Your debt-to-income ratio (DTI) is one of the two most important numbers in personal finance — alongside credit score. Lenders use it to approve or decline loan applications. You should use it to assess whether your debt load is sustainable and how much more you can borrow responsibly.
Quick Answer
DTI = Total Monthly Debt Payments ÷ Gross Monthly Income. Below 36% is the target. Below 28% puts you in the best position for loan approvals and rates. Above 43%, most lenders become restrictive. To improve your DTI: pay off smaller loans (eliminates the monthly payment entirely), increase income, or avoid taking on new debt. Use the Loan Calculator to model how a new loan would affect your DTI before you apply.
How to Calculate Your DTI
Step 1: Total all monthly debt payments
Include:
- Mortgage or rent payment
- Car loan payment(s)
- Student loan payment(s)
- Personal loan payment(s)
- Minimum credit card payment(s)
- Any other regular loan obligations
Do NOT include: utilities, groceries, subscriptions, insurance, phone bill. These are expenses, not debt service.
Step 2: Find your gross monthly income
Use pre-tax income. Annual salary ÷ 12. Include regular overtime, rental income, or freelance income only if consistent (typically 2+ years of documented history).
Step 3: Divide
DTI = Monthly Debt Payments ÷ Gross Monthly Income × 100
Example:
-
Rent: $1,200
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Car payment: $380
-
Student loan: $250
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Credit card minimums: $120
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Total debt payments: $1,950
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Annual salary: $72,000 → Monthly gross: $6,000
-
DTI = $1,950 ÷ $6,000 = 32.5% ✓ (Below 36% — good)
DTI Benchmarks
| DTI | What It Means |
|---|---|
| Below 20% | Excellent — very low debt burden, easy approval |
| 20–28% | Very good — comfortable margin for new borrowing |
| 28–36% | Good — within standard lender guidelines |
| 36–43% | Caution zone — qualifies for most loans but rates may be less favorable |
| 43–50% | High — many lenders decline; requires strong compensating factors |
| Above 50% | Very high — most conventional lenders won’t approve new credit |
Most mortgage lenders use two DTI thresholds:
- Front-end DTI: housing costs only ÷ gross income — target below 28%
- Back-end DTI: all debt payments ÷ gross income — target below 36%, maximum ~43%
How New Loans Affect Your DTI
Before applying for any loan, calculate how it changes your DTI:
Current situation: $1,950 monthly debt, $6,000 monthly income = 32.5% DTI
New auto loan at $450/month: ($1,950 + $450) ÷ $6,000 = 40% DTI
That crosses from “good” into the “caution zone.” If you simultaneously have a mortgage application coming up, this matters significantly.
Use the Loan Calculator to find the monthly payment of any loan you’re considering — then add it to your current debt payments and divide by your gross income to see the resulting DTI.
How to Improve Your DTI
Strategy 1: Pay off smaller loans entirely Eliminating a $250/month student loan or $200/month personal loan immediately reduces your DTI. If your DTI is 42% and you pay off a $200/month loan: ($1,950 − $200) ÷ $6,000 = 29.2%. From caution zone to very good — by eliminating one payment.
Target the smallest loan by balance (not rate) if the goal is DTI improvement quickly. This is the one case where the snowball method beats avalanche: eliminating a payment has an immediate DTI impact.
Strategy 2: Increase income The denominator matters as much as the numerator. Adding $500/month in documented income: $1,950 ÷ $6,500 = 30% DTI. A part-time job, freelance income, or a raise can improve DTI without paying down any debt.
Strategy 3: Avoid new debt before a major loan application If you’re planning to apply for a mortgage in 6 months, don’t take out a car loan or personal loan in the interim. Each new obligation increases your DTI and may change your mortgage qualification.
Strategy 4: Pay down credit card balances Minimum payment on a $5,000 credit card at 22% APR is approximately $125/month. Paying it off eliminates $125/month in debt obligations — and also dramatically improves your credit utilisation ratio (separate from DTI, but equally important for loan approval).
DTI vs Credit Utilisation
These are related but different metrics:
- DTI: monthly debt payments ÷ gross monthly income — used by lenders for loan qualification
- Credit utilisation: revolving balance ÷ credit limit — used in credit scoring models
Improving one often improves the other, but they’re optimised differently. For loan qualification, focus on DTI. For credit score, focus on utilisation (keep revolving balances below 30% of limits, ideally below 10%).
A well-managed DTI and credit score work together — lenders use both when setting the rate you qualify for.