What Is Cash Flow? How It Works and How to Analyze It

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Cash flow is the net amount of cash and cash equivalents moving into and out of a business over a set period, such as a fiscal quarter or a year. Money coming in is a cash inflow; money going out is a cash outflow. When inflows exceed outflows, net cash flow is positive and the company’s cash balance grows. When outflows exceed inflows, net cash flow is negative and the balance shrinks.

In accounting, cash flow is measured on a cash basis: it records money when it actually changes hands, not when a sale is booked or an expense is incurred. That makes it a measure of liquidity, the ability to pay bills on time, rather than a measure of profitability.

How Cash Flow Works

The Basic Formula

The simplest calculation is:

Net cash flow = Total cash inflows minus Total cash outflows

A cash inflow is any receipt of money: customer payments, interest earned, royalties, loan proceeds, money raised by selling shares or proceeds from selling old equipment. A cash outflow is any payment: wages, rent, supplier invoices, taxes, interest, loan repayments, dividends or equipment purchases.

Timing is what separates cash flow from other measures. If a company sells $50,000 of goods on 60-day credit terms, the sale counts as revenue immediately, but the cash inflow arrives only when the customer pays. Until then, the money sits in accounts receivable on the balance sheet.

The Three Types of Cash Flow

The cash flow statement sorts every cash movement into one of three sections.

Cash flow from operating activities (CFO). Also called operating cash flow (OCF) or net cash from operating activities, this covers the cash generated by the core business: selling goods and services, paying suppliers and staff, and paying taxes. It answers whether the business, on its own, brings in enough cash to cover its running costs. A company that relies on borrowing or asset sales to fund daily operations will show weak or negative CFO.

Cash flow from investing activities (CFI). This section records cash spent on, or received from, long-term assets and investments: property, plant and equipment, acquisitions of other businesses and securities. It is often negative for a growing company, because spending on new factories, technology or acquisitions is an outflow. A negative figure here is not, by itself, a warning sign.

Cash flow from financing activities (CFF). This covers transactions with the company’s owners and lenders: issuing or repurchasing shares, borrowing and repaying debt, and paying dividends. It shows how the business funds itself and how much cash it returns to capital providers.

The sum of the three sections equals the net increase or decrease in cash and cash equivalents for the period. That bottom line connects the opening and closing cash balances reported on the balance sheet.

Direct and Indirect Methods

Operating cash flow can be presented in two ways. The direct method lists actual cash receipts and payments, such as cash collected from customers and cash paid to suppliers. The indirect method, which most companies use in practice, starts with net income from the income statement and adjusts it:

1. Add back non-cash charges such as depreciation and amortization.
2. Adjust for changes in working capital: an increase in a current asset like receivables or inventory reduces cash flow, while an increase in a current liability like accounts payable increases it.
3. Remove gains or losses from investing activities, which belong in the investing section.

Both methods arrive at the same operating cash flow figure. The indirect method has the advantage of showing exactly why net income and operating cash differ.

Example of Cash Flow

The following is a hypothetical example for an illustrative company, “Example Manufacturing Co.,” for one fiscal year.

If the company started the year with $600,000 in cash, it ends the year with $740,000.

Several points stand out. Depreciation reduced net income but involved no cash payment, so it is added back. Receivables rose by $150,000: customers bought more on credit than they paid off, so that much of the year’s revenue had not yet arrived as cash. Inventory growth tied up another $80,000. Delaying payment to suppliers, shown as the rise in payables, freed $60,000. The result is operating cash flow of $450,000, lower than the $500,000 profit.

The company then spent heavily on equipment and paid dividends, partly funded by new borrowing. Its free cash flow, operating cash flow minus capital expenditures, is $450,000 minus $300,000, or $150,000. (This uses gross equipment purchases as capital expenditures; some analysts net out the $40,000 from the asset sale.)

