What DTI Means and Why Lenders Use It

Debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. Lenders calculate it by adding up all your monthly debt obligations—mortgage, car loans, credit cards, student loans, personal loans—and dividing that total by your gross monthly income before taxes.

Lenders use DTI because it shows them how much of your paycheck is already spoken for. A person earning $5,000 a month with $1,000 in debt payments has a 20% DTI. The same person with $2,500 in debt payments has a 50% DTI. The second person has less room in their budget for a new loan, even though they earn the same amount.

Different types of loans have different DTI limits. Mortgage lenders often want to see 43% or lower. Auto lenders may accept 50%. Credit card companies may not check DTI at all. These thresholds vary by lender and by the type of loan you are seeking.

Key Takeaways

  • DTI is calculated by dividing your total monthly debt payments by your gross monthly income, then multiplying by 100 to get a percentage.
  • Gross income means your pay before taxes and deductions, including salary, bonuses, rental income, and child support you receive.
  • Monthly debt payments include mortgage or rent (for some lenders), car loans, credit cards, student loans, and any other regular loan payments.
  • Most mortgage lenders want a DTI of 43% or lower, but the threshold varies by lender type and loan product.
  • You can lower your DTI by paying down debt, increasing your income, or both.

The Formula and How to Calculate It Yourself

The DTI formula is straightforward: Total Monthly Debt Payments ÷ Gross Monthly Income × 100 = DTI Percentage.

Start by listing every debt payment you make each month. Include your mortgage payment or rent (some lenders count rent, others do not), car loan payments, minimum credit card payments, student loan payments, personal loan payments, and any other regular loan obligations. Do not include utilities, groceries, insurance premiums, or childcare—only debt.

Next, find your gross monthly income. If you are salaried, divide your annual salary by 12. If you are paid hourly, multiply your hourly rate by the number of hours you typically work per week, then multiply by 4.33 (the average number of weeks per month). Include bonuses, overtime, rental income, child support you receive, and any other regular income. Do not subtract taxes, health insurance, or retirement contributions.

Divide your total monthly debt by your gross monthly income, then multiply by 100. If your monthly debts are $1,200 and your gross monthly income is $4,000, your DTI is 30%.

What Counts as Debt and What Does Not

Lenders count regular, recurring debt obligations. This includes mortgage payments, car loans, student loans, personal loans, and the minimum payment on credit cards. If you have multiple credit cards, add up the minimum payment on each one, not the full balance.

Some lenders include rent payments in DTI calculations; others do not. If you are explore for a mortgage, most lenders will not count your current rent payment because they assume you will stop paying it once you own a home. If you are explore for a car loan or credit card, some lenders may count rent. Always ask the lender whether they include rent.

Lenders do not count utilities, groceries, insurance premiums, childcare, medical bills, or one-time expenses. They also do not count debts that will be paid off within a few months, though some lenders may count them if the payoff date is more than a few months away. Child support and alimony payments do count as debt.

Medical debt in collections may or may not count, depending on the lender and whether it has been paid. Ask your lender directly if you have collections accounts or medical debt.

How Different Lenders Use DTI

Mortgage lenders typically use two DTI numbers: the front-end ratio and the back-end ratio. The front-end ratio is your new mortgage payment divided by your gross monthly income—this shows how much of your income will go to housing alone. Most mortgage lenders want this at 28% or lower. The back-end ratio is your total debt (including the new mortgage) divided by gross income; most lenders want this at 43% or lower.

Auto lenders often accept higher DTI ratios, sometimes up to 50%, because car loans are secured by the vehicle itself. If you stop paying, the lender can repossess the car. Credit card companies may not calculate DTI at all; they may instead look at your credit score and recent payment history.

Personal loan lenders vary widely. Some use DTI, others do not. Some may accept a DTI of 50% or higher if your credit score is strong. Student loan servicers do not typically use DTI when you first borrow, but the government may consider DTI when you explore for income-driven repayment plans.

Why Your DTI Might Be Higher Than You Think

Many people underestimate their DTI because they forget to include all their debts. If you have a car loan, a student loan, and two credit cards, you need to add all four minimum payments together. A credit card with a $5,000 balance and a 20% interest rate might have a minimum payment of $100 or more per month, even if you are not using the card anymore.

Another common mistake is using net income instead of gross income. Your take-home pay is lower than your gross pay because taxes and deductions come out. Lenders use gross income because it is verifiable on tax returns and pay stubs. If you earn $60,000 a year, your gross monthly income is $5,000, not the $3,200 you might actually deposit into your bank account.

If you are self-employed or have irregular income, lenders typically average your income over the past two years. If you just started a business or changed jobs, your average income may be lower than your current monthly earnings, which can raise your DTI calculation.

Steps to Lower Your DTI Before explore for a Loan

The fastest way to lower your DTI is to pay down debt. Paying off a credit card entirely removes that minimum payment from your calculation. Paying off a car loan or personal loan also removes that payment. Even paying down a credit card balance by half can lower your minimum payment and improve your ratio.

If you have the opportunity to increase your income before explore for a loan, that also lowers your DTI. A raise, a second job, or rental income all count as gross income. If you can document the income increase on recent pay stubs or tax returns, lenders will count it.

Avoid taking on new debt in the months before you explore for a major loan. A new car loan or credit card will raise your DTI and may disqualify you. Even a small personal loan or store credit card can push you over a lender's threshold.

If your DTI is too high and you cannot lower it quickly, you may need to wait, explore with a co-borrower who has lower debt, or look for a lender with higher DTI limits. Some lenders specialize in borrowers with higher DTI ratios, though they may charge higher interest rates.

Frequently Asked Questions

Does my spouse's income count toward my DTI if we file taxes jointly?

It depends on the lender and the loan type. For a mortgage, if you are both on the loan, both incomes and both debts count. If only one spouse is explore, only that person's income and debts count, even if you file taxes jointly. Ask your lender which scenario applies to your situation.

What if I have a debt that is about to be paid off?

If the debt will be paid off within a few months, some lenders will not count the payment. Others will count it if the payoff date is more than 60 or 90 days away. Check with your lender. If they do count it, paying it off before you explore will lower your DTI.

Can I lower my DTI by paying off a credit card right before I explore?

Yes, but only if you close the account or keep the balance at zero. If you pay off a credit card and then use it again, the balance will show up on your credit report and lenders may count the available credit as potential debt. The safest approach is to pay down debt several months before explore, so the lower balances show up on multiple credit reports.

What is a good DTI ratio?

For mortgages, 43% or lower is generally considered acceptable by most lenders. Below 36% is considered good. Below 20% is excellent. For other loans, thresholds vary. Auto lenders may accept 50%. The lower your DTI, the more likely you are to be approved and the better your interest rate may be.

Do student loans count toward DTI even if they are in deferment?

Yes. Even if you are not currently making payments because your loans are in deferment or forbearance, lenders typically count an estimated payment based on your loan balance. Once your deferment ends, you will owe that payment, so lenders include it in their calculation.