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Debt-to-Income Ratio: How Lenders Decide How Much You Can Borrow

Your DTI ratio is the most important number in mortgage qualifying. Here's how it's calculated and how to improve it.

Rick Villa

Rick Villa

May 31, 2024 · 5 Point Capital

If your mortgage application is declined or your approval comes in lower than expected, there’s a good chance your debt-to-income ratio (DTI) is the issue.

What Is DTI?

DTI is the percentage of your gross monthly income that goes toward debt payments.

There are two types:

Front-end DTI (housing ratio): New housing payment (PITI) ÷ Gross monthly income

Back-end DTI (total debt ratio): (New housing payment + all monthly debt obligations) ÷ Gross monthly income

Lenders look at both, but back-end DTI is most important.

DTI Limits by Loan Type

Loan TypeFront-End MaxBack-End Max
Conventional28%43–45%
FHA31%43–57%
VANo front-end limit41% (flexible)
Jumbo36–38%43%

What Counts as “Debt” in DTI?

Monthly obligations pulled from your credit report:

  • Minimum credit card payments
  • Car loans
  • Student loans (even if in deferment, for FHA)
  • Personal loans
  • Child support / alimony
  • Other mortgage payments

What’s not included: utilities, insurance, subscription services, groceries.

How to Lower Your DTI

  1. Pay off small debts — Eliminating a $200/month car payment can add $50,000+ to your purchase power
  2. Increase income — Part-time income from a second job is often usable if you’ve had it for 2+ years
  3. Don’t take on new debt in the months before applying
  4. Buy less house — The simplest solution

Student loan note: FHA uses 1% of the outstanding balance as the monthly payment if it’s in deferment. This can dramatically affect FHA qualifying. Conventional uses income-based repayment amounts.

We will calculate your exact DTI in your first conversation and show you clearly where you stand and what adjustments could help.

Have questions about your situation?

Rick offers free, no-obligation consultations. Get personalized advice for your specific loan or home.