Home Loan Emi Calculator Excel Sheet with Variable Interest Rate

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Home Affordability Calculator

30-Year Fixed 20-Year Fixed 15-Year Fixed 10-Year Fixed

Estimated Max Home Price

$0
Monthly Payment (P&I) $0
Total Loan Amount $0
DTI Ratio 0%

How Is Home Affordability Calculated?

Determining "how much house you can afford" involves more than just looking at your bank account. Lenders primarily use the 28/36 Rule to assess your borrowing capacity. This rule suggests that your mortgage payment should not exceed 28% of your gross monthly income, and your total debt obligations (including the new mortgage) should not exceed 36%.

Key Factors Influencing Your Budget

  • Gross Annual Income: This is your total income before taxes. Lenders use this as the starting point for all debt-to-income (DTI) calculations.
  • Debt-to-Income Ratio (DTI): This is the percentage of your monthly income that goes toward paying debts. A lower DTI usually qualifies you for better interest rates and higher loan amounts.
  • Down Payment: The more you put down upfront, the lower your monthly loan payment will be, and the higher the home price you can target.
  • Interest Rates: Even a 1% difference in interest rates can change your purchasing power by tens of thousands of dollars over a 30-year term.

Real-World Example Calculation

Suppose your household earns $100,000 per year. Your gross monthly income is $8,333. Using the 28% rule, your maximum monthly housing payment (including taxes and insurance) should be approximately $2,333.

If you have $500 in existing monthly debts (like a car payment), your total debt-to-income limit (36%) would be $3,000. Since $2,333 (housing) + $500 (debt) = $2,833, you are well within the 36% limit. Based on a 6.5% interest rate and a $20,000 down payment, you could likely afford a home priced around $335,000.

Tips to Increase Your Affordability

If the calculator shows a lower number than you hoped, consider these strategies: 1. Reduce your existing monthly recurring debts. 2. Improve your credit score to secure a lower interest rate. 3. Save for a larger down payment to reduce the total interest paid over the life of the loan.

function calculateAffordability() { var annualIncome = parseFloat(document.getElementById('afford-income').value); var downPayment = parseFloat(document.getElementById('afford-downpayment').value); var monthlyDebt = parseFloat(document.getElementById('afford-debt').value); var annualRate = parseFloat(document.getElementById('afford-rate').value); var loanTermYears = parseFloat(document.getElementById('afford-term').value); var monthlyTaxIns = parseFloat(document.getElementById('afford-tax').value); if (isNaN(annualIncome) || isNaN(downPayment) || isNaN(monthlyDebt) || isNaN(annualRate) || isNaN(monthlyTaxIns)) { alert("Please enter valid numeric values for all fields."); return; } var monthlyGrossIncome = annualIncome / 12; // 28/36 Rule Logic var maxHousingPaymentByIncome = monthlyGrossIncome * 0.28; var maxTotalDebtPayment = monthlyGrossIncome * 0.36; var maxHousingPaymentByDebt = maxTotalDebtPayment – monthlyDebt; // Choose the more conservative of the two var maxTotalMonthlyHousing = Math.min(maxHousingPaymentByIncome, maxHousingPaymentByDebt); // Subtract taxes and insurance to find what's left for Principal and Interest (P&I) var availablePI = maxTotalMonthlyHousing – monthlyTaxIns; if (availablePI <= 0) { document.getElementById('max-home-price').innerHTML = "Insufficient Income"; document.getElementById('monthly-pi').innerHTML = "$0"; document.getElementById('total-loan').innerHTML = "$0"; document.getElementById('dti-ratio').innerHTML = "N/A"; return; } // Mortgage formula for Loan Amount: L = P * [ (1 – (1+r)^-n) / r ] var monthlyRate = (annualRate / 100) / 12; var totalPayments = loanTermYears * 12; var loanAmount = availablePI * ((1 – Math.pow(1 + monthlyRate, -totalPayments)) / monthlyRate); var maxHomePrice = loanAmount + downPayment; // DTI Calculation for display var totalMonthlyCommitment = availablePI + monthlyTaxIns + monthlyDebt; var dti = (totalMonthlyCommitment / monthlyGrossIncome) * 100; // Formatting var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', maximumFractionDigits: 0 }); document.getElementById('max-home-price').innerHTML = formatter.format(maxHomePrice); document.getElementById('monthly-pi').innerHTML = formatter.format(availablePI); document.getElementById('total-loan').innerHTML = formatter.format(loanAmount); document.getElementById('dti-ratio').innerHTML = dti.toFixed(1) + "%"; } // Run once on load to show initial state window.onload = function() { calculateAffordability(); };

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