Free Cash Flow (FCF)

Reviewed 12 August 2026 · Sourced from the SEC's non-GAAP staff guidance, Regulation G, Item 10(e) of Regulation S-K, the FASB's statement of cash flows standard, and named analysts on both sides of the stock-compensation argument

What the number is, and the fact that outranks the formula

You look up the same company on two sites at the same minute. One reports free cash flow of $38 million. The other reports $24 million. A third page, quoting the company's own earnings release, says $61 million. Nobody has made an arithmetic error and nobody is lying.

That cannot happen with revenue. It cannot happen with net income. It happens constantly with free cash flow, because of the single most important fact about the measure — and almost no page leads with it.

That is not this page's inference. The SEC's own staff guidance on non-GAAP financial measures takes up free cash flow directly, at Question 102.07, and says of it: “this measure does not have a uniform definition and its title does not describe how it is calculated.” The regulator, in writing, about the number your screener prints in a column.

What exists instead of a definition is a convention — one formula used so widely that it functions as a definition, and the one this site uses in the nine-metric reference on Markets · Fundamental.

The SEC's guidance describes that same construction as what free cash flow is “typically calculated as.” Typically is the careful word, and it is the regulator's word, not a hedge added here. Not always, and not by rule.

So reading a free cash flow figure honestly takes two steps, in this order. First: whose formula is this? Second, and only then: what does it say? A page that skips the first step is doing arithmetic on a number it has not identified.

Where the two numbers come from

Free cash flow has no official definition. Its two inputs do, and that is the entire reason the convention is defensible rather than arbitrary.

The statement of cash flows

Every US filer publishes one. The FASB standard that governs it — Accounting Standards Codification Topic 230 — requires cash receipts and payments to be sorted into three sections: operating, investing and financing. And under Regulation S-X, a registrant files audited statements of cash flows for each of the three fiscal years preceding its most recent audited balance sheet. One 10-K therefore hands you three years of both inputs, which matters more on this measure than on most.

Input one: net cash provided by operating activities

The bottom line of the first section, a GAAP subtotal with a standard label. Most companies build it by the indirect method: start at net income, add back the expenses that reduced profit without moving cash — depreciation, amortization, stock-based compensation, impairments — then adjust for changes in working capital, meaning receivables, payables and inventory.

Input two: capital expenditures

Capex is not a single labeled line in the codification. It is the investing-section outflow ASC 230 describes as “payments at the time of purchase or soon before or after purchase to acquire property, plant, and equipment and other productive assets, including interest capitalized as part of the cost of those assets.” On an actual filing it reads Purchases of property, plant and equipment or Additions to property and equipment, as a negative number.

What the SEC requires when a company publishes it

“Non-GAAP” does not mean unregulated. It means the number is not produced by the accounting rules, so a different set of rules governs how it may be shown to you.

Item 10(e)(2) of Regulation S-K defines a non-GAAP financial measure as one that “excludes amounts, or is subject to adjustments that have the effect of excluding amounts, that are included in the most directly comparable measure” calculated under GAAP. Free cash flow subtracts capital expenditures from a GAAP cash flow subtotal, so it sits squarely inside that definition.

Two provisions then apply. Regulation G (17 CFR § 244.100) covers any public disclosure — earnings release, conference call, investor deck. Item 10(e) of Regulation S-K (17 CFR § 229.10(e)) covers documents filed with the Commission. Between them they require:

• The comparable GAAP measure, with equal or greater prominence. A company cannot headline free cash flow and bury operating cash flow in a footnote.
• A quantitative reconciliation — Regulation G requires “a reconciliation (by schedule or other clearly understandable method)” of the differences between the two. This is the paragraph that lets you rebuild the company's figure and see exactly what it did.
• A statement of why management believes the measure is useful to investors.
• Nothing misleading. Regulation G prohibits a non-GAAP measure that “contains an untrue statement of a material fact or omits to state a material fact necessary in order to make the presentation of the non-GAAP financial measure, in light of the circumstances under which it is presented, not misleading.”

