Mortgage rates get all the headlines, but a less glamorous number is quietly killing more loan applications in 2025: your debt-to-income ratio.
Lenders use DTI to decide whether you can realistically afford a monthly payment, and it has quietly become the single biggest hurdle for first-time buyers.
Add up every monthly debt payment — car loans, student loans, minimum credit card payments, personal loans, plus the new mortgage you're applying for.
Divide that by your gross monthly income.
That percentage is your DTI, and most conventional lenders want it at or below 36% to 43%.
The problem is that the math has gotten brutal.
A typical new mortgage payment now runs well above $2,000 a month in much of the country, according to housing industry data.
Add a $500 car payment and $200 in minimum credit card payments, and a household earning $6,000 a month is already brushing the ceiling before groceries enter the picture.
FHA loans allow DTIs up to 43% and sometimes higher with compensating factors, but that flexibility comes with mortgage insurance premiums that add to your monthly cost.
VA loans are often more forgiving, which is one reason they remain a popular path for eligible veterans and service members.
Paying down revolving debt is the fastest lever, because credit card minimums are calculated on the balance.
Knocking a $5,000 card down to $1,000 can cut your monthly minimum by more than $100 — and that directly lowers your DTI.
Second, avoid financing a car or taking on new installment debt in the six to twelve months before you apply.
Lenders pull your credit late in the process, and a fresh auto loan can sink a deal that was already approved.
Third, be careful with "buy now, pay later" plans.
Some lenders now count those installment obligations in DTI calculations, and a stack of small BNPL payments can look like a red flag even if each one is tiny.
A common mistake is assuming a higher salary solves everything.
It helps, but lenders look at the ratio, not the raw income.
Someone earning $120,000 with $2,500 in monthly debt payments can look riskier than someone earning $80,000 with $600 in payments.
Another trap: co-signing a loan for a family member.
That obligation typically shows up in your DTI even if you never make a payment, and it can quietly disqualify you months later.
If you're planning to buy within a year, run your own numbers now.
Add up your minimum payments, estimate a realistic mortgage payment including taxes and insurance, and divide by your gross income.
If you're above 40%, you have time to fix it before a lender does the math for you.
Rates matter, but your debt load may matter more — and it's the one part of the equation you can actually control.
Final Thoughts
Start chipping away at balances and hold off on new loans, because a lower DTI is often worth more than waiting for rates to drop.