Tiny Toolkit

Rental Cash Flow Calculator — Rental Property Profit Analysis

Calculate the monthly and annual cash flow of a rental property by entering all income and expense line items. Income includes rent and any ancillary fees; expenses cover mortgage, taxes, insurance, management, maintenance, vacancy, and CapEx reserves. The result shows gross operating income, net operating income, and final cash flow after debt service — the key figures any investor needs before making an offer.

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Frequently Asked Questions

What is cash flow in real estate?
Cash flow is the money left over each month after collecting rent and paying all expenses — mortgage, taxes, insurance, management fees, maintenance reserves, vacancy allowance, and any other costs. Positive cash flow means the property puts money in your pocket; negative means you're subsidising it out of pocket each month.
What vacancy rate should I use?
A 5–8% vacancy rate (roughly 0.6–1 month per year) is a common default for stable residential markets. In high-turnover or seasonal markets, use 10% or higher. Even if your property is currently fully occupied, always model a vacancy rate — it's a cost of ownership, not an exception.
What should I budget for maintenance and CapEx?
Most experienced landlords set aside 5–10% of rent for routine maintenance and another 5–10% for capital expenditure reserves (roof, HVAC, appliances, etc.). A newer property may need less; an older one significantly more. Skipping the CapEx reserve is the most common mistake new landlords make.
What is the difference between NOI and cash flow?
Net operating income (NOI) is revenue minus operating expenses, but before debt service. Cash flow subtracts the mortgage payment from NOI. NOI is used for property valuation and cap rate calculations; cash flow tells you the actual return on your equity investment.

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Calculate the new monthly rent after a percentage or flat dollar increase, and see the annualized income change. Useful for landlords and property managers. Free.

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