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Real Estate

Understanding the 28/36 Rule for Home Affordability: A Comprehensive Guide

Abraham Nnanna
By Abraham Nnanna
Last updated: May 8, 2025
11 Min Read
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Introduction

Buying a home is one of the most significant financial decisions you’ll make in your life. It’s a dream for many, but it also comes with a substantial financial commitment. To ensure that you don’t overextend yourself and end up in a financially precarious situation, lenders have developed guidelines to help determine how much you can afford to borrow for a mortgage. One of the most widely used guidelines is the 28/36 rule, also known as the debt-to-income ratio (DTI).

Jump To
IntroductionWhat is the 28/36 Rule?Why is the 28/36 Rule Important?Exceptions to the 28/36 RuleCalculating Your Debt-to-Income RatiosConclusionFAQs 

What is the 28/36 Rule?

The 28/36 rule is a guideline used by lenders to assess a borrower’s ability to handle a mortgage payment. It dictates that your housing costs should not exceed 28% of your gross monthly income, and your total monthly debt payments, including housing costs, should not exceed 36% of your gross monthly income.

Here’s a breakdown of the two ratios:

Front-End Ratio (28%)

The front-end ratio, or the housing expense ratio, represents the maximum portion of your gross monthly income that should be allocated towards housing costs, which include:

  • Principal and interest payments on your mortgage
  • Property taxes
  • Homeowners insurance
  • Homeowners association (HOA) fees (if applicable)

According to the 28/36 rule, your total housing costs should not exceed 28% of your gross monthly income. For example, if your gross monthly income is $5,000, your housing costs should not exceed $1,400 (28% of $5,000).

Back-End Ratio (36%)

The back-end ratio, also known as the debt-to-income ratio (DTI), represents the maximum portion of your gross monthly income that should be allocated towards all your monthly debt payments, including housing costs. In addition to your housing expenses, this ratio takes into account other recurring debt payments, such as:

  • Credit card payments
  • Student loan payments
  • Auto loan payments
  • Personal loan payments
  • Child support or alimony payments

The 28/36 rule states that your total monthly debt payments, including housing costs, should not exceed 36% of your gross monthly income. Using the same example of a $5,000 gross monthly income, your total monthly debt payments should not exceed $1,800 (36% of $5,000).

Why is the 28/36 Rule Important?

The 28/36 rule is important for several reasons:

1. It helps lenders assess your ability to repay the loan

Lenders use the 28/36 rule to evaluate your debt-to-income ratio, which is a critical factor in determining your ability to make mortgage payments consistently. By ensuring that your housing costs and total debt payments fall within the recommended ratios, lenders can gauge your financial stability and reduce the risk of default.

2. It prevents you from becoming “house poor”

Adhering to the 28/36 rule can help prevent you from becoming “house poor,” a situation where a significant portion of your income is consumed by housing costs, leaving little room for other essential expenses or savings. By following this guideline, you can maintain a balanced budget and avoid financial strain.

3. It promotes long-term financial stability

The 28/36 rule is designed to ensure that you have enough disposable income to cover other living expenses, save for emergencies, and achieve long-term financial goals, such as retirement planning or paying off debts. By maintaining reasonable debt levels, you can better manage your finances and build a solid financial foundation.

Exceptions to the 28/36 Rule

While the 28/36 rule is a widely accepted guideline, it is not a strict requirement. Lenders may consider exceptions or adjust the ratios based on various factors, such as:

1. Credit Score

If you have an excellent credit score, some lenders may be willing to stretch the debt-to-income ratios slightly higher. A high credit score demonstrates a strong track record of responsible borrowing and repayment, which can offset some of the risks associated with a higher DTI.

2. Compensating Factors

Lenders may consider other compensating factors that can offset a higher DTI, such as:

  • A substantial down payment
  • Significant cash reserves or liquid assets
  • A stable employment history
  • A low loan-to-value ratio (LTV)
  • Income from rental properties or other sources

3. Loan Program Guidelines

Different loan programs may have varying DTI requirements. For example, the Federal Housing Administration (FHA) allows a higher DTI of up to 50% in some cases, while conventional loans typically cap the DTI at 43% for conforming loans. VA loans and USDA loans may also have different DTI guidelines.

