Debt-to-Income (DTI) Ratio Calculator

What is a Debt-to-Income Ratio?

Your debt-to-income ratio (DTI) is the share of your gross monthly income that goes toward debt payments. Lenders use it, along with your credit score, to judge whether you can take on another payment. If you earn $5,000 a month before tax and pay $1,650 toward rent, a car loan and credit cards, your DTI is 33%.

Why is it important? A credit score shows how reliably you have repaid in the past; DTI shows how stretched your budget is today. A borrower with a high ratio has little room to absorb a job loss or an unexpected bill, so lenders treat a high DTI as a sign of risk. Federal rules require mortgage lenders to make a good-faith determination of your ability to repay, and DTI is central to that test.

Front-end ratio. Also called the housing ratio, it counts only housing costs: rent or the mortgage payment, property tax, homeowners insurance, mortgage insurance and HOA dues. A common guideline for conventional mortgages is no more than 28%. FHA guidelines use 31%.

Back-end ratio. This adds every other recurring debt obligation to housing costs: minimum credit card payments, student loans, auto loans, personal loans, child support and alimony. Conventional guidelines start at 36%, and many lenders go to 43% or even about 50% with automated underwriting and strong compensating factors such as large savings. FHA's benchmark is 43%. When people quote a single DTI figure, it usually means the back-end ratio, which the calculator shows first.

Lenders calculate DTI from documented figures. For income they use gross pay from pay stubs, W-2s and tax returns, and they may average variable income such as bonuses, commissions or self-employment earnings over two years. For debts they use the minimum payments on your credit report and the proposed payment on the home you are buying, not your current rent. Installment debts with only a few payments left may be excluded, and payments on a co-signed loan usually count unless you can show someone else makes them. Student loans in deferment still count, typically at the reported payment or a set percentage of the balance.

Because the ratio uses pre-tax income, it can understate how tight a budget really is: a borrower with a 36% DTI may be spending close to half of their take-home pay on debt.

Utilities, groceries, insurance premiums other than homeowners, and taxes are not counted, even though they matter to your budget.

Front-end DTI = housing costs ÷ gross income × 100 Back-end DTI = all debt payments ÷ gross income × 100

Housing costs

rent or mortgage payment, property tax, homeowners insurance and HOA dues

All debt payments

housing costs plus credit card minimums, student, auto and other loan payments

Gross income

monthly income before taxes and deductions

Everyday living costs such as groceries, utilities and phone bills are not included.

House Affordability

Lenders apply both ratios when deciding how large a mortgage you can get. With a 28/36 guideline and $5,000 of gross monthly income, your total housing payment should stay under $1,400 and all debts combined under $1,800. If you already pay $450 a month toward a car and credit cards, the back-end limit leaves $1,350 for housing, so existing debt directly reduces how much home you can buy.

Financial Health

DTI is also a useful personal check-up, whether or not you are applying for credit. As a rough guide:

A back-end ratio below about 36% usually leaves room for saving and unexpected costs. Between 36% and 43% is manageable but tight. Above 43% suggests debt is crowding out other goals, and above 50% means more than half your gross income is committed before you buy groceries.

How to Lower Debt-to-Income Ratio

Increase income. A raise, overtime, a second job or freelance work all lower the ratio, as long as lenders can document the income; they usually want a two-year history for self-employment and side income.

Budget. Tracking spending for a month often reveals money that can go toward debt. Avoid taking on new debt, especially before a mortgage application, since even a small new car payment raises your back-end ratio. Focus extra payments on debts with the highest payment relative to balance, because paying off a small loan entirely removes its payment from the calculation.

Make debt more affordable. Refinancing or consolidating high-rate debt into a loan with a lower rate or longer term reduces the monthly payment, and therefore DTI, though a longer term can raise total interest. Asking card issuers for a lower rate, or moving balances to a 0% transfer card, cuts the interest portion of each payment. Income-driven repayment plans can reduce federal student loan payments. For a home purchase, a larger down payment or a less expensive home lowers the housing ratio.

Paying down revolving balances lowers the minimum payments that count toward DTI and improves your credit utilisation at the same time, a double benefit before any loan application.

Frequently asked questions

Sources

• CFPB – What is a debt-to-income ratio?
• U.S. Department of Housing and Urban Development
• Fannie Mae – Selling Guide