An income statement looks like a wall of numbers, but it tells one story from top to bottom: how much the company sold, what it cost to make and sell it, and what was left for owners. Read it top-down and it takes minutes, not hours.
The income statement covers a period, usually a quarter or a year. It starts with revenue and subtracts costs in layers. Each layer, from gross profit to operating income to net income, tells you something different about the business.
What to look at
- Revenue: total sales. Look at growth rate and whether it is speeding up or slowing down.
- Gross profit = Revenue − Cost of goods sold. Gross margin shows pricing power and how costly the product is to deliver.
- Operating income = Gross profit − Operating expenses (R&D, sales, admin). Operating margin shows how efficiently the whole business runs.
- Net income adds interest, taxes and one-off items. It can be distorted by things unrelated to the core business.
- EPS (earnings per share) = Net income ÷ Diluted shares. Diluted counts options and convertibles that could become shares.
The shape of it
Operating margin = Operating income ÷ Revenue
An example
A software company grows revenue 25% with an 80% gross margin and a 5% operating margin. The product is profitable to deliver; the business is spending heavily to grow. Watch whether operating margin rises as growth slows.
Where people go wrong
Rising revenue with shrinking margins can mean the company is buying growth with discounts or spending. Read growth and margins together, never one without the other.
After a few companies you will start reading margins the way a doctor reads vital signs. A sudden change in one is rarely the whole story, but it is almost always worth a question.