Calculating Your Debt-to-Income Ratios

To determine if you meet the 28/36 rule, you’ll need to calculate your front-end and back-end ratios. Here’s how:

Step 1: Calculate Your Gross Monthly Income

Start by determining your gross monthly income, which is your total income before taxes and deductions. If you’re self-employed or have variable income, you may need to use an average of your monthly income over the past 12 months.

Step 2: Calculate Your Monthly Housing Costs

Next, calculate your monthly housing costs, including:

  • Projected principal and interest payments on your mortgage
  • Property taxes
  • Homeowners insurance
  • HOA fees (if applicable)

Step 3: Calculate Your Front-End Ratio

To calculate your front-end ratio, divide your monthly housing costs by your gross monthly income and multiply by 100.

Front-end ratio = (Monthly housing costs / Gross monthly income) x 100

Step 4: Calculate Your Total Monthly Debt Payments

Add up all your recurring monthly debt payments, including:

  • Credit card payments
  • Student loan payments
  • Auto loan payments
  • Personal loan payments
  • Child support or alimony payments

Step 5: Calculate Your Back-End Ratio (DTI)

To calculate your back-end ratio, or DTI, add your monthly housing costs to your total monthly debt payments, then divide by your gross monthly income and multiply by 100.

Back-end ratio (DTI) = (Monthly housing costs + Total monthly debt payments) / Gross monthly income x 100

If your front-end ratio is at or below 28% and your back-end ratio (DTI) is at or below 36%, you meet the 28/36 rule and may be considered a strong candidate for a mortgage loan.

Conclusion

The 28/36 rule is a valuable guideline for determining home affordability and ensuring that you don’t overextend yourself financially when purchasing a home. By adhering to this rule, you can maintain a balanced budget, avoid becoming “house poor,” and promote long-term financial stability.

However, it’s important to remember that the 28/36 rule is just a guideline, and lenders may consider exceptions or adjust the ratios based on factors such as your credit score, compensating factors, and loan program guidelines.

When evaluating your home-buying budget, it’s crucial to consider not only the 28/36 rule but also your overall financial situation, long-term goals, and lifestyle preferences. Working with a qualified mortgage lender can help you navigate the complexities of the home-buying process and make an informed decision that aligns with your financial capabilities and aspirations.

If you’re in the market for a new home and need financing assistance, reach out to RCN Capital for expert guidance and personalized loan solutions tailored to your unique needs.

FAQs 

1. Can I exceed the 28/36 rule?

While the 28/36 rule is a widely accepted guideline, it is not a strict requirement. Some lenders may be willing to approve mortgages with higher debt-to-income ratios, especially if you have compensating factors such as a high credit score, substantial cash reserves, or a low loan-to-value ratio. However, exceeding the 28/36 rule can increase your risk of becoming financially overextended, so it’s essential to carefully evaluate your ability to manage higher debt levels.

2. Does the 28/36 rule apply to all mortgage types?

The 28/36 rule is primarily used for conventional mortgage loans, which are the most common type of mortgage. However, other mortgage programs, such as FHA loans, VA loans, and USDA loans, may have different debt-to-income ratio requirements. It’s essential to understand the specific guidelines for the loan program you’re interested in.

3. Can I use the 28/36 rule to determine how much house I can afford?

The 28/36 rule can serve as a helpful guideline for determining how much house you can afford, but it should not be the sole factor in your decision. Other considerations, such as your long-term financial goals, job stability, and lifestyle preferences, should also play a role in determining your home-buying budget.

4. Does the 28/36 rule consider my credit score?

No, the 28/36 rule does not directly consider your credit score. However, lenders may be willing to stretch the debt-to-income ratios slightly if you have an excellent credit score, as it demonstrates a strong history of responsible borrowing and repayment.

5. Can I use other debt-to-income ratios to qualify for a mortgage?

While the 28/36 rule is widely used, some lenders may use alternative debt-to-income ratios or guidelines to evaluate your mortgage eligibility. For example, some lenders may use a 33/38 rule or a 31/43 rule. It’s essential to discuss the specific requirements with your lender to understand their guidelines.

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