How to Calculate Cash Flow on a Rental Property

BiggerPockets Blog
Published: December 12, 2025
Pricing & Profitability

Summary

This article from BiggerPockets discusses how to accurately calculate cash flow for rental properties, a critical metric for investment success. It emphasizes the importance of including all expenses, especially variable ones like vacancy, repairs, and capital expenditures, which are often underestimated by investors. It provides a step-by-step example using the BiggerPockets Rental Property Calculator and highlights the need to factor in potential vacancy to get a realistic picture of profitability.

Key Insights

  • The article emphasizes that 99% of investors calculate cash flow incorrectly, often by excluding certain expenses.
  • A good starting point for calculating vacancy is to use a percentage of the rental income, with a minimum of 5% recommended.
  • Variable expenses such as repairs, maintenance, capital expenditures, turnover, and vacancy costs should be consistently factored into monthly calculations.

Action Items

  • Hosts should calculate all expenses, both fixed and variable, to accurately determine cash flow for each property. This includes setting aside funds for vacancy, repairs, and capital expenditures.
    Effort: low
    Impact: high

Tools & Resources

  • BiggerPockets Rental Property Calculator: The BiggerPockets Rental Property Calculator is mentioned and can be tried for free.(biggerpockets.com/calculator)

Common Mistakes

  • A common mistake is underestimating variable expenses such as vacancy and repairs, which can lead to a misrepresentation of a property's profitability.

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