Debt-to-Income Ratio (DTI) Explained: How to Calculate It and What Lenders Want
Your debt-to-income ratio is the mortgage world's way of asking, "How full is your plate already?" Here is how to calculate it in two minutes and what lenders like to see.
- What it is: your debt-to-income ratio (DTI) is your monthly debt payments divided by your gross (pre-tax) monthly income.
- Two versions: front-end DTI counts only housing costs; back-end DTI counts housing plus all other monthly debts.
- Typical limits: up to 50% for many conventional loans approved by Fannie Mae’s automated system; FHA uses 31% and 43% benchmarks with flexibility; USDA uses 29% and 41%; VA uses a 41% guideline plus a residual income test.
- Lower is easier: a lower DTI usually means an easier approval and a less stressful budget.
Imagine your monthly income is a dinner plate. Your car loan, student loans and credit cards are already sitting on it. A mortgage lender wants to know how much room is left before the plate overflows. That, in a nutshell, is your debt-to-income ratio.
It is one of the most important numbers in a mortgage application, and you can calculate it yourself in about two minutes.
How to calculate your DTI
The formula is simple:
DTI = total monthly debt payments / gross monthly income x 100
“Gross” means before taxes and deductions. If you earn $84,000 a year, your gross monthly income is $7,000.
What counts as debt
- Your new mortgage payment, including property taxes, homeowners insurance, mortgage insurance and any HOA dues
- Car loans and leases
- Student loans
- Minimum credit card payments (not the full balance)
- Personal loans
- Child support and alimony you pay
- Payments on other properties you own
What usually does not count
- Utilities, phone and internet bills
- Groceries, gas and streaming subscriptions
- Car insurance and health insurance
Front-end vs back-end DTI
| Ratio | What it includes | Also called |
|---|---|---|
| Front-end DTI | Housing payment only (principal, interest, taxes, insurance, HOA, mortgage insurance) | Housing ratio |
| Back-end DTI | Housing payment plus all other monthly debts | Total debt ratio |
When people say “DTI” without specifying, they usually mean back-end DTI. That is the one most lenders focus on.
Sam earns $7,000 a month before taxes. Sam’s debts are a $450 car payment, a $300 student loan and a $100 minimum credit card payment. The new housing payment would be $1,900.
- Front-end DTI: $1,900 / $7,000 = 27.1%
- Back-end DTI: ($1,900 + $450 + $300 + $100) / $7,000 = $2,750 / $7,000 = 39.3%
Flip it around: with $850 in other debts, a 43% back-end limit leaves room for up to $3,010 – $850 = $2,160 in housing costs. At 36%, it is $2,520 – $850 = $1,670.
Want to see how that housing budget translates to a home price? Use our home affordability calculator, then fine-tune the payment with the mortgage calculator.
DTI limits by loan type
| Loan type | Typical DTI guideline | Notes |
|---|---|---|
| Conventional (Fannie Mae) | Up to 50% with Desktop Underwriter approval | Manual underwriting: 36%, up to 45% with strong credit and reserves |
| FHA | 31% housing / 43% total benchmarks | Higher ratios possible with compensating factors or automated approval |
| VA | 41% guideline | Also uses a residual income test; higher ratios can be approved |
| USDA | 29% housing / 41% total | Flexibility with compensating factors |
Lenders can also set stricter limits of their own. For loan-specific details, see our guides to FHA loan requirements and VA loan requirements.
VA’s second test: residual income
VA loans add a twist. Besides DTI, VA lenders check your residual income, which is the money left over each month after your major expenses, including the new housing payment, debts, taxes and estimated maintenance and utilities. VA publishes minimum residual income amounts that depend on family size, loan amount and region of the country.
This is a big reason VA loans can sometimes be approved with a DTI above 41%: if you have plenty of money left over each month, the higher ratio is less worrying.
DTI vs credit score: which matters more?
Both matter, but they measure different things. Your credit score shows how you have handled debt in the past. Your DTI shows how much room you have for new debt today. A great score will not rescue a DTI that is far over the limit, and a tiny DTI will not fully make up for a rocky credit history. Lenders look at the whole picture, including your savings and job history.
What is a “good” DTI?
There is no single magic number, but here is a useful way to think about it:
- Below about 36%: comfortable territory for most lenders and most budgets.
- 36% to 43%: commonly approved, but your budget gets tighter.
- Above 43%: possible with certain programs and strong compensating factors, but the room for surprises shrinks.
Comfort is personal. If you have big childcare costs or want to save aggressively, aim lower than the maximum a lender allows. Our guide on how much house you can afford on $100K walks through this kind of thinking.
How to lower your DTI
- Pay off small debts. Wiping out a $100-a-month payment drops it from the calculation entirely.
- Pay down credit cards. Lower balances can mean lower minimum payments and may help your credit score.
- Avoid new debt. A new car payment right before applying is a classic DTI killer.
- Increase documented income. A raise, a co-borrower or a steady side income with enough history can help, as long as the lender can verify it.
- Adjust the house budget. A smaller loan, larger down payment or lower-tax area all shrink the housing payment.
Common DTI mix-ups
- Using take-home pay. Lenders use gross income, so your ratio may look better on their worksheet than in your bank account.
- Forgetting taxes and insurance. Your housing payment includes escrow, not just principal and interest. Our escrow guide explains why.
- Ignoring deferred student loans. Many programs still count a payment for them even if you are not paying right now. Rules vary by loan type.
Try it: use our DTI calculator to get your front-end and back-end ratio in seconds.
FAQ
Is DTI based on gross or net income?
Gross income, meaning before taxes and deductions.
Does rent count in my DTI for a mortgage?
Your current rent is replaced by the new mortgage payment in the calculation if you are moving out, so it is not counted on top.
Can I get a mortgage with a 50% DTI?
Possibly. Fannie Mae allows up to 50% with automated approval, and FHA and VA can go higher in some cases. Expect closer scrutiny.
Do utilities count toward DTI?
No. Utilities, phone bills and groceries are not part of DTI, but they still belong in your personal budget.
Does paying off a credit card lower DTI?
Yes, if it eliminates or reduces the minimum payment the lender counts.
Keys & Coffee is an independent education site and is not a lender. Examples are for illustration only. Sources: Consumer Financial Protection Bureau (debt-to-income ratio and Qualified Mortgage rule), Fannie Mae Selling Guide, U.S. Department of Housing and Urban Development (FHA Single Family Housing Policy Handbook), U.S. Department of Veterans Affairs, USDA Rural Development.
Keys & Coffee is an independent education site. We are not a lender or mortgage broker, we do not take loan applications or payments, and nothing here is financial advice. This site is not affiliated with Axia Home Loans, Axia Financial, LLC, or Planet Home Lending. Rates and rules change often — always confirm details with a licensed loan officer and check any lender on the NMLS Consumer Access site.
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