Interpreting Cash Flow

Reading the Pattern Across Sections

The signs of the three sections, read together, describe what stage a company is in and how it is managed:

• Positive operating, negative investing, negative financing: the business generates cash, reinvests in itself and pays down debt or rewards shareholders. This pattern is typical of a self-funding company.
• Negative operating, negative investing, positive financing: the company is spending to grow and relying on outside capital to do it. This is common for young firms, but it depends on continued access to lenders or investors.
• Positive operating, positive investing: the company is selling assets on top of its operating cash. That can mean a strategic divestment or a need to raise cash.

Outflows that exceed inflows display liquidity problems only when they persist. A single negative period caused by a large equipment purchase is different from operating cash flow that stays negative quarter after quarter, which forces the company to borrow, sell assets or issue shares to keep paying its bills.

Common Cash Flow Metrics

Analysts pair the cash flow statement with the other financial statements to calculate ratios such as these:

• Free cash flow (FCF): operating cash flow minus capital expenditures. It shows the cash left to pay dividends, buy back stock, repay debt or expand.
• Unlevered free cash flow (UFCF): free cash flow before interest payments, used to value a business independently of how it is financed.
• Cash flow-to-net income ratio: operating cash flow divided by net income. A ratio near 1 suggests reported earnings are backed by cash; a ratio well below 1 means profits are being absorbed by receivables, inventory or other accruals.
• Current liability coverage ratio: operating cash flow divided by current liabilities (often averaged over the period). It measures the ability to cover short-term obligations from operations.
• Price-to-cash flow ratio (P/CF): share price divided by operating cash flow per share. Because it ignores non-cash charges such as depreciation, P/CF can be useful for valuing companies that generate positive cash flow but report weak or negative earnings because of large non-cash expenses.

Why Cash Flow Matters

A business pays its employees, suppliers and lenders in cash, not in profit. Positive cash flow lets a company cover obligations, reinvest, return money to shareholders and hold a buffer against downturns, avoiding the costs of financial distress, such as emergency borrowing at high rates or forced asset sales.

In practice, cash flow is used for three main purposes:

1. Assessing liquidity: whether the company can pay bills and debts as they come due.
2. Judging earnings quality: whether reported profit is turning into actual cash.
3. Valuing the business: many valuation models discount expected future cash flows rather than earnings.

Cash Flow vs. Profit, Revenue and EBITDA

Revenue is the income earned from selling goods and services during the period, whether or not customers have paid yet. Cash flow counts only the money actually received and paid out.

Profit (net income) is revenue minus expenses under accrual accounting. Expenses include non-cash items such as depreciation, and revenue includes credit sales. That is why earnings do not automatically mean cash flow: a company can report rising profit while customers delay payment and inventory piles up, leaving less cash than the income statement suggests. The reverse also happens. A company with large depreciation charges may report a loss while generating healthy operating cash.

EBITDA adds back interest, taxes, depreciation and amortization to earnings and is sometimes used as a rough cash proxy. It does not account for changes in working capital, taxes actually paid or capital spending, so it can overstate the cash a business produces.

Limitations of Cash Flow

Cash flow figures are harder to distort than earnings, but they have weaknesses:

• Timing can be managed. A company can lift operating cash flow at period end by delaying supplier payments, selling receivables to a third party or cutting inventory. These moves may not be repeatable.
• It does not measure profitability. A company can produce cash by liquidating assets or borrowing while its underlying operations lose money. The section the cash comes from matters as much as the total.
• Classification varies. Under U.S. GAAP, interest paid is classified as an operating cash flow, while IFRS allows interest and dividends to be classified as operating or financing. Comparing companies reporting under different standards requires care.

FAQs

The Bottom Line

Investors, lenders and business owners use cash flow to judge whether a company can pay its bills and whether its reported profit is turning into actual cash. A single negative period from a large equipment purchase differs from operating cash flow that stays negative quarter after quarter. Readers should check which section the cash comes from, since borrowing or asset sales can mask weak operations.