What is an income statement?

An income statement, sometimes called a profit and loss statement, is a financial report showing a company’s revenue, expenses, and resulting profit or loss over a specific period, such as a fiscal quarter or year.

What is the first line of an income statement?

The first line is typically total revenue, sometimes called net sales, representing all money earned from the company’s core business activities before any costs are subtracted.

What is gross profit?

Gross profit is revenue minus the cost of goods sold (COGS) — the direct costs of producing the goods or delivering the services that generated that revenue.

What is operating income?

Operating income is gross profit minus operating expenses, such as selling, general and administrative costs and research and development, reflecting profit from core operations before interest and taxes.

What is the difference between operating income and net income?

Operating income reflects profit from core business operations alone, while net income also accounts for non-operating items such as interest expense, investment gains or losses, and taxes.

Why is net income called the "bottom line"?

Net income appears as the final line of the income statement after every expense category has been subtracted, which is why it’s colloquially referred to as the bottom line.

What is the difference between the income statement and the balance sheet?

The income statement shows performance over a period of time, while the balance sheet shows a snapshot of what a company owns and owes at a single point in time.

What are operating expenses?

Operating expenses are the ongoing costs of running the business that aren’t directly tied to producing goods or services, such as marketing, administrative salaries, and research and development.

Can a company have rising revenue but falling net income?

Yes — if costs grow faster than revenue, or if a company incurs large non-operating charges like interest expense or a write-down, net income can fall even as top-line revenue climbs.

How does the income statement relate to earnings per share?

Net income, the final figure on the income statement, is the numerator used to calculate earnings per share once preferred dividends are subtracted and it’s divided by the weighted average share count.

How to Read an Income Statement | Imperialpedia

Of all the documents inside an earnings report, the income statement is arguably the most important — and the most misread. Learning how to read an income statement means understanding how a business turns sales into profit, one line at a time.

What the Income Statement Shows

The income statement, sometimes called a profit and loss statement, reports a company's financial performance over a defined period — a quarter or a full fiscal year. Unlike the balance sheet, which is a snapshot at a single moment, the income statement covers a stretch of time, showing the flow of money in and out of the business.

The Structure, Step by Step

Most income statements follow a consistent top-to-bottom flow:

Line item	What it represents
Revenue (net sales)	Total money earned from core business activity
− Cost of goods sold (COGS)	Direct costs of producing goods or services sold
= Gross profit	Revenue left after direct production costs
− Operating expenses	Marketing, admin, R&D, and other operating costs
= Operating income	Profit from core operations before interest and taxes
+/− Non-operating items	Interest expense, investment gains/losses, one-time items
= Pretax income	Profit before taxes are applied
− Taxes	Income tax expense for the period
= Net income	The company's final "bottom line" profit

Revenue: The Starting Point

Everything begins with revenue, also called net sales — the total amount earned from selling goods or services before any costs are removed. This is the figure most closely tracked for growth, but on its own it says nothing about profitability. See our companion guide on revenue vs earnings for why this distinction matters so much.

Gross Profit: The First Profitability Checkpoint

Subtracting the cost of goods sold — the direct cost of producing what was sold — from revenue gives gross profit. This figure, and the gross margin percentage derived from it, shows how efficiently a company converts sales into profit before considering broader operating costs.

Operating Income: Core Business Performance

After subtracting operating expenses like marketing, administrative overhead, and research and development from gross profit, you arrive at operating income. This figure isolates how profitable the core business is, stripped of financing decisions and tax effects — useful for comparing companies with different capital structures.

Operating income is often considered a cleaner measure of core business health than net income, because it excludes interest expense and tax effects that can vary significantly for reasons unrelated to day-to-day operations.

Net Income: The Bottom Line

Finally, after accounting for interest expense, investment gains or losses, one-time items, and taxes, you reach net income — the number most closely associated with a company's overall profitability, and the starting point for calculating earnings per share.

Common Mistakes

Focusing only on the top (revenue) and bottom (net income) lines while skipping the middle, where margin trends actually live.
Ignoring gross margin trends, which often reveal cost pressures before they show up in net income.
Confusing operating income with net income when comparing companies with different debt loads or tax situations.
Not checking whether reported figures are GAAP or non-GAAP — see our guide on GAAP vs non-GAAP earnings.

Expert Tips

Calculate gross margin and operating margin yourself each quarter rather than relying only on the headline dollar figures, since percentages reveal trends dollars alone can hide.
Compare a company's income statement structure to close industry peers, since "normal" cost ratios vary significantly between sectors.
Read the notes accompanying the income statement in the full filing when a specific line item looks unusual — the explanation is often there.
Track how each major line item moves as a percentage of revenue over several quarters to catch shifts in cost structure early.

Conclusion

The income statement tells the full story of how a company converts sales into profit, and reading it line by line — rather than jumping straight to the bottom — reveals far more than the headline numbers alone. Once this structure feels familiar, comparing income statements across quarters and companies becomes a genuinely powerful analytical habit.