What Is the Debt-to-Income (DTI) Ratio? What's Good and How to Calculate It

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The debt-to-income ratio (DTI) is the share of your gross monthly income that goes toward recurring monthly debt payments, expressed as a percentage. A DTI of 30% means that 30 cents of every pre-tax dollar you earn each month is already committed to debt. Lenders use it to judge whether you can take on a new payment, and a lower number is more favorable.

What DTI measures

DTI stands for debt-to-income. It is a measure of payment burden, not of total indebtedness. Two people can owe the same $30,000. If one repays it over ten years and the other over three, they will have very different ratios, because DTI looks only at the monthly payment.

Lenders apply it to mortgages, auto loans, personal loans and credit cards. Because your credit report lists your debts but not your income, DTI is not part of your credit score. A lender calculates it separately from your application, pay documentation and credit report.

Gross or net income?

The standard DTI uses gross income, meaning pay before taxes, retirement contributions and other deductions. A “debt to net income ratio” based on take-home pay is a useful personal budgeting check, but lenders’ published DTI limits assume gross income. The net-income version will always produce a higher percentage for the same debts.

How to calculate your DTI ratio

The formula:

DTI ratio = (Total monthly debt payments ÷ Gross monthly income) × 100

1. Add up every recurring monthly debt payment: housing, loans, card minimums, support obligations.
2. Find your gross monthly income. Annual salary divided by 12 works for salaried pay.
3. Divide the first figure by the second and multiply by 100.

Simple example (hypothetical): You earn $5,000 a month before taxes and pay $1,000 a month across a car loan, student loans and credit card minimums. $1,000 ÷ $5,000 = 0.20, so your DTI is 20%.

Front-end vs. back-end DTI

Mortgage underwriting often splits DTI into two figures:

• Front-end ratio (housing ratio): only housing costs, such as the mortgage principal and interest, property taxes, homeowners insurance and HOA dues, divided by gross income.
• Back-end ratio: housing costs plus all other recurring debt payments, divided by gross income. When a lender quotes a single “DTI,” it usually means this one.

A long-standing rule of thumb, often called the 28/36 rule, suggests keeping the front-end ratio at or below 28% and the back-end ratio at or below 36%. Actual lender and program limits vary.

Worked example: a mortgage application

All figures are hypothetical. They assume a borrower with $6,000 gross monthly income applying for a mortgage.

• Front-end ratio: $1,500 ÷ $6,000 = 25%
• Back-end ratio: $2,250 ÷ $6,000 = 37.5%

The housing ratio fits within a 28% guideline. The back-end ratio sits above a 36% cutoff but below the 45% ceiling described below. A lender following those guidelines might approve the loan only if the borrower meets additional criteria. Paying off the $100 in card minimums would bring the back-end ratio to about 35.8%.

The mortgage payment used here is the proposed payment on the new loan, not the borrower’s current rent. Lenders test whether you can carry the debt you are applying for.

What counts in DTI

Debts typically included

• Mortgage or rent payments, plus property taxes, homeowners or renters insurance, HOA and maintenance fees
• Credit card minimum payments (not the full balance)
• HELOC and other line-of-credit minimum payments
• Student loans, personal loans, auto loans and leases
• Loans for boats, motorcycles and RVs
• Payments on loans you have co-signed
• IRS installment agreements
• Child support, alimony and other court-ordered payments
• Time-share payments

Income typically included

• W-2 wages and tips
• Self-employment income, based on tax returns
• Pensions and other retirement income, including Social Security
• Investment income, such as rental property income and dividends
• Alimony and child support you receive
• Recurring payments, such as lottery annuity installments

What DTI leaves out

Expenses typically excluded

• Utilities (electricity, water, internet, phone)
• Insurance premiums not bundled into a mortgage payment
• Groceries, entertainment and subscriptions
• Medical bills that are not financed through a loan
• Childcare, unless it is paid through a formal loan
• Retirement contributions
• Solar panel leases, power purchase agreements and similar arrangements

Income typically excluded

• One-time windfalls, such as an inheritance or a lump-sum lottery prize
• Income from household members who are not on the loan application
• Temporary income expected to end soon
• Cash income you cannot document

The documentation point matters in practice. Income a lender cannot verify does not enter the denominator, so a borrower with undocumented side earnings will show a higher DTI on paper than in reality.

