Calculating Roi on Rental Property

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Rental Property ROI Calculator

Calculate Your Rental Property's Return on Investment

The total price you paid for the property.
The amount paid upfront, not financed.
Total mortgage financed (Purchase Price – Down Payment).
All fees and expenses incurred during the closing process.
Costs for repairs and improvements.
Total rent collected from the property per year.
Includes property taxes, insurance, maintenance, property management fees, HOA, etc.
Total principal and interest paid on the mortgage annually.
Tax rate applied when you sell the property. Enter 0 if not applicable or uncertain.
How long you plan to own the property before selling.

Your Investment Summary

–%
Total Investment Cost
Total Annual Cash Flow
Total Net Profit (Before Tax)
Estimated Sale Proceeds
Estimated Capital Gains Tax
Total Net Profit (After Tax)
ROI Calculation: ROI = [ (Total Net Profit After Tax + Total Annual Cash Flow * Investment Duration – Loan Principal Paid) / Total Investment Cost ] * 100

(Note: This calculator provides a simplified ROI over the investment duration. It considers cash flow and net profit upon sale.)

Annual Cash Flow Projection

Key Financial Metrics Over Time

Year Gross Rent Operating Expenses Mortgage Payment Net Cash Flow Cumulative Cash Flow

What is Rental Property ROI?

Rental Property ROI, or Return on Investment, is a crucial metric for real estate investors. It quantifies the profitability of a rental property relative to its total cost. Essentially, it tells you how much money you're making (or losing) as a percentage of the money you've put into the investment. Understanding your rental property ROI is fundamental to assessing the performance of your real estate portfolio and making informed decisions about future investments. It helps you compare different investment opportunities and determine if a property is meeting your financial goals. A higher ROI generally indicates a more profitable and potentially less risky investment.

This metric is invaluable for both novice and experienced investors. For beginners, it provides a clear benchmark to evaluate potential deals. For seasoned investors, it's a tool for optimizing their existing portfolio, identifying underperforming assets, and strategizing for long-term wealth building. It's often used to compare a real estate investment against other asset classes, such as stocks or bonds, providing a consolidated view of potential returns. Many investors aim for a specific ROI threshold before committing to a purchase, making this calculation a cornerstone of due diligence.

Common Misconceptions About Rental Property ROI

  • ROI is the same as Cap Rate: While related, Capitalization Rate (Cap Rate) focuses solely on the property's income before debt financing, whereas ROI considers the total investment, including financing and sale proceeds, over a period.
  • Ignoring All Expenses: Some might calculate ROI based on gross rent minus only mortgage, neglecting crucial operating expenses like property taxes, insurance, maintenance, and vacancies, leading to an inflated and unrealistic ROI.
  • Focusing Only on Cash Flow: Positive cash flow is important, but it's only one part of the picture. Appreciation and eventual sale profit (or loss) also contribute significantly to the overall ROI, especially over longer holding periods.
  • Forgetting Taxes and Fees: Not accounting for capital gains tax upon sale, property management fees, or other associated costs can drastically reduce the actual ROI realized.

Rental Property ROI Formula and Mathematical Explanation

The calculation of rental property ROI can be approached in several ways, but a comprehensive method considers the total return over the holding period relative to the total investment cost. Here's a common and effective formula:

Comprehensive ROI Formula:

ROI = [ (Total Net Profit After Tax + Total Annual Cash Flow * Investment Duration – Loan Principal Paid) / Total Investment Cost ] * 100

Let's break down the components:

Variable Explanations:

