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Income Statement, Balance Sheet, Cash Flow — what each measures
Every U.S. public company publishes three core financial statements every quarter (in its 10-Q) and every year (in its 10-K). The income statement, the balance sheet, and the cash flow statement together capture the entire economic picture of a business — what it sold, what it owns, what it owes, and what cash actually flowed through it. If you can read these three documents and connect what each is telling you, you can evaluate any company on earth. Most beginners can't, which is why most beginners overpay for businesses they don't understand.
Each of the three statements answers a different question, and each is misleading on its own. The answers 'how much did the company earn during this period?' The answers 'what does the company own and owe right now?' The answers 'where did the actual cash come from, and where did it go?' Profitable companies have gone bankrupt because they ran out of cash. Asset-rich companies have collapsed under hidden debt. Cash-generating companies have been mediocre investments because the cash kept flowing into bad acquisitions. You need the full triplet to see the business honestly.
Starts at the top with revenue (the total money customers paid for the company's products or services in the period). Subtracts the cost of producing those products (cost of goods sold) to get gross profit. Subtracts operating expenses (salaries, R&D, marketing) to get operating income. Subtracts interest expense and taxes to get net income — the bottom line. The income statement IS what people mean when they say 'profit' or 'earnings,' and it IS what gets reported in headlines. But it includes non-cash items (depreciation, stock-based compensation, impairments) and is governed by accrual accounting rules that can be aggressive or conservative. Net income alone is an incomplete read on what the business actually produced.
Frozen at a single moment (the last day of the quarter or year). Three sections. on top: cash, receivables, inventory, plant and equipment, intangibles. in the middle: accounts payable, debt, lease obligations. at the bottom: paid-in capital plus retained earnings minus treasury stock. The fundamental identity Assets = Liabilities + Equity must hold at every reporting date. Reading the balance sheet tells you about leverage (how much debt), liquidity (can short-term obligations be met), and capital structure (how the business is financed).
Three sections. (OCF) is cash from running the actual business. is cash for long-term assets — capex, acquisitions, asset sales. is cash from owners and lenders — share issuance/buybacks, dividends, borrowing/repayment. Cash is harder to fake than earnings — accountants can argue about when revenue is 'recognized,' but cash either is in the bank or it isn't. When a company's net income looks great but operating cash flow lags, the income is suspect. When operating cash flow steadily exceeds net income, the income is conservative and the business is healthier than the headline suggests.
Net income (from the income statement) flows into retained earnings (on the balance sheet) — increasing equity. Net income is also the starting point of the cash flow statement, which adjusts for non-cash items and working-capital changes to derive operating cash flow. Capital expenditures (from the cash flow statement) increase property, plant & equipment (on the balance sheet) and are depreciated over time on the income statement. Issuing debt (financing cash flow) increases cash AND debt on the balance sheet. The three statements are a closed system: every transaction touches at least one of them, often two or three, and they must reconcile. When fraud occurs, the three statements stop reconciling — and the cash flow statement is usually where it shows up first.
This is what the headline numbers look like for Apple's latest 10-K filing (FY2024, fiscal year ended September 28, 2024). Source: Apple FY2024 10-K, filed November 2024 with the SEC.
Every stock page on the platform has a Financial Statements tab that shows the three statements side-by-side, with 10-year history per line item. The Ratios tab cross-references metrics across all three statements (margins from the income statement, leverage from the balance sheet, cash conversion from the cash flow statement) to surface the patterns you can't see in any single statement alone. The Filings tab links directly to the company's 10-K and 10-Q on SEC EDGAR — the legal documents these statements come from.
The most common beginner mistake is reading only one statement. Net income looks great → buy. But operating cash flow is half of net income, and the gap is widening. Or: total assets are huge and growing → safe company. But half the assets are goodwill from overpriced acquisitions. Or: a company has $50B of cash → must be solid. But it also has $80B of debt and operating cash flow that can barely cover the interest. The three statements only tell the truth together. A company that looks good on all three is rare; a company that looks good on one is common; the gap between them is where most value-trap analysis lives.
You have to understand accounting. You have to. That's a language unto itself. It's like being a foreign correspondent without knowing the language. You have to be willing to read in a language called accounting if you want to evaluate businesses on your own.