Your debt-to-income ratio (DTI) is the share of your gross monthly income that goes to monthly debt payments, including your new mortgage payment. Lenders use it to judge whether you can comfortably take on the loan, and each loan type has its own limits.
Your credit score and down payment matter, but DTI often decides how much home you can qualify for. Knowing your number before you shop is one of the easiest ways to avoid surprises.
Key takeaways
- DTI = monthly debts ÷ gross monthly income. Gross means before taxes.
- There are two ratios. The front-end ratio is just housing; the back-end ratio is housing plus all other debts.
- Limits depend on the loan. Many conventional loans allow up to about 50% back-end DTI with automated approval; FHA, VA and USDA each have their own guidelines.
- Only debts on your credit report and certain obligations count. Utilities, phone bills and groceries don’t.
- Small changes can help. Paying down the right debt before you apply can lower your DTI more than you’d expect.
What is a debt-to-income ratio?
DTI compares what you earn each month with what you already owe each month. Lenders look at two versions:
- Front-end ratio: your new housing payment (principal, interest, taxes, insurance, mortgage insurance and any HOA dues) divided by gross monthly income
- Back-end ratio: your housing payment plus all other monthly debts, divided by gross monthly income
When people say “DTI,” they usually mean the back-end ratio.
How is DTI calculated?
Add up your monthly debt payments, divide by your gross monthly income, and multiply by 100.
Example
Say you earn $6,000 a month before taxes. Your monthly debts are:
- Car loan: $400
- Student loan: $250
- Credit card minimum payments: $150
- Estimated new housing payment: $1,500
Total monthly debt is $2,300. $2,300 ÷ $6,000 = 38.3% back-end DTI. Your front-end ratio is $1,500 ÷ $6,000 = 25%.
What counts as debt in a DTI calculation?
Lenders count recurring obligations, mostly from your credit report:
- Your new housing payment
- Car loans and leases
- Student loans (if your payment is $0 on an income-driven plan, some loan types use a percentage of the balance instead)
- Minimum credit card payments
- Personal loans
- Child support and alimony
- Loans you co-signed, in most cases
They don’t count utilities, cell phone bills, car insurance, groceries or childcare.
What is a good DTI for a mortgage?
Lower is better, but “good” depends on the loan type. As general guidelines:
Lenders also weigh your credit score, cash reserves, employment history and down payment, so two borrowers with the same DTI can get different answers.
Why does DTI matter?
DTI shows a lender whether your income can handle your current debts plus a new mortgage. It mostly affects whether you qualify and how much you can borrow. Your rate is driven more by credit score, down payment and loan type.
A lower DTI can help you:
- Qualify for more loan programs
- Increase how much you can borrow
- Keep breathing room in your monthly budget
How can you lower your DTI before applying?
If your DTI is higher than you’d like, try these before you apply:
- Pay down credit cards. Lower balances usually mean lower minimum payments.
- Target payments, not just balances. Paying off a small loan with a big monthly payment can help more than chipping at a large one.
- Hold off on new debt. Don’t finance a car or furniture while you’re house hunting.
- Document all your income. Bonuses, overtime and side income may count with enough history.
- Ask before you pay anything off. Some debts can be excluded or handled differently, so a quick review can save you cash.
Don’t pay anything off until you call me
The most common mistake I see? Someone gets excited, drains their savings to pay down a big credit card balance, and it barely moves their DTI. Meanwhile, the small car loan with the $450 payment was the one that mattered. Lenders count the monthly payment, not the balance.
And please, please don’t buy a new car or new furniture while you’re house hunting. New debt can shrink your approval or derail a closing right before the finish line. 😩
Pro tip: some debts can be paid down, paid off or even left out of the math in ways that help you qualify for more. A five-minute review before you move any money can be the difference between a yes and a no.
Bottom line: know your number first
Your DTI is one of the clearest signals of how much home you can afford. Run your numbers, see where you stand, and give yourself time to make changes before you apply. Blue Arrow Lending can review your income and debts and show you how different loan types treat them.
Frequently Asked Questions
It depends on the loan. Many conventional loans allow up to about 50% with automated approval, FHA loans can sometimes go higher with a strong file, and VA loans add a residual-income test. Your lender’s automated underwriting decision sets the final limit.
Gross income, meaning your income before taxes and other deductions. Self-employed borrowers generally use the income shown on their tax returns after business expenses.
No. DTI counts recurring debts such as housing, car loans, student loans, credit card minimums, personal loans, and child support or alimony. Utilities, phone bills, insurance and groceries are not included.
Yes, if it lowers or eliminates the minimum payment on your credit report. Ask a loan officer before paying anything off, since the cash may be needed for your down payment or closing costs.
Broker/Owner of Blue Arrow Lending with 13 years of experience originating mortgages. Jenn helps borrowers in Colorado, Florida, Texas, and Wyoming understand what they qualify for before they shop.
This article is for general educational purposes only and is not a commitment to lend. Loan program requirements, down payment minimums, and mortgage insurance rules are general guidelines and are subject to change. All loans are subject to credit approval, underwriting, and property eligibility. Blue Arrow Lending, NMLS# 2046633. Jenn Moretti, NMLS# 573143. Licensed in Colorado, Florida, Texas, and Wyoming. Equal Housing Opportunity.