Debt-to-Income Ratio: What It Is and How to Calculate It (2026)

Your debt-to-income ratio (DTI) is one of the most important numbers in personal finance. Lenders use it to determine whether you can afford a mortgage, and a high DTI can block you from getting approved even with excellent credit.

Table of Contents

How to Calculate Your DTI

DTI Formula: Total Monthly Debt Payments ÷ Gross Monthly Income × 100

What Counts as Monthly Debt

Included in DTI NOT Included
Mortgage or rent payment Utilities
Auto loan payment Health insurance
Student loan payment Groceries and food
Credit card minimum payments Cell phone bill
Personal loan payments Subscriptions
Child support / alimony Gas and transportation
Home equity loan / HELOC Property taxes (sometimes separate)

DTI Calculation Example

Monthly Debt Amount
Mortgage $1,800
Auto loan $520
Student loans $380
Credit card minimums $200
Total monthly debts $2,900
Gross monthly income $7,500
DTI 38.7%

DTI Ranges and What They Mean

DTI Range Rating Lender Perspective
Under 20% Excellent Best rates and easy approval for everything
20–35% Good Competitive rates, approved for most products
36–43% Acceptable May face restrictions, especially for mortgages
43–50% High Difficult to get conventional mortgage; FHA possible
Over 50% Very High Most lenders will deny; serious financial stress

DTI Requirements by Loan Type

Mortgages

Loan Type Max Front-End DTI Max Back-End DTI Notes
Conventional 28% 36–45% Higher DTI possible with strong compensating factors
FHA 31% 43–50% More flexible on DTI than conventional
VA No limit* 41% guideline *Residual income test used instead
USDA 29% 41% Strict ratios
Jumbo 28% 36–43% Stricter requirements for larger loans

Front-end DTI: Housing costs only (mortgage + taxes + insurance) ÷ gross income
Back-end DTI: All debts (including housing) ÷ gross income

Other Loans

Loan Type Typical Max DTI
Auto loan No hard limit; higher DTI = higher rate
Personal loan Varies; most prefer under 40%
Credit card No DTI check for most cards
HELOC 43–50%
Business loan (SBA) Varies by lender

Average DTI in America

Age Group Average DTI
Under 25 22%
25–34 37%
35–44 41%
45–54 38%
55–64 30%
65+ 22%

DTI peaks during prime working and home-buying years (35-44), when mortgages, student loans, and family expenses overlap.

How DTI Affects Mortgage Rates

Even if you qualify, a higher DTI often means:

DTI Rate Impact Approval Likelihood
Under 36% Best rates Easily approved
36–40% Slight markup Approved with good credit
40–43% Higher rates Approved with compensating factors
43–50% FHA rates Conventional denied; FHA possible

Compensating factors that let you exceed 43%:

  • Credit score above 740
  • Large cash reserves (6+ months)
  • Strong employment history
  • Significant assets
  • Low loan-to-value ratio (large down payment)

Strategies to Lower Your DTI

Reduce the Numerator (Pay Down Debt)

Strategy Impact on DTI Example
Pay off credit cards Eliminates minimum payments $200/month saved = 2.7% DTI reduction at $7,500 income
Pay off auto loan Eliminates car payment $520/month saved = 6.9% DTI reduction
Refinance student loans Extends term, lowers payment $380 → $250/month = 1.7% DTI reduction
Consolidate debt Combines to lower single payment Varies

Increase the Denominator (Raise Income)

Strategy Impact
Ask for a raise Directly lowers DTI
Take on a side income If documented for 2+ years, lenders count it
Add a co-borrower Combined income lowers DTI
Demonstrate bonus/commission income Must show 2-year history

Quick Wins Before Applying for a Mortgage

  1. Pay off small debts — Eliminating a $100/month payment moves your DTI
  2. Don’t take on new debt — Avoid car purchases or new credit cards
  3. Pay down credit cards to $0 — Even though you can use them after closing
  4. Don’t cosign anything — That payment counts against your DTI
  5. Ask about removing student loans — IBR payments of $0 may be excluded by some lenders

DTI Calculator Example

Here’s how different debt reduction strategies affect mortgage qualifying:

Starting point: $90,000 household income ($7,500/month), $2,900 in monthly debts, DTI = 38.7%

Action New Monthly Debts New DTI Max Mortgage Payment
Starting point $2,900 38.7% $325 (at 43% cap)
Pay off credit cards (-$200) $2,700 36.0% $525
Also pay off car (-$520) $2,180 29.1% $1,045
Also refinance student loans (-$130) $2,050 27.3% $1,175

By reducing debts from $2,900 to $2,050, the maximum affordable mortgage payment increases from $325 to $1,175 — a massive difference in home buying power.

Related: Mortgage Affordability Calculator | Mortgage Payment Calculator | Average American Debt | How Much Home Can I Afford?