If revenue is the top line, net income is the bottom line — the last number on the income statement, after every possible cost has been subtracted from what the company brought in. It's the figure that ultimately determines whether a business actually made money during a given period, and it feeds directly into EPS, the P/E ratio, and nearly every other profitability metric investors use.
Net income sounds like a simple concept, but the path from revenue down to it passes through several layers of costs, each of which is worth understanding if you want to know whether reported profit reflects a genuinely healthy business.
The Formula, Layer by Layer
Net income equals revenue minus the cost of goods sold, operating expenses, interest expense, taxes, and any other costs incurred during the period. In practice, the income statement walks through this step by step: revenue minus cost of goods sold produces gross profit; gross profit minus operating expenses (salaries, marketing, research and development) produces operating income; operating income minus interest and taxes produces net income.
Each layer tells you something different about where a company's money is going. A business with strong gross profit but weak net income is likely burdened by heavy debt payments or a large tax bill, while one with weak gross profit has a more fundamental problem with its core product pricing or production costs.
A Worked Example
Here's a simplified walk-through of how revenue becomes net income for a hypothetical company.
Illustrative example — not real company data
| Line item | Amount |
|---|---|
| Revenue | $800 million |
| Cost of goods sold | $450 million |
| Gross profit | $350 million |
| Operating expenses | $220 million |
| Operating income | $130 million |
| Interest expense | $20 million |
| Taxes | $27 million |
| Net income | $83 million |
What a Reasonable Net Margin Looks Like
Net margin — net income divided by revenue — varies enormously by industry, so there's no single healthy percentage that applies everywhere. Directionally, businesses with low overhead and strong pricing power (software, for instance) tend to post higher net margins than capital-intensive or highly competitive industries like retail or airlines, where thin margins are the norm even for well-run companies. The more useful comparison is usually a company's own margin trend over time and how it stacks up against direct competitors in the same industry.
Where to Find It
Net income sits at the very bottom of the income statement in every 10-Q and 10-K filed with the SEC, often labeled 'net income' or 'net earnings.' It's also the figure companies report prominently in quarterly earnings releases, and it flows directly into the statement of cash flows and the retained earnings section of the balance sheet, so it's worth tracing across all three statements to see the full picture.
Limitations to Keep in Mind
Net income is an accounting figure, and accounting rules allow for judgment calls — how depreciation is scheduled, when certain expenses are recognized, and how one-time items are classified can all shift reported net income without reflecting any real change in cash generated by the business. This is exactly why many investors also check free cash flow alongside net income, since cash flow is harder to manipulate through accounting choices and can reveal a different picture than the reported bottom line suggests.
Key Takeaways
- Net income is revenue minus every cost: cost of goods sold, operating expenses, interest, and taxes.
- It's calculated in layers — gross profit, then operating income, then net income — and each layer reveals a different cost pressure.
- Net margin (net income ÷ revenue) varies widely by industry and is best judged against a company's own history and peers.
- Net income is reported at the bottom of the income statement in every 10-Q and 10-K SEC filing.
- Accounting choices around depreciation and one-time items can shift net income without changing actual cash generated.
- Free cash flow is a useful cross-check against net income since it's less affected by accounting judgment calls.
Frequently Asked Questions
What's the difference between net income and revenue?
Revenue is total sales before any costs are subtracted. Net income is what's left after subtracting all costs, interest, and taxes from that revenue. A company can have large revenue and still report negative net income if its costs exceed what it brought in.
Why do companies sometimes report positive net income but negative cash flow?
Net income includes non-cash items like depreciation and can be affected by timing differences, such as revenue recognized before cash is actually collected. This is why cash flow and net income can diverge in a given period even for a fundamentally healthy company.
What is net profit margin and why does it matter?
Net profit margin is net income divided by revenue, expressed as a percentage. It shows how much of every sales dollar ultimately becomes profit, and it's especially useful for comparing efficiency across companies of different sizes within the same industry.
Can net income be manipulated?
Not fabricated outright without violating accounting rules and disclosure requirements, but reported net income can be shaped through legitimate accounting choices, like how conservatively expenses are recognized or assets are depreciated. That's part of why comparing it with cash flow adds useful context.
Conclusion
Net income is the number that ultimately answers whether a company made money, but reaching it means passing through cost of goods sold, operating expenses, interest, and taxes — each layer worth a look on its own. Treat net income as one important data point rather than the whole story, and cross-check it against cash flow and margin trends before drawing conclusions about a company's financial health.