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Debt-to-Income Ratio Calculator

Wondering how your debt affects your mortgage?

Use Lock It Mortgage's debt-to-income (DTI) calculator to see how your monthly debts compare with your income. Enter your monthly income and recurring debts to estimate your DTI and better understand how lenders may evaluate your ability to qualify for a mortgage.

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Debt-to-Income Ratio
This percentage reflects your back-end DTI ratio, which measures your total monthly debt obligations. It combines your proposed new housing payment (principal, interest, taxes, insurance, HOA) with all recurring monthly debts (car loans, credit card minimums, student loans, personal loans, and other debts) and divides them by your gross monthly income.
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You're in a great spot! A DTI of 36% or lower means a smaller portion of your monthly income is going toward debt payments, which can give you more room in your budget for a home.
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Total monthly debts $0
Estimated monthly mortgage payment $0
Remaining monthly income $0
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What Is a Debt-to-Income Ratio?

Your Debt-to-Income (DTI) Ratio is the percentage of your gross monthly income that goes toward your monthly debt obligations. Lenders use DTI as one part of the mortgage qualification process to help evaluate whether you can manage your proposed housing payment along with your other debts.

When lenders evaluate your DTI, they look at two separate numbers:

  • Front-End Ratio (Housing Ratio): The percentage of your gross monthly income that goes toward your proposed housing costs, including principal, interest, property taxes, homeowners insurance, HOA dues, and mortgage insurance when applicable.
  • Back-End Ratio (Total Debt Ratio): The percentage of your gross monthly income that goes toward your proposed housing costs plus other monthly debt obligations, such as car loans, student loans, credit card minimum payments, and personal loans.

Keep in mind: If you're buying a primary residence, your current rent payment generally isn't added to your proposed mortgage payment because the new housing payment is expected to replace your rent. However, other housing expenses or mortgages on properties you already own may still need to be included, depending on the loan program and your situation.

How to Calculate Your DTI Ratio

DTI Ratio = Total Monthly Debt Gross Monthly Income × 100

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Add Up Your Gross Monthly Income

Enter your total qualifying gross monthly income before taxes and other deductions. If you're salaried, divide your annual salary by 12. If you're paid hourly, your qualifying income may be calculated based on your hourly rate, average hours worked, and other factors. If you're applying with a co-borrower, include qualifying income for both borrowers.

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Add Up Your Monthly Debts

Enter your recurring monthly debt payments, such as credit card minimum payments, car loans, student loans, personal loans, and your estimated new housing payment. Everyday expenses such as groceries, utilities, and cell phone bills are generally not included in DTI.

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Calculate Your DTI

Divide your total monthly debt by your gross monthly income, then multiply by 100 to get your DTI percentage.

Example:

Imagine Sarah and Mark are shopping for a home and want to calculate their debt-to-income ratio to get an idea of how their debts may affect their mortgage qualification.

First, they look at what they earn together every month before taxes and deductions come out of their paychecks. Sarah brings in $5,000 a month from her job, and Mark brings in $4,000 a month. Combined, their gross monthly income is $9,000.

Next, they add up all the recurring monthly debt payments that show up on their credit reports, plus the estimated monthly payment for the home they want to buy:

  • Auto loan: $450
  • Student loans: $250
  • Credit card minimums: $150
  • Estimated new monthly mortgage payment (Principal, Interest, Taxes, and Insurance): $2,150

When they add those four numbers together, their total monthly debt obligation comes out to $3,000.

To find their final DTI percentage, they divide $3,000 by $9,000 and get 0.3333. Multiply that by 100 to get a DTI of 33.3%.

What this means for them: A 33.3% DTI means about one-third of their gross monthly income is committed to the debts included in this calculation. A lower DTI can be a positive factor when lenders evaluate a mortgage application, but DTI is only one part of the overall qualification process.

What Is a "Good" Debt-to-Income Ratio?

There is no single DTI ratio that guarantees mortgage approval. DTI requirements vary by loan program, lender, underwriting method, and your overall financial profile. In general, a lower DTI means less of your gross monthly income is committed to debt payments. However, lenders also consider factors such as credit history, assets, down payment, income stability, and the type of loan you're applying for.

You may also hear about the 28/36 rule. This traditional budgeting guideline suggests spending about 28% of your gross monthly income on housing costs, and no more than 36% on total monthly debt. These numbers can be helpful when planning your budget, but they are not universal mortgage approval limits.

