How Much House Can I Afford?
How much house you can afford depends on more than income alone. Gross household income establishes the starting point for housing costs, while recurring monthly debts reduce the amount available. Your down payment, mortgage rate, and loan term then affect how large a mortgage that budget can support.
Property taxes, homeowners insurance, PMI, and HOA fees can also make a meaningful difference because they are part of the total monthly housing cost. Two households earning the same income may therefore have very different home-buying power if one has more debt, a smaller down payment, a higher mortgage rate, or higher ongoing property expenses.
The calculator above combines these factors to estimate an affordable home price under Comfortable, Target, and Higher Limit planning scenarios rather than relying on a simple income multiple.
How to Use the Mortgage Affordability Calculator
Start by entering your gross annual household income and recurring monthly debt payments. Add your available down payment, then enter the mortgage interest rate and choose a loan term. For a more complete estimate, expand the advanced housing costs to adjust property taxes, homeowners insurance, PMI, and HOA fees.
Your results update as you change the inputs. Use the Target scenario as the default planning estimate, then compare it with Comfortable for a more conservative estimate and Higher Limit for a higher housing and debt scenario. Review the estimated home price, mortgage amount, monthly housing payment, debt-to-income ratios, and limiting factor to understand what is driving your affordability estimate.
How Mortgage Affordability Is Calculated
Income and Monthly Debts
The calculation starts with your gross household income before taxes and other deductions. Annual income is converted to a monthly amount so it can be compared with your monthly housing costs and recurring debt payments.
Monthly debts should include ongoing obligations such as auto loans, student loans, credit card minimum payments, personal loans, and other recurring debt payments. Ordinary living expenses such as groceries, utilities, and transportation costs are not included as monthly debts in this calculator. However, those expenses still affect what may be comfortable for your household to spend on housing.
Higher recurring debt leaves less room for housing within the calculator's affordability limits, while lower debt generally increases the amount available for housing.
Housing Ratio and Debt-to-Income Ratio
The calculator uses two ratios to estimate how much of your gross monthly income can go toward housing. The housing ratio compares your estimated monthly housing payment with your gross monthly income. The total debt-to-income ratio (DTI) compares your housing payment plus recurring monthly debts with your gross monthly income.
The calculator applies both limits and uses the lower allowable housing payment to estimate an affordable home price.
For example, a household with relatively little existing debt may be limited by the housing ratio, while higher monthly debt payments can cause the total DTI limit to become more restrictive.
The result identifies this more restrictive constraint as your Limiting Factor. The Comfortable, Target, and Higher Limit scenarios use different planning ratios so you can compare affordability under different assumptions. These ratios are planning benchmarks, not universal mortgage qualification requirements; actual lender and loan-program requirements vary.
Down Payment
Your down payment affects both the amount you need to borrow and the loan-to-value ratio (LTV). A larger down payment reduces the mortgage amount needed for a given home price, which can increase the home price supported by the calculator's available housing budget.
The down payment can also affect estimated private mortgage insurance (PMI). When the calculated loan-to-value ratio is above 80%, the calculator may include estimated PMI as part of the monthly housing payment. Because PMI uses part of the available housing budget, it can reduce the mortgage amount and home price supported by the affordability estimate.
Interest Rate and Loan Term
The mortgage interest rate and loan term determine how much principal and interest must be paid each month for a given loan amount. When the interest rate increases, more of the available housing budget is needed to support the same mortgage balance, so the calculator will generally estimate a lower affordable home price. A lower rate can support a larger mortgage within the same monthly budget.
The loan term affects the calculation in a similar way. A shorter term repays the mortgage over fewer years and generally requires a higher monthly principal-and-interest payment for the same loan amount. A longer term spreads repayment over more monthly payments, which generally allows a larger mortgage to fit within the same housing budget.
Property Taxes, Insurance, PMI and HOA Fees
Mortgage affordability depends on the total monthly housing payment, not just principal and interest. The calculator includes estimated property taxes and homeowners insurance, along with PMI when applicable and any monthly HOA fees you enter. These costs use part of the housing budget established by the selected affordability scenario.
Higher property taxes, insurance premiums, PMI, or HOA fees leave less of that budget available for principal and interest, which can reduce the mortgage amount and home price the calculator estimates as affordable. Because these expenses can vary considerably by property, location, loan, and borrower, the calculator allows you to adjust its housing-cost assumptions to produce an estimate that better reflects the home or area you are considering.
Understanding Your Affordability Results
The calculator provides three estimates so you can see how different housing and debt assumptions affect your potential home-buying power. Each scenario applies both a housing ratio and a total debt-to-income ratio, with the more restrictive limit determining the housing budget used to estimate an affordable home price.
These percentages are planning assumptions used by this calculator, not universal mortgage underwriting limits or predictions of how much a lender will approve.
Comfortable
The Comfortable scenario uses a housing ratio of 25% and a total DTI limit of 33%. It provides the most conservative of the three estimates by allowing a smaller portion of gross monthly income to be used for housing and recurring debt.
This scenario is intended to show how the estimated affordable home price changes when lower housing and debt ratios are used. It does not determine what a household should spend, since expenses and financial priorities outside the calculator can vary substantially.
