Hourly Rate Tax Calculator Australia

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Home Affordability Calculator

Estimate the maximum home price you can afford based on your income and debts.

30 Years 20 Years 15 Years 10 Years

Estimated Maximum Budget

$0

Est. Monthly Payment

$0

Mortgage Amount

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How Much House Can I Afford?

Determining your home buying budget is the most critical step in the real estate journey. While a bank might approve you for a high loan amount, true affordability depends on your daily lifestyle, future goals, and current debt obligations.

The 28/36 Rule Explained

Financial advisors often use the 28/36 Rule to calculate home affordability:

  • Front-End Ratio (28%): Your total monthly housing costs (mortgage, taxes, and insurance) should not exceed 28% of your gross monthly income.
  • Back-End Ratio (36%): Your total debt obligations (including the new mortgage, car loans, credit cards, and student loans) should not exceed 36% of your gross monthly income.

Key Factors Influencing Your Budget

  1. Gross Annual Income: This is your total income before taxes. Lenders use this to establish your baseline borrowing capacity.
  2. Debt-to-Income (DTI) Ratio: High existing debts like student loans or car payments directly reduce the amount a bank will lend you for a home.
  3. Down Payment: The more you put down, the lower your monthly payment and the higher the home price you can target. A 20% down payment also allows you to avoid Private Mortgage Insurance (PMI).
  4. Interest Rates: Even a 1% change in interest rates can shift your purchasing power by tens of thousands of dollars.

Real-World Example

If a household earns $100,000 per year with $500 in monthly debts and has a $40,000 down payment:

  • Gross Monthly Income: $8,333
  • 36% DTI Limit: $3,000 total debt capacity.
  • Available for Housing: $3,000 – $500 = $2,500 monthly payment.
  • At a 6.5% interest rate, this supports a mortgage of roughly $395,000.
  • Total Affordable Home Price: $435,000.
function calculateAffordability() { var annualIncome = parseFloat(document.getElementById('annualIncome').value); var monthlyDebt = parseFloat(document.getElementById('monthlyDebt').value) || 0; var downPayment = parseFloat(document.getElementById('downPayment').value) || 0; var interestRate = parseFloat(document.getElementById('interestRate').value); var loanTerm = parseInt(document.getElementById('loanTerm').value); var dtiRatio = parseFloat(document.getElementById('dtiRatio').value) / 100; if (!annualIncome || !interestRate || !loanTerm) { alert("Please enter valid income, interest rate, and loan term values."); return; } // 1. Calculate Monthly Gross Income var monthlyGross = annualIncome / 12; // 2. Calculate Maximum Total Monthly Debt Allowed (Back-end Ratio) var maxTotalMonthlyDebt = monthlyGross * dtiRatio; // 3. Subtract current debts to find available Monthly Payment (PITI) // We estimate taxes and insurance account for ~15% of the monthly payment capacity var availableForPITI = maxTotalMonthlyDebt – monthlyDebt; // Safety check for negative values if (availableForPITI <= 0) { document.getElementById('maxPrice').innerText = "Insufficient Income"; document.getElementById('maxPrice').style.color = "#e74c3c"; document.getElementById('monthlyPayment').innerText = "$0"; document.getElementById('loanAmount').innerText = "$0"; document.getElementById('affordabilityResult').style.display = "block"; return; } // Estimate Principal & Interest (P&I) by removing ~20% for Taxes/Insurance/HOA var availableForPI = availableForPITI * 0.80; // 4. Calculate Loan Amount using the present value of an annuity formula // Loan = P * [(1 – (1 + r)^-n) / r] var monthlyRate = (interestRate / 100) / 12; var numberOfPayments = loanTerm * 12; var maxLoan = availableForPI * ((1 – Math.pow(1 + monthlyRate, -numberOfPayments)) / monthlyRate); // 5. Calculate Total Home Price var totalHomePrice = maxLoan + downPayment; // 6. Format and Display Results document.getElementById('maxPrice').style.color = "#27ae60"; document.getElementById('maxPrice').innerText = "$" + Math.round(totalHomePrice).toLocaleString(); document.getElementById('monthlyPayment').innerText = "$" + Math.round(availableForPITI).toLocaleString(); document.getElementById('loanAmount').innerText = "$" + Math.round(maxLoan).toLocaleString(); document.getElementById('affordabilityResult').style.display = "block"; // Scroll to result document.getElementById('affordabilityResult').scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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