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
- Pay off small debts — Eliminating a $100/month payment moves your DTI
- Don’t take on new debt — Avoid car purchases or new credit cards
- Pay down credit cards to $0 — Even though you can use them after closing
- Don’t cosign anything — That payment counts against your DTI
- 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?