When planning to buy a home, one of the first questions you might ask is, “How much house can I afford?” While it’s tempting to simply subtract your monthly expenses from your income to figure out a mortgage payment, lenders use a more structured approach to determine what you can borrow. Enter the 28/36 rule, a key guideline used by banks and mortgage lenders to assess your home-buying budget. In this article, we’ll break down what the 28/36 rule is, how it works, and how to apply it in today’s high-priced housing market.
What is the 28/36 Rule?
The 28/36 rule is a financial guideline that helps determine how much you can afford to spend on a home. It sets two limits based on your gross monthly income (your income before taxes):
- 28% Front-End Ratio: No more than 28% of your gross monthly income should go toward housing costs, often referred to as PITI (principal, interest, taxes, and insurance).
- 36% Back-End Ratio: No more than 36% of your gross monthly income should go toward all your debts combined, including housing costs and other obligations like car loans, student loans, or credit card payments. This is also known as your debt-to-income (DTI) ratio.
While called a “rule,” the 28/36 guideline isn’t a law—it’s a standard used by lenders, especially for conventional conforming loans, to ensure you don’t take on more debt than you can handle. Lenders are legally required to evaluate your ability to repay, and the 28/36 rule helps them do that. However, some flexibility exists: many lenders allow a DTI up to 45% for conventional loans, and FHA, VA, or USDA loans may offer even more wiggle room.
Why the 28/36 Rule Matters
The 28/36 rule is designed to protect both you and the lender. By keeping your housing and debt payments within these limits, you’re less likely to overextend yourself financially, and the lender reduces the risk of you defaulting on the loan. This makes it a critical tool for budgeting for a home purchase.
How the 28/36 Rule Works: An Example
Let’s see how the 28/36 rule applies to a $500,000 home purchase with a 20% down payment ($100,000) and a 30-year fixed-rate mortgage at 7% interest.
- Monthly Principal and Interest: Using a mortgage calculator, your monthly payment for principal and interest would be approximately $2,210.
- Taxes and Insurance: Add about $400 per month for property taxes and homeowners insurance (this varies by location).
- Total Housing Costs: Your monthly housing costs (PITI) would total $2,610.
To stay within the 28% front-end ratio, your gross monthly income needs to be at least:
$2,610 ÷ 0.28 = $9,321 per month (or about $111,852 per year).
For the 36% back-end ratio, your total monthly debt payments (including housing, car loans, student loans, etc.) should not exceed:
$9,321 × 0.36 = $3,356 per month.
This means your non-housing debts (like credit cards or car payments) should not exceed $3,356 – $2,610 = $746 per month.
Note: This example doesn’t include upfront costs like the down payment or closing costs, which you’ll also need to budget for.
Applying the 28/36 Rule in Today’s Market
With record-high home prices and elevated mortgage rates in 2025, sticking to the 28/36 rule can feel challenging. Many homebuyers find themselves needing to spend more than 28% of their income on housing just to afford a home in their desired area. So, is the 28/36 rule still practical?
According to Greg McBride, CFA, chief financial analyst for Bankrate, “The rule is still practical today. Given today’s high home prices and high mortgage rates, prospective homebuyers might be dismissive of the rule and think it is a relic of the past. But if you can’t align with those guidelines, or aren’t even close, consider it a warning that you’re carrying too much debt or buying too much house.”
Factors That Affect the 28/36 Rule
The 28/36 rule doesn’t account for every aspect of your financial situation. Here are some factors that might give you more flexibility:
- Credit Score: A very good or excellent credit score (typically 740 or higher) can act as a “compensating factor,” allowing lenders to approve you for a larger loan even if your DTI is higher than 36%.
- Personal Circumstances: If you live in a high-cost area, you may have no choice but to allocate more than 28% of your income to housing. Lenders may be more lenient in these cases.
- Loan Type: Non-conventional loans like FHA, VA, or USDA loans often allow higher DTI ratios, sometimes up to 50% in certain cases.
However, exceeding the 36% DTI threshold comes with risks. A higher mortgage payment could strain your budget, leaving less room for other financial goals like saving for retirement, home repairs, or emergencies.
How to Improve Your DTI Ratio
If your current debt and income don’t align with the 28/36 rule, there are steps you can take to improve your DTI ratio and increase your chances of qualifying for a mortgage:
- Pay Down Debt: Focus on reducing high-interest debts like credit cards or personal loans. Even paying off a small amount can lower your DTI.
- Increase Income: Consider a side hustle, a raise, or a new job to boost your gross monthly income.
- Choose a Less Expensive Home: Opt for a more affordable property, such as a condo or townhouse, to reduce your mortgage amount.
- Explore Down Payment Assistance: Many local and state programs offer down payment assistance, which can lower the amount you need to borrow and make monthly payments more manageable.
- Wait and Save: If time allows, take a year or two to pay down debt, save for a larger down payment, and improve your financial profile.
As McBride advises, “Consider taking time to pay down debt and see further income growth that would make homeownership more tenable in another year or two.”
FAQs About the 28/36 Rule
How Much House Can I Afford with a $150,000 Salary?
With a $150,000 annual salary, your gross monthly income is approximately $12,500. Applying the 28/36 rule:
- Housing Costs (28%): You should spend no more than $12,500 × 0.28 = $3,500 per month on housing.
- Total Debt (36%): Your total debt payments should not exceed $12,500 × 0.36 = $4,500 per month.
The exact home price you can afford depends on your credit score, mortgage rate, loan type, and location (due to taxes and insurance costs).
Is the 28/36 Rule Before or After Taxes?
The 28/36 rule is based on your gross income, which is your income before taxes are deducted.
Should I Spend More Than 36% on Debt?
While some lenders allow a DTI above 36%, exceeding this threshold can stretch your budget thin. Before committing to a larger loan, consider:
- Other Financial Goals: Will a higher mortgage payment limit your ability to save for retirement, home improvements, or other priorities?
- Monthly Budget: Can you cover essentials like groceries, utilities, and emergency savings with a bigger mortgage payment?
- Interest Costs: A larger loan means paying more interest over time, especially if you stay in the home for many years.
Summary
The 28/36 rule is a valuable tool for budgeting for a home purchase, helping you and your lender determine a mortgage payment that fits your financial situation. While today’s high home prices and mortgage rates may make it tempting to stretch beyond these guidelines, staying within the 28/36 limits can protect you from financial strain. If the numbers don’t add up, consider paying down debt, exploring more affordable housing options, or leveraging down payment assistance programs. By planning carefully, you can find a home that fits both your dreams and your budget.
Are you thinking of buying or selling a home in the South Florida area? We can help! Contact Natasha at Live South Florida Realty, Inc. today! Also, be sure to download the free Florida Home Search App for your smartphone or tablet.
