Mortgage rates get all the headlines, but there's a less glamorous number quietly determining whether you get approved for a home loan at all.
It's your debt-to-income ratio, or DTI, and it's become one of the biggest hurdles for buyers in today's expensive housing market.
Here's how it works: lenders add up your monthly debt payments — car loans, student loans, credit card minimums, and the mortgage you're applying for — then divide that by your gross monthly income.
If you earn $6,000 a month and your total debt payments hit $2,700, your DTI is 45%.
That 45% figure matters more than most buyers realize.
Many conventional loans cap DTI at 43% to 45%, while some government-backed FHA loans allow ratios up to 50%.
Cross that line and you may get denied — even with a solid credit score and a healthy down payment.
The squeeze is hitting real households now.
Credit card minimums have climbed as balances grew, and auto loan payments have jumped with higher prices and rates.
That leaves less room in the budget for a mortgage payment, which is exactly what underwriters are calculating.
What trips people up is the debt they forget to count.
Student loans in deferment still get factored in.
A cosigned loan for a family member counts against you even if you never make a payment.
Lenders pull the full picture, so surprises happen at the worst time.
If your ratio is too high, you have a few levers.
Paying down a credit card can shrink your minimum payment fast, sometimes by hundreds of dollars a month.
Paying off a small car loan entirely can knock a whole line item out of the equation.
And boosting your income — a raise, a side gig, a documented bonus — helps the math on the other side of the fraction.
Lenders typically look at your most recent statements, so paying down balances right before you apply can move the needle.
Just don't open a new credit card or finance furniture for the new place in the months before closing, since that new payment gets added to your ratio.
Buyers with high DTIs aren't out of options.
Some lenders offer compensating factors — bigger reserves, a larger down payment, or strong credit — that can push an approval through above the usual threshold.
It's worth asking directly rather than assuming a no.
The takeaway is simple: before you fall in love with a listing, run your own DTI math.
Knowing your number early tells you whether to shop for a home or spend a few months paying down debt first.
Final Thoughts
A little prep work now can save a lot of heartbreak at the closing table.