Investing metrics
Gross potential rent (GPR)
The maximum rental income a property could produce with every unit occupied at market rent for the full period.
Glossary
Investing metrics
Primary references on this page:
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HUD MAP Guide chapter 7: project income, rent rolls, vacancy, and collection lossGross potential rent (GPR) is the ceiling: what the property would collect if every unit were occupied every day of the year at full market rent. A four-unit building where each unit commands $1,500 a month has a GPR of $72,000 a year. No property actually collects its GPR — vacancy, turnover gaps, non-payment, and below-market leases all pull real collections below it.
GPR earns its place as a baseline, not a forecast. Measuring actual collections against it produces the economic-loss picture: vacancy loss, credit loss, and loss to lease each explain part of the gap. That decomposition is useful because each gap has a different fix — vacancy is a leasing problem, credit loss is a screening and collections problem, and loss to lease is a renewal-pricing problem.
Unit-level formula and example
Build gross potential rent from eligible units times a stated rate basis, prorated under a documented availability policy. Label market, contract, or other rate.
Example: full-month units at $1,400 and $1,600 plus a $1,500 unit entering halfway through a 30-day month produce $3,750 under daily proration.
Assumption register and limitations
Version rates, unit status, down-unit exclusions, and proration, then bridge changes.
Build GPR from a reproducible unit schedule
Consider four units with stated monthly market-rent assumptions of $1,500, $1,600, $1,700, and $1,800. Under a policy that includes every rentable unit for the full month, GPR is $6,600. The schedule must identify the rate source and effective date for each unit. If an offline unit is excluded or prorated, that is a different denominator policy and must be named; changing the denominator after seeing performance destroys comparability.
HUD and Fannie Mae materials illustrate that gross potential income or rent is a starting point that is reduced by vacancy and collection effects. Their program-specific rules are not universal management policy. Use them as evidence that a bridge should state its rent basis, rent roll, and reductions, then document the definition used for this property and decision.
Bridge potential rent to the period result
Using the $6,600 GPR, assume $200 of loss to lease, $850 of physical vacancy for half a month on the $1,700 unit, a $100 approved concession, and $150 of collection loss under the report policy. Net rental income in this illustrative bridge is $5,300. Add $200 of documented laundry and parking income to reach $5,500 of effective gross income. Each reduction has a different owner and remedy, so keep the components separate.
Denominator controls and interpretation limits
Version the unit population, availability state, market or contract rent basis, proration convention, down-unit rule, model and employee-unit treatment, subsidy handling, and rate effective dates. Reconcile the schedule to the rent roll and investigate additions, removals, and changed rates. A manager should be able to reproduce both the current GPR and the change from the prior period without replacing historical assumptions.
GPR is a modeled ceiling, not cash, recognized revenue, market value, or a guarantee that every unit can lease at the assumed rate. A higher GPR can reflect optimistic rate changes or a changed population rather than better operations. Use the component bridge, economic occupancy, actual collections, and evidence for the rate basis before making pricing, staffing, or acquisition decisions.