Here is a general way to think about your back-end DTI range:

  • 36% or Lower (Generally Favorable): A DTI in this range generally means a smaller portion of your gross monthly income is committed to debt payments. Lower DTI can be a positive factor when lenders evaluate your overall financial profile, but it does not by itself guarantee loan approval or better rates.
  • 37% to 50% (Often Workable): DTI in this range is common among homebuyers and may be acceptable for many loan programs. The maximum DTI allowed can vary based on the loan program, lender, underwriting method, and your overall financial profile.
  • 50% or Higher (Higher Debt Level): A DTI at or above 50% means a larger portion of your gross monthly income is committed to debt payments. However, a DTI above 50% does not automatically mean you cannot qualify for a mortgage. Some loan programs may allow higher DTI ratios, while others may have lower limits or additional requirements.
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How DTI Guidelines Vary by Loan Program

DTI requirements can vary depending on the type of mortgage, lender, and how your loan is reviewed. Some loans are evaluated using an automated underwriting system, while others may require additional manual review.

Here are some general examples:

Conventional Mortgage DTI Guidelines

Some conventional loans may allow a total DTI of up to 50% when approved through an automated underwriting system. Manually underwritten loans may have different and sometimes lower DTI requirements. For example, Fannie Mae generally limits manually underwritten loans to 36% total DTI, with certain borrowers potentially qualifying up to 45% when applicable requirements are met.

* Scroll right to view the full table >

Underwriting Method Total DTI
Automated underwriting Up to 50%
Manual underwriting 36%
Manual underwriting with applicable requirements Up to 45%

FHA Mortgage DTI Guidelines

FHA DTI requirements can vary depending on how the loan is underwritten and the borrower's overall financial profile. Most FHA loans are evaluated through the FHA TOTAL Mortgage Scorecard, which provides an automated underwriting recommendation. Manually underwritten FHA loans have specific qualifying-ratio requirements, with higher ratios possible when applicable requirements and compensating factors are met.

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Underwriting Method DTI Guidelines
Automated underwriting Determined by the automated underwriting recommendation
Manual underwriting 31% front-end / 43% back-end
Manual underwriting with applicable requirements Up to 40% front-end / 50% back-end

Important: FHA DTI requirements can vary based on credit score, compensating factors, underwriting method, and other loan requirements. These are general guidelines and are not guaranteed approval limits.

VA Mortgage DTI Guidelines

VA loans consider both DTI and residual income, which is the money left over each month after major debts and housing expenses. A 41% DTI is an important VA guideline, but it is not an automatic approval or denial threshold. Higher DTI ratios may be considered when the overall application and residual income support the loan.

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Underwriting Method DTI Guidelines
Automated underwriting Determined by automated underwriting recommendation
Manual underwriting 41% guideline
Higher DTI May be considered with sufficient residual income and other requirements

USDA Mortgage DTI Guidelines

USDA loans use the Guaranteed Underwriting System (GUS) to evaluate a borrower's overall credit and financial profile. The standard USDA debt ratios are 29% for housing expenses and 41% for total monthly debt, but a GUS approval may allow ratios above these guidelines depending on the overall loan profile.

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Underwriting Method DTI Guidelines
Automated underwriting (GUS) May exceed 29% / 41% with an eligible GUS recommendation
Manual underwriting 29% front-end / 41% back-end
Higher DTI May be allowed with applicable compensating factors and USDA requirements

Important: USDA DTI requirements can vary based on the GUS recommendation, underwriting method, compensating factors, credit profile, and other loan requirements. These are general guidelines and are not guaranteed approval limits.

Non-QM Mortgage DTI Guidelines

Non-QM loans offer more flexible qualification options for borrowers who may not fit traditional mortgage guidelines. DTI requirements can vary by lender, loan program, income documentation method, credit profile, and other factors. Some Non-QM programs may allow higher DTI ratios than traditional mortgage programs.

* Scroll right to view the full table >

Underwriting Method DTI Guidelines
Automated underwriting / AUS Varies by lender and program
Alternative / Flexible underwriting Varies by lender and program
Higher DTI Some programs may allow 50% or more

Important: Non-QM DTI requirements vary significantly by program and lender. A higher DTI does not guarantee approval, and other factors such as credit, income, assets, reserves, property type, and the method used to document income may also affect eligibility.

How to Lower Your DTI Ratio

If your DTI is higher than you'd like, there are several practical ways to improve it. In general, you can improve your DTI by lowering your monthly debt obligations or increasing your qualifying income.

