What your debt-to-income ratio is and why lenders look at it
Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. Lenders calculate it by dividing your total monthly debt payments by your gross monthly income, then multiplying by 100. A lender uses this number to decide whether you can afford a mortgage payment on top of what you already owe.
Most conventional lenders want to see a DTI of 43% or lower, though some will go to 50% if you have strong credit or a large down payment. FHA loans often accept ratios up to 50%. The lower your ratio, the more mortgage you can borrow — and the more attractive you look to a lender.
Your DTI matters because it is a straightforward measure of how stretched your budget already is. A person earning $5,000 a month with $1,500 in existing debt payments has a 30% ratio and room for a mortgage. The same person with $2,500 in existing debt has a 50% ratio and little room left, even if their credit score is perfect.
Key Takeaways
- Debt-to-income ratio is calculated by adding all your monthly debt payments and dividing by your gross monthly income before taxes.
- Most conventional lenders require a DTI of 43% or lower, though some programs accept up to 50%.
- Your ratio includes car loans, student loans, credit card minimums, and child support — but not utilities, insurance, or rent you currently pay.
- You can lower your ratio by paying down existing debt or increasing your income before you explore for a mortgage.
- The mortgage payment itself is included in the calculation, so lenders estimate what your new payment would be and add it to your existing debts.
What counts as debt in the calculation
Lenders include any monthly payment you are legally obligated to make. This includes car loans, student loans, personal loans, credit card minimum payments, child support, and alimony. If you have a credit card with a $5,000 balance and a $25 minimum payment, lenders count the $25, not the full balance.
Lenders do not count utilities, insurance premiums, rent, groceries, or other living expenses — only debt obligations. They also do not count medical debt that is in collections or has been written off, though unpaid medical debt that is still being collected may be included. If you are paying off a collection account through a payment plan, that monthly payment counts.
Student loan payments count even if you are in deferment or forbearance, because the obligation still exists. If you have federal student loans in income-driven repayment, the lender uses your actual monthly payment amount, not the standard 10-year payment.
How to gather the numbers you need
Start by finding your gross monthly income. This is your income before taxes, Social Security, or any deductions. 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 52 weeks and divide by 12. If your income varies, lenders usually average the last two years.
Next, list every monthly debt payment. Pull your credit report from annualcreditreport.com (the only free source mandated by federal law) to see what lenders have on file. Then check your own records: look at your bank statements for the last two months and list every payment you make toward debt. Include the minimum payment on credit cards, not the full balance.
For the mortgage payment itself, you will need to estimate. A lender will do this for you based on the loan amount you are seeking, current interest rates, and your down payment. If you want to calculate it yourself before meeting with a lender, use an online mortgage calculator and enter the loan amount, interest rate, and 30-year term (or whatever term you are considering).
The step-by-step calculation
Add up all your monthly debt payments. Include the minimum on every credit card, the full payment on car loans and student loans, child support, alimony, and any other loan payment. Do not include the mortgage you are about to get — you will add that separately in the next step.
Add your estimated new mortgage payment to that total. This is your total monthly debt obligations.
Divide that total by your gross monthly income. Multiply by 100 to get a percentage. That is your debt-to-income ratio.
Example: You earn $6,000 gross per month. Your current debts are: car loan ($350), student loans ($200), and credit card minimum ($75). That is $625 in existing debt. Your estimated mortgage payment is $1,500. Your total debt is $625 + $1,500 = $2,125. Divide $2,125 by $6,000 = 0.354. Multiply by 100 = 35.4% DTI.
Front-end and back-end ratios
Some lenders look at two separate ratios instead of just one overall number. The front-end ratio (also called the housing ratio) is your mortgage payment divided by your gross monthly income. Most lenders want this to be 28% or lower. The back-end ratio is your total debt payments including the mortgage divided by your gross monthly income — this is the 43% to 50% threshold most lenders use.
A lender might approve you if your back-end ratio is acceptable but your front-end ratio is too high, or vice versa. If your front-end ratio is the problem, it usually means the mortgage payment itself is too large for your income, and you may need to look at less expensive homes or put down a larger down payment to lower the monthly payment.
If your back-end ratio is the problem, it means your existing debts are eating up too much of your income. In this case, paying down credit cards or car loans before you explore can improve your chances.
How to improve your ratio before explore
The fastest way to lower your DTI is to pay down high-balance debts, especially credit cards. Paying off a credit card entirely removes both the balance and the minimum payment from the calculation. Even paying down a card from $5,000 to $2,000 can lower your minimum payment and improve your ratio.
Paying off a car loan or personal loan also helps, but these typically have fixed payments that do not drop until the loan is gone, so the impact is smaller unless you pay it off completely. Student loans are harder to move quickly, but if you have federal loans in standard repayment, switching to income-driven repayment can lower your monthly payment and improve your ratio.
Increasing your income also works. If you have a second job, bonus, or side income that you have earned consistently for at least two years, lenders will count it. Self-employment income requires two years of tax returns to verify. A raise or promotion at your current job counts when ready if you can show the new salary in writing from your employer.
Do not close credit cards after paying them down. Closing a card can actually hurt your ratio because it lowers your available credit, which can raise your overall credit utilization percentage and damage your credit score.
What happens if your ratio is too high
If your DTI is above the lender's threshold, you have a few options. You can wait and explore later after paying down debt or increasing income. You can look for a less expensive home, which lowers the estimated mortgage payment and improves your ratio. You can put down a larger down payment, which reduces the loan amount and the monthly payment.
You can also shop around. Different lenders have different thresholds. A credit union might accept a 50% ratio where a bank will not. An FHA loan allows higher ratios than a conventional loan. A VA loan (if you are may be able to access) often has more flexible DTI rules. A mortgage broker can shop multiple lenders at once and tell you which ones will work with your ratio.
Some lenders will approve you with a higher ratio if you have compensating factors — a large down payment, excellent credit, significant savings, or a stable long-term job. Ask the lender what compensating factors they consider.
Frequently Asked Questions
Does my spouse's income count if we are explore together?
Yes. If you are married and explore jointly, the lender adds both incomes together and includes both of your debts. If you are married but explore separately, only your individual income and debts count. Some couples explore separately if one spouse has high debt or lower income, though this usually means a smaller loan amount.
What if I am self-employed or have irregular income?
Lenders typically average your income over the last two years using your tax returns. If your income has grown significantly, some lenders will use a weighted average that counts recent years more heavily. If your income is declining, they may use the lower figure. Bring two years of personal and business tax returns, plus your most recent profit-and-loss statement.
Does my rent payment count toward my debt-to-income ratio?
No. Your current rent does not count in the DTI calculation because you will not be paying it once you own a home. However, if you are behind on rent or have an eviction on your record, some lenders will not work with you at all, regardless of your ratio.
Can I lower my DTI by paying off collections accounts?
Paying off a collection account does not remove it from your credit report, so it does not lower your DTI. However, it may help your credit score and show the lender you are taking responsibility. If you have an active payment plan on a collection account, that monthly payment counts toward your DTI, so paying it off in full would remove it from the calculation.
What if the lender's estimate of my mortgage payment is wrong?
The lender's estimate is based on the loan amount, interest rate, and term you are discussing. If the actual rate you receive at closing is different, your payment changes. Lock in your interest rate once you find a home you want to buy so the lender's estimate stays accurate. The final payment is calculated at closing based on your actual loan terms.