How does revenue become net income?

The journey from the top line to the bottom line passes through several profit "levels," and each one answers a different question about the business. Learning the levels is more useful than memorizing every expense.

The four profit levels

1. Gross profit = Revenue − COGS. What's left after the direct cost of producing the goods. A software company keeps almost all of its revenue as gross profit (copying software is nearly free); a grocery store keeps little (it pays a lot for what it resells). Gross margin reveals the raw economics of the product.

2. Operating income = Gross profit − operating expenses. After paying to run the business — R&D, sales, marketing, admin (often bundled as SG&A). This is profit from operations, before financing and tax choices. Usually labelled EBIT (earnings before interest and taxes) — though the two part company whenever non-operating income or expense sits between them, as the data note below shows.

3. Pre-tax income = Operating income − interest. After the cost of the company's debt.

4. Net income = Pre-tax income − taxes. The final profit belonging to shareholders.

Why split it into levels at all?

Because where profit disappears is diagnostic. Two companies can have identical net income but reach it completely differently:

• Company A: fat gross margin, heavy operating spend (a brand pouring money into marketing).
• Company B: thin gross margin, lean operations (a discount retailer running on volume).

Same bottom line, opposite businesses. The levels expose the difference; the bottom line alone hides it.

A margin illustration

Using rounded figures, a premium software firm might show a gross margin near 80% but an operating margin of 25% after huge R&D and sales teams. A supermarket might show a gross margin near 25% but squeeze out only a 3% operating margin. Neither is "better" in the abstract — they are different machines, and the income statement lets you see the machinery.

In the data

Every level this lesson names, in one column, from Apple's latest fiscal year:

Read it top to bottom: revenue, gross profit, operating income, income before tax, net income. The EBIT row sits beside operating income and is not the same number. This data measures EBIT at the pre-tax line, so any other income or expense that lands between operations and tax is inside it.

Try it now

1. Calculate all four margins from the table above: gross, operating, pre-tax, net. Each is that profit level divided by total revenue.
2. Which margin drops the most from the level above it? That is where the biggest costs live — production, operations, interest, or tax.
3. Notice that EBIT does not equal operating income here. Other income and expense sit between the two. Naming which one you meant is part of quoting the number.
4. Now the business-model comparison. Below is a retailer read on the published trailing figures:

Divide gross profit by revenue for the retailer and set it beside the gross margin you computed for Apple. The gap is the business-model difference, made numeric. Describe it neutrally.