Investing term

What is Income statement?

The 'movie' statement — what came in (revenue), what was spent (costs), and what was left as profit, over a period.

The income statement is the 'movie' of a company's performance over a period: revenue at the top, costs subtracted line by line, and profit at the bottom. It shows how a company makes (or loses) money and where the costs go, quarter by quarter or year by year.

It reads as a waterfall from the 'top line' (revenue) to the 'bottom line' (net income). Along the way, subtracting the direct cost of the product gives gross profit; subtracting operating expenses gives operating income; and subtracting interest and tax gives net income. Unlike the balance sheet's single-date snapshot, the income statement covers a span of time — a story of one period's earnings — which is why it's paired with the balance sheet and cash flow statement for the full picture.

Revenue whittled to the bottom line
RevenueTOP LINE$100Gross profit$40− $60 cost of goods soldOperating income$18− $22 operating expensesNet incomeBOTTOM LINE$10− $8 interest & tax

The income statement flows from the top line (revenue) down through each cost to the bottom line (net income) — here $100 of revenue becomes $10 of profit. It's the 'movie' of one period's earnings.

For example

Revenue of $100 flows down through cost of goods sold, operating expenses, and interest and tax to a $10 net income — the same $100 whittled to the bottom line.

Learn it by doing

That's Income statement in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 14, Reading Financial Statements).

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Why it matters to you

The income statement matters because it's where profitability is judged and earnings per share is derived — the numbers that drive valuations. Reading it as a waterfall shows exactly where the money goes and which costs are eating the most, revealing whether a company's problem is weak sales, high production costs, or bloated overhead. But because it relies on accounting judgements, it's best read alongside the cash flow statement, which checks whether the reported profit is backed by real cash.

⚠ Trusting profit without checking cash

The income statement's profit relies on accounting estimates and accruals, so a company can report healthy earnings while actually burning cash. Judging a business on net income alone, without cross-checking the cash flow statement, can miss a company whose profits aren't turning into real money. Always read the income statement alongside cash flow.

Frequently asked questions

What is an income statement?

The income statement shows a company's revenue, costs, and profit over a period, from the top line (revenue) down to the bottom line (net income). It reveals how the company makes money and where its costs go, covering a span of time rather than a single date.

What's the difference between the income statement and the balance sheet?

The income statement covers performance over a period — revenue and costs flowing to profit — like a movie. The balance sheet is a snapshot on a single date, showing what the company owns, owes, and has left for owners. One shows the flow of earnings; the other shows the financial position.

How do I read an income statement?

Follow it as a waterfall from top to bottom: revenue, minus cost of goods sold gives gross profit, minus operating expenses gives operating income, minus interest and tax gives net income. Comparing each line as a share of revenue over time shows where profitability is strengthening or slipping.

Read the full guide

Reading the numbersWhat Are Retained Earnings? The Profit a Company Decides to KeepRetained earnings is the profit a company keeps and reinvests instead of paying out. What it really is, why it isn't a cash pile, and whether keeping it is good for you.7 min readReading the numbersWhat Is Earnings Per Share (EPS)? And Why a Rising One Can Still Fool YouEarnings per share is a company's profit divided by its shares. What EPS really is, basic vs diluted, and why a rising EPS can still mislead you.7 min readReading the numbersWhat Is a P/E Ratio? How to Tell If a Stock Is ExpensiveThe price-to-earnings (P/E) ratio is a stock's price divided by its earnings per share — its price in years of profit. What's 'normal', and how to read it.7 min read

Related terms

Accounts receivable (A/R)Money customers owe the company for goods or services already delivered but not yet paid.AccrualsAccounting entries that record revenue or expense before cash actually moves.Annual reportThe yearly disclosure that includes audited financials, MD&A, and footnotes — the primary source for serious investors.Balance sheetThe 'photo' statement — what the company owns, what it owes, and what's left for owners, on a single date.
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