Quick rental property screening using the 50% rule. Estimate expenses as half of gross rent to project cash flow.
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Property
Purchase Price
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Monthly Rent
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Pro Forma Rent
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Down %
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Rate %
%
As-Is EstimateCurrent
Pro Forma Estimate
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Est. Cash Flow
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50% rule
Est. Expenses
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/mo
Passes 50% Rule?
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Rough CoC
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estimate
50% Rule Calculation
Monthly Rent—
50% Operating Expense Est.—
Mortgage P&I—
Estimated Cash Flow—
After plan
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Pro Forma CF
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at higher rent
Est. Expenses
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/mo
Mortgage P&I
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Pro Forma CoC
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Pro Forma 50% Analysis
Pro Forma Rent—
50% Expense Estimate—
Mortgage—
Cash Flow Estimate—
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The 50% rule estimates that operating expenses will be approximately 50% of gross rent — NOT including the mortgage. Enter rent and mortgage details to get a quick cash flow estimate.
The 50% Rule is a real estate investing heuristic: expect operating expenses (taxes, insurance, maintenance, vacancy, management) to equal roughly 50% of gross rent. Subtract the remaining 50% from mortgage payment to estimate cash flow. It's a quick screen, not a substitute for detailed analysis.