Operating Expense Ratio: Define the Expenses Before Comparing the Percentage

Corporate example: 25% overhead does not mean 75% profit

Consider a hypothetical company with $100m revenue, $60m cost of sales, $18m SG&A and $7m separately reported R&D. Assume no other operating items. Overhead is $25m, gross profit is $40m and operating profit is $15m. Under this definition, operating margin equals gross margin minus the overhead ratio: 40% − 25% = 15%.

Map the reported line items before adding them

Company statements and data providers may use operating expenses for different subtotals. Check whether a subtotal already includes cost of revenue, R&D, depreciation or other items. SG&A includes general and administrative expenses; adding both the combined figure and its components double-counts costs. Gross-profit and operating-profit reconciliations are more reliable checks than a field name alone.

• Use revenue for the same reporting period and entity as the expenses. ARR is a recurring-revenue run rate and is not interchangeable with recognized annual revenue.
• Distinguish reported costs from adjusted figures that exclude stock compensation, restructuring or other items. Reconcile any exclusions consistently.
• A change from expensing to capitalizing a cost can lower the current-period expense ratio while shifting expense recognition into future periods.
• If revenue is zero or absent, do not report a finite expense percentage. Negative revenue requires a separate explanation.

Property example: use effective gross income

Suppose potential annual rent is $120,000, vacancy and collection losses are $6,000, and other collected property income is $6,000. Effective gross income is $120,000 − $6,000 + $6,000 = $120,000. If defined property operating expenses are $48,000, OER is 40% and the remaining income before debt service and capital expenditure is $72,000. These figures are an illustration, not a market benchmark.

• State whether the expense total includes property taxes, insurance, utilities, repairs, management and replacement reserves.
• Keep mortgage principal, interest, depreciation and major capital expenditure separate from this operating-expense calculation.
• Underwriting and appraisal conventions differ. The California BOE lesson, for example, shows property taxes separately from other operating expenses; reconcile that treatment before comparing its ratios with an expense total that includes taxes.

Separate cost efficiency from accounting presentation

Return to the corporate example. Reclassifying $5m from overhead to cost of sales changes overhead from 25% to 20% and gross margin from 40% to 35%; operating margin remains 15%. The lower overhead percentage alone is not an efficiency gain. Conversely, a temporary increase in research or maintenance spending may support future operations. Assess service quality, growth and the sustainability of any reduction.