Pro Investor Academy
LESSON 2.2
8 min learning time

Understanding the Income Statement

The income statement shows what a company earned and spent over a period, walking from revenue down to profit.

The short answer

The income statement walks from total revenue down through the costs of running the business to arrive at net income, the profit left for shareholders. Reading it well means watching the margins at each step, not just the numbers at the top and bottom.

Learning objectives

  • Name the main lines of an income statement in order
  • Explain the difference between gross profit, operating income and net income
  • Calculate earnings per share from net income and shares outstanding
  • Explain what gross, operating and net margin each reveal about a business

The statement is a walk-down

The income statement starts with revenue, the total amount a company earned from customers over a period, then subtracts costs in stages to arrive at profit.

Each stage removes a different kind of cost, which is why looking only at the top line or the bottom line skips useful information in between.

From revenue to gross profit

Cost of revenue (also called cost of goods sold) covers the direct cost of producing or delivering what was sold. Revenue minus cost of revenue equals gross profit.

Gross margin — gross profit divided by revenue — shows how much a company keeps from each dollar of sales before it pays for marketing, research or administration.

From gross profit to operating income

Operating expenses include costs like sales and marketing, research and development, and general administration. Subtracting these from gross profit gives operating income, a measure of profit from the core business itself.

Operating margin — operating income divided by revenue — is one of the clearest single measures of how efficiently a business runs, because it excludes financing and tax decisions that vary company to company.

From operating income to net income

Net income subtracts remaining items such as interest expense and taxes from operating income. It is the profit that belongs to shareholders, whether paid out or reinvested.

Dividing net income by shares outstanding gives earnings per share (EPS), the profit figure most often compared across companies and used to calculate the P/E ratio.

A hypothetical income statement walk-down
1Revenue$100 million

Total sales for the period

2− Cost of revenue$40 million

Direct cost of producing what was sold

3= Gross profit$60 million

Gross margin: 60%

4− Operating expenses$35 million

Marketing, R&D, administration

5= Operating income$25 million

Operating margin: 25%

6− Interest and taxes$7 million

Financing costs and tax

7= Net income$18 million

Net margin: 18%

Every stage removes a different type of cost. This is a hypothetical illustration, not a real company's figures.

Key concepts

Select a term to read its definition.

  • Revenue

    Total sales before any costs are subtracted.

    Full explanation of Revenue
  • Cost of revenue

    The direct costs of producing the goods or services a company sold in a period.

    View in the glossary
  • Gross margin

    Revenue minus cost of revenue, shown as a percentage of revenue.

    View in the glossary
  • Operating margin

    Operating profit as a percentage of revenue — a measure of operational efficiency.

    Full explanation of Operating margin
  • Net income

    Profit after all expenses, interest and taxes for a period — the bottom line of the income statement. Often called earnings.

    View in the glossary
  • EPS

    Earnings per share. Basic EPS is earnings available to common shareholders divided by weighted-average common shares; diluted EPS also counts potential shares from options and convertibles.

    Full explanation of EPS
See the full glossary

Why this matters

Margins tell you whether growth is translating into profit, or simply into more revenue at the same or worse economics. That distinction matters far more to a long-term owner than the headline growth rate alone.

Common mistakes

  • Comparing net income across companies without checking whether one-off items distorted the figure
  • Assuming rising revenue automatically means a healthier business, without checking whether margins are holding up

Check your understanding

No score is recorded. This is only here to test whether the lesson landed.

1. What does gross profit measure?
2. True or false: a company can grow revenue every year while its net margin is shrinking.
3. Two hypothetical companies report the same net income this year. One has a rising operating margin over the last five years and the other a falling one. What does that difference suggest about further research?

0 of 3 answered. Answer every question to see the answers.

Key takeaways

  • The income statement moves from revenue down to net income through a series of cost subtractions
  • Gross, operating and net margin each answer a different question about efficiency and profitability
  • Earnings per share is net income divided by shares outstanding
  • A rising or falling margin trend over several years is often more informative than any single year's result
Written by
Pro Investor Academy Research Team
Content type
Educational article
Published
2026-09-13
Last reviewed
2026-09-13

Sources

What Owning a Stock MeansUnderstanding the Balance Sheet

Educational content only. This lesson is not investment, tax or legal advice and does not recommend buying or selling any specific investment. All investing involves the risk of loss.