DTI compares what you owe each month to what you earn. Lenders lean on it heavily because it's one of the clearest signals of repayment risk they have. Federal Reserve research on more than 30 million home-purchase applications found denial rates climb sharply once DTI crosses 50%, and jump above 80% past 60% (Federal Reserve Bank of St. Louis, 2026).
This article breaks down how DTI is calculated, what counts as "good" by loan type, and practical ways to lower yours. ClearPoint Mortgage Advisors works with buyers who want to understand their numbers clearly before they submit an application.
Key Takeaways
- DTI is a core mortgage qualification factor that compares monthly debt to gross monthly income
- Most lenders want back-end DTI under 36%, though limits vary by loan program
- Lower a high DTI by paying down debt, raising income, or adding a co-borrower
What Is Debt-to-Income Ratio?
Debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments, including the mortgage payment you're applying for. The Consumer Financial Protection Bureau defines it simply: total monthly debt divided by gross monthly income.
There are two versions lenders look at:
- Front-end DTI: housing costs only (principal, interest, taxes, insurance, HOA fees)
- Back-end DTI: housing costs plus every other recurring debt
When people say "DTI" without qualifying it, they usually mean back-end.
What Counts as Debt (and What Doesn't)
Lenders include:
- Mortgage or rent payment
- Car loans
- Student loans
- Minimum credit card payments
- Child support or alimony
Lenders exclude:
- Groceries
- Utilities
- Insurance premiums (outside housing costs)
- Cell phone or internet bills
Why DTI Matters for Homebuyers
DTI isn't a binary pass/fail switch. According to the same Federal Reserve analysis, denial rates stayed relatively flat between 8-10% across the 20%-50% DTI range. There was no sharp cutoff at the commonly cited 43% mark (Federal Reserve Bank of St. Louis, 2026). The real threshold effect shows up closer to 50%.
That doesn't mean DTI is harmless below 50%. It still shapes:
- Whether you're approved at all
- The interest rate you're offered
- The loan amount you qualify for
A higher DTI signals thinner monthly breathing room, and lenders price that risk into your rate even when they approve the loan.
How to Calculate Your Debt-to-Income Ratio
Calculating DTI takes three steps.
- Find your gross monthly income. Use pay before taxes and deductions. If you earn $70,000 a year, that's about $5,833 per month. Add documented overtime, bonuses, or side income your lender will count.
- Total your monthly debt obligations. Include the new mortgage payment you're seeking, not just current debts. Add car loans, student loans, minimum credit card payments, and other recurring obligations.
- Divide debt by income, then multiply by 100. The result is your DTI percentage.
Worked Example
Say your gross monthly income is $6,000. Your projected mortgage payment (principal, interest, taxes, insurance) is $1,600. You also carry a $300 car payment and $150 in minimum credit card payments.
- Front-end DTI (housing costs only): $1,600 / $6,000 = 27%
- Back-end DTI (all monthly debts): ($1,600 + $300 + $150) / $6,000 = 34%
The most common mistake: forgetting to include the estimated new mortgage payment in the calculation. Borrowers often calculate DTI using only their existing debts, then get surprised when the lender's number comes back much higher.
What Is a Good DTI Ratio for a Home Loan?
A back-end DTI below 36% (with front-end under 28%) is the ideal target for most borrowers. This is the classic 28/36 rule: no more than 28% of gross income toward housing, no more than 36% toward total debt.
But actual limits vary by loan type:
| Loan Type | Front-End | Back-End | Notes |
|---|---|---|---|
| Conventional (Fannie Mae) | No fixed cap | 36% manual; up to 45–50% automated | Exceptions for cash-out refi, non-occupant co-borrowers |
| FHA | 31% baseline; up to 40% with factors | 43% baseline; up to 50% with factors | Below 580 credit, capped at 31/43 |
| VA | No fixed cap | 41% guide, not a hard cutoff | Residual income can override the ratio |
| USDA | 29%; waiver to 32% | 41%; waiver to 44% | Waiver requires 680+ credit score |
Is 43% DTI Too High?
Not necessarily. It's within FHA's baseline range and manageable for many borrowers, especially with strong credit or cash reserves. It exceeds the conventional loan ideal, though, so you'll want stronger compensating factors to offset it on that side.
Compensating factors that can push approval above standard thresholds:
- Large down payment that lowers lender risk
- Significant cash reserves after closing
- Strong credit score above program minimums
- Stable, well-documented income history
How to Lower a High Debt-to-Income Ratio
If your DTI is running hot, you have real levers to pull.
- Pay down high-interest debt first. Credit cards drag DTI the most: lenders count the minimum payment, and high balances keep that number elevated while principal shrinks slowly if you only pay the minimum. Attack revolving balances before installment loans.
- Avoid new debt during the application process. Don't finance a car or open a new credit card while your mortgage is in underwriting. It can tank your approval at the worst possible moment.
- Add a co-signer or co-borrower. A co-borrower with strong income and credit can lower combined DTI, since lenders count both incomes and monthly debts together.
- Document additional income. Side work, freelance income, or a second job can help, but only if you can document it in a way your lender's program accepts.
- Talk to a mortgage advisor. ClearPoint Mortgage Advisors can walk through your numbers and pinpoint which lever fits your situation and loan program.
DTI and Home Equity Loans or HELOCs
Home equity loans and HELOCs carry their own DTI requirements, and they're often a bit more flexible than a first mortgage. Published benchmarks generally fall between 43% and 50%, though they vary by lender (NerdWallet, 2026).
Before you apply, keep these factors in mind:
- Opening a HELOC affects future DTI. Even if you don't draw the full line, some lenders factor a percentage of the available balance into your DTI on later loan applications.
- Credit score requirements often run 620-680+. A 650 score can still qualify if your DTI is favorable and you have strong home equity.
- Requirements vary widely by lender. Beyond the usual 43–50% band, some underwriters cap DTI near 36%, while more flexible ones may stretch to 55%.
ClearPoint Mortgage Advisors offers home equity loans and HELOCs and can help you see how a new payment would affect your DTI, whether you're consolidating debt, funding improvements, or tapping equity for other goals.
Frequently Asked Questions
What is a good debt-to-income ratio to qualify for a home?
Under 36% back-end DTI is ideal. That said, limits up to 43-50% can be accepted depending on the loan type and your compensating factors.
How much of a mortgage can I afford if I make $70,000 a year?
Using the 28% front-end guideline, $70,000 a year equals about $5,833 monthly, so housing costs around $1,633 per month become your rough ceiling. That figure includes taxes and insurance, not just principal and interest.
How can I get a loan if my debt-to-income ratio is too high?
Pay down existing debt, add a co-signer, increase your down payment, or explore FHA or VA loans, which allow higher DTI thresholds than conventional financing.
Is a 43% DTI too high?
A 43% DTI is within FHA guidelines and manageable for many borrowers with good credit or reserves. It exceeds the conventional loan ideal, though, so expect closer scrutiny on that side.
Can I get a HELOC with a high debt-to-income ratio?
Most HELOC lenders cap DTI around 43-50%. If you're above that, paying down debt first or seeking a lender with more flexible requirements may help.
Can I get a HELOC with a 650 credit score?
Yes, a 650 score can qualify with some lenders, particularly with sufficient home equity and a favorable DTI. Terms may be less favorable than for higher-credit borrowers.
