Formula
Gross Profit = Revenue − Cost of Goods Sold (COGS) Operating Income = Gross Profit − Operating Expenses (SG&A, R&D) Net Income = Operating Income − Interest − Taxes (+/− other items)
The Short Version
The income statement peels back profitability in layers, and each layer answers a different question about the business.
Explain It Like I'm 10
Imagine a kid selling friendship bracelets. She sells one for $10. The string and beads cost $4, leaving $6 'gross profit' just from making and selling the bracelet. But she also has to pay $1 for a table rental at the school fair (an operating expense), leaving $5 'operating profit.' Then she owes her parents $1 in 'taxes' (a cut for driving her there), leaving $4 as her final, true take-home profit. Each layer strips away a different type of cost.
Step-by-Step Example
- 1 Revenue: $10. Cost of goods (string, beads): $4. Gross Profit = $10 − $4 = $6 (Gross Margin = 60%).
- 2 Operating expenses (table rental): $1. Operating Income = $6 − $1 = $5 (Operating Margin = 50%).
- 3 Interest and taxes: $1. Net Income = $5 − $1 = $4 (Net Margin = 40%).
- 4 If NEXT week her gross margin stays 60% but her operating margin drops to 30%, that tells you the extra cost pressure is coming from overhead (the table rental went up), not from the bracelets themselves.
- 5 Tracking all three margins over time pinpoints exactly WHERE a business's cost problems (or improvements) are coming from.
Quick Recap
- ✓ Gross margin (Gross Profit ÷ Revenue): how efficiently the company produces what it sells, before overhead.
- ✓ Operating margin (Operating Income ÷ Revenue): profitability from core business operations, before financing costs and taxes.
- ✓ Net margin (Net Income ÷ Revenue): the bottom-line profitability after everything, including interest and taxes.
- ✓ Comparing these three margins over time reveals whether cost pressure is coming from production, overhead, or financing/taxes.