How to Calculate Your Debt-to-Income Ratio
Debt-to-income ratio is monthly debt payments divided by gross monthly income. What counts, how to calculate front-end and back-end DTI, and mortgage limits.
The short version
- DTI = total monthly debt payments ÷ gross (pre-tax) monthly income × 100.
- Count minimum payments on loans and cards, plus rent or your future mortgage payment — not utilities, groceries, or insurance.
- Front-end DTI counts only housing; back-end DTI counts all debts. Lenders care most about back-end.
- Under 36% is generally considered good; many mortgages allow 43% to 50% with strong credit or savings.
- Paying down a card or car loan lowers DTI faster than almost anything else.
Your debt-to-income ratio (DTI) is one of the first numbers a lender looks at when you apply for a mortgage, car loan, or personal loan. It measures how much of your income is already committed to debt payments, which tells the lender how much room you have for a new one. The good news: it takes about two minutes to calculate yourself.
The debt-to-income formula
DTI = (total monthly debt payments ÷ gross monthly income) × 100. Gross income is what you earn before taxes and deductions; if you’re salaried, divide your annual salary by 12. Use the minimum required payment on each debt, not what you choose to pay.
| Monthly payment | Amount |
|---|---|
| New mortgage payment (principal, interest, taxes, insurance) | $1,500 |
| Car loan | $400 |
| Student loan | $250 |
| Credit card minimums | $100 |
| Total debt payments | $2,250 |
| Back-end DTI ($2,250 ÷ $6,000) | 37.5% |
| Front-end DTI (housing only, $1,500 ÷ $6,000) | 25% |
What counts as debt (and what doesn’t)
| Included | Not included |
|---|---|
| Rent, or the new mortgage payment you’re applying for | Utilities, phone, internet |
| Car loans and leases | Groceries, gas, entertainment |
| Student loans (even if deferred, lenders use a payment) | Health, car, and life insurance premiums |
| Credit card minimum payments | Taxes withheld from your paycheck |
| Personal loans, buy-now-pay-later plans | Retirement contributions |
| Child support and alimony you pay | 401(k) loans (often excluded) |
If you’re renting now and applying for a mortgage, lenders replace your rent with the proposed mortgage payment — including property taxes, homeowners insurance, mortgage insurance, and HOA dues — so estimate that carefully with the mortgage calculator.
Front-end vs. back-end DTI
The front-end ratio (or housing ratio) counts only your housing payment. The back-end ratio counts every debt, including housing. The classic guideline is the 28/36 rule: housing under 28% of gross income and total debt under 36%. Most lenders focus on the back-end number.
What DTI do lenders allow?
| Loan type | Typical limit | Notes |
|---|---|---|
| Conventional (Fannie Mae / Freddie Mac) | 36%–45%; up to 50% | Up to 50% through automated underwriting with strong compensating factors |
| FHA | 31% front / 43% back | Can go higher with compensating factors through automated approval |
| VA | 41% | A guideline, not a cap; VA also requires enough residual income after bills |
| USDA | 29% front / 41% back | Higher ratios possible with compensating factors |
| Personal loans and auto loans | Often under 36%–50% | Varies by lender |
Approved isn’t the same as comfortable
A 45% DTI means nearly half your gross pay — and more than half your take-home pay — goes to debt before groceries, savings, or emergencies. Many people find 36% or less far easier to live with.
How to lower your DTI quickly
- Pay off a small debt completely — eliminating a $150 minimum lowers DTI more than paying $150 extra on a big balance.
- Pay credit cards down: their minimums usually shrink with the balance.
- Avoid new credit (including a new car) in the months before a mortgage application.
- Add a co-borrower’s income, if it’s a shared purchase.
- Refinance or consolidate high-payment debt into a longer, lower-payment loan — weighing the extra interest.
See how much each payoff would move your ratio with the debt-to-income calculator, and what home price fits your numbers with the home affordability calculator.
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Frequently Asked Questions
How do you calculate debt-to-income ratio?
Add up your monthly debt payments — rent or mortgage, car loan, student loans, credit card minimums, and other loans — and divide by your gross monthly income. Multiply by 100 for a percentage. $2,250 of payments on $6,000 of monthly income is a 37.5% DTI.
What is a good debt-to-income ratio?
Under 36% is generally considered good, with no more than 28% going to housing. Lenders often approve mortgages up to 43% to 50% with strong credit and savings, but lower is more comfortable.
Is DTI based on gross or net income?
Gross income — what you earn before taxes and deductions. That’s why a 40% DTI takes up far more than 40% of your take-home pay.
Does rent count in debt-to-income ratio?
Yes, for most loans other than a mortgage. When you apply for a mortgage, lenders use your proposed new housing payment instead of your current rent.
Sources
This article is for general education and is not financial, tax, or legal advice. Figures reflect published IRS and SSA amounts as of the date above; verify current limits with the linked sources or a qualified professional before acting.
About the author
David Miles is the founder of FigureMoney and builds independent, source-backed personal-finance tools across the Modern Site Builders network. Every calculator and guide cites the IRS, SSA, or primary research behind its numbers.
Calculators in this guide
Debt-to-Income Ratio Calculator
Calculate your debt-to-income (DTI) ratio from your monthly debt payments and gross income — the number lenders use to approve a mortgage or loan.
Home Affordability Calculator
Find out how much house you can afford. Enter your income, debts, and down payment to see your target home price and monthly payment, using the 28/36 rule.
Debt Payoff Calculator
Compare the debt snowball and avalanche methods across all your debts. See which clears your balances faster and which saves the most interest.
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