Mortgage rates get all the headlines, but there's a less glamorous number that can sink a home loan before a lender ever looks at your credit score: your debt-to-income ratio.
And in 2025, with credit card balances near record highs and grocery bills still stubbornly elevated, that ratio is creeping up for millions of Americans who feel like they're doing everything right.
Lenders divide your total monthly debt payments—credit cards, car loans, student loans, personal loans, plus the projected mortgage payment—by your gross monthly income.
Most conventional loans want that number at or below 36% to 43%.
Cross 50%, and you're typically looking at a denial for a standard mortgage, even with a spotless payment history.
The squeeze is coming from both directions.
The Federal Reserve's rate hikes pushed average credit card APRs above 20%, so minimum payments on the same balance now eat more of your paycheck.
Meanwhile, rents and auto loan payments ballooned through 2023 and 2024.
Someone who qualified for a home two years ago may not qualify today—not because they earned less, but because everything else costs more.
FHA loans are more forgiving, often allowing DTIs up to 43% to 50% with compensating factors like cash reserves or a strong credit score.
Some lenders stretch conventional approvals to 45% or 50% for borrowers with excellent credit.
But there's a catch: a higher DTI often means a higher rate or extra requirements, which quietly adds tens of thousands in interest over 30 years.
Paying down revolving debt is the fastest lever, because lenders count minimum payments, not balances—knocking out a $150 monthly card payment can lower your DTI by several points overnight.
Avoid financing a car right before house hunting, and be careful with "buy now, pay later" plans, which increasingly show up in underwriting reviews.
Also, don't close old credit cards mid-application; it can hurt your score without helping your DTI.
One trap trips up otherwise savvy buyers: changing jobs or going freelance right before applying.
Lenders want stable, documented income, and a commission-heavy or self-employed year can shrink the income side of the equation, pushing your ratio over the limit.
If you're close to the line, a co-borrower's income can help—but their debts count too.
The bigger picture is that the 36% benchmark was set in an era of cheaper housing and lower consumer debt.
Today's buyers are trying to hit a 1990s target with 2025 prices.
That doesn't mean homeownership is out of reach, but it does mean the down payment isn't the only number to watch.
Our take: your DTI is one of the few mortgage factors you can genuinely improve in a few months.
Before you tour a single open house, pull your credit report, add up every monthly payment, and run the division yourself.
Final Thoughts
Walking into a lender's office already knowing your number puts you in a much stronger position than hoping the math works out in your favor.