What Is Debt-to-Income Ratio? Why Banks Reject Good Earners

DTI is the single number that kills more mortgage applications than any other factor — including credit score. Here's how it actually works.

The Simple Formula

DTI = Total Monthly Debt Payments ÷ Gross Monthly Income × 100

If you earn $8,000/month and your debt payments total $3,200/month, your DTI is 40%.

The Two DTI Numbers Banks Use

Front-end DTI (housing ratio): Just your mortgage payment (PITI) divided by income. Conventional limit: 28-31%. FHA: 31-33%.

Back-end DTI (total debt ratio): ALL monthly debt payments + mortgage. This is the one that matters most. Conventional limit: 43-45%. FHA: up to 57% with compensating factors.

What Counts as Debt

• Minimum credit card payments (not balances — minimums)
• Auto loan payments
• Student loan payments (even if deferred — 0.5-1% of balance)
• Personal loan payments
• Child support or alimony
• The new mortgage payment (PITI)

What doesn't count: Utilities, cell phone, insurance, subscriptions, groceries. These are not "debt" in the underwriting sense.

Why Good Earners Get Denied

Making $200,000/year means nothing if you also have $150,000 in student loans, two car payments, and a credit card minimum of $400/month. DTI doesn't care how much you make — it cares about the ratio.

Fastest Ways to Lower DTI

Option 1 — Pay off smallest debts first. Eliminating a $200/month car payment immediately drops your DTI by 2-3 points. This is faster than paying down a $50,000 student loan.

Option 2 — Add income. A documented part-time job or side income, if it has a 2-year history, can be counted. Seasonal income, rental income, and freelance income all have specific rules.

Option 3 — Shop FHA or non-QM. FHA allows higher DTI with compensating factors (strong reserves, good credit). Non-QM lenders have gone as high as 55%.

Not financial advice. Educational content based on 23 years of mortgage industry experience.