How Much House Can I Afford? A Complete Guide

Why Calculating Affordability Matters

The excitement of buying a home can easily lead people to overextend themselves. Lenders will approve you for as much as they believe you can repay based on their risk models, but their maximum is often higher than what is financially comfortable. A mortgage that consumes too much of your income leaves no room for saving, investing, handling emergencies, or simply enjoying life.

In the years following the 2008 housing crisis, millions of Americans learned this lesson the hard way. Many had been approved for mortgages they could technically afford on paper but could not sustain when expenses rose or income dipped. The lesson is clear: calculating your true affordability before shopping is not optional -- it is essential.

The good news is that determining how much house you can afford is straightforward once you understand a few key concepts. Let us walk through them step by step.

The 28/36 Rule: The Gold Standard for Affordability

The 28/36 rule is the most widely used guideline in the mortgage industry for determining how much a borrower can comfortably afford. It consists of two parts:

• The 28% rule (front-end ratio): Your total monthly housing costs should not exceed 28% of your gross monthly income. Housing costs include your mortgage payment (principal and interest), property taxes, homeowners insurance, and any HOA fees.
• The 36% rule (back-end ratio): Your total monthly debt payments -- housing costs plus all other recurring debts such as car loans, student loans, and credit card minimum payments -- should not exceed 36% of your gross monthly income.

How to Apply the 28/36 Rule

Let us work through a real example. Suppose your household earns $90,000 per year before taxes. Your gross monthly income is $7,500.

• Maximum housing payment (28%): $7,500 x 0.28 = $2,100 per month
• Maximum total debt (36%): $7,500 x 0.36 = $2,700 per month

If you already have a $400 car payment and a $200 student loan payment, your existing non-housing debts total $600 per month. Under the 36% rule, you can allocate $2,700 - $600 = $2,100 to housing. In this case, both rules agree: your maximum monthly housing payment is $2,100.

But suppose your existing debts are $900 per month instead. The 36% rule would limit your housing payment to $2,700 - $900 = $1,800, which is stricter than the $2,100 allowed by the 28% rule. In practice, lenders apply whichever limit is lower.

At a $2,100 monthly housing budget, assuming a 6.5% interest rate, 30-year term, 1.2% property tax rate, and $150/month for insurance, you could afford a home priced at approximately $310,000 to $330,000 with a 10% down payment. Use our mortgage calculator to run your own numbers with your specific income and debts.

Understanding Debt-to-Income Ratio (DTI)

Your debt-to-income ratio is the percentage of your gross monthly income that goes toward debt payments. It is one of the most critical factors lenders evaluate when deciding whether to approve your mortgage application and at what rate.

DTI is expressed in two forms:

• Front-end DTI: Only includes housing-related expenses (mortgage, taxes, insurance, HOA). The standard limit is 28%, though some programs allow up to 31%.
• Back-end DTI: Includes all monthly debt obligations plus housing costs. The conventional limit is 36%, but FHA loans allow up to 43%, and some lenders will go as high as 50% with strong compensating factors like a high credit score or substantial savings.

DTI Ranges and What They Mean

• Under 20%: Excellent. You have significant financial flexibility and will qualify for the best rates.
• 20% to 35%: Good. Manageable debt levels that most lenders are comfortable with.
• 36% to 43%: Acceptable but tight. You may qualify but should be cautious about taking on more debt.
• 44% to 50%: High risk. Only certain loan programs will approve you, and your interest rate will be higher.
• Over 50%: Most lenders will not approve a mortgage at this level. Focus on reducing existing debt first.

The lower your DTI, the more room you have in your budget for savings, investments, and unexpected expenses. Many financial advisors recommend keeping your total DTI below 30% for true financial comfort, even though lenders may approve you for more.

Income-Based Affordability: Quick Rules of Thumb

While the 28/36 rule is the most precise method, several quick rules of thumb can give you a starting point when estimating home affordability based on income alone.

The 3x to 5x Income Rule

A traditional guideline suggests you can afford a home priced at 3 to 5 times your annual gross income. The exact multiple depends on your debts, interest rates, and down payment size. Here is how this plays out at various income levels:

• $50,000 income: $150,000 to $250,000 home
• $75,000 income: $225,000 to $375,000 home
• $100,000 income: $300,000 to $500,000 home
• $150,000 income: $450,000 to $750,000 home
• $200,000 income: $600,000 to $1,000,000 home

Use the lower end of the range if you have significant existing debts, a smaller down payment, or live in an area with high property taxes. Use the higher end if you are debt-free, have a 20%+ down payment, and have excellent credit.

Why Income Alone Is Not Enough

These income multiples are useful starting points, but they do not account for individual circumstances. Two people earning $100,000 per year can have drastically different affordability profiles based on their existing debts, credit scores, savings, and lifestyle expenses. Always run a detailed calculation using our down payment calculator and mortgage calculator before committing to a price range.

How Your Down Payment Impacts Affordability

The size of your down payment has a dramatic effect on how much house you can afford and the total cost of your mortgage. A larger down payment reduces your loan amount, lowers your monthly payment, may eliminate PMI, and can even help you secure a lower interest rate.

Down Payment Comparison: $350,000 Home at 6.5%

The difference between a 5% and 20% down payment on a $350,000 home is $554 per month -- $332 in lower principal-and-interest payments plus $222 in eliminated PMI. Over the life of a 30-year loan, that 20% down payment saves you roughly $80,000 compared to a 5% down payment.

