Please enter valid positive numbers for all fields.
Monthly Financial Analysis
Gross Monthly Income:
Principal & Interest (Mortgage):
Operating Expenses (Tax, Ins, Maint, etc.):
Vacancy Loss:
Property Management:
Net Monthly Cash Flow:
Annual Returns
Annual Cash Flow:
Total Cash Invested:
Cash on Cash Return (ROI):
Understanding Rental Property Cash Flow
Investing in real estate is a powerful way to build wealth, but the success of a rental property hinges on its numbers. Cash flow is the net amount of money moving into or out of a business, project, or financial product. For a rental property, it is calculated by subtracting all operating expenses and debt service payments from the gross rental income.
Positive cash flow means the property generates more income than it costs to own and operate, providing you with passive income. Negative cash flow means you are losing money every month to keep the property, which is generally sustainable only if you are banking on significant appreciation.
How This Calculator Works
Our Rental Property Cash Flow Calculator provides a detailed analysis of your potential investment by breaking down the finances into three core categories:
Income: The monthly rent you collect. We also account for vacancy rates, as properties are rarely occupied 100% of the time.
Operating Expenses: The costs to run the property, including property taxes, insurance, maintenance, HOA fees, and property management fees.
Debt Service: The monthly principal and interest payments on your mortgage loan.
Key Metrics Explained
When analyzing a deal, experienced investors look beyond just the monthly rent check. Here are the critical metrics this calculator provides:
Net Monthly Cash Flow
This is your "take-home" profit each month. It is the money remaining after the mortgage and all bills are paid. Formula: Gross Rent – Vacancy Loss – Operating Expenses – Mortgage Payment.
Cash on Cash Return (ROI)
Cash on Cash Return measures the annual return on the actual cash you invested, rather than the total loan amount. It is one of the most important metrics for rental investors because it compares the performance of your money against other potential investments (like the stock market).
Formula: (Annual Net Cash Flow / Total Cash Invested) x 100. Total cash invested typically includes your down payment and closing costs.
What is a Good Cash on Cash Return?
While targets vary by investor and market strategy, a Cash on Cash return of 8% to 12% is often considered solid for a long-term rental. In highly competitive markets, investors might accept lower returns (4-6%) in exchange for higher expected property appreciation, while investors in riskier markets may demand 15% or higher.
function calculateRentalCashFlow() {
// Get Inputs
var purchasePrice = parseFloat(document.getElementById('purchasePrice').value);
var downPayment = parseFloat(document.getElementById('downPayment').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 vacancyRate = parseFloat(document.getElementById('vacancyRate').value);
var propertyTax = parseFloat(document.getElementById('propertyTax').value);
var insurance = parseFloat(document.getElementById('insurance').value);
var maintenance = parseFloat(document.getElementById('maintenance').value);
var mgmtFee = parseFloat(document.getElementById('mgmtFee').value);
var hoa = parseFloat(document.getElementById('hoa').value);
// Validation
if (isNaN(purchasePrice) || isNaN(downPayment) || isNaN(interestRate) ||
isNaN(loanTerm) || isNaN(monthlyRent) || isNaN(propertyTax) ||
isNaN(insurance) || isNaN(maintenance)) {
document.getElementById('rpError').style.display = 'block';
document.getElementById('rpResults').style.display = 'none';
return;
} else {
document.getElementById('rpError').style.display = 'none';
}
// Mortgage Calculation
var loanAmount = purchasePrice – downPayment;
var monthlyInterestRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
var mortgagePayment = 0;
if (interestRate === 0) {
mortgagePayment = loanAmount / numberOfPayments;
} else {
mortgagePayment = (loanAmount * monthlyInterestRate) * (Math.pow(1 + monthlyInterestRate, numberOfPayments)) / (Math.pow(1 + monthlyInterestRate, numberOfPayments) – 1);
}
// Monthly Calculations
var monthlyVacancyCost = monthlyRent * (vacancyRate / 100);
var monthlyMgmtCost = monthlyRent * (mgmtFee / 100);
var monthlyTax = propertyTax / 12;
var monthlyInsurance = insurance / 12;
var totalMonthlyExpenses = mortgagePayment + monthlyVacancyCost + monthlyMgmtCost + monthlyTax + monthlyInsurance + maintenance + hoa;
var operatingExpensesOnly = monthlyTax + monthlyInsurance + maintenance + hoa; // Excluding Debt/Vacancy/Mgmt for display logic or grouping? Let's group Ops + Vacancy + Mgmt for display.
var displayOpsExpenses = monthlyTax + monthlyInsurance + maintenance + hoa; // Tax, Ins, Maint, HOA
var monthlyCashFlow = monthlyRent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
var totalInvested = downPayment + closingCosts;
var cashOnCashReturn = (annualCashFlow / totalInvested) * 100;
// Display Results
var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' });
document.getElementById('resGrossIncome').innerHTML = formatter.format(monthlyRent);
document.getElementById('resMortgage').innerHTML = formatter.format(mortgagePayment);
document.getElementById('resOpsExpenses').innerHTML = formatter.format(displayOpsExpenses);
document.getElementById('resVacancy').innerHTML = formatter.format(monthlyVacancyCost);
document.getElementById('resMgmt').innerHTML = formatter.format(monthlyMgmtCost);
var cashFlowEl = document.getElementById('resCashFlow');
cashFlowEl.innerHTML = formatter.format(monthlyCashFlow);
cashFlowEl.style.color = monthlyCashFlow >= 0 ? '#2c7744' : '#d32f2f';
var annualFlowEl = document.getElementById('resAnnualCashFlow');
annualFlowEl.innerHTML = formatter.format(annualCashFlow);
annualFlowEl.style.color = annualCashFlow >= 0 ? '#2c7744' : '#d32f2f';
document.getElementById('resTotalInvested').innerHTML = formatter.format(totalInvested);
var roiEl = document.getElementById('resROI');
roiEl.innerHTML = cashOnCashReturn.toFixed(2) + "%";
roiEl.style.color = cashOnCashReturn >= 0 ? '#2c7744' : '#d32f2f';
document.getElementById('rpResults').style.display = 'block';
}