What is a good debt-to-income ratio?

A lower DTI means more of your income is free after debt payments, which lenders read as lower repayment risk. A bigger DTI means a larger share is spoken for, leaving less room to absorb a new payment or a drop in income.

General guideposts for lending:

• Up to about 35% to 36%: the range many lenders prefer. A 22% DTI, for example, falls comfortably inside it.
• 36% to 45%: often still approvable for mortgages, typically with compensating strengths.
• Up to 50%: possible for some FHA loans and some conventional loans, depending on how they are underwritten.
• Above the lender’s maximum: you are ineligible for that loan, whatever your other qualifications.

The two government-sponsored mortgage buyers set reference points that many conventional lenders follow:

• Freddie Mac: a general DTI cutoff of 36%, up to 45% in certain circumstances. Loans to borrowers above 45% are ineligible for sale to Freddie Mac.
• Fannie Mae: a general cutoff of 36%, up to 45% for borrowers meeting certain criteria, and up to 50% for loans underwritten through its automated system.

For unsecured personal loans and credit cards, limits are set by each lender and are not standardized the way conforming mortgage limits are.

A strong credit score does not change your DTI. It can, however, help offset a ratio near a lender’s limit, because approval weighs several factors together.

How to lower your DTI ratio

Because DTI is a fraction, there are only two levers: shrink the numerator (debt payments) or grow the denominator (income).

• Pay down debt. The snowball method clears the smallest balances first. The avalanche method targets the highest interest rate first and usually costs less in total interest. Eliminating a debt entirely removes its payment from the calculation. A lower balance on a card can also reduce the minimum payment.
• Avoid new debt before applying. A new car loan or financed purchase adds a payment immediately.
• Increase documented income. A raise, a better-paying job, or freelance and side income count once you can document them. Lenders may ask for an offer letter and matching pay stubs after a recent job change. A move within the same field at higher pay, following a steady work history, is generally viewed as lower risk.
• Check your credit reports for errors. Lenders pull your debts from these reports. A closed account still showing a payment, or a debt that is not yours, inflates your ratio. You can request free reports through AnnualCreditReport.com and dispute mistakes with the credit bureaus.
• Spend less. Lower spending does not change the formula directly, but it frees cash for repayment and keeps balances from growing.

Refinancing to a longer term can also lower a monthly payment, and therefore DTI, though it usually increases total interest paid. Compare the APR and total cost, not just the payment.

Limitations of DTI

• Gross income overstates spending power. Taxes vary by state and situation, so two applicants with the same DTI can have very different take-home pay left after debts.
• Living costs are ignored. Utilities, childcare, food and insurance outside the mortgage can be large but sit outside the ratio.
• Minimum payments understate card debt. A borrower carrying high balances at the minimum looks better on DTI than one paying cards in full each month.
• It is a snapshot. A ratio calculated today does not capture a variable-rate payment that may rise or income that may fall.

DTI vs. similar measures

• Loan-to-value (LTV): compares a loan amount to the value of the property securing it, so it measures collateral risk rather than payment capacity. Mortgage lenders look at both. See loan-to-value ratio.
• Credit utilization: revolving balances divided by credit limits, a credit-scoring factor that does not involve income.
• Debt service ratio: an aggregate household figure that measures debt payments against disposable (after-tax) income across the economy, not an individual’s loan eligibility.
• Debt ratio: in corporate finance, total liabilities divided by total assets, a balance-sheet measure unrelated to personal income.

FAQs

The Bottom Line

DTI matters most to anyone applying for a mortgage, auto loan, personal loan or credit card, since a ratio above a lender's maximum makes you ineligible regardless of other strengths. Many lenders prefer about 36% or less. Before applying, pay down or pay off debts, avoid new loans, document all income and check your credit reports for errors that could inflate your ratio.