Mortgage rates have cooled off from their recent peaks, and plenty of buyers are diving back into the market.
But lenders aren't just looking at your credit score and down payment anymore.
There's one number that can quietly make or break your approval, and most buyers don't check it before they start touring homes.
It's called your debt-to-income ratio, or DTI.
In simple terms, it's the percentage of your gross monthly income that goes toward debt payments.
Add up your minimum credit card payments, car loan, student loans, and any other recurring debt, then divide that total by what you earn each month before taxes.
Here's where it gets tricky for house hunters.
Lenders typically want your total DTI, including the new mortgage payment, to stay at or below 43% for most qualified mortgages.
Some conventional loans allow up to 50% with strong credit and reserves, but pushing past that line gets expensive fast.
Say you bring home $6,000 a month before taxes.
A 43% cap means all your debt payments combined, including the estimated mortgage, can't exceed about $2,580.
If your car payment and student loans already eat up $800, that leaves roughly $1,780 for a house payment, which covers principal, interest, taxes, and insurance.
A household earning $72,000 a year might assume they can afford a $350,000 home, but after existing debts and today's rates, the realistic number could be closer to $220,000.
Realtors say this gap between what buyers expect and what underwriters allow is one of the biggest reasons deals fall apart late in the process.
The good news is that DTI is one of the few mortgage numbers you can actually change before you apply.
Paying down a credit card balance lowers your minimum payment, which lowers your ratio immediately.
Paying off a small car loan entirely can free up hundreds in monthly obligations.
Even disputing an error on your credit report can help if it's inflating a payment.
A few practical moves worth making a few months before you house hunt: avoid financing a new car, skip store credit card offers at checkout, and don't co-sign a loan for anyone, even family.
Each of those can spike your DTI right when a lender is reviewing your file.
It also helps to get pre-approved before you fall in love with a listing.
A loan officer will run your actual numbers and tell you the price range you qualify for, not the one you saw in an online calculator.
That conversation takes about 20 minutes and can save months of frustration.
First-time buyers should also ask about FHA loans, which sometimes allow DTI up to 50% with compensating factors like cash reserves or a strong payment history.
VA loans for veterans and service members tend to be more flexible as well.
The trade-off is usually a higher monthly payment or mortgage insurance, so run the full picture, not just the interest rate.
One more thing: your DTI isn't the only gatekeeper.
Lenders also look at your credit score, savings after closing, and employment history.
A 42% ratio with a 580 credit score tells a very different story than the same ratio with a 760.
The bottom line is that your income alone doesn't decide what you can buy.
Final Thoughts
Your existing debts do just as much of the talking, and they're often the easiest thing to fix before you apply.