Mortgage lenders don't just look at your credit score.
They look at how much of your monthly income is already spoken for.
That number is your debt-to-income ratio, or DTI, and it has quietly become one of the biggest gatekeepers in the housing market.
Add up your monthly debt payments — car loans, student loans, minimum credit card payments, personal loans, plus the estimated mortgage payment you're applying for.
Divide that total by your gross monthly income.
If you earn $6,000 a month and owe $2,400, your DTI is 40%.
Most conventional loans cap DTI at 43% to 45%.
FHA loans often allow up to 50%, sometimes higher with compensating factors like cash reserves or a strong credit score.
Go over the line and you're looking at a denial, a smaller loan than you wanted, or a requirement to pay down debt before closing.
The catch is that lenders count your minimum credit card payment, not your balance.
A $6,000 balance with a $90 minimum only counts as $90.
But that same card with a 29% APR can keep you stuck for years while it eats into your borrowing power.
If your DTI is too high, you have a few realistic moves.
Pay down revolving debt first, since it improves your ratio fastest.
Avoid financing a new car or furniture before you apply.
And consider adding a co-borrower with steady income, which can raise the income side of the equation.
One more thing worth knowing: student loan payments are now counted differently under updated lender guidelines, and some borrowers are surprised to find their ratio jumped even though their payment didn't change.
Ask your loan officer exactly how they're calculating yours before you fall in love with a house.
A lower DTI doesn't just help you qualify.
It means more breathing room in your budget every month after closing, which matters when property taxes, insurance, and repairs show up uninvited.
Our take: your DTI is one of the few mortgage numbers you can genuinely improve in a few months, and doing so before you shop beats scrambling after a rejection.
Final Thoughts
Pay down the plastic, hold off on the new truck, and walk into your lender's office with a ratio that works in your favor.