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Your debt-to-income ratio (DTI) is the single most important number lenders look at when you apply for a mortgage, car loan, or personal loan. More important than your credit score in many cases. A high DTI can get you rejected even with a 750 credit score. A low DTI can help you qualify even with a mediocre score. Here is how it works, how to calculate yours, and how to improve it.
What Debt-to-Income Ratio Is
DTI is the percentage of your gross monthly income that goes toward debt payments. Gross means before taxes. Debt payments means minimum required payments, not what you actually pay.
Formula: DTI = Total Monthly Debt Payments / Gross Monthly Income x 100
Example: You earn $5,000/month gross. Your monthly debt payments are: $1,200 mortgage, $350 car payment, $150 student loan minimum, $80 credit card minimum. Total payments: $1,780. DTI = $1,780 / $5,000 = 35.6%.
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What Different DTI Levels Mean
| DTI Range | What It Means | Mortgage Eligibility |
|---|---|---|
| Under 36% | Healthy. Most lenders are comfortable here. | Easily qualifies for most mortgages |
| 36% to 43% | Acceptable but getting high. Some lenders flag this range. | Qualifies for most conventional loans |
| 43% to 50% | High. Conventional mortgage approval becomes difficult. | May need FHA or special programs |
| Over 50% | Very high. Most lenders will not approve new credit. | Typically disqualifies from mortgage |
Front-End vs Back-End DTI
Mortgage lenders use two versions of DTI:
Front-end DTI includes only housing costs (proposed mortgage payment, property taxes, homeowners insurance, HOA fees) divided by gross income. Most lenders want front-end DTI under 28%.
Back-end DTI includes all monthly debt payments including the proposed housing costs. This is the number most people mean when they say DTI. Conventional loans typically require back-end DTI under 43-45%. FHA loans allow up to 57% with compensating factors.
What Counts as Debt in the DTI Calculation
Lenders include: mortgage or proposed mortgage payment, car loans, student loans, personal loans, minimum credit card payments, child support or alimony, and any other recurring debt obligation with a payment schedule.
They do not include: utilities, insurance (except as part of a mortgage payment), groceries, subscriptions, or other living expenses.
Student loans in deferment or forbearance: lenders typically count 0.5-1% of the total student loan balance as a monthly payment even if you are not currently making payments, because you will eventually.
How to Lower Your DTI
There are exactly two ways to lower your DTI: increase your gross income or decrease your monthly debt payments.
Increase income
A raise, second job, or side hustle that increases your gross monthly income immediately improves your DTI ratio. $500/month in additional gross income with the same debt load drops the DTI in the example above from 35.6% to 32.3%. That may be the difference between qualifying for a mortgage and not.
Pay down debt strategically
Paying off a debt entirely removes its minimum payment from the DTI calculation. Paying down a credit card balance does not lower your DTI unless you close the account or reduce the minimum payment below its current level. Focus on eliminating entire accounts rather than reducing balances, specifically for DTI improvement purposes.
Which account to eliminate first for maximum DTI impact: the one with the highest minimum payment relative to remaining balance. A $500 balance with an $80 minimum improves DTI more per dollar spent than a $5,000 balance with a $100 minimum.
Avoid new debt before major applications
If you are planning to apply for a mortgage in the next 6-12 months, do not take on any new debt. A car loan taken 3 months before a mortgage application can add $400-$600/month to your DTI and push you from qualifying to not qualifying, regardless of your credit score.
Sources: Fannie Mae DTI guidelines; FHA DTI requirements; CFPB mortgage qualification standards. This article is for informational purposes only.
