Mortgage rates have finally started easing, and plenty of buyers assume that a lower rate is their golden ticket back into the housing market.
But loan officers keep running into the same wall: borrowers who can comfortably afford a payment on paper still get turned down.
The culprit usually isn't the rate or the credit score.
Add up every monthly debt payment — car loans, student loans, minimum credit card payments, personal loans, child support — then divide that total by your gross monthly income.
If you bring in $6,000 a month and owe $2,400 in payments, your DTI is 40%.
That single number can decide whether you get a mortgage and how much house you're allowed to buy.
Most conventional loans want your DTI at or below 43%, though some programs stretch to 45% or even 50% with compensating factors like strong cash reserves or a big down payment.
FHA loans often allow ratios up to 50%, and VA loans can go higher still.
Cross those lines and you're looking at a denial, a smaller loan amount, or a higher rate to offset the lender's risk.
The trap is that DTI counts debt you barely think about.
A $30 minimum payment on a store card you never use still gets counted.
Even a student loan in deferment can be counted at a percentage of the balance, depending on the lender.
Buyers who feel debt-free on a Monday can watch their ratio balloon by Friday once the underwriter adds everything up.
Paying down revolving balances helps fast, because cutting a credit card balance lowers the minimum payment, which lowers your DTI.
Paying off a small installment loan entirely can wipe that payment from the calculation.
Avoiding new credit in the months before you apply matters too — that new truck payment can sink a deal that was otherwise fine.
One more wrinkle: lenders generally use the payment on your credit report, not what you actually pay.
If you've been overpaying a card to knock it down, your DTI might look worse than your real finances.
Ask your loan officer which debts are counted and how, before you assume you're out of the running.
The takeaway is that DTI is often the quiet gatekeeper in a mortgage application, and it's one of the few levers you can actually pull before you apply.
Check your ratio early, pay down what you can, and hold off on big purchases until you've closed.
Final Thoughts
A slightly lower rate is nice, but clearing the DTI bar is what gets you the keys.