  • Pay Down Credit Card Balances: Reducing your credit card balances can lower your monthly debt obligations and may also improve your credit utilization.
  • Consolidate or Refinance High-Interest Debt: Depending on your situation, consolidating or refinancing certain debts may help reduce your monthly payments and improve your DTI.
  • Review Authorized User Accounts: If you're an authorized user on someone else's credit card, your mortgage professional can help determine how that account may be treated when calculating your DTI.
  • Increase Your Down Payment: Putting more money down can reduce the amount you need to borrow, which may lower your projected monthly mortgage payment.
  • Avoid Taking on New Debt: Limiting new car loans, credit cards, personal loans, or other financed purchases can help keep your monthly debt obligations manageable while you're preparing to buy a home.
  • Boost Your Qualifying Income: Overtime, bonuses, commissions, and other income may help increase your qualifying income when they meet applicable documentation and history requirements.
  • Take Advantage of Certain Debt-Exclusion Rules: Certain installment debts with 10 or fewer payments remaining may be excluded from your DTI calculation, depending on the loan program and applicable underwriting requirements.

Important Mortgage Note: If you're already working through a mortgage application, talk with your loan officer before paying off debt, consolidating accounts, opening new credit, or making other major financial changes. Changes to your debts, credit, or assets may affect your loan qualification or require additional documentation during the mortgage process.

Ready to Take the Next Step?

Online calculators are a fantastic way to explore your options, but getting pre-approved is where everything comes together. When you are ready, our team at Lock It Mortgage is here to confirm your true budget and help you shop with total confidence.

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Have questions or want to talk through your numbers?

Our friendly mortgage advisors are here to listen to your goals and map out what you can comfortably afford.

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Take just a couple of minutes to submit your details online, and we will build a custom financing strategy just for you.

Frequently Asked Questions

Does my DTI ratio hurt my credit score?
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No. Your DTI is not included on your credit report and does not directly affect your credit score. However, paying down revolving debt can lower your credit utilization, which may help your credit score.
What expenses are excluded from my DTI?
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Lenders only look at recurring debt obligations. Everyday living expenses like groceries, utility bills, cell phone plans, health insurance, childcare, and streaming subscriptions are not counted in your DTI calculation.
Can I still get a mortgage if I have a high DTI?
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Yes, many buyers successfully close loans with higher DTIs, especially if they have strong compensating factors like a high credit score, cash reserves, a larger down payment, or if they utilize flexible loan programs like FHA or Non-QM.
Will paying off a credit card instantly change my DTI?
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Paying off the balance lowers your actual debt immediately, but credit bureaus typically take 30 to 45 days to update. If you need a faster update during your mortgage process, your loan officer can request a rapid rescore with proof of zero balance.
Does checking my DTI hurt my credit?
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Not at all. Using our online DTI calculator is entirely educational and has zero impact on your credit score.
What is the difference between front-end and back-end DTI?
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Your front-end ratio measures only your proposed housing costs (principal, interest, taxes, insurance, and HOA dues) as a percentage of your income. Your back-end ratio includes those housing costs plus all other recurring monthly debts (car loans, student loans, credit cards). Lenders generally place the most weight on your back-end ratio.
How do lenders handle alimony or child support in my DTI?
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If you are required to pay alimony or child support, lenders count those required monthly payments as part of your recurring debts, adding them into your back-end DTI calculation. Conversely, if you receive alimony or child support, it can sometimes be added to your gross monthly income if it is documented and legally mandated to continue.
Does my current rent payment count toward my DTI?
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For a typical primary-residence purchase, your current rent payment generally is not included as a separate debt once it is being replaced by your new housing payment. However, your specific situation and loan program may affect how housing expenses are treated.
Can a co-borrower help lower my overall DTI?
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A co-borrower may help improve the overall DTI if the additional qualifying income is greater than the additional debts being included. Both borrowers' qualifying income and debts are generally considered in the application.
What is an Automated Underwriting System (AUS), and how does it affect my DTI?
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An AUS is a specialized computer software program used by lenders to evaluate your credit history, assets, and DTI against specific loan guidelines. Most mortgage approvals are handled automatically through an AUS, which can often approve slightly higher DTI thresholds than traditional manual underwriting.

Disclaimer: This DTI calculator and the information provided by Lock It Mortgage are for educational and estimating purposes only. They do not constitute a loan pre-approval, commitment to lend, or guarantee of loan approval or terms. Results are based on the information you enter and may not reflect all underwriting requirements or costs that apply to your specific situation. Actual loan eligibility, DTI requirements, interest rates, and loan terms depend on the loan program, lender guidelines, credit profile, income, assets, property, and other factors. Final eligibility is determined through the formal underwriting process and verification of your financial information.