Variable Meaning Unit Typical Range
Purchase Price The initial price paid for the property. Currency ($) $50,000 – $10,000,000+
Down Payment The upfront cash portion of the purchase price. Currency ($) 10% – 50% of Purchase Price
Loan Amount The total amount borrowed via mortgage. (Purchase Price – Down Payment) Currency ($) $0 – Purchase Price
Closing Costs Expenses incurred during the property transfer (e.g., appraisal fees, title insurance, legal fees). Currency ($) 2% – 5% of Purchase Price
Renovation Costs Costs for improvements or necessary repairs. Currency ($) $0 – Significant Investment
Annual Gross Rental Income Total rental income collected per year before any expenses. Currency ($) / Year Varies widely by market and property type
Annual Operating Expenses All costs associated with operating the property (e.g., property taxes, insurance, repairs, maintenance, property management fees, utilities if paid by owner, vacancy allowance). Currency ($) / Year 25% – 50% of Gross Rental Income
Annual Mortgage Payment Total annual payments for principal and interest on the mortgage. Currency ($) / Year Calculated based on loan terms
Capital Gains Tax Rate The tax percentage applied to the profit made from selling the property. % 0% – 20%+ (Federal/State)
Investment Duration The number of years the property is held before being sold. Years 1 – 30+ Years
Total Investment Cost The sum of the down payment, closing costs, and initial renovation costs. This represents your out-of-pocket expenses. Currency ($) Down Payment + Closing Costs + Renovation Costs
Total Annual Cash Flow Annual Gross Rental Income minus Annual Operating Expenses and Annual Mortgage Payment. Currency ($) / Year Annual Rent – Annual OpEx – Annual Mortgage P&I
Loan Principal Paid The total amount of principal paid down over the investment duration. This is a portion of the total mortgage payments. Currency ($) Calculated based on amortization schedule
Estimated Sale Proceeds The hypothetical sale price after the investment duration, assuming appreciation. For simplicity in this calculator, we're focusing on the return over the period rather than a future sale appreciation model. The profit component is more directly tied to cash flow and principal paydown for a holding period ROI. For a total return, you would factor in the net sale price minus remaining mortgage balance and selling costs. Currency ($) (Sale Price – Selling Costs – Remaining Mortgage Balance)
Estimated Capital Gains Tax Tax payable on the profit from selling the property. Currency ($) (Sale Price – Adjusted Cost Basis – Selling Costs) * Capital Gains Tax Rate
Total Net Profit After Tax Total cash flow generated over the holding period, minus capital gains tax implications from sale profit. For this calculator's simplified ROI, we are primarily focusing on the sum of cash flows and principal paydown as the 'profit' component over the duration. A more complex model would include sale price appreciation and selling costs. Currency ($) (Total Annual Cash Flow * Investment Duration) – Capital Gains Tax

Explanation: The core idea is to find the total gain achieved from the investment and divide it by the initial capital invested. The "gain" includes all the net cash generated year after year (cash flow), plus any principal reduction on the loan, and ideally, the profit from selling the property. The "initial capital" is your total out-of-pocket expense to acquire and prepare the property for rent.

Practical Examples (Real-World Use Cases)

Example 1: A Promising Starter Property

Sarah is looking to purchase her first rental property. She finds a condo in a growing neighborhood.

  • Purchase Price: $250,000
  • Down Payment: $50,000 (20%)
  • Closing Costs: $4,000
  • Renovation Costs: $6,000
  • Annual Gross Rental Income: $24,000 ($2,000/month)
  • Annual Operating Expenses: $7,000 (Taxes, insurance, maintenance, vacancy allowance)
  • Annual Mortgage Payment: $10,000 (P&I)
  • Capital Gains Tax Rate: 15%
  • Investment Duration: 5 Years

Calculator Inputs & Outputs:

  • Total Investment Cost: $50,000 (Down Payment) + $4,000 (Closing Costs) + $6,000 (Renovations) = $60,000
  • Total Annual Cash Flow: $24,000 (Rent) – $7,000 (OpEx) – $10,000 (Mortgage) = $7,000
  • Total Net Profit (Before Tax): $7,000 (Annual Cash Flow) * 5 (Years) = $35,000
  • Loan Principal Paid (over 5 years): Let's assume $15,000
  • Estimated Sale Proceeds (Hypothetical): Not directly calculated in this simplified ROI, but cash flow and principal paydown contribute to return.
  • Estimated Capital Gains Tax: $0 (Assuming no appreciation for simplified cash-on-cash calculation focus)
  • Total Net Profit (After Tax): $35,000
  • Calculated ROI: [ ($35,000 + $7,000 * 5 – $15,000) / $60,000 ] * 100 = [ ($35,000 + $35,000 – $15,000) / $60,000 ] * 100 = ($55,000 / $60,000) * 100 ≈ 91.7% (over 5 years)

Interpretation: Sarah's investment is projected to yield a total return of approximately 91.7% over five years, significantly driven by consistent positive cash flow and principal reduction. This is a strong indicator for a first-time rental property investment.

