Mortgage rates have finally started easing, and plenty of buyers are rushing back into the market expecting good news at the loan office.
But there's a number on your application that has nothing to do with rates, and it can sink a deal faster than a low credit score.
It's your debt-to-income ratio, or DTI, and it's tripping up more buyers than most people realize.
Lenders add up every monthly debt payment you owe, then divide that total by your gross monthly income.
Car loans, student loans, minimum credit card payments, and any new mortgage payment all count.
If you earn $6,000 a month and owe $2,400 across those debts, your DTI is 40%.
Most conventional lenders prefer a DTI at or below 43%, though some government-backed loans allow higher.
Cross that line and you're not automatically rejected, but you move into "compensating factors" territory, meaning the lender wants bigger reserves, a stronger credit score, or a larger down payment to feel comfortable.
The trap is that many buyers calculate DTI using the wrong debts.
Lenders count minimum payments, not what you actually pay.
If you throw $500 a month at a credit card but the minimum is $35, only the $35 hits your ratio.
That cuts both ways: paying down a card helps less than you'd think, while opening a new one can sting more than expected.
The sneaky culprit right now is auto loans.
The average new car payment has climbed past $700 a month, and a single vehicle loan can push a borderline buyer from approvable to denied.
Lenders typically use 1% of the balance as a monthly payment, even if you're on an income-driven plan paying far less.
Paying off a small installment loan entirely, like a store card or a nearly finished car note, can drop your DTI by several points overnight.
Refinancing a high car payment, or consolidating credit card balances into a fixed personal loan, can shrink the monthly obligation lenders see.
And timing matters: don't finance new furniture or a car in the six months before you apply for a mortgage.
Fannie Mae and Freddie Mac have been rolling out updated automated underwriting tools that look at a borrower's full financial picture, not just the raw ratio.
That means a 45% DTI with healthy savings and a long history of on-time payments isn't the automatic dead end it once was.
But it still helps to walk in with the cleanest numbers you can manage.
Before you fall in love with a listing, run your own math.
Pull your credit report, list every minimum payment, and divide by your gross income.
If you're hovering near 43%, talk to a loan officer early, not after you've made an offer.
My take: buyers obsess over the interest rate because it's the headline number, but DTI is the bouncer at the door.
A slightly higher rate costs you money over 30 years.
A DTI that's too high costs you the house entirely.
Final Thoughts
Fix the ratio first, then shop for the rate.