How to calculate how much house I can afford

You can calculate how much house you can afford by reviewing your gross monthly income, monthly debt obligations, down payment savings, credit score and estimated mortgage interest rate. Many homebuyers use the 28/36 rule as a starting point. However, the amount a lender approves and the amount you can comfortably afford are often two different numbers.

You might have a certain purchase price in mind based on the neighborhood you want to live in or your vision for your future home. But before you start your search, compare that number against your overall financial picture.

Knowing your affordability number at the start can help you make confident decisions throughout the buying process, giving you a clearer picture of what fits comfortably within your budget, both now and as your financial goals evolve.

Explore the five key factors to home affordability, the 28/36 rule and how to set a budget that fits your long-term goals. When you're ready, estimate your budget with a home affordability calculator.

The lender's checklist vs. your bottom line

Qualifying for a mortgage and comfortably affording a home aren't always the same thing. A lender's job is to measure lending risk. As a buyer, your job is to determine how a monthly mortgage payment fits into your overall financial picture and long-term goals.

To estimate the maximum loan amount you may qualify for, lenders consider factors such as your credit score, loan-to-value (LTV) ratio and debt-to-income (DTI) ratio. These factors help lenders measure risk, but they don’t account for your lifestyle, spending habits or personal financial priorities.

As you calculate your own homebuying budget, think beyond the lender's numbers to consider:

• How much money you'll have left each month after your mortgage payment
• Whether you can continue building savings
• How much your emergency fund can support
• Any major upcoming expenses, such as growing your family, changing careers or paying tuition

Your mortgage represents one part of your financial journey, not all of it. The right monthly payment should still leave room for the rest of your life.

5 inputs you need to calculate home affordability

Several factors determine how much house you can comfortably afford. Gathering this information before you start shopping can help you create a realistic homebuying budget and price range.

1. Gross monthly income

Gross monthly income is your total household income before taxes and other deductions. If you're applying for a mortgage with a co-borrower, include the income of every borrower who will appear on the loan application.

Lenders use your gross monthly income as the starting point for calculating key affordability ratios, including your debt-to-income (DTI) ratio. In general, higher and more stable income increases your borrowing power. However, it should also support a monthly payment that fits comfortably within your overall budget.

As you estimate your gross monthly income, include income that you can document and expect to continue receiving. Depending on your situation, that may include:

• W-2 income
• Consistent 1099 or self-employment income
• Other documented recurring income that meets lender requirements

Once you've calculated your gross monthly income, you'll have the foundation you need to evaluate the rest of the factors that influence home affordability.

2. Monthly debt obligations

Your monthly debt obligations play a major role in determining how much house you can afford. Lenders use these recurring payments to calculate your debt-to-income (DTI) ratio, one of the most important metrics for evaluating mortgage applications and determining how much you can borrow.

Include the minimum monthly payment for each recurring debt, such as:

• Credit cards
• Auto loans
• Student loans
• Personal loans
• Child support

Don't include everyday living expenses such as groceries, utilities, insurance premiums or streaming subscriptions. Although these costs affect your monthly budget, lenders typically exclude them when calculating your DTI ratio. Even so, they still play an important role in determining how much house you can afford.

3. Down payment savings

Your down payment affects both the size of your mortgage and your monthly payment. Many home loan programs allow qualified buyers to put down as little as 3%. Meanwhile, a 20% down payment typically eliminates the need for private mortgage insurance (PMI).

In general, making a larger down payment means a smaller loan, a lower monthly mortgage payment and, in many cases, a lower interest rate. If saving for a down payment feels challenging, explore available down payment assistance programs to see whether you qualify.

4. Credit score

A strong credit score can help you qualify for a lower mortgage interest rate, which directly affects how much house you can afford. Even a 20-point difference could significantly change your monthly payment and the total cost of your loan over time.

For many first-time homebuyers, FHA loans are available with credit scores of 580 or higher. Conventional loans typically require a credit score of at least 620, although lender requirements can vary.

5. Interest rate

Mortgage interest rates aren't entirely within your control as a homebuyer. However, factors such as your credit score, loan type and lender all influence the rate you may qualify for, which directly affects your monthly payment and overall borrowing costs.

Interest rates also change as market conditions shift. If your lender offers a rate lock as part of the prequalification or mortgage application process, it can help protect you from rising rates while you shop for a home in a competitive market.

How to apply the 28/36 rule and when to adjust it

The 28/36 rule is a common guideline for estimating home affordability. It suggests spending no more than 28% of your gross monthly income on housing costs and no more than 36% on total monthly debt, including your mortgage.

For example, if you earn $80,000 per year, your gross monthly income is about $6,667. Using the 28% guideline, your monthly housing costs should stay at or below about $1,867.

The 28/36 rule is only a starting point. If you have variable income, expect major expenses in the near future or want to prioritize retirement or other savings goals, a more conservative housing budget of 22% to 25% of your gross monthly income may make more sense. Think of the 28/36 rule as a guideline to help estimate a comfortable homebuying budget. Lenders will work closely with you to evaluate your full financial picture.

A step-by-step method to estimate your number

Once you've gathered the information above, you're ready to estimate how much house you can afford. You can calculate the numbers yourself or use a home affordability calculator to simplify the process.

1. Calculate your gross monthly income. Add all household income before taxes.
2. List your monthly debt payments. Total the minimum monthly payments for all recurring debt obligations.
3. Apply the 28% rule. Multiply your gross monthly income by 0.28 to estimate your maximum monthly housing cost.
4. Apply the 36% rule. Multiply your gross monthly income by 0.36, then subtract your monthly debt payments. The result is the estimated maximum housing payment that keeps your total debt within the 36% guideline.
5. Estimate your loan amount. Use your down payment savings to estimate how much you can borrow. A larger down payment reduces your loan amount, lowers your monthly payment and may eliminate PMI.
6. Stress-test your budget. Ask yourself whether the payment still leaves room for savings, emergencies and other financial goals. If not, lower your target home price instead of stretching your budget.

Your affordability number is the beginning, not the end

Buying a home is an exciting milestone but choosing a home loan payment that meets your financial priorities is more important than borrowing the maximum amount a lender approves. By evaluating your income, debt obligations, down payment savings, credit score and estimated interest rate, you can build a budget that supports both your homeownership goals and your long-term financial well-being.

Once you have an affordability estimate, you can take the next step with greater confidence. Explore Citizens mortgage options, affordability tools and prequalification resources to move forward with confidence.