Debt-to-Income Ratio Calculator

Barbara Marquand
By Barbara Marquand 
Updated
Edited by Dawnielle Robinson-Walker Reviewed by Michelle Blackford

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Your debt-to-income ratio, or DTI, plays a big role in how much you can borrow and whether you qualify for a mortgage.

DTI is the percentage of your pretax, or gross income, that goes toward paying debt each month, including a projected mortgage payment if you're applying for a home loan.

Calculate your debt-to-income ratio

Maximum debt-to-income ratio to buy a house

Lenders consider two types of ratios — a front-end DTI and a back-end DTI. The front-end DTI is your projected mortgage payment divided by your gross, or pretax, income. The back-end DTI is your projected mortgage payment, plus all your other monthly debt payments, divided by your gross income.

The DTI calculator gives a figure for the back-end DTI, which gives a fuller financial picture.

An ideal back-end DTI is under 36%. It's possible to qualify for a mortgage with a higher DTI, but you'll likely pay more interest, and your options for qualifying will dwindle with a DTI approaching 50% or more.

How debt-to-income ratio is calculated

Here's the formula for calculating DTI:

Your monthly debt payments / Your monthly gross, or pretax income = DTI

Debts that are included in DTI

Monthly payments for the following are included in the calculation when you're applying for a mortgage:

  • Alimony.

  • Car loans.

  • Child support.

  • Co-signed loans.

  • Credit cards.

  • Estimated mortgage (including property tax, home insurance, mortgage insurance).

  • Personal loans.

  • Student loans.

🤓Nerdy Tip

Include the monthly minimum due on credit cards in the DTI calculator, even if you typically pay more than the minimum.

Costs that are not included in DTI

DTI does not include costs for other items in a typical budget such as:

  • Car insurance.

  • Cell phone.

  • Food.

  • Health insurance.

  • Utilities.

How to lower debt-to-income ratio

Lowering your DTI will improve the odds of qualifying for a mortgage at the best available interest rates. Here are some tips for approaching it.

  • Avoid increasing expenses if you get a raise or take on a second job. The income boost will lower DTI, but only if you avoid taking on more credit card or other debt.

  • Use a salary raise or windfall to pay down debt. 

  • Reduce expenses if you can, and use that extra money to pay down debt.

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