Mortgage rates have cooled from their pandemic-era panic highs, and plenty of buyers assume that's the green light to start house hunting.
But loan officers keep flagging a different number that has nothing to do with the Fed: your debt-to-income ratio.
DTI is the share of your gross monthly income that goes toward debt payments.
That includes your future mortgage plus car loans, student loans, minimum credit card payments, and personal loans.
If it climbs too high, lenders don't care that you have a stable job or a solid down payment.
Add up every monthly debt payment, divide by your pre-tax monthly income, and multiply by 100.
Someone earning $6,000 a month with $1,800 in total debt payments sits at 30%.
Most conventional loans want you at or below 43%, though some programs stretch to 50% with compensating factors like cash reserves or a long credit history.
Lenders use the minimum payment on your credit cards, not what you actually pay.
So if you owe $8,000 across three cards with a $200 combined minimum, that's what counts — even if you send $600 every month.
Paying down balances before you apply can move your DTI faster than waiting for a raise.
Federal loans on an income-driven repayment plan may be counted at a small percentage of the balance, but many lenders still use 1% of the total.
On a $40,000 balance, that's $400 a month the underwriter sees, whether you're paying it or not.
Your current rent doesn't count in DTI once you buy, which helps.
But if you're carrying a car payment you took on during the last few years of inflated prices, that obligation follows you into the calculation.
Paying off a small loan entirely can erase a payment from the tally.
Refinancing a car loan to a lower payment shaves the monthly figure.
Increasing your documented income — a raise, a side gig with two years of history, or adding a co-borrower — raises the denominator and lowers the ratio.
And shopping with lenders who offer automated underwriting can sometimes get you approved above 43% if the rest of your file is strong.
One caution: don't open a new credit card or finance furniture for the new place while you're under contract.
A fresh minimum payment can push you over the threshold right before closing, and some lenders re-pull credit.
The takeaway is that your mortgage rate isn't the only number deciding your fate.
Run your own DTI before a lender does, fix the easy pieces first, and you'll walk into pre-approval with fewer surprises.
Final Thoughts
It's boring homework that saves real money.