Then the lender runs the numbers and says no, and the reason has nothing to do with your credit score.
It's your debt-to-income ratio, and it has quietly become the most common deal-killer in the mortgage market right now.
Here's the math that's tripping people up.
Your DTI is all your monthly debt payments divided by your gross monthly income.
That includes car loans, student loans, minimum credit card payments, personal loans — everything, not just the mortgage you're applying for.
Most conventional lenders want that number at or below 43%, and many now prefer 36% or lower.
Here's the squeeze: a 2024 study from the real estate data firm ATTOM found that in roughly three-quarters of U.S. counties, median-priced homes are not affordable for average wage earners.
In other words, in most of the country, the typical house now costs more than the typical income can comfortably carry — before you even add a car payment.
So who benefits from a strict DTI cutoff?
The mortgage industry will tell you it's about keeping borrowers out of default.
There's truth to that — the 43% line traces back to research suggesting borrowers above it struggle more with payments.
But lenders also sell your loan to investors like Fannie Mae and Freddie Mac, and those buyers have their own rules.
Meeting the cutoff keeps the pipeline clean for them.
The person absorbing all the risk and all the rejection isn't the lender.
There are ways to work the number in your favor.
Paying down a credit card balance lowers your minimum payment, which drops your DTI even if your income doesn't change.
A larger down payment shrinks the loan amount and the monthly payment.
Some buyers bring in a co-signer or a co-borrower to combine incomes.
Others wait six months and let a car loan age off.
A mortgage broker can also check you against multiple loan programs, because an FHA loan and a conventional loan don't use identical DTI limits.
None of these are magic fixes, but they change what a calculator spits out.
The noise you should ignore is the "just talk to a lender and they'll make it work" pitch.
Sometimes a lender can find a workaround.
Often, "make it work" means an adjustable-rate loan or a higher rate that costs you thousands over the life of the mortgage.
Ask what your rate would look like at 36% DTI versus 43% before you sign anything.
One more thing worth watching: as of this writing, average 30-year mortgage rates have been bouncing around the mid-6% range, well above the sub-3% era.
High rates make every debt payment hurt more, which pushes DTI up for everyone.
This isn't a doom story, but it's not a happy accident either — it's a structural shift in who can buy a home.
Our take: DTI isn't a scam, but it's a blunt instrument that penalizes people with old student loans and expensive cars more than it measures whether they can actually pay a mortgage.
Learn your number before a lender runs it for you.
Final Thoughts
Knowing it early gives you months to fix it instead of finding out at the closing table.