Income Statement

The income statement — sometimes called the profit and loss statement, or P&L — is the report that tells you whether a company actually made money over a given period, usually a quarter or a year. Of the three core financial statements, it is often the first one investors learn to read, because its logic is intuitive: it starts with everything the company sold, then subtracts everything it cost to sell it, arriving at what's left over for shareholders. Learning to read it well is one of the first steps toward practicing value investing.

How the Statement Flows

An income statement is built top to bottom, with each line subtracting a new category of cost from the line above it. Understanding this flow makes the whole statement much easier to digest.

Revenue (also called sales or turnover) sits at the very top. It is the total amount of money a company brought in from selling its products or services, before any costs are deducted. Every other line on the statement is, in some sense, a subtraction from this number.

Cost of goods sold (COGS), also called cost of revenue, is what it directly cost to produce or deliver whatever was sold — raw materials, factory labor, direct manufacturing overhead. Subtracting COGS from revenue gives you gross profit, and dividing gross profit by revenue gives you the gross margin. Gross margin is one of the most important ratios on the entire statement, because it reveals how much room a company has between what it charges and what it costs to make the thing.

Below gross profit come operating expenses, the costs of running the business that aren't tied directly to production. The two biggest categories are usually:

Research and development (R&D) — money spent creating new products or improving existing ones.
Selling, general and administrative expenses (SG&A) — marketing, sales staff, executive salaries, office costs, and other overhead.

Subtracting operating expenses from gross profit gives operating income (also called operating profit or EBIT, for earnings before interest and taxes). Dividing operating income by revenue gives the operating margin, which shows how profitable the core business is before financing and tax effects are layered on.

From operating income, the statement then subtracts interest expense (the cost of servicing debt) and adds or subtracts other non-operating items, arriving at pre-tax income. Subtracting taxes from that produces net income — the famous "bottom line," representing what's left for shareholders after every expense, obligation, and tax bill has been paid.

Finally, net income is divided by the number of shares outstanding to produce earnings per share (EPS). You'll typically see two versions: basic EPS uses the actual current share count, while diluted EPS assumes that stock options, convertible bonds, and other securities that could turn into shares eventually do. Diluted EPS is almost always the more conservative and more meaningful number, since it reflects the maximum potential dilution to existing owners.

Digging Deeper

Reading an income statement isn't just about checking whether a company was profitable last quarter — it's about spotting patterns that reveal the underlying quality and durability of the business. A handful of individual line items reward a much closer look than the summary above can give them, each covered in more depth elsewhere in this resource library:

High Gross Margins — what consistently high or stable gross margins tend to signal about pricing power and moats, and what eroding margins tend to warn about.
R&D Spending — why "low R&D" isn't automatically a good sign, and how the right level of spending depends heavily on the industry.
Sales & Marketing — why some of the best businesses barely need to spend on it at all, and why that's a moat signal in itself.
Net Margin — why a rising or stable net margin, watched over many years, says more than any single quarter's number.

Taken together, these signals help identify a business that can convert sales into durable, growing profit — a key ingredient in estimating a company's intrinsic value and in judging its return on invested capital. None of these figures should be read in isolation, though; a single strong quarter means little, and the real insight comes from watching how these metrics behave across many years, and always with a margin of safety in your final judgment about price.