A quiet number buried in your credit report is now doing more to decide whether you get a home loan than your credit score ever did.
It's called the debt-to-income ratio, and as of this summer, lenders are leaning on it harder than at any point since the 2008 crash.
Add up every monthly debt payment you make — car loan, student loans, minimum credit card payments, personal loans, plus the new mortgage you're hoping to get.
Divide that total by your gross monthly income.
A $6,000 monthly income with $2,400 in total debt payments puts you at 40%.
The reason this matters right now: the 28/36 rule that lenders used for decades has quietly loosened, and that's cutting both ways.
Conventional loans backed by Fannie Mae and Freddie Mac will generally approve you up to 45% DTI, and some automated underwriting systems stretch to 50% if you have compensating factors like strong cash reserves.
Federal Housing Administration loans, popular with first-time buyers, often allow up to 43% and sometimes higher with documentation.
But here's the catch that's tripping people up.
Credit scores above 740 used to smooth over almost anything.
Lenders have tightened overlays — their own extra rules stacked on top of agency guidelines — and many now cap DTI at 43% regardless of how pristine your credit is.
A 780 score with a 48% DTI can get rejected while a 700 score at 38% sails through.
The pandemic-era savings cushion that let buyers pay down cards and qualify has mostly evaporated.
Credit card balances hit record highs last year, auto loan delinquencies are climbing, and student loan payments restarted.
All three push DTI upward at the exact moment lenders are watching it more closely.
Paying off a $300 monthly car note on a $6,000 income drops your DTI by 5 percentage points — often the difference between approval and denial.
Paying down a credit card doesn't help your DTI unless you close the account or the minimum payment actually falls, since lenders count minimums, not balances.
And a larger down payment doesn't change DTI at all, which surprises a lot of buyers who assume cash solves everything.
One strategy worth knowing: if you're self-employed or earn bonuses and commissions, ask your loan officer whether they'll use a 12-month or 24-month average of your variable income.
The right calculation can raise your qualifying income meaningfully, and not every lender volunteers it.
Married couples should also run the math both ways.
Adding a spouse with low income but high debt can sink an application that would have been approved on one income alone.
The takeaway for anyone house hunting this year is uncomfortable but simple: get your DTI calculated before you fall in love with a listing, not after.
A 20-minute conversation with a loan officer about that one number can save you months of rejected offers and dragged-out pre-approvals.
Our take: DTI has quietly become the most consequential number in American homebuying, and most buyers don't learn theirs until it's too late to fix it.
Final Thoughts
If you're planning to buy within the next year, treat it like a credit score — check it now, watch it monthly, and attack the smallest debt payments first.