Debt-to-Income: The Number That Prices Everything You Borrow
Your card balances don't just cost interest. They raise the rate on your next car loan, your mortgage, and the consolidation loan you're hoping will fix them.
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Key takeaways
- DTI = total monthly debt payments ÷ gross monthly income. $2,100 on $6,000 of income is 35%.
- Under 36% is most lenders' comfort zone; over 50% means frequent declines regardless of score.
- Revolving debt counts twice: once in utilization (score) and once in DTI (underwriting).
What it is
Total monthly debt payments (as reported on your credit file: minimums on cards, installment payments, mortgage or rent in some models) divided by gross monthly income. $2,100 in payments on $6,000 of income is a 35% DTI.
Where the lines are
- Under 36%: most lenders' comfort zone. Best pricing available to your score.
- 36–43%: approvable, often at a worse tier. Many mortgage programs cap near 43–50% depending on compensating factors.
- Over 50%: frequent declines for unsecured credit regardless of score.
$18,000 in card balances ≈ $540/mo of DTI
At a typical minimum formula, that's 9 points of DTI on a $6,000 income, which can be the difference between the 36% tier and the 45% tier on your next application.
The hidden cost
Revolving debt counts against you twice: once in utilization (score) and once in DTI (underwriting). A borrower with a good score and a 48% DTI often gets priced like a borrower with a mediocre score. On a $30,000 car loan, one tier can mean $1,500–$3,000 in extra interest. On a mortgage, far more.
What moves it fastest
Paying a card to zero removes its entire minimum from the numerator. Consolidating several cards into one loan sometimes lowers DTI (one fixed payment smaller than the combined minimums) and sometimes raises it (a short term with a large payment). Check before you apply: the loan that fixes your interest cost shouldn't wreck the application after it.
The double count
Revolving debt counts against you twice.
