Mortgage rates are finally showing signs of cooling, but a lot of would-be buyers are running into a wall that has nothing to do with rates.
It's a number most people have never calculated: their debt-to-income ratio.
Lenders call it DTI, and it quietly decides who gets approved and who gets a polite rejection letter.
Your DTI is all your monthly debt payments divided by your gross monthly income — the money you earn before taxes.
Add up your rent or current mortgage, car loan, minimum credit card payments, student loans, and personal loans.
Divide that total by what you bring in each month.
Most conventional loans want your DTI at or below 43%.
Some lenders stretch to 50% for borrowers with strong credit and cash reserves.
Go above that, and you're likely looking at a denial or a much smaller loan than you hoped for.
Your $1,200 rent payment matters, but so does the $35 minimum on a credit card you barely use.
Lenders look at minimums, not what you actually pay.
That's why paying off a small card can help more than people expect — it doesn't just free up cash, it lowers the ratio the underwriter sees.
Say you earn $6,000 a month before taxes.
Your car payment is $450, your student loans are $300, and your credit card minimums total $150.
That leaves room for a mortgage payment of roughly $1,680 to land at 43%.
In many markets right now, that payment doesn't buy much house.
This is the squeeze a lot of buyers are feeling.
Home prices climbed hard for years, and even with rates easing, the monthly math is tight.
A 43% cap that felt generous in 2019 can feel suffocating when a starter home in your area costs $400,000.
First, pay down or pay off high-minimum debts — credit cards and personal loans are the usual targets.
Second, avoid taking on new debt during the mortgage process, even a car lease or a furniture financing deal.
Third, if you can, document income that lenders might not count automatically, like side gigs or freelance work.
One more thing worth knowing: lenders calculate two versions of DTI.
The front-end ratio covers just housing costs.
Most approvals hinge on the back-end number, so don't assume a low rent payment gives you a free pass.
If you're planning to buy in the next year, run your own numbers this week.
Pull your credit report for free at AnnualCreditReport.com, list every minimum payment, and do the division.
Knowing your ratio before a lender does puts you in control of the conversation instead of reacting to it. **The takeaway:** DTI isn't glamorous and nobody puts it on a vision board, but it's the gatekeeper standing between you and a mortgage approval.
Spend twenty minutes calculating yours, then attack the smallest high-minimum debts first.
Final Thoughts
Small moves now can mean a very different answer from the underwriter later.