Complete guide
Reviewed July 2026Debt-to-income ratio (DTI) is the first number a lender computes when you apply for any loan: your total monthly debt payments divided by your gross monthly income. It answers the underwriter's core question — how much of this person's income is already spoken for?
Credit scores measure whether you repay; DTI measures whether you can. You can have an excellent score and still be declined on DTI alone, which is why checking it yourself before applying beats being surprised at the bank.
Enter your income and monthly obligations above to get your ratio instantly, then use the thresholds and strategies below to read it the way an underwriter would — and improve it before it costs you an approval or a rate.
DTI formula: front-end and back-end
Back-end DTI = Total monthly debt payments ÷ Gross monthly income × 100 Front-end DTI (housing ratio) = Housing payment only ÷ Gross monthly income × 100 India equivalent: FOIR — same math, usually against net income.
'Debt payments' means required minimums: rent or mortgage/EMI, car loans, student loans, personal loans, credit-card minimum payments (not balances), and court-ordered support. It excludes utilities, groceries, insurance premiums, subscriptions and taxes — DTI is a debt measure, not a budget.
Worked example
- Gross monthly income: $7,000 (or ₹ equivalent — the math is identical).
- Debts: mortgage payment $1,800 + car loan $450 + student loan $350 + card minimums $150 = $2,750.
- Back-end DTI = 2,750 ÷ 7,000 = 39.3%.
- Front-end DTI = 1,800 ÷ 7,000 = 25.7%.
- Reading: approvable for most loan types, but close enough to 43% that a new $400/month obligation could block the next mortgage refinance.
What lenders accept
| Loan type | Preferred | Maximum (with compensating factors) |
|---|---|---|
| Conventional mortgage (US) | ≤ 36% | 45–50% with strong credit/reserves |
| FHA mortgage | 31/43 front/back | up to ~56.9% via automated underwriting |
| VA mortgage | ≤ 41% guideline | higher with residual-income test |
| Auto loans | ≤ 45–50% | lender-specific |
| Personal loans | ≤ 40% | some to 50% at higher rates |
| Indian home loans (FOIR) | ≤ 40–50% of net income | 55%+ for high incomes |
What your number means
| Back-end DTI | Assessment |
|---|---|
| Under 20% | Excellent — debt is a rounding error; maximum flexibility |
| 20–35% | Healthy — approvable nearly everywhere at good rates |
| 36–43% | Stretched — approvals possible but pricing worsens; add nothing new |
| 44–49% | High risk — limited options, subprime pricing |
| 50%+ | Over-extended — most lenders decline; prioritize payoff or income |
How to lower your DTI
Reduce the numerator (debt payments)
- Pay off small loans entirely — eliminating a $300/month car payment cuts DTI more than paying $10,000 off a mortgage, because DTI counts payments, not balances.
- Pay credit cards below reporting minimums; card minimums count even if you pay in full monthly (lenders use the statement minimum).
- Consolidate high-payment debts into one lower-payment loan — the balance stays but the monthly obligation drops (mind the added interest from longer terms).
- Recast or refinance an existing mortgage to a lower payment before applying for the next loan.
Increase the denominator (income lenders count)
- Document everything: bonuses, overtime and side income usually count with a 1–2 year history.
- Add a co-borrower whose income outweighs their debts.
- Rental income typically counts at ~75% of lease value with documentation.
- For the self-employed: DTI uses taxable income after deductions — aggressive write-offs lower the income lenders see. Plan two years ahead of a big application.
Using this calculator
- Enter gross monthly income (before tax) from all documentable sources — use net income instead if you're checking against Indian FOIR norms.
- Add every required monthly debt payment: housing, vehicle, student, personal loans, card minimums, support obligations.
- Read both your ratio and the assessment band.
- Planning a loan? Add its projected payment to your debts and re-run — that post-loan DTI is the number underwriting will actually judge.
Common mistakes
- Using take-home pay against US-style thresholds (they assume gross) — or gross income against Indian FOIR norms (which assume net).
- Counting card balances instead of minimum payments, or omitting cards because 'I pay in full'.
- Including utilities, insurance and subscriptions — they don't belong in DTI.
- Forgetting the new loan's own payment when checking eligibility for it.
- Treating 43% as a target rather than a ceiling — the comfortable life happens under 36%.
Frequently asked questions
Glossary
- DTI
- Debt-to-income ratio — monthly debt payments ÷ gross monthly income.
- Front-end ratio
- Housing payment alone ÷ income; the '28–31%' rule.
- Back-end ratio
- All debt payments ÷ income; the decisive underwriting number.
- FOIR
- India's version — fixed obligations ÷ net income, capped ~40–55% by banks.
- Compensating factors
- Strengths (reserves, credit, down payment) that let lenders approve above-guideline DTI.
- Residual income
- VA underwriting's alternative test: income left after debts and living costs.
- Credit utilization
- Card balances ÷ limits — affects credit score; distinct from DTI.
- Imputed payment
- The assumed monthly payment underwriters assign to deferred debts (e.g., 0.5–1% of student-loan balance).
Key takeaways
DTI = required monthly debt payments ÷ gross income, judged against ~36% (comfortable) and ~43–50% (program ceilings). It counts payments, not balances — so the fastest improvements come from eliminating whole payments and timing new obligations after, not before, big applications. Check your post-loan DTI before the lender does, and treat 36% as the line for a life with slack in it.
Enter your income and payments above, then add the loan you're planning and re-run — the post-loan number is the one underwriting will see.