What Is an Income Statement?
An income statement, also called the profit and loss statement (P&L), summarizes a company's financial performance over a specific period such as a quarter or a fiscal year. Unlike the balance sheet, which is a snapshot at a single moment, the income statement measures activity across a stretch of time.
It starts with revenue at the top and works down through costs and expenses until it arrives at net income at the bottom. That top-to-bottom flow is why revenue is nicknamed the top line and net income the bottom line.
How It Works
The statement follows a standard cascade: revenue minus cost of goods sold gives gross profit, gross profit minus operating expenses gives operating income, and operating income minus interest and taxes gives net income. Each subtotal isolates a different layer of profitability, from pure product economics down to what is left for shareholders.
Under accrual accounting, revenue and expenses are recorded when they are earned or incurred, not when cash actually changes hands. That means a profitable income statement does not guarantee healthy cash flow, which is why analysts read it alongside the cash flow statement.
Example
Suppose a company sells $1,000 of software subscriptions in a year. It spends $200 on hosting and support (COGS), leaving $800 of gross profit, then $500 on salaries, rent, and marketing, leaving $300 of operating income. After $50 of interest expense and $50 of taxes, net income is $200, meaning the company kept 20 cents of every revenue dollar.
Why It Matters
The income statement is the starting point for nearly every valuation and financial model, since metrics like EBITDA, EPS, and profit margins are all derived from it. Investors track it each quarter to judge growth, pricing power, and cost discipline.
It is also the anchor of the classic investment banking interview question, walk me through the three financial statements, which almost always begins with net income on the income statement flowing into the cash flow statement and balance sheet.
