 35% — in the healthy range.
Front-end vs back-end DTI
| Type | What it includes | Typical lender cap |
|---|---|---|
| Front-end (housing ratio) | Housing costs only: mortgage/rent + taxes + insurance | ~28% |
| Back-end (total DTI) | All minimum debt payments | ~43–45% |
Both must pass. You can be fine on total DTI and still fail if housing alone eats 40% of income — that's why knowing how much house you can afford starts with these ratios.
What your DTI says
| DTI | Meaning |
|---|---|
| Below 20% | Excellent — lots of room to borrow if needed |
| 20–36% | Healthy — the sweet spot most lenders love |
| 36–43% | Tightening — manageable, but little margin |
| Above 43–50% | Danger zone — denials and high rates likely |
How to lower your DTI
- Kill small debts entirely. Eliminating a $200/month payment drops the numerator — lenders count minimum payments, not balances.
- Avoid new debt before big applications. No new cars or cards in the months before a mortgage application.
- Raise documented income. A raise, a second earner's income, or qualifying side income lowers the ratio from the denominator.
- Run your own number on net income. Lenders use gross; you live on net. A 43% gross DTI can be 60%+ of take-home — judge your comfort by the net figure.
Frequently asked questions
Below 36% total DTI is considered healthy by most lenders; 36–43% is acceptable but tightening; above 43–50% (depending on the loan program) usually means denial or higher rates. For mortgages specifically, many conventional lenders cap back-end DTI around 43–45%. Lower is always better — it means more breathing room.
Lenders use gross (pre-tax) monthly income — your salary divided by 12, before any deductions. That's important: a 40% DTI on gross income is a much bigger bite of your actual take-home pay. When judging your own comfort, run the number on net income too.
Minimum required monthly payments on mortgages/rent, car loans, student loans, personal loans, and credit card minimums, plus any alimony or child support. Everyday living costs like groceries, utilities, and insurance don't count — DTI only measures contractual debt obligations.
Pay off small debts entirely (eliminating a payment removes it from the numerator), avoid new borrowing before applying for a mortgage, and increase documented income. Paying down a credit card balance helps less than killing a whole installment loan, because lenders use the minimum payment — not the balance.
Disclaimer: Calculator content is for education and planning only — not financial advice. Loan terms, rates, fees and tax rules vary by lender and country; confirm important figures with your lender or a licensed financial adviser before deciding.