Before a lender ever looks at your credit score, they run one number that quietly determines whether you get approved: your debt-to-income ratio.
It's the total of your monthly debt payments divided by your gross monthly income, and it's one of the biggest hurdles standing between buyers and a mortgage in today's market.
Add up your minimum payments on credit cards, auto loans, student loans, and any other debts.
Divide that by what you earn before taxes.
If you bring home $6,000 a month and owe $2,400 in payments, your DTI is 40%.
Most conventional lenders want to see that number at 43% or below, and many prefer closer to 36%.
What counts as debt often surprises people.
Child support, personal loans, and even a co-signed loan you're not paying on can land in your DTI.
What usually doesn't count: utilities, phone bills, streaming subscriptions, and insurance.
Lenders generally ignore those because they aren't reported as installment or revolving debt.
Some government-backed loans, including FHA mortgages, can stretch higher with compensating factors like strong savings or a bigger down payment.
Even if you qualify, a stretched budget leaves almost no room for a surprise repair, a medical bill, or a layoff.
Paying down balances helps, but the fastest lever is often the credit card minimum.
If you owe $5,000 across cards with a $150 monthly minimum, wiping out that balance drops your DTI by roughly 2.5 percentage points on a $6,000 income.
Avoid opening new credit or financing a car right before you apply for a mortgage.
A larger down payment shrinks the loan, which shrinks the payment, which improves your ratio.
Some buyers also reduce debt with a gift from family, though lenders will want a paper trail on where that money came from.
Timing trips up plenty of first-time buyers.
They get pre-approved, then finance furniture or a truck before closing.
That new payment can push them over the limit and kill the deal days before signing.
Lenders typically recheck your finances right before closing, so keep your credit frozen in place until you have the keys.
Renters hoping to buy should run their own numbers now, not at the lender's desk.
A simple spreadsheet or a free online calculator takes five minutes and tells you exactly where you stand.
Knowing your DTI early gives you months to chip away at balances while you house-hunt, instead of scrambling after a rejection.
It's worth saying that DTI is a guideline, not a verdict.
Lenders weigh it alongside credit history, savings, and income stability.
A 44% ratio with twelve months of reserves may sail through while a 38% ratio with no savings gets flagged.
Ask your loan officer which factors carry the most weight for your specific program.
The takeaway: your DTI is one of the few mortgage hurdles you can actually control before you apply.
Spend a few evenings paying down the smallest balances and you may unlock better rates and a calmer closing day.
Final Thoughts
The paperwork is stressful enough without a last-minute surprise.