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How It Works
The operating expense ratio shows what percentage of a property's income goes toward operating expenses. A lower OER means the property keeps more of each dollar earned. It helps investors compare management efficiency across properties.
OER excludes debt service, capital expenditures, and depreciation. It focuses purely on recurring operating costs like property tax, insurance, maintenance, and management fees.
Example Problem
A property has $45,000 in operating expenses and $120,000 in gross operating income.
- OER = ($45,000 / $120,000) × 100 = 37.5%
This means 37.5 cents of every dollar earned goes to operating costs, leaving 62.5% for debt service and profit.
Frequently Asked Questions
What is a normal operating expense ratio?
For residential multifamily, OER typically runs 35–45%. Office buildings may run 40–50%. NNN (triple net) leases can have OERs below 20% since tenants cover most expenses.
How does OER relate to NOI?
OER and NOI are inversely related. If OER is 40%, then NOI equals 60% of GOI. Reducing OER from 45% to 40% on $200,000 GOI increases NOI by $10,000.
Why might a property have a high OER?
High OER can signal deferred maintenance catching up, above-market management fees, or aging systems that cost more to operate. It can also indicate the property is in a high-tax area. Compare OER to similar properties in the market.
Related Calculators
- Net Operating Income Calculator — compute income after expenses.
- Gross Operating Income Calculator — determine income before expenses.
- Break Even Ratio Calculator — include debt service in the analysis.
- Capitalization Rate Calculator — convert NOI to property value.
- Vacancy & Credit Loss Calculator — estimate income reductions that affect the ratio.
Reference: Gallinelli, Frank. 2004. What Every Real Estate Investor Needs to Know About Cash Flow. McGraw-Hill.