Example 2: A High-Leverage, Value-Add Opportunity

Mark sees potential in a fixer-upper duplex. He plans to renovate and rent both units.

  • Purchase Price: $400,000
  • Down Payment: $80,000 (20%)
  • Closing Costs: $6,000
  • Renovation Costs: $30,000
  • Annual Gross Rental Income: $48,000 ($4,000/month total)
  • Annual Operating Expenses: $12,000
  • Annual Mortgage Payment: $16,000 (P&I)
  • Capital Gains Tax Rate: 15%
  • Investment Duration: 7 Years

Calculator Inputs & Outputs:

  • Total Investment Cost: $80,000 (Down Payment) + $6,000 (Closing Costs) + $30,000 (Renovations) = $116,000
  • Total Annual Cash Flow: $48,000 (Rent) – $12,000 (OpEx) – $16,000 (Mortgage) = $20,000
  • Total Net Profit (Before Tax): $20,000 (Annual Cash Flow) * 7 (Years) = $140,000
  • Loan Principal Paid (over 7 years): Let's assume $25,000
  • Estimated Sale Proceeds: N/A for simplified period ROI
  • Estimated Capital Gains Tax: $0 (Assuming no appreciation for simplified model)
  • Total Net Profit (After Tax): $140,000
  • Calculated ROI: [ ($140,000 + $20,000 * 7 – $25,000) / $116,000 ] * 100 = [ ($140,000 + $140,000 – $25,000) / $116,000 ] * 100 = ($255,000 / $116,000) * 100 ≈ 219.8% (over 7 years)

Interpretation: Mark's calculated ROI of nearly 220% over seven years is very attractive. This high return is driven by substantial positive cash flow and significant principal paydown, demonstrating the power of a value-add strategy combined with calculated leverage. This suggests the property could be a strong performer in his portfolio.

How to Use This Rental Property ROI Calculator

Using our Rental Property ROI Calculator is straightforward and designed to give you quick, actionable insights into your potential investment's profitability. Follow these simple steps:

Step-by-Step Guide:

  1. Enter Purchase Details: Input the 'Purchase Price' of the property and the 'Down Payment' you intend to make. The 'Loan Amount' will calculate automatically.
  2. Input Acquisition Costs: Add your estimated 'Closing Costs' and any 'Renovation Costs' required to get the property ready for tenants.
  3. Define Income: Enter the 'Annual Gross Rental Income' you expect to receive. This should be based on realistic market rents.
  4. Estimate Expenses: Input your 'Annual Operating Expenses'. This is a critical step and should include property taxes, insurance, maintenance, repairs, property management fees, and an allowance for vacancies.
  5. Add Mortgage Payment: Enter the 'Annual Mortgage Payment' (principal and interest combined).
  6. Specify Tax and Duration: Input your estimated 'Capital Gains Tax Rate' (if applicable upon sale) and the 'Investment Duration' in years you plan to hold the property.
  7. Calculate: Click the 'Calculate ROI' button.

Reading Your Results:

  • Primary Result (ROI %): This is your main indicator. It shows the total percentage return on your investment over the specified duration. A higher percentage is generally better.
  • Total Investment Cost: Your total out-of-pocket expenses to acquire and prepare the property.
  • Total Annual Cash Flow: The net income generated by the property each year after all expenses and mortgage payments. Positive cash flow is essential for sustainability.
  • Total Net Profit (Before/After Tax): The cumulative profit generated from cash flow and loan principal paydown over your holding period.
  • Table & Chart: Review the 'Financial Metrics Over Time' table for a year-by-year breakdown of cash flow. The 'Annual Cash Flow Projection' chart visually represents this performance.

Decision-Making Guidance:

Use the calculated ROI to compare potential investments. A higher ROI suggests a more efficient use of your capital. Consider your personal investment goals: Are you seeking high passive income (cash flow), long-term appreciation, or a balance of both? The ROI helps you align property performance with these objectives. Remember that this calculator provides an estimate; real-world results can vary due to unforeseen expenses, market fluctuations, and tenant issues. Always perform thorough due diligence, including a detailed analysis of comparable rental rates and a professional property inspection.

