Debt-to-Income Ratio: The Key Number Lenders Use

What Is Debt-to-Income Ratio?

Debt-to-income (DTI) ratio is a percentage that compares your total monthly debt payments to your gross monthly income. Lenders use this number to measure your ability to repay borrowed money.

Gross monthly income is the amount you earn before taxes and other deductions are taken out. DTI helps lenders see how much of your income goes toward debt obligations each month.

• Front-end DTI (housing ratio): calculated by dividing monthly housing expenses by gross monthly income. Housing expenses include mortgage principal and interest, property taxes, homeowners insurance, mortgage insurance, and HOA dues.
• Back-end DTI (total debt ratio): includes all monthly debt payments, such as mortgage, car loans, student loans, credit card minimum payments, child support, and alimony, divided by gross monthly income.

Sources: Consumer Financial Protection Bureau, Zillow, Bankrate

How to Calculate DTI

The basic formula is: DTI = (Total Monthly Debt Payments / Gross Monthly Income) x 100. You can calculate both front-end and back-end DTI using the same formula, just with different debt totals.

To get your total monthly debt payments, add up all recurring obligations, such as credit card minimums, car loans, student loans, and rent or mortgage payments (for back-end DTI). For front-end DTI, only include housing-related costs.

Sources: Consumer Financial Protection Bureau, Zillow, Bankrate

What Lenders Consider in DTI

When calculating DTI, lenders look at recurring, documented obligations. They include debt payments that appear on your credit report, such as credit card minimums, auto loans, student loans, personal loans, and alimony or child support.

They exclude non-debt expenses like utilities, groceries, and insurance (except housing insurance, which is part of the housing payment).

• Included: mortgage or rent, credit card minimum payments, car loans, student loans, personal loans, child support, alimony.
• Excluded: utilities, groceries, insurance (except housing).

Sources: Consumer Financial Protection Bureau, Zillow, Bankrate

Typical DTI Limits for Different Loans

Different loan types have different DTI limits. Here are some common thresholds, though specific limits can vary by lender and underwriting system.

For conventional loans, manual underwriting typically allows a maximum back-end DTI of 36%, but it can go up to 45% if you meet credit score and reserve requirements. Automated underwriting (Desktop Underwriter) allows up to 50%.

For a qualified mortgage under CFPB rules, the total DTI cannot exceed 43%.

Sources: U.S. Department of Housing and Urban Development, Zillow, Fannie Mae

Why Lenders Care About Your DTI

A high DTI ratio signals to lenders that you may struggle to meet your monthly repayments. It indicates a larger portion of your income is already committed to debt, leaving less room for new loan payments.

Lenders evaluate DTI alongside credit history and other factors when deciding whether to approve your loan and determining loan terms.

Sources: Federal Deposit Insurance Corporation, Chase

Typical DTI Ranges and What They Mean

A DTI of 36% or less is generally considered good or favorable by lenders. Many conventional loan programs cap back-end DTI around 50%.

Keep in mind that these are general guidelines, not hard rules. Lenders may consider compensating factors, such as a strong credit score or large savings, when you have a higher DTI.

Sources: Consumer Financial Protection Bureau, Zillow, Bankrate, Bank of America

How DTI Affects Your Loan Amount

Your DTI directly influences the loan amount you can qualify for because lenders use it to gauge how much of your monthly income can go toward debt payments. A lower DTI means you have more income available for a new loan payment, allowing you to borrow a larger amount at a given interest rate and term.

The size of the loan you can get depends on that additional payment capacity, along with the interest rate and loan term.

Sources: Consumer Financial Protection Bureau, Zillow

How to Improve Your DTI

If your DTI is higher than you'd like, there are several ways to lower it. The most direct methods are to increase your gross monthly income or reduce your monthly debt payments.

Practical strategies include paying down existing debt, refinancing to lower monthly payments, choosing a less expensive home, and making a larger down payment. You can also avoid taking on new debt while you're preparing to apply for a loan.

• Pay down credit card balances and other debts.
• Increase your income with a raise, side job, or other source.
• Avoid new debt, such as car loans or new credit cards.
• Refinance student loans or other high-interest debt to reduce monthly payments.
• Choose a home that requires a smaller loan amount.
• Make a larger down payment to reduce the mortgage amount.

Sources: Consumer Financial Protection Bureau, Zillow, OneMain Financial