How to Calculate Home Tax Rate

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Home Affordability Calculator

You can afford a home up to:
Estimated Monthly Payment (P&I):
Estimated Monthly Tax & Insurance:
Total Monthly Payment:
Debt-to-Income (DTI) Ratio: 36%

How Home Affordability is Calculated

Lenders typically use the 28/36 rule to determine how much they are willing to lend you. This rule suggests that your mortgage payment should not exceed 28% of your gross monthly income, and your total debt payments (including the new mortgage) should not exceed 36% to 43% of your income.

Key Factors in Your Home Budget

  • Gross Annual Income: Your total earnings before taxes and deductions. This is the baseline for all affordability calculations.
  • Debt-to-Income (DTI) Ratio: This compares your monthly debt obligations to your monthly income. A lower DTI indicates a lower risk to lenders.
  • Down Payment: The cash you pay upfront. A higher down payment reduces your loan amount and can eliminate the need for Private Mortgage Insurance (PMI).
  • Interest Rates: Even a 1% difference in interest rates can change your purchasing power by tens of thousands of dollars.

Example Calculation

If you earn $100,000 per year, your gross monthly income is $8,333. Using a 36% DTI limit, your total monthly debt (including the mortgage) should stay under $3,000. If you already pay $500/month for a car loan, your maximum mortgage payment would be roughly $2,500.

How to Increase Your Purchasing Power

To afford a more expensive home, you can focus on three main areas: reducing your existing monthly debts, increasing your credit score to secure a lower interest rate, or saving for a larger down payment. Small changes in your financial profile can lead to significant increases in the home price you can afford.

function calculateAffordability() { var annualIncome = parseFloat(document.getElementById("annualIncome").value); var monthlyDebt = parseFloat(document.getElementById("monthlyDebt").value); var downPayment = parseFloat(document.getElementById("downPayment").value); var interestRate = parseFloat(document.getElementById("interestRate").value) / 100 / 12; var loanTermYears = parseFloat(document.getElementById("loanTerm").value); var taxInsuranceRate = (parseFloat(document.getElementById("taxRate").value) / 100) / 12; if (isNaN(annualIncome) || isNaN(monthlyDebt) || isNaN(downPayment) || isNaN(interestRate) || isNaN(loanTermYears)) { alert("Please enter valid numeric values in all fields."); return; } var monthlyGrossIncome = annualIncome / 12; var totalMonths = loanTermYears * 12; // We use a 36% DTI cap for a "Conservative/Standard" estimate var maxTotalMonthlyAllowed = monthlyGrossIncome * 0.36; var maxMonthlyBudgetForMortgage = maxTotalMonthlyAllowed – monthlyDebt; if (maxMonthlyBudgetForMortgage <= 0) { alert("Your current debts are too high relative to your income for a standard mortgage calculation."); return; } // Since Total Payment = P&I + (Price * TaxRate) // and P&I = (Price – DownPayment) * [i(1+i)^n / ((1+i)^n – 1)] // var M = Max Monthly Budget // var r = Monthly Interest Rate // var t = Monthly Tax/Insurance Rate // var D = Down Payment // var P = Home Price // var K = [r(1+r)^n / ((1+r)^n – 1)] // M = (P – D) * K + P * t // M = PK – DK + Pt // M + DK = P(K + t) // P = (M + DK) / (K + t) var kFactor = (interestRate * Math.pow(1 + interestRate, totalMonths)) / (Math.pow(1 + interestRate, totalMonths) – 1); var maxHomePrice = (maxMonthlyBudgetForMortgage + (downPayment * kFactor)) / (kFactor + taxInsuranceRate); var loanAmount = maxHomePrice – downPayment; var monthlyPI = loanAmount * kFactor; var monthlyTI = maxHomePrice * taxInsuranceRate; var totalMonthly = monthlyPI + monthlyTI; // Output formatting document.getElementById("maxHomePrice").innerText = "$" + Math.round(maxHomePrice).toLocaleString(); document.getElementById("monthlyPI").innerText = "$" + Math.round(monthlyPI).toLocaleString(); document.getElementById("monthlyTI").innerText = "$" + Math.round(monthlyTI).toLocaleString(); document.getElementById("totalMonthly").innerText = "$" + Math.round(totalMonthly).toLocaleString(); document.getElementById("affordabilityResult").style.display = "block"; // Smooth scroll to result document.getElementById("affordabilityResult").scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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