Mortgage lenders have quietly tightened the screws, and the number that decides whether you get a home loan isn't your credit score.
It's your debt-to-income ratio, or DTI — and for a growing share of buyers, it's the single reason an approval never comes.
Lenders add up every monthly debt payment you owe — car loan, student loans, minimum credit card payments, personal loans, plus the new mortgage you're applying for — then divide that total by your gross monthly income.
A $2,000 total debt load against $6,000 in monthly pay equals a 33% DTI.
The magic threshold most conventional loans follow is 43%.
Cross it, and you're typically bumped out of the "qualified mortgage" lane, which is the safer category lenders prefer.
Plenty of borrowers still get approved between 43% and 50% with compensating factors like hefty cash reserves or a strong credit history, but the wiggle room is shrinking.
FHA loans are more forgiving on paper, often allowing DTIs up to 50% with documented exceptions.
VA loans can stretch higher still for veterans.
But "allowed" and "approved" are two different things.
Underwriters have discretion, and in a market where home prices remain stubbornly high and rates are still elevated compared to the pandemic era, they're using it.
The trap is that rising costs inflate your DTI without you doing anything wrong.
A car insurance hike, a higher minimum card payment after a rate increase, or a new student loan bill can all nudge you over the line.
Lenders recalculate at the worst possible moment — right before closing — which is why some buyers get blindsided after they've already paid for an inspection and appraisal.
The fastest lever most people can pull is paying down revolving debt.
Credit cards hurt your DTI the most because minimum payments are calculated on the balance, so knocking down a $5,000 balance can shave real percentage points off your ratio.
Paying off a small car loan entirely can also help, even if the monthly payment felt manageable.
If you're close to the edge, documenting side gig income, a raise, or a co-borrower's earnings can change the math.
Lenders generally want a two-year history for self-employment income, so this isn't an overnight fix — but it's legitimate and often overlooked.
The third move is shopping for the loan program rather than the rate.
A mortgage broker who works with multiple lenders can identify which ones will consider a 46% DTI versus the ones that hard-stop at 43%.
That single conversation can be worth more than a fraction of a point on the interest rate.
Before you fall in love with a listing, run your own numbers.
Add up your minimum payments, divide by your gross income, and see where you land.
If you're already above 40%, start paying down debt months before you apply — not weeks.
The honest takeaway: DTI is a blunt instrument that punishes people for costs largely outside their control, and a rigid 43% line doesn't reflect what a household can actually afford.
Final Thoughts
But until lenders loosen that standard, it's the number that decides your future — so treat it like the priority it has become.