Understanding net operating income
The income statement of a firm indicates the flow of sales, expenses and earnings during a period of time, typically on a monthly, quarterly or yearly basis.
Net Operating Income (NOI) is the product of subtracting operating expenses from gross income, excluding depreciation and amortization. In particular:
Gross income: it includes any type of income associated with a property such as plant and equipment, parking fees, vending receipts etc.
Operating expenses: they are costs incurred during the operation and maintenance of a property. They include repairs and maintenance, insurance, management fees, utilities, supplies, property taxes, etc.
Depreciation: it is an annual charge that reflects the estimated costs of the assets used during a specific period, typically a year. Depreciation refers typically to the plant and equipment, i.e. the tangible assets of the firm and it is subtracted after Net Operating Income is calculated in order to calculate the Net Income of the firm.
Amortization: it is an annual charge that reflects the estimated costs of the assets used during a specific period, typically a year. Amortization refers typically to the intangible asses of the firm such as loans, patents, goodwill etc. and it is subtracted after Net Operating Income is calculated in order to calculate the Net Income of the firm.
Example
We assume the following income statement in order to calculate the Net Operating Income (NOI) of firm X:
1/ Calculating Gross Income
Net Sales = 38,000$
Cost of Sales = 23,700$
Gross Income = Net Sales – Cost of Sales = 38,000$ – 23,700$ = 14,300$
2/ Calculating Operating Expenses
Rent = 1,000$
Salaries = 3,500$
Utilities = 400$
Supplies = 1,500$
Equipment Repair and Maintenance = 150$
Advertising & Promotion = 1,600$
Loan Interest = 250$
Operating Expenses = 1,000$ + 3,500$ + 400$ + 1,500$ + 150$ + 1,600$ + 250$ = 8,400$
3/ Calculating Net Operating Income (NOI)
Net Operating Income = Gross Income – Operating Expenses = 14,300$ – 8,400$ = 5,900$
Net Operating Income (NOI) is used when calculating the Operating Profit Margin ratio of a firm. Operating Profit Margin ratio measures the operating efficiency of a firm indicating if the relationship of the fixed costs to the production volume. The higher the ratio, the better a company is because this indicates that the firm’s fixed costs are lower than the firms’ gross income.
The ratio is calculated as follows:
Operating Profit Margin = Net Operating Income (NOI) / Net Sales.
Assuming above example and plugging in our data in the formula we derive that:
Operating Profit Margin = Net Operating Income (NOI) / Net Sales = 5,900$ / 38,000$ = 15.5%
This means that firm X makes $0.15 before interest and taxes for every dollar of sales.
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