Mortgage rates have cooled from their 2023 peaks, and that has millions of Americans window-shopping for homes again.
But here is the part that trips up otherwise qualified buyers: your credit score is not the first thing a lender stresses over.
It is your debt-to-income ratio, and it can sink an application even when your FICO score is stellar.
Add up your monthly debt payments — car loan, student loans, minimum credit card payments, personal loans — then divide by your gross monthly income.
Make $6,000 a month and pay $1,800 toward debts?
Most conventional lenders want that total at or below 36%, though some programs stretch to 43% or, with compensating factors, slightly higher.
Lenders don't just look at your existing debts.
They add the estimated monthly payment on the house you want to buy, plus property taxes, homeowners insurance, and HOA dues if applicable.
That combined figure is what gets measured against the 43% ceiling that governs most qualified mortgages.
So a household with a modest $400 car payment and $150 in credit card minimums can watch its buying power shrink by tens of thousands of dollars — not because of the debts themselves, but because of how the mortgage payment stacks on top.
The quickest legitimate fix is paying down revolving balances, since minimum payments on cards are weighted heavily in the calculation.
Paying off a $5,000 card balance might cut $100 or more from your monthly debt load, which can translate into a meaningfully larger loan approval.
A side job or documented raise helps too, because it raises the denominator.
Be careful with the shortcuts being sold online.
Some influencers suggest disputing accurate accounts to temporarily lift your report, or adding yourself as an authorized user on a stranger's card.
Lenders pull updated reports before closing, and mortgage fraud carries real consequences.
There is also a quieter trap: taking on new debt during the house hunt.
Financing a car or opening a store card after preapproval can push your DTI over the line before closing day, and the deal can fall apart.
Lenders and mortgage brokers, mostly, because DTI rules protect them from borrowers who look good on paper but are stretched thin.
It is also why your loan officer may push you toward a smaller house than you wanted — sometimes for your own good, sometimes because a quick closing is their priority, not your long-term comfort.
If you are shopping this spring, run the math yourself before a lender does it for you.
Add up every minimum payment, divide by your gross pay, and see where you land.
Our take: DTI is one of the few mortgage rules that genuinely serves borrowers, even when it stings.
Final Thoughts
Treat it as a budgeting mirror rather than an obstacle, and you will avoid the trap of buying a house that owns you back.