Key Factors That Affect Rental Property ROI Results

Several critical factors can significantly influence the calculated ROI of your rental property. Understanding these variables is key to accurate forecasting and maximizing your investment's success:

  1. Market Rents and Vacancy Rates: The income generated is directly tied to how much rent you can charge and how often the property is occupied. Overestimating rents or underestimating vacancy periods leads to inflated ROI projections. Consistent market research is vital.
  2. Operating Expenses Management: Property taxes, insurance premiums, maintenance costs, and property management fees are ongoing. Proactively managing these expenses—by shopping for insurance, performing preventative maintenance, and negotiating with contractors—can improve your net cash flow and thus your ROI.
  3. Financing Terms (Loan Interest Rate & Term): The interest rate on your mortgage significantly impacts your annual mortgage payment and the total interest paid over time. A lower interest rate reduces expenses, increases cash flow, and boosts ROI. The loan term also affects monthly payments and principal paydown speed.
  4. Property Appreciation and Depreciation: While this calculator focuses on income and cash flow over a holding period, the property's market value can increase (appreciation) or decrease (depreciation). Long-term ROI is often boosted by appreciation, but it's speculative and not guaranteed.
  5. Capital Expenditures (CapEx): Major repairs or replacements (e.g., new roof, HVAC system) are distinct from routine operating expenses. While not always included in standard operating expense calculations, they are crucial costs that impact overall profitability and should be factored into long-term projections or capitalized into the property's basis.
  6. Tax Implications: Beyond capital gains tax upon sale, consider property taxes, potential deductions for operating expenses (like mortgage interest, repairs, property management fees), and depreciation allowances. Understanding tax laws can legally minimize your tax burden and enhance your net returns.
  7. Inflation and Economic Conditions: Inflation can erode the purchasing power of your rental income and increase operating costs. Economic downturns might lead to higher vacancies or pressure on rent prices. Monitoring macroeconomic trends is important for long-term planning.

Frequently Asked Questions (FAQ)

Q1: What is a good ROI for a rental property?

A: A "good" ROI varies by market, risk tolerance, and investment strategy. Generally, investors aim for an annual ROI of 5-10% or higher. However, many successful investors focus on total ROI over their entire holding period, which can be significantly higher, especially when factoring in appreciation and principal paydown.

Q2: How is ROI different from Cash-on-Cash Return?

A: Cash-on-Cash Return specifically measures the annual return on the actual cash invested (down payment, closing costs, renovation costs). ROI, as calculated here, considers the total investment cost and can project returns over a specific holding period, including principal paydown and profit from sale (if modeled). Cash-on-Cash is a snapshot of annual performance based on cash invested, while ROI can be a total return metric.

Q3: Should I include the mortgage principal payment in my ROI calculation?

A: Yes, for a total return calculation over a holding period, the principal paid down on the mortgage represents a form of return on your investment – you are reducing debt and increasing your equity. This calculator includes it in the total profit calculation.

Q4: How do I estimate 'Annual Operating Expenses' accurately?

A: Research local property tax rates, get insurance quotes, budget for regular maintenance (e.g., 1% of property value annually), factor in potential repairs, and include property management fees (typically 8-12% of gross rent). Also, allocate a percentage for vacancy (e.g., 5-10% of gross rent).

Q5: What if the property value increases significantly? How does that affect ROI?

A: Property appreciation increases your total return upon sale. While this calculator focuses on a holding period ROI that emphasizes cash flow and principal paydown, a significant increase in market value would boost the overall profitability when you eventually sell. A more complex ROI calculation would factor in the net proceeds from the sale.

Q6: Can I use this calculator for commercial properties?

A: While the core principles of ROI apply, commercial properties often have different expense structures, lease terms (e.g., NNN leases), and valuation methods. This calculator is primarily designed for residential rental properties. You would need to adjust expense categories and income assumptions for commercial use.

Q7: What is the impact of selling costs on ROI?

A: Selling costs (realtor commissions, closing costs, potential capital gains taxes) reduce your net profit from the sale. When calculating the total ROI including a sale, these costs must be subtracted from the sale price to determine the net proceeds, thereby lowering the overall ROI.

Q8: Does this calculator account for inflation?

