What Is a Good Debt-to-Income Ratio for Buying a House?

The $340,000 Pre-Approval

He called me, baffled. "I make six figures. Why are they acting like I can barely afford a starter home?"

The answer took about five minutes to find. It wasn't his income. It was his debt. Between a car payment, student loans, and a credit card balance he'd been chipping away at, nearly $1,800 of his monthly income was already spoken for before he even applied for a mortgage.

That's DTI — debt-to-income ratio. And it's the number that explains why two people with the exact same salary can get wildly different loan offers.

What DTI Actually Is

DTI is all your monthly debt payments divided by your gross monthly income — the official definition from the CFPB. Lenders use it to figure out how much room you have left for a mortgage payment after your existing obligations are covered.

Here's how the math plays out in real life. If you make $8,000 a month before taxes, and you pay $400 for a car loan, $300 for student loans, and $200 in credit card minimums, your total monthly debt is $900. That's about 11% of your income. That's your current DTI.

But when you apply for a mortgage, the lender doesn't just look at your current debts. They add the proposed mortgage payment — principal, interest, taxes, insurance — to the pile. If that mortgage payment would be $2,500, your total monthly obligations jump to $3,400. Now you're at 42.5% DTI.

The Two Numbers Lenders Actually Track

There are two versions of DTI, and they get confused all the time.

Front-end DTI only looks at housing costs. That's your future mortgage payment, property taxes, insurance, and PMI if it applies, divided by your income. Lenders typically want this under 28%.

Back-end DTI is the one that really matters. That's housing plus everything else — car loans, student loans, credit card minimums, personal loans, child support, all of it. This is the number that got my friend in trouble.

For conventional loans, Fannie Mae's guidelines set the standard. For manually underwritten loans, their maximum total DTI ratio is 36%, though it can go up to 45% if the borrower meets certain credit score and reserve requirements. For loans processed through their automated underwriting system, the maximum can reach 50% — but getting approved at that level usually requires strong compensating factors.

FHA loans are often more flexible for borrowers with higher DTIs. According to HUD's guidelines, the total fixed payment to effective income ratio is generally considered acceptable at 43%, but it can go higher if significant compensating factors exist — things like a larger down payment, demonstrated savings ability, or a history of successfully paying similar housing expenses.

What Gets Counted (And What Doesn't)

The list of debts that lenders count is pretty straightforward: car payments, student loans, credit card minimums, personal loans, child support, alimony. Any monthly obligation that shows up on your credit report.

What doesn't get counted is equally important to understand. Groceries, utilities, phone bills, gas, childcare, streaming subscriptions — the stuff that fills up your actual daily budget — none of that shows up in DTI. The lender doesn't care that you spend $800 a month on groceries or $200 on gas. They're looking at credit report data, not your checking account.

How DTI Changes What You Can Afford

Let me show you what DTI does to a home-buying budget with a concrete example. Two buyers, same income, different debt loads.

Same income. Dramatically different borrowing power. That's DTI at work.

What Counts as a "Good" DTI

Under 36% is generally considered the sweet spot. You'll have the most options and the best rates.

Between 36% and 43% is still workable for a lot of borrowers, especially with good credit and stable employment. You might not get the lowest rate, but you'll likely still qualify for conventional loans.

Above 43% and things get harder. You'll need compensating factors — larger down payment, higher credit score, ample savings — to convince a lender to approve you. FHA loans are sometimes more flexible here, allowing approvals above 43% when the borrower has demonstrated an ability to handle housing expenses or has substantial cash reserves.

How to Actually Improve Your DTI

Improving DTI isn't complicated, but it takes time. There are really only two levers: reduce your monthly debt payments, or increase your income.

Paying off a car loan or a credit card balance is the fastest way to make a difference. One $400 monthly payment disappearing from your credit report can shift your DTI by several percentage points. That might not sound like much, but on an $8,000 monthly income, 5% of DTI is $400 — which could mean $50,000 more in borrowing power.

Avoiding new debt before applying for a mortgage matters just as much. Financing a new car or opening a store credit card right before house-hunting can ding your DTI just enough to shrink what you qualify for.

A larger down payment helps indirectly. It reduces your loan amount, which lowers your monthly mortgage payment, which improves your front-end DTI. It doesn't reduce your existing debts, but it makes the housing side of the equation lighter.

The Question Nobody Asks

Everyone wants to know "how much can I get approved for?" The smarter question is "how much payment can I live with?"

Lenders don't know that you want to travel once a year, or that your kid needs braces next year, or that you just feel better with a cushion in your checking account. They're measuring risk, not happiness.

A buyer with 28% front-end DTI is probably going to feel a lot more comfortable than a buyer at 36%. The math looks the same on the lender's screen. The experience of making that payment every month does not.

Our affordability calculator lets you plug in your income, your debts, and a few other numbers to see what home price fits within a reasonable DTI. It's faster than doing the math by hand, and it gives you a realistic starting point before you ever walk into a lender's office.