Your debt-to-income ratio, or DTI, is one of the most important numbers lenders look at when you apply for a mortgage, car loan, or personal loan. A high DTI can get you rejected even if your credit score is excellent. Here is what it means and how to improve it.
What Is Debt-to-Income Ratio?
DTI measures how much of your monthly gross income goes toward debt payments. Lenders use it to judge whether you can afford to take on more debt.
The formula is simple:
DTI = Total Monthly Debt Payments / Gross Monthly Income x 100
If you earn $6,000 per month before taxes and pay $1,800 toward debt each month, your DTI is 30%.
What Counts as Debt in the Calculation?
DTI includes all recurring monthly debt obligations that show on your credit report or that lenders verify:
- Minimum credit card payments
- Car loans
- Student loans
- Personal loans
- Child support and alimony
- The new mortgage payment you are applying for (for home loans)
DTI does not include utilities, groceries, insurance, or subscriptions. It is strictly debt payments.
Front-End vs. Back-End DTI
Mortgage lenders look at two versions of DTI:
Front-end DTI includes only housing costs: your mortgage principal and interest, property taxes, homeowners insurance, and any HOA fees. Lenders typically want this below 28%.
Back-end DTI includes all monthly debt obligations, including the housing payment. This is the number most lenders focus on. The limit is usually 36% to 43%, though some loan programs allow higher.
DTI Limits by Loan Type
Conventional loans: Most require a back-end DTI of 43% or below. Fannie Mae’s automated underwriting system can approve DTIs up to 50% for borrowers with strong compensating factors like a large down payment or significant cash reserves.
FHA loans: FHA allows back-end DTI up to 50% in many cases, making these loans more accessible to borrowers with higher debt loads.
VA loans: The VA does not set a hard DTI cap but uses a residual income test. Most VA lenders prefer DTI under 41%.
USDA loans: Generally require DTI under 41%, though exceptions exist.
Personal loans and auto loans: Lenders vary widely. Most prefer DTI under 36%. Above 43%, you will face higher rates or outright denials at many lenders.
Why DTI Matters More Than You Think
Your credit score reflects how reliably you pay existing debt. DTI reflects whether you can afford to take on new debt. A borrower with a 750 credit score and a 48% DTI is a riskier bet than one with a 720 score and a 30% DTI, because the first borrower has very little income left over after debt payments.
DTI also affects your interest rate. Even when lenders approve a high-DTI borrower, they often charge a higher rate to compensate for the added risk.
How to Calculate Your DTI
Add up your minimum monthly payments on all debts. Use the minimum payment shown on your statement, not what you actually pay. Divide by your gross monthly income (before taxes and deductions). Multiply by 100.
Example: $500 car payment + $300 student loan + $200 minimum credit card payments = $1,000 in monthly debt payments. $1,000 / $5,000 gross monthly income = 20% DTI.
How to Lower Your DTI
There are two ways to improve DTI: reduce debt or increase income.
Pay Down Debt
Focus on paying off smaller debts completely to eliminate those monthly payments. Paying down a credit card balance reduces your minimum payment, which lowers DTI. For mortgage applications, eliminating even a small car payment can make a meaningful difference.
Avoid New Debt Before Applying
Do not take out a new car loan, open a new credit card, or finance furniture right before applying for a mortgage. Each new debt payment raises your DTI and can sink an otherwise strong application.
Increase Income
Lenders count all verifiable income: salary, self-employment income, rental income, regular overtime, bonuses (with a two-year history), and Social Security. If you have income you are not counting, make sure it shows on your tax returns and bank statements.
Ask Someone to Pay Off Debt as a Gift
For mortgage applicants, a family member paying off a car loan or credit card on your behalf can significantly lower DTI. The funds need to be documented as a gift, not a loan.
DTI vs. Credit Score: Which Matters More?
Both matter, but they serve different purposes. Your credit score tells lenders you are responsible with debt. Your DTI tells lenders you can afford more debt. You need both to qualify for the best rates on a mortgage.
If your credit score is strong but your DTI is high, work on paying down debt before applying. If your DTI is fine but your score is low, focus on on-time payments and reducing credit utilization.
What Is a Good DTI?
- Under 20%: Excellent. You will qualify for nearly any loan at favorable terms.
- 20% to 36%: Good. Most lenders view this favorably.
- 37% to 43%: Acceptable for many loan programs, but you may face scrutiny.
- 44% to 50%: High. Some programs allow this, but expect higher rates and stricter requirements.
- Above 50%: Most conventional lenders will decline the application.