A: This calculator does not explicitly model inflation's impact on future rental income or expenses. However, you can account for it by adjusting your projected annual rent increases and expense growth rates when inputting your figures, or by performing calculations for different economic scenarios.

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errors = true; } if (!isValidNumber(annualOperatingExpenses) || annualOperatingExpenses annualRentIncome) { document.getElementById("annualOperatingExpensesError").textContent = "Operating expenses cannot exceed rental income."; errors = true; } if (!isValidNumber(annualMortgagePayment) || annualMortgagePayment < 0) { document.getElementById("annualMortgagePaymentError").textContent = "Please enter a valid non-negative number for Annual Mortgage Payment."; errors = true; } if (!isValidNumber(capitalGainsTaxRate) || capitalGainsTaxRate 100) { document.getElementById("capitalGainsTaxRateError").textContent = "Please enter a valid percentage between 0 and 100."; errors = true; } if (!isValidNumber(investmentDuration) || investmentDuration 0) { // A very rough estimate: assume a fraction of the total payments goes to principal. // More accurate would be using loan amortization formulas. // For simplicity, let's distribute principal paydown. // A better approach involves iterative calculation or lookup tables. // Let's use a simplified formula for principal reduction based on typical mortgage structures // This is still an approximation! var annualInterestRateApprox = 0.05; // Assuming 5% interest rate for approximation var monthlyInterestRate = annualInterestRateApprox / 12; var loanTermMonths = 30 * 12; // Assuming 30-year loan term for calculation basis if(loanAmount > 0 && annualMortgagePayment > 0) { // Calculate monthly P&I payment based on loanAmount, assumed rate, and term var monthlyPaymentCalc = loanAmount * (monthlyInterestRate * Math.pow(1 + monthlyInterestRate, loanTermMonths)) / (Math.pow(1 + monthlyInterestRate, loanTermMonths) – 1); var totalInterestPaidOverTerm = (monthlyPaymentCalc * loanTermMonths) – loanAmount; // Estimate principal paid over the investment duration var principalPaidInRange = 0; var currentBalance = loanAmount; for (var year = 0; year < investmentDuration; year++) { var principalThisYear = 0; var interestThisYear = 0; for (var month = 0; month < 12; month++) { var interestForMonth = currentBalance * monthlyInterestRate; var principalForMonth = monthlyPaymentCalc – interestForMonth; currentBalance -= principalForMonth; principalThisYear += principalForMonth; interestThisYear += interestForMonth; if (currentBalance <= 0) { // Loan paid off early principalThisYear = loanAmount – (loanAmount – principalPaidInRange); // Adjust principal for payoff break; } } principalPaidInRange += principalThisYear; if (currentBalance 0) { roi = (totalNetProfitAfterTax / totalInvestmentCost) * 100; } // For the projected sale value: // This calculator doesn't model future sale price appreciation. // Estimated Sale Proceeds are not directly calculable without an appreciation model. // We'll leave this as placeholder or based on initial cost basis for simplicity. var estimatedSaleProceeds = "–"; // Not modeled // Update results display updateResults(formatPercent(roi), formatCurrency(totalInvestmentCost), formatCurrency(annualCashFlow), formatCurrency(totalNetProfitPreTax), estimatedSaleProceeds, formatCurrency(estimatedCapitalGainsTax), formatCurrency(totalNetProfitAfterTax) ); // Update chart and table updateChartAndTable(investmentDuration, annualRentIncome, annualOperatingExpenses, annualMortgagePayment, annualCashFlow); } function updateResults(roi, totalInvestmentCost, totalAnnualCashFlow, totalNetProfitPreTax, estimatedSaleProceeds, estimatedCapitalGainsTax, totalNetProfitAfterTax) { document.getElementById("primaryResult").textContent = roi; document.getElementById("totalInvestmentCost").textContent = totalInvestmentCost; document.getElementById("totalAnnualCashFlow").textContent = totalAnnualCashFlow; document.getElementById("totalNetProfitPreTax").textContent = totalNetProfitPreTax; document.getElementById("estimatedSaleProceeds").textContent = estimatedSaleProceeds; document.getElementById("estimatedCapitalGainsTax").textContent = estimatedCapitalGainsTax; document.getElementById("totalNetProfitAfterTax").textContent = totalNetProfitAfterTax; } function clearErrors() { var errorElements = document.getElementsByClassName("error-message"); for (var i = 0; i < errorElements.length; i++) { errorElements[i].textContent = ""; } } function resetForm() { document.getElementById("purchasePrice").value = ""; document.getElementById("downPayment").value = ""; document.getElementById("closingCosts").value = ""; document.getElementById("renovationCosts").value = ""; document.getElementById("annualRentIncome").value = ""; document.getElementById("annualOperatingExpenses").value = ""; document.getElementById("annualMortgagePayment").value = ""; document.getElementById("capitalGainsTaxRate").value = "0"; document.getElementById("investmentDuration").value = "5"; document.getElementById("loanAmount").value = ""; // Clear calculated value updateResults('–', '–', '–', '–', '–', '–', '–'); if (chart) { chart.destroy(); chart = null; } // Clear table body var tableBody = document.querySelector("#financialMetricsTable tbody"); tableBody.innerHTML = ""; clearErrors(); } function copyResults() { var primaryResult = document.getElementById("primaryResult").textContent; var totalInvestmentCost = document.getElementById("totalInvestmentCost").textContent; var totalAnnualCashFlow = document.getElementById("totalAnnualCashFlow").textContent; var totalNetProfitPreTax = document.getElementById("totalNetProfitPreTax").textContent; var estimatedSaleProceeds = document.getElementById("estimatedSaleProceeds").textContent; var estimatedCapitalGainsTax = document.getElementById("estimatedCapitalGainsTax").textContent; var totalNetProfitAfterTax = document.getElementById("totalNetProfitAfterTax").textContent; var purchasePrice = document.getElementById("purchasePrice").value; var downPayment = document.getElementById("downPayment").value; var closingCosts = document.getElementById("closingCosts").value; var renovationCosts = document.getElementById("renovationCosts").value; var annualRentIncome = document.getElementById("annualRentIncome").value; var annualOperatingExpenses = document.getElementById("annualOperatingExpenses").value; var annualMortgagePayment = document.getElementById("annualMortgagePayment").value; var capitalGainsTaxRate = document.getElementById("capitalGainsTaxRate").value; var investmentDuration = document.getElementById("investmentDuration").value; var copyText = "— Rental Property ROI Calculation Results —\n\n"; copyText += "Key Inputs:\n"; copyText += "Purchase Price: " + purchasePrice + "\n"; copyText += "Down Payment: " + downPayment + "\n"; copyText += "Closing Costs: " + closingCosts + "\n"; copyText += "Renovation Costs: " + renovationCosts + "\n"; copyText += "Annual Gross Rental Income: " + annualRentIncome + "\n"; copyText += "Annual Operating Expenses: " + annualOperatingExpenses + "\n"; copyText += "Annual Mortgage Payment: " + annualMortgagePayment + "\n"; copyText += "Capital Gains Tax Rate: " + capitalGainsTaxRate + "%\n"; copyText += "Investment Duration: " + investmentDuration + " years\n\n"; copyText += "Summary:\n"; copyText += "ROI: " + primaryResult + "\n"; copyText += "Total Investment Cost: " + totalInvestmentCost + "\n"; copyText += "Total Annual Cash Flow: " + totalAnnualCashFlow + "\n"; copyText += "Total Net Profit (Before Tax): " + totalNetProfitPreTax + "\n"; copyText += "Estimated Sale Proceeds: " + estimatedSaleProceeds + "\n"; copyText += "Estimated Capital Gains Tax: " + estimatedCapitalGainsTax + "\n"; copyText += "Total Net Profit (After Tax): " + totalNetProfitAfterTax + "\n"; navigator.clipboard.writeText(copyText).then(function() { // Optional: Provide feedback to the user var originalText = document.querySelector('.btn-success').textContent; document.querySelector('.btn-success').textContent = 'Copied!'; setTimeout(function() { document.querySelector('.btn-success').textContent = originalText; }, 1500); }, function(err) { console.error('Could not copy text: ', err); // Optional: Provide feedback to the user var originalText = document.querySelector('.btn-success').textContent; document.querySelector('.btn-success').textContent = 'Copy Failed!'; setTimeout(function() { document.querySelector('.btn-success').textContent = originalText; }, 1500); }); } function updateChartAndTable(duration, annualRentIncome, annualOperatingExpenses, annualMortgagePayment, annualCashFlow) { var ctx = document.getElementById('cashFlowChart').getContext('2d'); // Destroy previous chart if it exists if (chart) { chart.destroy(); } var labels = []; var netCashFlowData = []; var cumulativeCashFlowData = []; var cumulativeCashFlow = 0; var tableBody = document.querySelector("#financialMetricsTable tbody"); tableBody.innerHTML = ""; // Clear previous table rows for (var i = 1; i <= duration; i++) { labels.push("Year " + i); // Recalculate annual cash flow for this specific year if needed (e.g. if income/expenses change yearly) // For this calculator, we assume constant annual figures for simplicity var currentYearCashFlow = annualCashFlow; netCashFlowData.push(currentYearCashFlow); cumulativeCashFlow += currentYearCashFlow; cumulativeCashFlowData.push(cumulativeCashFlow); // Populate table row var row = tableBody.insertRow(); row.insertCell(0).textContent = i; row.insertCell(1).textContent = formatCurrency(annualRentIncome); row.insertCell(2).textContent = formatCurrency(annualOperatingExpenses); row.insertCell(3).textContent = formatCurrency(annualMortgagePayment); row.insertCell(4).textContent = formatCurrency(currentYearCashFlow); row.insertCell(5).textContent = formatCurrency(cumulativeCashFlow); } chart = new Chart(ctx, { type: 'bar', // Changed to bar for clearer year-over-year visualization data: { labels: labels, datasets: [{ label: 'Annual Net Cash Flow', data: netCashFlowData, backgroundColor: 'rgba(0, 74, 153, 0.6)', // Primary color borderColor: 'rgba(0, 74, 153, 1)', borderWidth: 1, yAxisID: 'y-cashflow' }, { label: 'Cumulative Cash Flow', data: cumulativeCashFlowData, type: 'line', // Line chart for cumulative borderColor: 'rgba(40, 167, 69, 1)', // Success color backgroundColor: 'rgba(40, 167, 69, 0.2)', fill: false, yAxisID: 'y-cumulative' }] }, options: { scales: { x: { title: { display: true, text: 'Investment Period' } }, y: { // Default y-axis, potentially for Cash Flow beginAtZero: true, title: { display: true, text: 'Amount ($)' }, position: 'left', id: 'y-cashflow' }, y1: { // Second y-axis for cumulative cash flow beginAtZero: true, title: { display: true, text: 'Cumulative Amount ($)' }, position: 'right', id: 'y-cumulative', grid: { drawOnChartArea: false, // only want the grid lines for primary y axis. } } }, plugins: { tooltip: { mode: 'index', intersect: false }, legend: { labels: { // Generate labels dynamically based on datasets generateLabels: function(chart) { var originalLabels = Chart.defaults.plugins.legend.labels.generateLabels(chart); var datasets = chart.data.datasets; var visibleDatasets = datasets.filter(function(d) { return d.label; }); // Only consider datasets with labels var generated = []; visibleDatasets.forEach(function(dataset, i) { generated.push({ text: dataset.label, fillStyle: dataset.backgroundColor, strokeStyle: dataset.borderColor, lineWidth: dataset.borderWidth, hidden: !chart.isDatasetVisible(i), datasetIndex: i }); }); return generated; } } } }, responsive: true, maintainAspectRatio: false } }); } // Initial calculation on page load to populate default values if any document.addEventListener('DOMContentLoaded', function() { // Set default values that make sense for demonstration document.getElementById("purchasePrice").value = "300000"; document.getElementById("downPayment").value = "60000"; // 20% document.getElementById("closingCosts").value = "5000"; document.getElementById("renovationCosts").value = "10000"; document.getElementById("annualRentIncome").value = "36000"; // $3000/month document.getElementById("annualOperatingExpenses").value = "9000"; // Approx 25% document.getElementById("annualMortgagePayment").value = "12000"; // Example P&I document.getElementById("capitalGainsTaxRate").value = "15"; document.getElementById("investmentDuration").value = "5"; calculateROI(); // Perform initial calculation });

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