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Rental Property Cash Flow Calculator

Analyze the potential profitability of an investment property.

1. Purchase & Loan

2. Income & Expenses (Monthly)

Please fill in all fields with valid numeric values.

Cash Flow Analysis Results

Effective Monthly Rent (after vacancy): $0.00
Monthly Principal & Interest (P&I): $0.00
Total Monthly Operating Expenses: $0.00
Net Monthly Cash Flow: $0.00
Net Annual Cash Flow: $0.00
function calculateCashFlow() { // 1. Retrieve Inputs var price = parseFloat(document.getElementById('rpcf_price').value); var downPercent = parseFloat(document.getElementById('rpcf_down_percent').value); var ratePercent = parseFloat(document.getElementById('rpcf_rate').value); var termYears = parseFloat(document.getElementById('rpcf_term').value); var grossRent = parseFloat(document.getElementById('rpcf_rent').value); var vacancyPercent = parseFloat(document.getElementById('rpcf_vacancy').value); var tax = parseFloat(document.getElementById('rpcf_tax').value); var ins = parseFloat(document.getElementById('rpcf_ins').value); var maint = parseFloat(document.getElementById('rpcf_maint').value); var errorBox = document.getElementById('rpcf_error_box'); var resultsBox = document.getElementById('rpcf_results_box'); // 2. Validation if (isNaN(price) || isNaN(downPercent) || isNaN(ratePercent) || isNaN(termYears) || isNaN(grossRent) || isNaN(vacancyPercent) || isNaN(tax) || isNaN(ins) || isNaN(maint) || termYears = 0) { monthlyCFSpan.style.color = '#28a745'; annualCFSpan.style.color = '#28a745'; } else { monthlyCFSpan.style.color = '#d9534f'; annualCFSpan.style.color = '#d9534f'; } }

Understanding Rental Property Cash Flow

Cash flow is the lifeblood of any rental property investment. It represents the net amount of cash currently moving into and out of your investment business. For real estate investors, calculating cash flow accurately before purchasing a property is crucial to determine if the investment will yield a profit after all expenses and debt obligations are met.

A property with positive cash flow means the rental income exceeds all expenses, providing you with passive income. A property with negative cash flow costs you money out-of-pocket every month to sustain. While some investors accept negative cash flow in hopes of high future appreciation, most seek positive cash flow for sustainable investing.

How This Calculator Works

This Rental Property Cash Flow Calculator breaks down the math into two main categories: the costs associated with acquiring the property and the ongoing monthly income versus expenses.

  • Gross Income vs. Effective Income: While you might charge $2,000 a month in rent, you likely won't collect that every single month due to tenant turnover. This calculator subtracts a "Vacancy Rate" to give you a realistic "Effective Monthly Rent."
  • Debt Service (P&I): Based on your purchase price, down payment, interest rate, and loan term, the calculator computes your monthly Principal and Interest payment.
  • Operating Expenses: These are the recurring costs of owning the property, including property taxes, insurance, and maintenance reserves.

Example Scenario

Let's assume you are looking at a single-family home listed for $350,000. You plan to put 20% down and secure a 30-year mortgage at a 6.5% interest rate.

You estimate the property can rent for $2,600 per month. You anticipate a 5% vacancy rate over the long term. Your estimated monthly expenses are $400 for taxes, $150 for insurance, and you budget $250 for maintenance and repairs.

Using the calculator above with these figures:

  • Your loan amount would be $280,000, resulting in a monthly P&I payment of approximately $1,769.80.
  • Your effective rental income (after the 5% vacancy loss) would be $2,470.00.
  • Your total operating expenses (taxes, insurance, maintenance) are $800.00.

The Result: Your total monthly outflow ($1,769.80 + $800.00) is $2,569.80. When subtracted from your effective income of $2,470.00, the property would have a Net Monthly Cash Flow of -$99.80.

In this scenario, despite a high rent, the property cash flows negatively due to the current interest rates and expenses. An investor would need to either negotiate a lower purchase price, find a way to increase rent, or decrease expenses to turn this into a positive cash flow investment.

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