Your debt-to-income ratio (DTI) is one of the most important numbers in personal finance — and most people have never calculated it. Lenders use it to decide whether to approve you for a mortgage, auto loan, or any major credit. Here's what it is, what's good, and how to fix it.
What Is DTI?
DTI is simple: it's your total monthly debt payments divided by your gross (pre-tax) monthly income.
DTI = Monthly Debt Payments ÷ Gross Monthly Income × 100
Example: You earn $5,000/month before taxes. You have a $400 car payment, $200 student loan payment, and $150 minimum on credit cards. That's $750/month in debt. $750 ÷ $5,000 = 15% DTI.
What Counts as "Debt" in DTI?
Lenders include:
- Mortgage or rent payments (or proposed mortgage payment)
- Car loans
- Student loans (even if in deferment, lenders often count 0.5–1% of the balance)
- Minimum credit card payments
- Personal loans
- Child support or alimony
They do not include utilities, insurance, groceries, subscriptions, or any non-debt expenses.
DTI Ranges and What They Mean
| DTI | What It Means | Mortgage Approval |
|---|---|---|
| Under 20% | Excellent — very low debt load | Easy approval, best rates |
| 20–35% | Good — manageable | Strong approval |
| 36–43% | Acceptable — getting tight | Approvable, rates may be higher |
| 44–50% | Concerning — limited options | May qualify with compensating factors |
| Above 50% | High risk | Most lenders won't approve |
Front-End vs Back-End DTI
Mortgage lenders actually calculate two DTI ratios:
- Front-end DTI (housing ratio): Only your proposed housing payment (mortgage + taxes + insurance) divided by gross income. Lenders like this under 28%.
- Back-end DTI (total debt): All monthly debt payments including housing divided by gross income. Lenders like this under 43%, though some go to 50% for FHA loans with strong compensating factors.
When people just say "DTI," they usually mean back-end.
How to Lower Your DTI
You have two levers: reduce debt or increase income. Here's the most effective order of operations:
- Pay off small balances completely. Eliminating a $150/month payment does more for your DTI than reducing a large balance. The payment disappearing is what moves the needle.
- Stop taking on new debt. No new car loans, no new credit cards, no new financing before a major application.
- Increase income. A side gig, raise, or second job directly lowers your DTI ratio. Even $500/month of documented income can make a difference.
- Pay down credit cards strategically. Lower balances = lower minimum payments = lower DTI (and a better credit score as a bonus).
Tip: If you're applying for a mortgage in 6 months, focus on eliminating any monthly debt payment you can. Each $100/month you eliminate effectively increases the home price you qualify for by about $15,000–$20,000.
DTI vs Credit Score — Which Matters More?
Both matter, but for different reasons. Your credit score determines your interest rate. Your DTI determines whether you can get the loan at all. You can have an 800 credit score and get denied because your DTI is 55%. Lenders need to see that your income can support the debt — a great score just shows you've managed debt well before.
Calculate Yours Right Now
Add up all your minimum monthly debt payments. Divide by your gross monthly income. Multiply by 100. If you're over 43%, that's the number to work on before applying for a mortgage.
Our home affordability calculator automatically factors in your DTI when estimating your maximum home price — just plug in your income and existing debts and it does the math.