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Rental Property Cash Flow Calculator | Real Estate Investment Analysis :root { –primary-color: #2c7a7b; –secondary-color: #285e61; –bg-color: #f7fafc; –text-color: #2d3748; –border-color: #e2e8f0; –white: #ffffff; } body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: var(–text-color); background-color: var(–bg-color); margin: 0; padding: 20px; } .container { max-width: 1000px; margin: 0 auto; } .calculator-wrapper { background: var(–white); border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); padding: 30px; margin-bottom: 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; } @media (max-width: 768px) { .calculator-wrapper { grid-template-columns: 1fr; } } h1 { text-align: center; color: var(–secondary-color); margin-bottom: 30px; } h2 { color: var(–secondary-color); border-bottom: 2px solid var(–border-color); padding-bottom: 10px; margin-top: 30px; } .input-group { margin-bottom: 15px; } .input-group label { display: block; font-weight: 600; margin-bottom: 5px; font-size: 0.9em; } .input-group input, .input-group select { width: 100%; padding: 10px; border: 1px solid var(–border-color); border-radius: 4px; font-size: 16px; box-sizing: border-box; } .section-title { font-weight: bold; color: var(–primary-color); margin-top: 20px; margin-bottom: 10px; font-size: 1.1em; } button.calc-btn { background-color: var(–primary-color); color: white; border: none; padding: 15px 30px; font-size: 18px; font-weight: bold; border-radius: 4px; cursor: pointer; width: 100%; margin-top: 20px; transition: background-color 0.2s; } button.calc-btn:hover { background-color: var(–secondary-color); } .results-container { background-color: #f0fff4; border: 1px solid #c6f6d5; border-radius: 8px; padding: 20px; } .result-row { display: flex; justify-content: space-between; margin-bottom: 10px; padding-bottom: 10px; border-bottom: 1px dashed #cbd5e0; } .result-row:last-child { border-bottom: none; } .result-label { font-weight: 600; } .result-value { font-weight: bold; } .big-result { font-size: 1.5em; color: var(–primary-color); text-align: right; } .negative { color: #e53e3e; } .positive { color: #38a169; } .article-content { background: var(–white); padding: 40px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.05); } .metric-card { background: white; padding: 15px; border-radius: 6px; margin-top: 15px; border-left: 4px solid var(–primary-color); box-shadow: 0 1px 3px rgba(0,0,0,0.1); } { "@context": "https://schema.org", "@type": "SoftwareApplication", "name": "Rental Property Cash Flow Calculator", "applicationCategory": "FinanceApplication", "operatingSystem": "All", "offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" }, "description": "Calculate monthly cash flow, Net Operating Income (NOI), and Cash-on-Cash Return for rental properties." }

Rental Property Cash Flow Calculator

Purchase Information
Income Information
Monthly Expenses

Monthly Cash Flow

Gross Income: $0.00
Vacancy Loss: -$0.00
Operating Expenses: -$0.00
Net Operating Income (NOI): $0.00
Mortgage Payment (P&I): -$0.00
Monthly Cash Flow: $0.00

Investment Returns

Cash on Cash Return: 0.00%
Cap Rate: 0.00%
Total Cash Invested: $0.00
*Note: "Total Cash Invested" assumes 3% closing costs in addition to the down payment for the Cash on Cash calculation.

Mastering Rental Property Analysis

Investing in real estate is a powerful way to build wealth, but simply buying a property and renting it out doesn't guarantee a profit. Successful investors rely on rigorous mathematical analysis to ensure a property will generate positive cash flow. This Rental Property Cash Flow Calculator helps you break down the income, expenses, and debt service associated with a potential investment.

Key Metrics Explained

1. Net Operating Income (NOI)

NOI is one of the most important figures in real estate. It represents the profitability of a property before adding in any costs from financing or taxes. It is calculated as:

NOI = (Total Rental Income – Vacancy Losses) – Operating Expenses

Operating expenses include property taxes, insurance, management fees, maintenance, and HOA fees, but exclude mortgage payments.

2. Cash Flow

This is the money left in your pocket every month after all expenses and mortgage payments are made. Positive cash flow allows you to weather vacancies and repairs without dipping into your personal savings.

Cash Flow = NOI – Debt Service (Mortgage Payment)

3. Cash on Cash Return (CoC)

While Cash Flow tells you how much money you make, Cash on Cash Return tells you how hard your money is working. It expresses your annual cash flow as a percentage of the total cash you actually invested (Down Payment + Closing Costs + Rehab Costs).

Generally, investors look for a CoC return between 8% and 12%, though this varies by market strategy.

