The Basic Formula for Debt-to-Income Ratio
Your debt-to-income ratio is the percentage of your gross monthly income that goes toward debt payments. To calculate it, add up all your monthly debt payments and divide by your gross monthly income, then multiply by 100 to get a percentage.
The formula is: (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100 = Debt-to-Income Ratio
For example, if your gross monthly income is $4,000 and your total monthly debt payments are $1,000, your ratio is 25 percent. Lenders use this number to decide whether to lend you money and at what interest rate. Most lenders prefer to see a ratio below 43 percent, though some will go higher.
Key Takeaways
- Debt-to-income ratio is calculated by dividing your total monthly debt payments by your gross monthly income and multiplying by 100.
- Include all recurring monthly debt: mortgage or rent (if you count rent), car loans, student loans, credit cards, personal loans, and medical debt payments.
- Use your gross income before taxes, not your take-home pay, and include all income sources such as salary, self-employment income, and regular benefits.
- Most mortgage lenders want to see a ratio of 43 percent or lower, though some accept up to 50 percent depending on credit score and down payment.
- A lower ratio makes you a more attractive borrower and can help you get better interest rates on loans.
What Counts as Monthly Debt Payments
Include every debt payment you make each month. This means your mortgage or rent payment (some lenders count rent, others do not — ask your lender), car loans, student loans, credit card minimum payments, personal loans, medical debt payments, and child support or alimony if you pay either.
Do not include utilities, groceries, insurance premiums, or other living expenses — only debts. If you have a credit card with a $5,000 balance and a 5 percent minimum payment, count $250 per month, not the full balance. For student loans in deferment or forbearance, count $0 unless you are making payments.
If you have multiple credit cards, add the minimum payment on each one. If you pay more than the minimum, use the actual amount you pay each month. The goal is to show what you actually owe every month, not what you could owe.
How to Calculate Your Gross Monthly Income
Use your gross income, which is what you earn before taxes, not your take-home pay. If you are paid annually, divide your salary by 12. If you are paid biweekly, multiply your paycheck by 26 and divide by 12. If you are paid weekly, multiply by 52 and divide by 12.
Include all income sources: your primary job, a second job, self-employment income, rental income, Social Security, disability payments, child support you receive, alimony, and any other regular income. If your income varies month to month, use an average from the past two years or use a conservative estimate of what you expect to earn.
Do not include one-time bonuses, tax refunds, or money you expect to receive but have not yet. Lenders want to see income you can count on every single month. If you recently changed jobs, some lenders will average your income from the past two years to account for the transition.
Why Lenders Care About This Number
Lenders use your debt-to-income ratio to measure risk. If you already owe a large percentage of your income, you have less money left over for a new loan payment, and you are more likely to fall behind. A person with a 20 percent ratio has much more breathing room than someone at 50 percent.
Different types of loans have different thresholds. Mortgage lenders typically want to see 43 percent or lower, though some will go to 50 percent if you have a strong credit score and a large down payment. Auto lenders are often more flexible and may accept 50 percent or higher. Credit card companies and personal loan lenders may not look at this ratio at all.
Your ratio also affects the interest rate you are offered. A lower ratio signals that you manage debt responsibly, so lenders offer better rates. A higher ratio means you pay more in interest because the lender sees you as a higher risk.
Step-by-Step Calculation Example
Let's walk through a real example. Suppose you earn $60,000 per year and have the following monthly debts:
- Mortgage payment: $1,200
- Car loan: $350
- Student loan: $200
- Credit card minimum: $100
- Personal loan: $150
Step 1: Calculate gross monthly income. $60,000 ÷ 12 = $5,000.
Step 2: Add all monthly debt payments. $1,200 + $350 + $200 + $100 + $150 = $2,000.
Step 3: Divide debt by income. $2,000 ÷ $5,000 = 0.40.
Step 4: Multiply by 100 to get a percentage. 0.40 × 100 = 40 percent.
In this example, your debt-to-income ratio is 40 percent. Most mortgage lenders would view this as acceptable, though you would have less room to take on new debt before hitting the 43 percent threshold.
How to Improve Your Ratio
You can lower your ratio in two ways: pay down debt or increase income. Paying down debt is usually faster. If you paid off the $150 personal loan in the example above, your ratio would drop to 38 percent. If you paid off the credit card as well, it would drop to 37 percent.
Increasing income also works. If the person in the example got a raise that brought their annual salary to $66,000, their monthly income would be $5,500, and their ratio would drop from 40 percent to 36 percent without paying down a single dollar of debt.
If you are trying to get a mortgage or car loan, focus on paying down high-interest debt like credit cards first. Lenders care more about the ratio than the absolute amount you owe, so eliminating a few thousand dollars in credit card debt can make a real difference in whether you are approved and at what rate.
Common Mistakes When Calculating Your Ratio
The most common mistake is using take-home pay instead of gross income. Your take-home is lower because taxes have already been removed, which artificially inflates your ratio and makes you look riskier than you are. Always use the gross amount before any deductions.
Another mistake is forgetting to include all debt. Many people forget medical debt, child support, or a second car loan. If you miss a debt, your ratio will be artificially low, and you may be surprised when a lender pulls your credit report and sees the full picture.
Some people also count expenses that are not debt, like insurance or utilities. These are important for your budget, but they do not count toward your debt-to-income ratio. The ratio measures only money you owe, not money you spend.
Frequently Asked Questions
Do I include rent in my debt-to-income ratio?
It depends on the lender. Most mortgage lenders include your current rent payment when calculating your ratio, because they want to see your total housing cost. Some lenders do not. Always ask your lender whether they count rent before you calculate your ratio for a loan process.
What if my income varies every month?
Use an average from the past two years, or use a conservative estimate of what you expect to earn. If you are self-employed or work on commission, most lenders will average your income over 24 months to smooth out seasonal ups and downs. If you just started a new job, some lenders will average your old and new income.
Is a debt-to-income ratio of 50 percent bad?
It depends on the loan type and your credit score. Most mortgage lenders want 43 percent or lower, so 50 percent would likely disqualify you. Auto lenders and credit card companies are often more flexible. A high ratio does not mean you are in financial trouble — it just means you have less room to take on new debt.
Does paying off debt faster lower my ratio?
Yes. Every dollar you pay toward debt reduces your monthly debt payments, which lowers your ratio. Paying off a $200 monthly debt payment drops your ratio by 4 percent if your income is $5,000 per month. The faster you pay down debt, the faster your ratio improves.
Can I calculate my ratio before explore for a loan?
Yes. Calculating it yourself before you explore gives you a realistic picture of whether you will be approved and helps you decide whether to pay down debt first. Most lenders will pull your credit report and calculate it themselves, so doing it ahead of time lets you see what they will see.