Mortgage Affordability Calculator

The 28/36 Rule Used In This Estimate

This calculator uses two common conventional-style affordability limits: housing payment up to 28% of gross monthly income, and total monthly debt payments up to 36% of gross monthly income. The housing limit is called the front-end ratio; the total-debt limit is called the back-end debt-to-income ratio.

The formula calculates both limits, subtracts existing monthly debts from the 36% back-end allowance, and uses the smaller number as the target monthly housing payment. That payment is then converted into an estimated mortgage balance using the interest rate and loan term, and your down payment is added back to estimate a possible home price.

For example, a household with $9,000 of gross monthly income has a 28% housing limit of $2,520. If the same household has $900 of existing debt, the 36% back-end limit leaves $2,340 for housing, so the debt-adjusted figure controls the estimate.

Loan Programs Can Use Different Ratios

The 28/36 rule is a conservative planning shortcut, not a universal underwriting rule. FHA, VA, USDA, jumbo, and portfolio lenders can use different debt-ratio guidelines, compensating factors, residual-income tests (minimum after-housing cash requirements), credit overlays, or manual underwriting rules.

FHA-style discussions often reference higher ratios such as 31/43, while VA underwriting focuses heavily on residual income and does not work like a simple fixed front-end cap. Jumbo lenders may be stricter on reserves and credit, even when the visible debt ratio looks acceptable.

Because rules and lender overlays vary, use this calculator to set a starting range and then verify the loan-specific ceiling with a lender. If a lender approves more than this estimate, still compare the payment with take-home pay, emergency savings, and the rest of your life budget.

Inputs To Verify Before Shopping

Use stable gross monthly income for the lender-style estimate, then compare the result with take-home pay. Gross income is what many lender ratios start from, but a household in a high-tax area may see take-home pay 30% to 35% lower than gross income once taxes, retirement contributions, insurance, and payroll deductions are removed.

Enter recurring monthly debts such as student loans, auto loans, credit card minimums, personal loans, and other obligations that appear in debt-to-income analysis. Do not ignore a payment just because it will end someday unless it is truly close to payoff and a lender has confirmed how it will be treated.

Use a realistic interest rate and loan term. A stale low-rate assumption can overstate affordability, while a short-term loan may reduce lifetime interest but sharply reduce the home price supported by the same monthly payment.

HOA Dues And Other Housing Charges

The calculator does not have a separate HOA field, so it estimates affordability from a target housing payment before every property-specific charge is modeled. In real underwriting, HOA dues are often included in the housing payment or total debt calculation, depending on the loan program and lender.

If the home has HOA dues, condo fees, special assessments, or required community charges, subtract a conservative monthly estimate from the target payment before deciding what mortgage payment is affordable. A $300 monthly HOA can reduce mortgage borrowing power by tens of thousands of dollars.

After estimating a home price here, run the payment through the Mortgage Payment Calculator with property tax and insurance, then add HOA dues manually to see the full monthly housing cost. The affordability number is most useful when it is followed by a complete monthly payment check.

Down Payment Is Not The Only Cash Need

Down payment increases buying power, but closing costs, prepaid taxes, homeowner's insurance, moving costs, inspections, repairs, and initial furnishings also need cash. Closing costs commonly land around 2% to 5% of the loan amount, depending on the lender, property, points, title charges, and local taxes.

A buyer who uses all available cash for the down payment may technically qualify but enter homeownership without resilience. That is risky because repairs, escrow changes, appliance replacement, and moving expenses tend to arrive early.

Keep emergency savings separate from purchase cash when judging affordability. If raising the down payment empties reserves, a slightly lower purchase price can be financially healthier than a larger loan approval.

Affordability Beyond The Mortgage

The maximum supported home price is not the same as a comfortable home price. Property tax, homeowner's insurance, PMI, HOA dues, utilities, repairs, lawn care, commuting, and maintenance can make two homes with similar prices feel very different month to month.

As rough planning ranges, property tax can be around 0.5% to 2.5% of home value per year depending on location, homeowner's insurance may run around 0.5% to 1%, and maintenance is often budgeted with a 1% of home value rule of thumb. PMI may also apply when a conventional down payment is below 20%.

Older homes may need more maintenance, while newer homes may carry higher taxes, HOA dues, or special assessments. The comfortable home price is often lower than the maximum approved price, especially for buyers with variable income or limited cash reserves.

Mortgage Affordability Mistakes

Do not shop from preapproval alone. Preapproval is a lender screen, not a lifestyle plan, and it usually depends on a credit check, income verification, asset documentation, employment history, and loan-program rules.

Do not ignore future changes such as child care, car replacement, insurance increases, income uncertainty, medical costs, or planned career shifts. A payment that works today can become tight if another major cost arrives after closing.

Do not assume refinancing will rescue an uncomfortable payment later. Rates, home values, credit scores, income, and closing costs can all prevent a refinance from working when you need it most.

Affordability Scenarios To Run

Run a higher-rate scenario before touring homes. A one-point rate increase can materially reduce borrowing power because the same monthly payment supports a smaller loan.

Run a lower-down-payment scenario after estimating closing costs and reserves. Sometimes keeping $15,000 more cash on hand is more valuable than using every dollar to push the home price higher.

Run a one-income or reduced-income scenario if household income could change. This is especially useful for buyers planning children, business ownership, graduate school, caregiving, or a move from commission income to salary.

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