Target
The Target scenario uses a housing ratio of 28% and a total DTI limit of 36%. It serves as the calculator's default planning scenario and provides a middle point between the Comfortable and Higher Limit estimates.
Whichever constraint is more restrictive becomes the limiting factor. Existing debt may cause the 36% total DTI limit to bind first, while the 28% housing limit may be more restrictive for households with less debt.
Higher Limit
The Higher Limit scenario uses a housing ratio of 31% and a total DTI limit of 43%. Because it allows a larger share of gross monthly income for housing and recurring debt, it generally produces the highest of the three affordability estimates.
Higher Limit is provided for comparison purposes. It is not a recommendation to spend more, a mortgage qualification result, or a prediction that a lender will approve the estimated mortgage amount. Actual underwriting requirements vary by lender, loan program, borrower, and other factors.
What Can Increase or Reduce How Much House You Can Afford?
Changes to your income, monthly debts, down payment, or mortgage rate can change the home price supported by the same affordability assumptions. Higher income generally increases the housing and debt budgets available in the calculation, while lower recurring debt leaves more room within the total DTI limit. A larger down payment can reduce the mortgage amount needed for a given home price, and a lower interest rate can allow more mortgage principal to fit within the available monthly housing budget.
The opposite changes can reduce estimated buying power. Higher monthly debt or a higher mortgage rate can lower the home price supported by the calculation, while higher property taxes, homeowners insurance, PMI, or HOA fees leave less of the housing budget available for principal and interest.
Use the buying-power scenarios above to compare how changes in rate, down payment, debt, or income could affect your estimated affordable home price before changing your calculator inputs.
Mortgage Affordability Example
Consider a household with the following information:
- Gross annual household income
- $100,000
- Monthly debt payments
- $750
- Down payment
- $50,000
- Mortgage interest rate
- 6.50%
- Loan term
- 30 years
- Property tax rate
- 1.20% per year
- Homeowners insurance rate
- 0.35% per year
- HOA fees
- $0 per month
- PMI rate
- 0.50% per year when applicable
- Target scenario
- 28% housing / 36% total DTI
Using the calculator's Target scenario of a 28% housing ratio and 36% total DTI limit, these inputs produce an estimated affordable home price of $322,000 and an estimated mortgage amount of $272,190. The estimated total monthly housing payment is $2,250, including principal and interest and the applicable estimated property taxes, homeowners insurance, PMI, and HOA fees.
In this example, Total debt-to-income ratio is the limiting factor. The example shows how income establishes the available budget while debt, down payment, mortgage terms, and housing expenses determine the home price that budget can support.
Mortgage Affordability vs. Mortgage Qualification
Mortgage affordability and mortgage qualification answer different questions. An affordability estimate considers your income, recurring debts, down payment, mortgage assumptions, and estimated housing expenses to help determine a home price that fits within the planning ratios used by this calculator.
Mortgage qualification is a lender's determination of how much you may be eligible to borrow. That decision can depend on verified income and employment, assets, debts, credit profile, the loan program, the property, and other underwriting requirements. Different lenders and loan programs may also apply different standards.
Because of these differences, the affordable home price shown by this calculator should not be interpreted as a loan approval or guaranteed borrowing amount. It is a planning estimate designed to help you explore potential home-buying budgets before making financing decisions.
For details about the equations, assumptions, and calculation approach used across the site, see our methodology. You can also use the main Mortgage Calculator when your goal is to estimate a monthly payment for a specific home price instead of solving for an affordable home price.
Frequently Asked Questions About Mortgage Affordability
How much house can I afford?
The calculator estimates how much house you can afford from your income, recurring debts, down payment, mortgage rate, loan term, housing costs, and selected affordability scenario rather than relying on income alone.
What income should I use in a mortgage affordability calculator?
Use your gross annual household income before taxes and other deductions. If you are buying with a co-borrower and expect their income to be part of the household finances used for the mortgage, include that income when entering the household total.
What monthly debts should I include?
Include recurring debt payments such as auto loans, student loans, credit card minimum payments, personal loans, and other continuing debt obligations. Do not enter ordinary living expenses such as groceries and utilities as monthly debt, although those expenses still matter when deciding what housing payment is comfortable for your budget.
What debt-to-income ratio is used to estimate affordability?
The calculator uses different planning assumptions for each scenario. Comfortable uses 25% housing and 33% total DTI, Target uses 28% and 36%, and Higher Limit uses 31% and 43%. These are calculator assumptions for comparing affordability estimates, not universal lender qualification requirements.
Does a larger down payment increase how much house I can afford?
A larger down payment can increase the home price supported by the calculator because less mortgage financing is required for a given purchase price. It can also lower the loan-to-value ratio and may reduce estimated PMI, leaving more of the available housing budget for principal and interest.
How do mortgage rates affect home affordability?
A higher mortgage rate generally increases the principal-and-interest payment required for the same loan amount, which can reduce the mortgage and home price supported by a fixed housing budget. A lower rate generally allows more mortgage principal to fit within that same monthly budget.
Is mortgage affordability the same as mortgage qualification?
No. Affordability is a planning estimate based on the calculator's assumptions, while qualification is determined by a lender using underwriting requirements and verified borrower, loan, and property information. An affordability estimate is not a mortgage approval.