Common Expenses to Watch Out For

  • Vacancy Rate: No property is occupied 100% of the time. We recommend estimating 5% to 8% for vacancy.
  • Maintenance & CapEx: Even newly renovated homes need repairs. Setting aside 5-10% of rent for routine maintenance and another 5-10% for Capital Expenditures (big items like roofs or HVAC) is prudent.
  • Property Management: If you hire a professional manager, expect to pay 8-10% of the monthly rent.

How to Use This Calculator

Enter your purchase details, financing terms, and estimated rental income. Be honest with your expense estimates. It is always better to overestimate expenses and underestimate income to ensure your investment is safe. If the numbers turn green (positive cash flow), you may have found a great deal!

function calculateRental() { // 1. Get Input Values var purchasePrice = parseFloat(document.getElementById('purchasePrice').value); var downPaymentPerc = parseFloat(document.getElementById('downPaymentPerc').value); var interestRate = parseFloat(document.getElementById('interestRate').value); var loanTerm = parseFloat(document.getElementById('loanTerm').value); var monthlyRent = parseFloat(document.getElementById('monthlyRent').value); var vacancyRate = parseFloat(document.getElementById('vacancyRate').value); var annualTax = parseFloat(document.getElementById('propertyTax').value); var annualInsurance = parseFloat(document.getElementById('insurance').value); var hoaFees = parseFloat(document.getElementById('hoaFees').value); var repairsPerc = parseFloat(document.getElementById('repairsPerc').value); var capexPerc = parseFloat(document.getElementById('capexPerc').value); var managementPerc = parseFloat(document.getElementById('managementPerc').value); // Validation to prevent NaN errors if (isNaN(purchasePrice) || isNaN(monthlyRent)) { alert("Please enter valid numbers for Price and Rent."); return; } // 2. Calculate Mortgage var downPayment = purchasePrice * (downPaymentPerc / 100); var loanAmount = purchasePrice – downPayment; var monthlyRate = (interestRate / 100) / 12; var numPayments = loanTerm * 12; var monthlyMortgage = 0; if (interestRate > 0) { monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numPayments)) / (Math.pow(1 + monthlyRate, numPayments) – 1); } else { monthlyMortgage = loanAmount / numPayments; } // 3. Calculate Income var vacancyLoss = monthlyRent * (vacancyRate / 100); var effectiveIncome = monthlyRent – vacancyLoss; // 4. Calculate Expenses var monthlyTax = annualTax / 12; var monthlyInsurance = annualInsurance / 12; var monthlyRepairs = monthlyRent * (repairsPerc / 100); var monthlyCapex = monthlyRent * (capexPerc / 100); var monthlyManagement = monthlyRent * (managementPerc / 100); var totalMonthlyExpenses = monthlyTax + monthlyInsurance + hoaFees + monthlyRepairs + monthlyCapex + monthlyManagement; // 5. Calculate Metrics var noi = effectiveIncome – totalMonthlyExpenses; // Monthly NOI var cashFlow = noi – monthlyMortgage; var annualCashFlow = cashFlow * 12; var annualNOI = noi * 12; // Estimate Closing Costs at 3% for total investment calculation var closingCosts = purchasePrice * 0.03; var totalInvested = downPayment + closingCosts; var cocReturn = 0; if (totalInvested > 0) { cocReturn = (annualCashFlow / totalInvested) * 100; } var capRate = 0; if (purchasePrice > 0) { capRate = (annualNOI / purchasePrice) * 100; } // 6. Update DOM document.getElementById('resGrossIncome').innerText = "$" + monthlyRent.toFixed(2); document.getElementById('resVacancy').innerText = "-$" + vacancyLoss.toFixed(2); document.getElementById('resExpenses').innerText = "-$" + totalMonthlyExpenses.toFixed(2); document.getElementById('resNOI').innerText = "$" + noi.toFixed(2); document.getElementById('resMortgage').innerText = "-$" + monthlyMortgage.toFixed(2); var cashFlowEl = document.getElementById('resCashFlow'); cashFlowEl.innerText = "$" + cashFlow.toFixed(2); if(cashFlow >= 0) { cashFlowEl.className = "result-value big-result positive"; } else { cashFlowEl.className = "result-value big-result negative"; } var cocEl = document.getElementById('resCoC'); cocEl.innerText = cocReturn.toFixed(2) + "%"; if(cocReturn >= 0) { cocEl.className = "result-value positive"; } else { cocEl.className = "result-value negative"; } document.getElementById('resCapRate').innerText = capRate.toFixed(2) + "%"; document.getElementById('resInvested').innerText = "$" + totalInvested.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); } // Run calculation on load window.onload = calculateRental;

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