A vacancy allowance is an estimated percentage deduction applied to gross potential income to account for expected vacancy and collection losses over a given period, used to calculate a more realistic effective gross income figure. The specific vacancy allowance percentage used significantly affects investment income projections and should be grounded in realistic market and property-specific data.
How vacancy allowance is typically estimated
A reasonable vacancy allowance considers current submarket vacancy rate data, the specific property's historical vacancy experience, tenant credit quality and lease term remaining (for single-tenant properties), and broader market absorption trends. Underwriters should be skeptical of unrealistically low vacancy allowance assumptions used to inflate a projected income figure and, correspondingly, a property's apparent value.
What to watch for before committing
Realistic grounding in market data
Confirm the vacancy allowance percentage is grounded in current submarket vacancy data, not an arbitrary or overly optimistic assumption.
Historical property-specific experience
Compare the assumed vacancy allowance against the specific property's actual historical vacancy experience.
Single-tenant credit risk consideration
For single-tenant properties, factor in tenant credit quality and remaining lease term when assessing appropriate vacancy risk.
Collection loss component
Understand whether the vacancy allowance also accounts for potential collection losses from tenant default, not just physical vacancy.
Sensitivity analysis
Consider running sensitivity analysis with different vacancy allowance assumptions to understand how much this input affects overall valuation.
Seller or broker bias awareness
Be skeptical of unrealistically low vacancy allowance assumptions that might be used to inflate a property's apparent income and value in marketing materials.
When you need to know this
- Underwriting an investment acquisition — establishing realistic income projections for valuation purposes
- Evaluating seller or broker income projections — critically assessing whether vacancy assumptions are reasonable
- Comparing properties with different risk profiles — adjusting vacancy allowances to reflect property-specific and tenant-specific risk
- Stress-testing an investment analysis — understanding sensitivity of valuation to vacancy allowance assumptions
Frequently asked questions
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