An expenditure ratio sometimes referred to as an operating expense ratio (OER), is a statistic used to compare a property’s running costs to the income it brings in. Use the following formula to calculate a property’s operating expense ratio:
Operating Expense Ratio = Operating Expenses / Gross Operating Income
For instance, a building with $40,000 in annual running costs and $100,000 in gross revenue would have a 40% OER.
Operating Expense Ratio: $40,000/$100,000 = 40%
Investors and developers may use gross operational income in place of gross prospective rent (GPR) if a property has not yet been constructed. Then, they can include any additional projected income streams and remove the anticipated vacancy rate to arrive at a reasonable operating expense ratio.
OER (operating expense ratio) often includes costs like management fees, insurance, property taxes, utilities, garbage removal, repairs and maintenance (R&M), and R&M. Loan payments and capital investments (CapEx) made to improve a property’s value or replacement an effective system, however, are not.
The best ways to comprehend the operating expense ratio in commercial real estate are to compare properties that are similar to see if one is being managed well, to compare year-to-year OERs (operating expense ratio) on the same property to see if costs are increasing too quickly and to use the formula Operating Expenses/Gross Operating Income = Operating Expense Ratio to figure out a property’s OER (operating expense ratio). Investors and developers can also replace gross operating revenue for gross prospective rent (GPR), add any additional anticipated sources of income, and deduct the anticipated rate of vacancy to arrive at a realistic operating expense ratio for a property that has not yet been developed.
OER (operating expense ratio) includes costs for utilities, trash disposal, repairs, and maintenance (R&M), management fees, insurance, and property taxes, but excludes loan payments and capital expenditures (CapEx) that are made to improve the value of a property or replace a significant system.
How Operating Expense Ratios are Used by Commercial Real Estate Developers and Investors
Energy-efficient Operating expenditure ratios are most frequently employed in commercial real estate to compare properties and ascertain if a property is being managed efficiently. For instance, if an investor wishes to buy an industrial property with a 55% OER but the majority of nearby industrial buildings with a comparable OER are only 40%, the investor could infer that the property is not being managed well.
A year-by-year OER comparison on the same property can be used in addition to comparing several properties to see if costs are increasing too much in a particular area (such as utilities). This can then be used to decide on a cost-cutting strategy (such as making renovations to buildings that are more energy efficient).
Overall, if a property’s costs are increasing more quickly than its rent, the OER will increase and the project will become more and more unprofitable. The OER remains constant if a property’s running costs and rent increase at the same pace. The OER, however, also drops if the rental revenue for the property rises or keeps the same while running costs go down.

What Typical Errors Should Be Avoided When Determining The Operating Expense Ratio For Commercial Real Estate?
When determining the operational expense ratio in commercial real estate, it is important to avoid making the following mistakes:
- Add loan repayments and capital investments (CapEx) to operational costs.
- not taking vacancy into account when calculating gross operational income.
- Without taking into consideration all costs associated with running the business, including rent, utilities, garbage collection, repairs and upkeep, management fees, insurance, and property taxes.
CONCLUSION
A lower operational expenditure ratio frequently denotes improved management and higher property investment returns. In essence, a lower percentage of the property’s profits goes toward covering ongoing operating and maintenance costs. If the property is viable, the owner may increase the rent for each unit without considerably increasing operating expenditures.
Furthermore, the operational expense ratio can predict future issues, such as significant increases in electricity costs, allowing investors to take action sooner and preserve profit margins.
As informed investors, we should understand the risks associated with real estate investing and that there is no guarantee. Please do your due diligence.









