Operating Budget Anatomy
How planned revenue minus operating expenses becomes operating income
A division plans $500,000 of revenue and $420,000 of operating costs for the month. Will it turn a profit, and how much? The operating budget answers in one line.
What sits inside an operating budget
An operating budget is the planned profit-and-loss statement for a period. It starts with planned Revenue ($R$), subtracts the Cost of Goods Sold ($COGS$) to reach Gross Profit, then subtracts operating expenses ($OpEx$, such as selling, general, and administrative costs) to reach Operating Income. It deliberately excludes interest and other financing costs, taxes below the operating line, and capital expenditure, because those are decided outside day-to-day operations.
Reading the formula
Operating Income ($OI$) is what remains after the operating engine of the business has been paid for. Two intermediate lines matter. Gross Profit ($GP = R - COGS$) shows what the core product engine earns before overhead. Operating Income then subtracts $OpEx$ to show whether the whole operating model is profitable. Dividing $OI$ by $R$ gives the operating margin, the share of each revenue dollar that survives as operating profit.
Interest on a bank loan is a financing item, a new factory purchase is capital expenditure, and repaying loan principal is a financing flow. None of these belong in the operating budget, which captures only the recurring revenue and operating expense lines of the business.
- 1. Gross Profit = R - COGS = 500,000 - 300,000 = $200,000.
- 2. Operating Income = GP - OpEx = 200,000 - 120,000 = $80,000.
- 3. Operating margin = OI / R = 80,000 / 500,000 = 16%.
💡 Hint
Check your understanding
- An operating budget runs from Revenue to Gross Profit to Operating Income.
- It includes COGS and OpEx, but excludes financing and capital expenditure.
- Operating margin equals Operating Income divided by Revenue.