Debt-to-Income Ratio (DTI): How to Calculate It and What Lenders Want
For example, if you earn $6,000/month before taxes and pay $1,800/month in total debt obligations, your DTI is 30%. That number tells lenders how much of your income is already spoken for — and how much room you have for a new payment.
Front-End vs. Back-End DTI
Mortgage lenders evaluate two versions of DTI:
| Type | What It Includes | Typical Max for Conventional Mortgages |
|---|---|---|
| Front-end DTI (housing ratio) | Mortgage payment (principal + interest + taxes + insurance) | 28% |
| Back-end DTI (total DTI) | All monthly debt payments including housing | 36%–43% |
When people refer to “DTI” without qualification, they usually mean back-end DTI — your total debt load relative to income.
How to Calculate Your DTI
Step 1: Add up all monthly debt payments. Include mortgage or rent, car loans, student loans, minimum credit card payments, personal loans, child support, and any other recurring obligations. Do not include utilities, insurance premiums (unless bundled in your mortgage payment), groceries, or subscriptions — those aren’t debt.
Step 2: Determine your gross monthly income. This is your pre-tax income from all sources: salary, freelance income, rental income, alimony received, and investment income. Use the amount before deductions.
Step 3: Divide and multiply by 100.
| Monthly Debt Payment | Amount |
|---|---|
| Mortgage (PITI) | $1,400 |
| Auto loan | $350 |
| Student loans | $250 |
| Credit card minimums | $100 |
| Total monthly debt | $2,100 |
| Gross monthly income | $7,000 |
| DTI | 30% |
What’s a Good Debt-to-Income Ratio?
| DTI Range | Assessment | Lending Impact |
|---|---|---|
| Under 20% | Excellent | Strong position; maximum flexibility for new borrowing |
| 20%–35% | Healthy | Manageable debt load; qualifies for most loan products |
| 36%–43% | Moderate | Approaching limits; may face higher rates or stricter terms |
| 44%–50% | Stretched | Difficult to qualify for conventional mortgages; limited options |
| Over 50% | High risk | Most lenders will decline; financial stress is likely |
How to Lower Your DTI
You have two levers: reduce debt payments or increase income. In practice, the fastest moves are paying off smaller debts entirely (especially credit cards and auto loans), refinancing to lower monthly payments, avoiding new debt before applying for a mortgage, and increasing income through raises, side work, or adding a co-borrower.
One important nuance: paying down a credit card balance lowers your DTI immediately (the minimum payment drops). Paying extra on a fixed installment loan like a car or student loan doesn’t change the monthly payment — you’d need to refinance to realize a lower payment.
DTI vs. Credit Score
These measure different things and lenders evaluate both. Your credit score reflects how well you’ve managed past obligations (payment history, utilization, length of history). Your DTI measures your current capacity to handle more debt. You can have a perfect 800 credit score and still be denied a mortgage if your DTI is too high — and vice versa.
Key Takeaways
- DTI = total monthly debt payments ÷ gross monthly income. It measures how much of your income is committed to debt.
- Most mortgage lenders require a back-end DTI of 43% or less; under 36% is ideal.
- DTI and credit score are evaluated together — a strong score doesn’t compensate for an overloaded DTI.
- Lower your DTI by paying off debts, refinancing for lower payments, or increasing income.
Frequently Asked Questions
Does rent count in my debt-to-income ratio?
Current rent is generally not included in DTI for mortgage qualification purposes — the lender replaces it with your projected mortgage payment. However, if you’ll be keeping both (e.g., buying an investment property while still renting), both payments count.
Does DTI affect my credit score?
No. DTI is not reported to credit bureaus and has no direct impact on your credit score. However, the underlying debts that create a high DTI (credit card balances, loan payments) do affect your score through utilization and payment history.
What’s included in the mortgage payment for front-end DTI?
Lenders use PITI: principal, interest, property taxes, and homeowner’s insurance. If applicable, it also includes mortgage insurance (PMI), HOA dues, and any special assessments.
Can I get a mortgage with a DTI over 43%?
It’s possible but harder. FHA loans allow DTIs up to 50% in some cases. VA loans don’t have a hard DTI cap but use residual income analysis instead. Non-QM lenders may also work with higher DTIs at a cost — expect higher interest rates and stricter requirements.