Mortgage rates get all the headlines, but there's a quieter number that can kill your home loan before a lender ever talks about your interest rate.
It's called your debt-to-income ratio, or DTI, and it's climbed into dangerous territory for a lot of American households.
Here's the short version: DTI is the share of your monthly gross income that goes toward debt payments.
Add up your future mortgage, car loan, student loans, minimum credit card payments, and similar obligations, then divide by what you earn before taxes.
Most conventional lenders want that number at or below 43 percent, and many prefer closer to 36 percent.
The problem is that the typical buyer's math has gotten uglier.
Credit card balances have been setting records, auto loan payments are larger, and home prices are still high in much of the country.
So even borrowers with solid credit scores are discovering they qualify for less house than they expected, or nothing in their target neighborhood at all.
FHA loans are a little more forgiving, often allowing DTIs up to around 50 percent with compensating factors like cash reserves or a strong credit history.
But "allowed" doesn't mean "comfortable." Stretching to that ceiling leaves almost no room for a surprise medical bill, a car repair, or a layoff.
The fix isn't mysterious, but it takes time.
Paying down revolving balances helps twice: it lowers your monthly minimums and improves your credit score.
Avoid financing a new car right before you house hunt, since that payment can wreck your ratio overnight.
And if you're close to the line, a larger down payment or a co-borrower can sometimes tip the math in your favor.
One more trap worth knowing: lenders generally use the minimum payment on your statements, not what you actually pay.
So if you've been throwing extra money at a card each month, your DTI may look worse on paper than your real-life budget suggests.
Ask whether a formal letter or updated statement can reflect your true payoff plan.
Self-employed buyers and anyone with variable income should expect extra scrutiny, since lenders often average the last two years of earnings.
A big raise last month won't count for much yet.
The takeaway for anyone planning to buy in the next year or two is simple.
Pull your credit reports, list every monthly debt payment, and run the division yourself before a lender does it for you.
Knowing your number early gives you time to fix it instead of scrambling at closing.
Opinion: DTI deserves more attention than it gets, because it's the gatekeeper that quietly decides who gets to shop and who gets shut out.
Final Thoughts
Rates matter, but your ratio is often the first wall you hit, and it's one you can actually chip away at with a plan.