Debt-to-Income Ratio Explained: What It Is and Why It Matters for Young Adults

Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward paying debts. It's a number lenders pay close attention to — and one that affects far more than just mortgages.

DTI = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100

If you make $4,000/month before taxes and your debt payments total $1,200, your DTI is 30%.

What Counts as Debt?

COUNTS: Student loans, car payments, credit card minimums, personal loan payments, mortgage payments, medical debt payments, child support.

Does NOT count: Utilities, groceries, gas, subscriptions, insurance premiums, phone bills.

What Is a Good DTI?

• Under 20% — Excellent. Low risk, best rates.
• 20–35% — Good. Solid footing, qualifies for most products at good rates.
• 36–49% — Risky. Lenders get nervous. Higher rates, harder approvals.
• 50%+ — Serious problem. More than half your income goes to debt before housing, food, and transportation.

For mortgages specifically: lenders typically want your total DTI below 43%, with housing costs under 28% of gross income.

Why Your DTI Matters Right Now

DTI affects auto loans, personal loans, rental applications, and credit card approvals — not just mortgages. A high DTI means higher rates across all these products, and it signals less financial flexibility for you personally, regardless of what lenders think.

How to Calculate Yours

List all monthly debt payments. Add them up. Divide by your gross monthly income. Multiply by 100. That's your DTI.

Example: $350 student loans + $280 car payment + $120 credit card minimums = $750. Divide by $3,500 gross monthly income = 21.4% DTI. Solid.

How to Lower Your DTI

Pay down debt strategically. Focus on accounts with the highest monthly minimums. When an account is eliminated, that minimum disappears entirely from your DTI calculation — a meaningful drop.

Don't take on new debt. Every new monthly payment increases your DTI. If you're planning a major financed purchase, get your DTI down first for better rates.

Pay credit cards in full. When you carry no balance, credit cards contribute $0 to your DTI — even if you're using them regularly.

Increase your income. A raise or side income lowers your DTI percentage even if debt stays the same.

Refinance to lower monthly payments. Refinancing a student loan or car loan at a lower rate can reduce your monthly payment and DTI. Be careful with federal student loan refinancing — you lose income-driven repayment options.

Tracking All Your Debt in One Place

To actively manage your DTI, you need visibility into every debt payment. Cash Balancer lets you track all your debts — balances, minimum payments, interest rates — and see your complete financial picture without connecting your bank accounts. When you know where you stand, you can make deliberate decisions about which debts to attack first. Download it free on iOS.

The Bottom Line

Your debt-to-income ratio is one of the most consequential financial numbers most young adults have never calculated. Now you can calculate yours in 10 minutes. If it's above 36%, make debt payoff your near-term priority. If it's under 28%, you're in great shape. Either way — know your number.