Mortgage lenders are not just looking at your credit score anymore.
The number that has quietly become the gatekeeper for home loans across the country is your debt-to-income ratio, or DTI — and for a growing share of American households, it is the single biggest obstacle standing between them and a house.
Add up every monthly debt payment you make — car loans, student loans, minimum credit card payments, personal loans — and divide that total by your gross monthly income.
If you earn $6,000 a month and owe $2,000 in payments, your DTI is 33%.
Most conventional lenders prefer to see that number at or below 36%, though many will stretch to 43% or even 50% with compensating factors like strong savings.
The problem is that both halves of that equation have been moving in the wrong direction for buyers.
Credit card balances hit record highs in recent years, average new car payments climbed past $700 a month, and student loan payments resumed for millions of borrowers after the pandemic pause ended.
Meanwhile, wage growth has not kept pace with the cost of housing in many markets.
What counts as "debt" also trips people up.
Lenders generally use the minimum payment listed on your credit card statement, not what you actually pay.
That means a card with a $15,000 balance could count as $300 or more against you every month, even if you pay it off in full.
Lenders also factor in court-ordered obligations like child support, and many now count deferred student loans at a percentage of the balance even when no payment is currently due.
There is one big exception worth knowing.
If you are applying for a government-backed loan — FHA, VA, or USDA — the rules differ.
VA loans, for example, have no hard DTI cutoff, and FHA loans often allow ratios up to 43% and sometimes higher with strong credit and reserves.
A mortgage broker who works with multiple loan types can tell you which program fits your numbers best.
The fix is rarely glamorous, but it is doable.
Paying down revolving balances lowers your minimum payments, which drops your DTI faster than almost any other move.
Avoid financing a new car or furniture in the six months before you apply, since a single new payment can push you over the line.
And if you are close to the threshold, consider adding a co-borrower with steady income, or making a larger down payment to offset the risk in the lender's eyes.
One more note: your DTI is not a permanent label.
Someone who pays off two credit cards and waits a few months can walk back into the same lender with a very different story.
Before you tour a single open house, run your own numbers — total monthly debts divided by gross monthly income — and see where you land.
Knowing that figure ahead of time turns a vague rejection into a to-do list.
Final Thoughts
In a market this expensive, preparation is the cheapest advantage a buyer has.