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What Is a Debt-to-Income Ratio and How Do You Calculate It?
April 30, 2026
April 30, 2026
Americans spend around 11% of their disposable income on debt repayment, according to the Federal Reserve Bank of St. Louis. And though you don’t need to be completely debt-free to qualify for a loan, having too much debt relative to your income makes you more likely to default. That's why lenders use the debt-to-income ratio to gauge how capable you are of taking on more.
Here’s what you need to know about the debt-to-income ratio, how to calculate it, and why it matters.
Your debt-to-income ratio is the percentage of your gross monthly income that goes toward paying debts. It’s calculated by adding up all your monthly debt payments and dividing them by your gross monthly income.
For example, if you bring in $5,000 a month before taxes and you're paying $1,500 toward debts, your DTI is 30% ($1,500 is 30% of $5,000)
When you apply for a mortgage, a car loan, or debt consolidation loans, lenders use this ratio to help figure out how much of your income is going toward your current debt obligations and how much more debt you can afford to take on. When your DTI is high, it’s a sign that you’re overextending yourself financially and could struggle to meet all debt obligations.
If you're applying for a mortgage, lenders will typically look at two versions of your DTI:
Higher front-end and back-end DTIs both signal a greater risk of default, so lenders generally prefer a front-end DTI of no more than 28% and a back-end DTI of 36% or lower.
To calculate your DTI, add up your minimum monthly debt payments, then divide the total by your gross monthly income.
Formula: (Monthly debt / Gross monthly income) x 100 = Debt-to-income ratio
Example: If you pay $500 on a car loan, $500 in student loans, and $1,500 on mortgage payments, your total monthly debt is $2,500. With a gross monthly income of $5,000, your DTI is about 50% — higher than most lenders want to see.
A couple of things to keep in mind when running the numbers:
Recurring monthly payments that do count toward your DTI include:
As a general rule, lenders prefer a back-end DTI at or below 36%. That's widely considered the sweet spot since it shows that you have enough income to comfortably cover your debts.
You can still qualify for most loans with a DTI up to 43%, which is the standard ceiling for a qualified mortgage under federal guidelines. But once your DTI goes above 36%, you may face higher interest rates, stricter requirements, or rejection.
Having a good debt-to-income ratio is more important than many people realize, especially when it comes to buying a home.
DTI is the number one reason buyers get denied or downsized in this market. I always start the DTI conversation three to six months before clients want to buy, which gives them enough runway to make real, measurable changes.” In other words, don't wait until you're ready to borrow to think about your DTI. By then, there's not much difference you can make in a short window.
Your DTI directly impacts your borrowing power, loan approvals, and interest rates, and the data backs this up. According to the 2024 National Association of REALTORS® Home Buyers and Sellers Generational Trends report, 48% of prospective buyers who were denied a mortgage were turned down due to a higher-than-acceptable DTI. To put that in perspective, a low credit score, which is what most people worry about, accounts for only 23%.
Here's what a high DTI can mean for you:
Lowering your DTI isn't complicated, since there are really only two ways to do it. You either reduce your debt or add more income. Ideally, you work on both at the same time.
Though making extra payments on installment loans, such as auto loans or student loans, reduces your outstanding debt balance, “it doesn’t change the required fixed monthly payment, so it has no impact on DTI,” explains Denya Macaluso, CMB, Vice President of Residential Lending at MSU Federal Credit Union.
Instead, she suggests focusing on paying down revolving debt instead. “The one move that most effectively lowers DTI quickly is paying down revolving debt to reduce the required monthly payment,” she said. For example, when you have a lower balance on your credit cards, it will directly reduce your monthly obligations, which immediately improves your DTI.
And you don't have to wait for your next credit report cycle to reflect those changes. “In many cases, you can ask your lender to request a rapid re-score, allowing the updated balances and lower payments to reflect on the credit report within a day,” she added. This option can come in handy when you're trying to qualify before a rate lock expires or a purchase contract deadline hits.
A higher salary directly improves your DTI ratio without requiring you to pay off a single dollar of debt. What won't work, though, at least not right away, is picking up a part-time job right before you apply.
"Most lenders require a two-year history of consistent part-time income before it can be counted, so it rarely helps in the short term," Macaluso explains. This means that if you start a weekend job three months before applying for a mortgage, that income likely won't factor into the lender's calculation at all.
But even though a second job or side hustle may not count towards qualifying income immediately, you can still use that money to pay down debts or save up for a bigger down payment, which can both improve your odds of mortgage approval.
Your DTI is one of the most important numbers lenders look at when you apply for a loan, and it deserves just as much attention as your credit score. The good news is that it's within your control.
Whether you focus on paying down revolving debt, growing your income, or both, improving your DTI before you apply can make a real difference in what you qualify for and the terms you're offered.
What is the debt-to-income ratio?
The debt-to-income ratio is the percentage of the gross monthly income you use for monthly debt payments, and it’s one way lenders measure your ability to repay the money you plan to borrow.
How do I calculate my debt-to-income ratio?
The debt-to-income ratio is calculated by dividing your monthly debt payments by your gross monthly income. Let’s say you pay $1,000 a month for your mortgage and $500 a month for the rest of your debts. Your total monthly debt payments are $1,500. If your gross monthly income is $4,500, then your debt-to-income ratio is 33%. ($1,500 is 33% of $4,500.)
What is a good debt-to-income ratio?
Lenders generally prefer a DTI ratio of no more than 36%, but the cutoff can sometimes be as high as 50%, depending on the type of loan you’re applying for.
Can my debt-to-income ratio affect my credit score?
No, your debt-to-income ratio won’t directly affect your credit score since credit bureaus don’t include income data in their calculations. That said, high debt levels can indirectly lower your FICO score by increasing your credit utilization, which accounts for 30% of your credit score.
What’s the difference between debt-to-limit and debt-to-income ratios?
Debt-to-limit, or credit utilization, measures how much of your available credit you’re using. Debt-to-income compares your monthly debt payments to your income, and lenders use it to decide if you can afford new loans.
How do you lower your debt-to-income ratio?
The most straightforward ways to lower your DTI are by either increasing your income or paying down debt.
Jamela Adam is a Financial Copywriter specializing in content for fintechs, finance SaaS companies, and wealth management brands. She earned her BBA from the University of Southern California and is a Certified Financial Education Instructor. With over 4 years of experience writing for Forbes, Investopedia, Yahoo Finance, and U.S. News, her work focuses on creating SEO-optimized content and high-converting campaigns that help financial services companies attract leads and build trust.
