Gross potential income (GPI) is the maximum possible rental income a property could generate if fully occupied at market rent, before accounting for vacancy or collection losses. GPI is the starting point in a standard income analysis, subsequently adjusted by a vacancy allowance to reach effective gross income.
GPI in the standard income analysis waterfall
| Step | Calculation |
|---|---|
| Gross Potential Income (GPI) | 100% occupancy at market rent |
| Effective Gross Income (EGI) | GPI minus vacancy allowance |
| Net Operating Income (NOI) | EGI minus operating expenses |
What to watch for before committing
Market rent basis accuracy
Confirm GPI is calculated using genuinely current market rent, not outdated or overly optimistic assumptions.
Multi-tenant vs single-tenant applicability
Recognize GPI is most meaningfully applied to multi-tenant properties, since single-tenant buildings simply use the actual lease rent.
Distinguishing GPI from in-place income
Understand that GPI represents theoretical maximum income, which may differ significantly from actual current in-place rents if leases are below market.
Realistic vacancy allowance pairing
Always evaluate GPI alongside a realistic vacancy allowance, since GPI alone overstates achievable income.
Underwriting assumptions transparency
When reviewing an investment analysis, confirm exactly how GPI assumptions were derived and whether they're reasonable.
Impact of below-market leases
If existing leases are below current market rent, understand the gap between actual current income and calculated GPI.
When you need to know this
- Evaluating an investment property's income potential — establishing the theoretical maximum revenue baseline
- Underwriting a value-add acquisition — assessing upside potential if below-market leases roll to current market rent
- Comparing properties on a standardized basis — using GPI as a consistent starting point across different income analyses
- Understanding investment analysis waterfalls — recognizing how GPI flows into effective gross income and NOI calculations
Frequently asked questions
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