Mortgage rates get all the headlines, but there's a quieter number doing more to decide who buys a home this year: your debt-to-income ratio.
Lenders use it to answer one blunt question — after your existing bills, is there enough paycheck left to cover a new house payment?
With the average 30-year fixed rate hovering in the mid-6% range and home prices still near record highs, that math has gotten brutally tight.
Add up your minimum monthly debt payments — car loans, student loans, credit card minimums, personal loans — and divide by your gross monthly income.
A $6,000 monthly income with $1,500 in debt payments puts you at 25%.
Most conventional loans want that total, including the new mortgage, at or below 36% to 43%.
Cross the line and you're not automatically denied, but your options shrink fast.
The squeeze is real because the same inflation that pushed up grocery bills also pushed up everything feeding the denominator.
The Federal Reserve's rate hikes made car loans and credit cards far more expensive, so minimum payments on the same balances are bigger than they were three years ago.
A card balance that cost $75 a month in 2021 might now demand $110 — and that's before you've bought a single house.
Rising rents mean less money left to save for a down payment, while higher card balances from covering everyday costs inflate the debt side of the equation.
It's a loop: prices rise, you lean on credit, your ratio worsens, and the mortgage you qualify for shrinks — or vanishes.
Paying down revolving debt helps more than almost anything, because lenders weigh minimum payments heavily and credit cards carry the highest required payments relative to the balance.
Avoid opening new credit or financing a car in the months before applying.
And if you're close to the line, ask about FHA loans, which often allow ratios up to 43% and sometimes higher with compensating factors like cash reserves or a long work history.
If you've gotten a raise, a side gig, or child support, make sure the loan officer sees it.
Some buyers qualify for noticeably more simply because their file understates what they actually earn.
Lenders don't guess — they count what's on paper.
First-time buyers should also know that the 28/36 rule many of us grew up hearing is more of a guideline than a law.
Some loan programs push past 45% or even 50% with strong credit and reserves.
The catch is that a higher ratio means a thinner cushion every month.
Qualifying isn't the same as affording, and a mortgage that eats half your take-home pay leaves little room for a furnace repair or a layoff.
The practical takeaway: run your own numbers before a lender does.
Add your minimum payments, divide by gross income, then estimate a house payment at today's rates plus taxes and insurance.
If the total lands above 43%, start paying down balances now — every $100 shaved off a monthly minimum can move your ratio by more than a full percentage point.
None of this is glamorous, and it won't make rates fall.
But in a market where affordability is stretched, the buyers who win aren't always the ones with the biggest salaries — they're the ones who walked in with the cleanest debt load.
Final Thoughts
Your ratio is the one part of the mortgage equation you can actually control, and it's worth treating like the gatekeeper it has become.