Walk line-by-line through an income statement — from revenue down to EPS — and learn the margin ratios that reveal a company's true profitability.
The income statement answers one question: Did the company make money during this period? It starts with revenue (everything the company earned) and subtracts every category of cost to arrive at net income — the profit left for shareholders.
It covers a period of time — usually one quarter (three months) or one full year. This makes it different from the balance sheet, which is a point-in-time snapshot.
Here is a simplified income statement for a hypothetical technology company with $10 billion in revenue:
Raw dollar profits don't tell you how efficient a business is. Margin ratios convert profits to percentages, making it easy to compare companies of any size — and track a single company over time.
Measures how much revenue is left after direct production costs. High gross margins mean the product has strong pricing power.
Measures profitability after all operating costs including R&D and SG&A. Shows how efficient management is at running the business.
The true 'bottom line' margin after taxes and interest. This is the percentage of every revenue dollar that flows to shareholders.
EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It strips out non-cash charges (depreciation and amortization) to give a rough proxy for operating cash generation.
Analysts use it to compare companies across different capital structures (debt levels) and accounting methods. It's especially common in acquisition analysis and for capital-intensive industries like telecom or manufacturing.
EBITDA is useful for comparisons but can overstate cash generation because CapEx (capital spending) isn't subtracted. In Lesson 4 we'll see why Free Cash Flow is usually a better measure of true profitability.
Investors pay close attention to year-over-year (YoY) revenue growth — how much the top line grew compared to the same quarter last year. High-growth companies command premium valuations; declining revenue is one of the biggest red flags.
15%+ YoY growth in a mature company, or 30%+ for a growth-stage company, signals strong demand. The market typically rewards this with a higher P/E multiple.
Revenue growing more slowly each quarter (even if still positive) often triggers a sell-off. Watch for this in high-multiple growth stocks — it's called "growth deceleration."
A company has $500M in revenue and $200M in cost of goods sold. What is the gross margin?
What is the difference between operating income and net income?
Company A has a 35% net margin. Company B has a 6% net margin. Which is always the better investment?
Use our stock comparison tool to see revenue growth, gross margin, and net margin side by side for any two companies.