Debt-to-Income Ratio: How to Calculate It and How Lenders Use It

By CreditMeadow Editorial Team · Updated October 16, 2026

Your debt-to-income ratio (DTI) is the share of your gross monthly income that goes to debt payments. The Consumer Financial Protection Bureau defines it as all your monthly debt payments divided by your gross monthly income, and calls it one way lenders measure your ability to manage the payments on money you plan to borrow. This guide shows how to calculate both versions of the ratio, works through an example, and explains what lenders actually do with the number.

What a debt-to-income ratio measures

DTI compares two monthly figures:

• Debt payments: what you are required to pay each month on loans, cards and similar obligations
• Gross monthly income: generally what you earn before taxes and other deductions are taken out

The CFPB's own example: if you pay $1,500 a month for your mortgage, $100 for an auto loan and $400 for the rest of your debts, your monthly debt payments are $2,000. With a gross monthly income of $6,000, your DTI is 33%.

Because the ratio uses payments, not balances, two people who owe the same amount can have very different ratios. A $9,000 balance on a card with a small minimum payment adds less to DTI than a $9,000 car loan with a $420 monthly payment.

Front-end vs back-end DTI

For mortgages in particular, it helps to look at DTI two ways:

A Federal Reserve research note on mortgage rules uses the same split: it refers to the borrower's total, or "back-end," DTI, and to a "front-end" ratio that leaves out non-mortgage debt payments.

For the housing payment, use the full monthly cost, not just the loan. The CFPB's homebuying guide says a total monthly home payment includes mortgage principal, interest, property taxes, mortgage insurance, homeowner's insurance, supplementary insurance such as flood insurance, and homeowners' association fees.

For the back-end ratio, federal mortgage rules give a useful list. Under Regulation Z, a mortgage lender's total monthly debt obligations include the payment on the new loan, any simultaneous loans on the same property, mortgage-related obligations, and your current debt obligations, alimony and child support. Examples of current debt obligations include student loans, auto loans, revolving debt such as credit cards, and existing mortgages that won't be paid off at closing.

Groceries, utilities and other living costs aren't debt payments, so they don't appear in the ratio. They still have to fit in your budget, which is why the CFPB has cautioned that a lender's willingness to lend you a certain amount doesn't mean the loan is right for you.

How to calculate your debt-to-income ratio

1. Find your gross monthly income. Divide annual pay by 12. If you're paid every two weeks, multiply one gross paycheck by 26 and divide by 12.
2. List your monthly debt payments. Include housing (or the proposed housing payment if you're applying for a mortgage), car loans, student loans, personal loans, and alimony or child support you pay. In the example below, each credit card counts at the minimum payment shown on its statement.
3. Calculate the front-end ratio. Divide the housing payment by gross monthly income and multiply by 100.
4. Calculate the back-end ratio. Divide total monthly debt payments by gross monthly income and multiply by 100.

Worked example

Suppose you earn $78,000 a year before taxes, or $6,500 a month; a $3,000 gross paycheck every two weeks comes to the same $6,500 ($3,000 × 26 ÷ 12). You're applying for a mortgage, and your monthly payments would be:

• Front-end ratio: $1,750 ÷ $6,500 = 26.92%
• Back-end ratio: $2,565 ÷ $6,500 = 39.46%

Regulation Z also describes a second measure, residual income: what remains after subtracting total monthly debt obligations from total monthly income. Here that is $6,500 − $2,565 = $3,935 a month.

Small changes move the back-end ratio noticeably:

At this income, every $100 of monthly payments is worth 1.54 percentage points of DTI.

Common mistakes when calculating DTI

• Using take-home pay. The ratio uses gross income, before taxes and other deductions. Plugging in net pay shrinks the denominator and makes your ratio look worse than a lender's calculation.
• Counting balances instead of payments. Only the required monthly payment goes into the ratio.
• Leaving out part of the housing cost. Property taxes, insurance and association fees belong in the housing payment, not just principal and interest.
• Forgetting alimony or child support. Federal mortgage rules count them as monthly obligations, and they may not show up on your credit report.
• Treating one lender's limit as universal. Limits differ by loan product and lender.

How lenders use your DTI

There is no single DTI cutoff. The CFPB notes that different loan products and lenders have different DTI limits. Mortgages show how the rules leave room for judgment:

• Ability to repay. Under Regulation Z, a mortgage lender must consider your monthly DTI or your residual income, along with your income or assets, debts, and other factors. The rule does not set a specific DTI that lenders must use; the threshold is for the lender to determine as part of a reasonable, good-faith judgment about whether you can repay.
• Compensating factors. A lender may decide you can repay despite a higher DTI, for example because of savings or other assets, or because of your residual income.
• Verification. A credit report generally counts as a reliable record for verifying your debts, but some obligations, such as alimony or child support, may not appear on it.

You may still hear "43%" mentioned. For one category of qualified mortgages, known as General QMs, the total DTI could not exceed 43%. A CFPB final rule issued in December 2020 removed that 43% limit from the General QM definition and replaced it with price-based thresholds. Treat 43% as a former rule for one type of mortgage, not a universal standard.

The Federal Reserve note mentioned above also shows how context-specific any number is: studying 2014 mortgage data, its authors treated an estimated front-end ratio above 28% as "high DTI," and they note that 28% was the 90th percentile of that year's estimates. That was a research yardstick for one dataset, not a lending limit.

For other loans, limits vary by product and lender, so ask each one how it counts your debts and income.

How to lower your debt-to-income ratio

Since DTI is built on monthly payments, the fastest gains come from eliminating a payment entirely or from raising income:

• Pay off a debt with a high payment relative to its balance. In the example, clearing the car loan cut the ratio by 6.46 points. A debt payoff plan such as the debt snowball vs avalanche frees up whole payments one at a time.
• Pay down card balances. Lower balances can mean lower minimums, and our guide on how to get out of credit card debt shows how a fixed payment speeds that up.
• Avoid new debt before you apply. Every new monthly payment raises the ratio.
• Be careful with consolidation. A consolidation loan can lower your monthly payment, but the CFPB warns that a lower payment may come from a longer term that costs more overall. Compare the options in debt consolidation loan vs balance transfer first.

Before you apply for a large loan, run the calculation with your own numbers, then ask the lender which payments it will count and whether it also looks at residual income.