Idaho real estate glossary
The 70% Rule vs. The 1% Rule: Real Estate Investing Glossary
In real estate investing, the 70% rule and the 1% rule are distinct screening tools. The 70% rule is designed for house flippers to determine offer limits, while the 1% rule helps buy-and-hold investors evaluate rental property cash flow viability.
Updated with grounded research as of 2026-10-05.
The short answer
The 70% rule and the 1% rule serve different investment goals. The 70% rule assists house flippers in calculating a maximum purchase price to ensure profit margins after repairs, whereas the 1% rule acts as a quick litmus test for rental property investors to gauge if monthly rental income is sufficient relative to the acquisition cost.
Key facts
- 70% Rule Formula
- (After Repair Value [ARV] × 0.70) − Estimated Repair Costs = Maximum Purchase Price
- 1% Rule Calculation
- Monthly Rent ÷ Total Acquisition Cost (Purchase Price + Renovations) ≥ 0.01
Understanding the 70% Rule for Flipping
The 70% rule is a standard guideline used by active investors who plan to renovate and resell a property quickly. By capping the purchase price at 70% of the After Repair Value (ARV), investors create a safety margin. This margin is intended to cover the costs of the flip—including holding costs, financing fees, and unforeseen renovation expenses—while still leaving room for a profit.
- Focuses on quick turnover and profit margin.
- Essential for accounting for unexpected repair costs.
- Commonly used by wholesalers and flippers to estimate project feasibility.
Using the 1% Rule for Rentals
Investors looking to hold property as a long-term rental use the 1% rule to quickly filter potential acquisitions. If a property in Idaho or elsewhere cannot generate monthly rent equal to at least 1% of the total purchase price (including any immediate renovation costs), it may struggle to produce positive cash flow after factoring in mortgage payments, taxes, insurance, and maintenance.
- Primarily serves as a 'back-of-the-napkin' screening tool.
- Helps identify properties that may require further, deeper financial analysis.
- Difficult to apply in high-cost housing markets where property values have risen faster than rental rates.
Limitations in Idaho's Market
As of October 2026, these rules are simplified heuristics, not financial guarantees. Real estate markets in Idaho are diverse; competitive areas like the Treasure Valley may have inventory where the 1% rule is difficult to meet due to higher home appreciation, while rural markets might require different expense ratios. Investors should always conduct a thorough due diligence process that accounts for local Idaho property tax rates, specific HOA fees, and neighborhood-specific rental demand.
- Rules of thumb do not replace detailed pro forma financial statements.
- Local market trends can make these percentages unattainable or misleading.
- Operating expenses (CapEx, vacancy rates) vary by location and property type.
Common questions
Can I use the 70% rule for rental properties?
No, the 70% rule is designed specifically for 'fix-and-flip' projects where the goal is to exit the investment quickly. Using it for rentals may lead you to undervalue properties, as it does not account for long-term cash flow or equity building.
What happens if a property doesn't meet the 1% rule?
Failing the 1% rule does not automatically make a property a bad investment. It simply means the property may not produce immediate, strong cash flow. You should perform a comprehensive cash flow analysis, including actual expenses, to determine if the property fits your specific investment goals.
Related Idaho questions
- What is After Repair Value (ARV) in real estate?
- How do I calculate cash flow for rental property?
- Are there other real estate investment rules of thumb?