What Is a Debt-to-Income Ratio?
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward paying debts. It is one of the first numbers a lender checks when you apply for a mortgage, car loan, or personal loan. A low DTI tells a lender you have room in your budget for a new payment. A high DTI signals that you may already be stretched thin.
DTI does not look at your credit score, your savings, or your spending habits - it is purely a ratio between what you owe each month and what you earn before taxes.
Front-End vs. Back-End DTI
Lenders typically calculate two versions of DTI:
- Front-end DTI (also called the housing ratio) - only includes housing costs: mortgage principal and interest, property taxes, homeowner's insurance, and HOA fees if applicable. Most conventional lenders want this below 28%.
- Back-end DTI - includes all monthly debt obligations: housing, car loans, student loans, credit card minimum payments, personal loans, child support, and any other recurring debt. This is the number most lenders focus on. The conventional limit is 36%, though FHA loans allow up to 43% and some lenders go higher with compensating factors.
When people say "DTI," they almost always mean the back-end number.
How to Calculate It
The formula is straightforward:
Gross monthly income is your income before taxes and deductions - not your take-home pay. If you are salaried, divide your annual salary by 12. If you are self-employed or have variable income, lenders typically average the last two years of tax returns.
Worked Example
Say you earn $65,000 per year. Your gross monthly income is $65,000 ÷ 12 = $5,417.
Your monthly debts are:
- Mortgage (principal + interest + taxes + insurance): $1,450
- Car loan: $385
- Student loan: $210
- Credit card minimum payment: $75
Total monthly debt: $2,120
A DTI of 39.1% sits above the ideal 36% threshold but below the 43% ceiling most lenders allow. You would likely qualify for a conventional mortgage, but you may face a slightly higher interest rate or be asked to pay down some debt before closing.
The front-end DTI in this example: $1,450 ÷ $5,417 = 26.8% - comfortably under the 28% guideline.
Use our mortgage calculator to find what a realistic monthly payment would look like for your home price and down payment, then plug it into the formula above.
What Is a Good DTI?
- Under 28% front-end / Under 36% back-end - Excellent. You will qualify for the best rates and have the widest range of loan options available.
- 36% to 43% back-end - Acceptable for most lenders. You will qualify for conventional loans, though you may face slightly higher scrutiny or rate.
- 43% to 50% back-end - Possible with FHA or VA loans, or with compensating factors like a large down payment or strong credit score.
- Above 50% - Most lenders will decline. Reducing debt before applying is the only reliable path forward.
How to Lower Your DTI
You have two levers: reduce monthly debt payments, or increase income. Here are the most practical moves:
- Pay off small balances completely. Eliminating a debt removes its minimum payment from your DTI entirely. A $75/month credit card minimum disappearing from your obligations has a bigger DTI impact than reducing a large loan by the same dollar amount.
- Avoid new debt before applying. Every new loan or credit card you open adds to your monthly obligations. If you are planning to apply for a mortgage in the next 6 to 12 months, do not finance a car, open new credit lines, or take on personal loans.
- Pay down revolving balances. Credit card minimums are typically 1 to 3% of your balance. Paying a card from $5,000 down to $1,000 cuts that monthly obligation significantly.
- Document all income sources. Lenders can count steady freelance income, rental income, or a second job if you can document it with at least two years of tax returns or pay stubs. Income you leave off the application keeps your DTI artificially high.
- Choose a less expensive property. A lower purchase price means a smaller monthly payment, which directly reduces both your front-end and back-end DTI.
If credit card debt is pushing your DTI up, our credit card payoff calculator can show you exactly how long it will take to eliminate a balance and how much interest you will save by paying more than the minimum each month.
Frequently Asked Questions
Does my DTI affect my credit score?
No - DTI is calculated by lenders from your application data and does not appear on your credit report. However, the debts that make up your DTI do affect your credit score through payment history and credit utilization. Reducing debt improves both your DTI and your score at the same time.
Do lenders use gross or net income for DTI?
Gross income - your earnings before taxes and deductions. This is standard across conventional, FHA, and VA loans. Using net pay would make DTI comparisons inconsistent across different tax situations, so lenders standardize on the pre-tax figure.
Are all monthly payments counted in DTI?
No. Only debt obligations tied to a loan or credit agreement are counted: mortgage, car loans, student loans, credit card minimums, personal loans, child support, and alimony. Regular living expenses like utilities, groceries, phone bills, and subscriptions are not included.
Can I get a mortgage with a high DTI if I have a large down payment?
Sometimes. A down payment of 20% or more is a compensating factor that some lenders weigh against a high DTI because it reduces their risk. Combined with strong credit and cash reserves, a large down payment may allow approval at a DTI up to 45% or higher. This varies significantly by lender and loan type - there is no universal rule.
How is DTI calculated differently for self-employed borrowers?
Self-employed borrowers follow the same formula, but the income figure is calculated differently. Instead of gross salary, lenders average the net income from the last two years of tax returns (Schedule C or K-1), adjusted for depreciation and other non-cash deductions. Because tax write-offs reduce taxable income, qualifying can be harder even when actual cash flow is strong. Keeping a clean two-year paper trail is critical.