What does an income statement actually show?

If the balance sheet is a photograph, the income statement is a movie. It doesn't ask "what do we have?" — it asks "how did we do over a period of time?" A quarter, a year: revenue in at the top, expenses subtracted step by step, profit or loss at the bottom.

You'll hear three names for the same thing: income statement, profit and loss (P&L), and statement of operations. All identical.

The shape: a waterfall from top to bottom

An income statement flows downward, subtracting as it goes:

• Revenue (or sales, or the top line) — total money from selling goods and services.
• minus Cost of goods sold (COGS) — the direct cost of making what was sold.
• = Gross profit — what's left to cover everything else.
• minus Operating expenses — salaries, marketing, research, rent.
• = Operating income — profit from the actual business.
• minus Interest and taxes — the cost of debt and the government's share.
• = Net income — the bottom line. The profit that belongs to shareholders.

Each subtraction is a checkpoint. Where the money leaks out tells you how the business works.

A rounded illustration

A simplified year for a company like Nike might look like (illustrative, rounded):

• Revenue: $50B
• COGS: $28B → Gross profit $22B
• Operating expenses: $16B → Operating income $6B
• Interest + taxes: $1B → Net income $5B

So of every $100 of sales, about $10 survived to the bottom line as profit. That single fact — how much of the top line reaches the bottom — is the heart of income-statement reading.

The crucial catch

Net income is not cash. The income statement is built on accrual accounting: it records revenue when it's earned and expenses when they're incurred, regardless of when cash actually moves. A company can report a healthy profit and still be short of cash — which is exactly why the third statement exists. Hold that thought; it's the theme of Unit 3.

Try it now

Apple's most recent complete financial year, as filed:

1. Find the top line (total revenue) and the bottom line (net income). Divide the second by the first — that is the net margin, the share of sales that became profit.
2. Walk the waterfall in the table. Revenue minus cost of revenue should give the gross profit row; check it. The table has no row for operating expenses, so run the next step backwards: gross profit minus operating income is what it cost to run the company that year. Say how large that is as a share of revenue.
3. For the prior-year comparison, read the two newest years at the top of this table:

Growing top line with a shrinking bottom line (or the reverse) is a story worth noticing — as an observation to explore, never a prediction.