That said, waiting years to save a 20% down payment while home prices rise is not always the best strategy either. In many markets, the appreciation you gain by buying sooner with a smaller down payment can outweigh the cost of PMI. The key is running the numbers for your specific situation.

Interest Rates: The Multiplier You Cannot Ignore

Even a small difference in your mortgage interest rate has an enormous impact on both your monthly payment and total cost. Here is how different rates affect a $300,000, 30-year mortgage:

• 5.5%: $1,703/month -- $313,212 total interest
• 6.0%: $1,799/month -- $347,515 total interest
• 6.5%: $1,896/month -- $382,633 total interest
• 7.0%: $1,996/month -- $418,527 total interest
• 7.5%: $2,098/month -- $455,089 total interest

The difference between a 5.5% and 7.5% rate on a $300,000 loan is $395 per month and $141,877 in total interest over 30 years. This is why improving your credit score before applying, shopping multiple lenders, and considering buying points (prepaid interest) can make a massive financial difference.

Your credit score is the primary driver of the rate you receive. Borrowers with scores above 760 typically receive the lowest available rates, while those between 620 and 680 may pay 0.5% to 1.5% more. Improving your credit score from 680 to 740 before applying could save you over $50,000 over the life of your loan.

The Hidden Costs That Reduce Your Buying Power

Your mortgage payment is only part of the total cost of homeownership. These additional expenses directly reduce how much home you can actually afford:

• Property taxes: Vary dramatically by location, ranging from 0.3% in Hawaii to over 2.2% in New Jersey. On a $350,000 home, property taxes could range from $1,050 to $7,700 per year.
• Homeowners insurance: Typically $1,000 to $3,500 per year, though costs are rising rapidly in disaster-prone areas like Florida, California, and Texas.
• Private mortgage insurance (PMI): Required if your down payment is less than 20%. Usually 0.5% to 1.5% of the loan amount annually.
• HOA fees: If applicable, these can range from $100 to $1,000+ per month depending on the community and amenities.
• Maintenance and repairs: Budget 1% to 2% of the home's value per year. For a $350,000 home, that is $3,500 to $7,000 annually.
• Utilities: Often higher in a house than an apartment. Budget $200 to $500 per month depending on home size and climate.
• Closing costs: A one-time expense of 2% to 5% of the purchase price ($7,000 to $17,500 on a $350,000 home).

When you add these costs together, a $350,000 home with a $1,770 mortgage payment (20% down at 6.5%) actually costs $2,500 to $3,200 per month in total housing expenses. Make sure your affordability calculations account for all of these items, not just the mortgage payment. Our mortgage calculator helps you factor in taxes, insurance, and PMI for a more realistic picture.

Practical Steps to Determine Your Budget

1. Calculate your gross monthly income. Include all reliable, documented sources: salary, regular bonuses, rental income, and investment income. If you are buying with a partner, combine both incomes.
2. List all monthly debt payments. Include car loans, student loans, credit card minimums, personal loans, child support, and any other recurring obligations.
3. Apply the 28/36 rule. Multiply your gross monthly income by 0.28 for your maximum housing payment, and by 0.36 for your maximum total debt. Subtract existing debts from the 36% figure and use the lower of the two housing amounts.
4. Subtract taxes, insurance, and PMI. These non-mortgage housing costs typically consume $400 to $900 of your monthly housing budget, depending on location and down payment size.
5. Determine your loan amount. Use a mortgage calculator to find the loan amount that produces a principal-and-interest payment equal to your remaining budget after subtracting taxes, insurance, and PMI.
6. Add your down payment. Your maximum purchase price equals your loan amount plus your down payment.
7. Reality-check with your lifestyle. Ask yourself whether you can maintain this payment while still saving for retirement, building an emergency fund, and enjoying your life. If the answer is no, adjust downward.

When You Should Buy Less House Than You Can Afford

There are several situations where buying below your maximum is the smarter move:

• You want to retire early. Maximizing your mortgage leaves less for retirement investments. A lower housing payment lets you invest more aggressively for the future.
• You have variable income. Freelancers, commission-based workers, and business owners should budget conservatively since income fluctuates.
• You plan to have children. Childcare costs can easily add $1,000 to $2,500 per month. If children are in your plans, leave room in your budget.
• Your job security is uncertain. If layoffs are possible in your industry, a lower payment gives you a longer financial runway during unemployment.
• You value financial freedom. Being "house-poor" -- where most of your income goes to housing -- is one of the most common sources of financial stress. A comfortable margin gives you options.

A good rule of thumb: if your budget says you can afford $2,500 per month in housing, targeting a payment of $2,000 to $2,200 gives you breathing room for life's inevitable surprises.

Affordability by Location: Why It Varies So Much

The same income buys very different homes depending on where you live. A $100,000 salary in the Midwest can comfortably support a $350,000 home, while the same salary in San Francisco or New York barely covers a studio apartment. The major factors driving regional differences include:

• Median home prices: Range from $150,000 in some rural and Midwestern areas to over $1,000,000 in major coastal cities.
• Property tax rates: A 2% property tax rate versus a 0.5% rate can add or subtract hundreds of dollars from your monthly housing cost on the same-priced home.
• Insurance costs: Flood zones, hurricane zones, and wildfire areas have dramatically higher insurance premiums.
• State and local income taxes: States with no income tax leave more of your gross pay available for housing, while high-tax states reduce your effective buying power.

Always research local costs before applying broad national rules. What feels affordable on a calculator may not match reality in your specific market.