What Is Debt-to-Income Ratio (DTI)? A Plain English Guide

Your debt-to-income ratio (DTI) is one of the most important numbers in your financial life — and most people have never heard of it until a lender rejects them.

What Is DTI?

DTI is simple: it's the percentage of your monthly gross income that goes toward paying debts.

Formula: Monthly debt payments ÷ Monthly gross income × 100

Example: You earn $5,000/month. You pay $500 for your car, $200 for student loans, and $1,200 for your mortgage. That's $1,900 in debt payments.

$1,900 ÷ $5,000 = 38% DTI

What's a Good DTI?

DTI	What It Means
Under 36%	Healthy — most lenders approve
36-49%	Caution zone — some lenders will approve
50%+	High risk — most lenders decline

Why Does It Matter?

Lenders use DTI to decide how risky you are as a borrower. A high DTI means a large chunk of your income is already committed to debt — leaving less room to handle a new loan payment.

If your DTI is too high, lenders worry you'll struggle to make payments. That means rejection, higher interest rates, or being required to put more money down.

Two Types of DTI

Front-end DTI (housing ratio): Only your housing costs divided by your income. Most lenders want this under 28%.

Back-end DTI (total DTI): All your debt payments divided by income. This is what most people mean when they say "DTI." Lenders want this under 36-43%.

How to Lower Your DTI

You have two levers:

Increase income — easier said than done, but even a side income counts
Pay down debt — focus on smaller balances first to eliminate payments entirely

If your DTI is high because of mortgage trouble — behind on payments, underwater on your loan — that's a different problem that requires different solutions.

Calculate Your DTI Now

Use our free DTI calculator to find your number instantly.

If your DTI is high because of mortgage trouble, a CDPE specialist at Foreclosure180.com can help you explore options like loan modification or short sale.