Federal Tax Withholding Rate Calculator
.calculator-widget-container {
font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #fff;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 30px;
box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 25px;
}
@media (max-width: 600px) {
.calc-grid { grid-template-columns: 1fr; }
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #333;
font-size: 14px;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
transition: border-color 0.3s;
}
.input-group input:focus {
border-color: #0073aa;
outline: none;
}
.calc-btn {
width: 100%;
padding: 15px;
background-color: #0073aa;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
.calc-btn:hover {
background-color: #005177;
}
.results-area {
margin-top: 30px;
padding: 20px;
background-color: #f9f9f9;
border-radius: 6px;
border-left: 5px solid #0073aa;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
color: #555;
font-weight: 500;
}
.result-value {
font-weight: 700;
color: #333;
font-size: 18px;
}
.big-result {
font-size: 24px;
color: #0073aa;
}
.seo-content-area {
margin-top: 50px;
line-height: 1.6;
color: #444;
}
.seo-content-area h2 {
color: #2c3e50;
margin-top: 30px;
}
.seo-content-area h3 {
color: #34495e;
margin-top: 20px;
}
.seo-content-area ul {
margin-left: 20px;
}
function calculateRentalROI() {
// 1. Get Inputs
var purchasePrice = parseFloat(document.getElementById("purchasePrice").value);
var downPercent = parseFloat(document.getElementById("downPaymentPercent").value);
var interestRate = parseFloat(document.getElementById("interestRate").value);
var loanTerm = parseFloat(document.getElementById("loanTerm").value);
var closingCosts = parseFloat(document.getElementById("closingCosts").value);
var monthlyRent = parseFloat(document.getElementById("monthlyRent").value);
var annualTax = parseFloat(document.getElementById("annualTax").value);
var annualInsurance = parseFloat(document.getElementById("annualInsurance").value);
var monthlyHOA = parseFloat(document.getElementById("monthlyHOA").value);
var vacancyRate = parseFloat(document.getElementById("vacancyRate").value);
// Validate inputs
if (isNaN(purchasePrice) || isNaN(monthlyRent)) {
alert("Please enter at least the Purchase Price and Monthly Rent to calculate.");
return;
}
// Set defaults for optional fields if empty/NaN to avoid breaking math
if (isNaN(downPercent)) downPercent = 0;
if (isNaN(interestRate)) interestRate = 0;
if (isNaN(closingCosts)) closingCosts = 0;
if (isNaN(annualTax)) annualTax = 0;
if (isNaN(annualInsurance)) annualInsurance = 0;
if (isNaN(monthlyHOA)) monthlyHOA = 0;
if (isNaN(vacancyRate)) vacancyRate = 0;
// 2. Calculate Financials
var downPaymentAmount = purchasePrice * (downPercent / 100);
var loanAmount = purchasePrice – downPaymentAmount;
var totalInitialInvestment = downPaymentAmount + closingCosts;
// Mortgage Calculation (Principal & Interest)
var monthlyPI = 0;
if (loanAmount > 0 && interestRate > 0) {
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
monthlyPI = loanAmount * monthlyRate * (Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
// Monthly Expenses
var monthlyTax = annualTax / 12;
var monthlyInsurance = annualInsurance / 12;
var vacancyLoss = monthlyRent * (vacancyRate / 100);
var totalMonthlyExpenses = monthlyPI + monthlyTax + monthlyInsurance + monthlyHOA + vacancyLoss;
// Net Operating Income (NOI) = Income – Operating Expenses (Excluding Debt Service)
var annualOperatingExpenses = (monthlyTax + monthlyInsurance + monthlyHOA + vacancyLoss) * 12;
var annualRent = monthlyRent * 12;
var noi = annualRent – annualOperatingExpenses;
// Cash Flow
var monthlyCashFlow = monthlyRent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
// ROI Metrics
var cashOnCashROI = 0;
if (totalInitialInvestment > 0) {
cashOnCashROI = (annualCashFlow / totalInitialInvestment) * 100;
}
var capRate = 0;
if (purchasePrice > 0) {
capRate = (noi / purchasePrice) * 100;
}
// 3. Display Results
document.getElementById("displayROI").innerText = cashOnCashROI.toFixed(2) + "%";
document.getElementById("displayCashFlow").innerText = "$" + monthlyCashFlow.toFixed(2);
document.getElementById("displayCapRate").innerText = capRate.toFixed(2) + "%";
document.getElementById("displayInvestment").innerText = "$" + totalInitialInvestment.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("displayExpenses").innerText = "$" + totalMonthlyExpenses.toFixed(2);
// Style adjustments for negative flow
if(monthlyCashFlow < 0) {
document.getElementById("displayCashFlow").style.color = "#d63031";
} else {
document.getElementById("displayCashFlow").style.color = "#00b894";
}
// Show results div
document.getElementById("roiResults").style.display = "block";
}