7 “Golden Rules” That Will Make You Richer with Rentals

BiggerPockets Blog
Published: September 24, 2025
Pricing & Profitability

Summary

This article discusses seven "golden rules" of real estate investing, with a focus on budgeting for full payments, accounting for all expenses, and having a clear investment strategy. Hosts should focus on cash flow and use tools to model expenses to improve profitability and avoid common financial mistakes.

Key Insights

  • It's crucial to factor in all expenses beyond the mortgage payment, including bookkeeping, tax preparation, reserves, utilities, vacancy costs, and capital expenditures (CapEx) like roof and HVAC replacements, to accurately calculate net profit.
  • Rookie investors often underestimate expenses, focusing only on principal and interest, but failing to include property taxes, insurance, and HOA fees, leading to inaccurate profit calculations.

Action Items

  • Use pre-built tools and calculators from sources like BiggerPockets to accurately model all expenses associated with property ownership to prevent underestimation of costs.
    Effort: low
    Impact: medium
  • When rehabbing, create a detailed scope of work, including pictures of comparable properties, to identify all potential costs and avoid underbudgeting; add a 20% contingency to your budget.
    Effort: medium
    Impact: high
  • Focus on cash flow and align investment decisions with your financial goals, prioritizing properties that meet your profitability targets over those that are aesthetically pleasing.
    Effort: low
    Impact: high

Tools & Resources

  • BiggerPockets Tools: BiggerPockets.com/tools offers calculators for different investing strategies.(biggerpockets.com/tools)

Common Mistakes

  • New investors often underestimate expenses, leading to inaccurate profit projections and potential financial difficulties.
  • Rookie investors get caught up in how 'cute' a property is rather than its financial potential (cash flow).

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