The staff guidance adds two limits specific to this measure. First, a company must not use free cash flow in a way that “inappropriately implies that the measure represents the residual cash flow available for discretionary expenditures, since many companies have mandatory debt service requirements or other non-discretionary expenditures that are not deducted from the measure.” Free cash flow is not spending money. Interest and required principal payments can still be ahead of it.

Second, and this one surprises people: free cash flow is a liquidity measure and must not be presented on a per share basis in documents filed or furnished with the Commission. Non-GAAP earnings per share is permitted, because the SEC treats it as a performance measure. Cash per share is not. If you see “free cash flow per share,” it did not come out of a filing.

The capex judgment call, in numbers

This is where free cash flow stops being arithmetic and becomes a judgment, and it is the most useful thing on this page.

Capital spending does two different jobs. Some of it replaces what wears out: the truck at 400,000 miles, the roof, the failed server. Call that maintenance capex — the cost of staying in business, as unavoidable as payroll. The rest expands: the second plant, the new region, the extra line. Growth capex, optional spending on being bigger later. Economically they are opposites.

Companies do not split them. The investing section shows one number, nothing in ASC 230 requires a breakdown, and no filer volunteers a reliable one — partly because the line between replacing a machine and upgrading it is genuinely blurry.

So the conventional formula subtracts all of it, which carries a consequence rarely stated plainly: subtracting all capex understates the cash the business could produce if it stopped growing, and subtracting none of it overstates what the business can actually hand out. Both are wrong in a known direction and there is no clean place to land between them. The best-known attempt is “owner earnings,” set out by Warren Buffett in an appendix to Berkshire Hathaway's 1986 annual report, which subtracts only the capitalized spending a business needs to hold its competitive position — and therefore requires estimating a figure no company reports. Analysts disagree here, and this page will not pretend otherwise.

Negative free cash flow while the business is working

That is the ordinary shape of a growing capital-intensive business, and most writing on this term implies negative free cash flow is a warning by itself. It is not a warning, it is a question: what did the money buy, and is the return visible yet? Plants that fill and plants that sit empty print the same figure in year one.

Positive free cash flow from not investing

Capex running persistently below depreciation is a widely used flag for exactly this, and it is a convention rather than a rule — legitimately normal for a business shrinking on purpose, or one that has shifted from owning assets to renting them. The reason to read free cash flow across three years instead of one, the guidance printed beside it on Markets · Fundamental, is that a deferral shows up as a spike in one year and a hole in the next.

Harder to fake than profit, and not impossible

The instinct that sends people to cash flow is sound. Net income is assembled from estimates and timing choices: when revenue is recognized, how long an asset is depreciated over, what a receivable is worth, whether a cost belongs to this year or is spread over five. A great deal of legitimate judgment lives inside it, which necessarily leaves room for illegitimate judgment. That is the earnings-quality problem, and it is why the price-to-earnings ratio rests on a denominator management has latitude over in a way a share price is not.

Cash is different in kind. The money arrived or it did not. But the timing of arrival is movable, and free cash flow is measured over a period with two ends. The mechanics, plainly:

• Stretch payables. Pay suppliers on day 75 instead of day 45. Cash that would have left in December leaves in January instead. Operating cash flow rises this period and falls next, and the business is the same business.
• Squeeze receivables. Discount for early payment, or push collections hard through the last two weeks of the quarter. The same cash, pulled forward.
• Factor receivables. Sell the invoices to a finance company at a discount and collect now. Depending on how the arrangement is structured, that can convert future operating cash into current operating cash — and the discount is a real cost that never appears looking like one.
• Draw down inventory. Stop restocking. Cash builds because you are selling what you already own without replacing it. Unsustainable by construction.
• Defer maintenance capex. The lever from the previous section, and the cleanest, because capex is subtracted after operating cash flow is already reported. Nothing in the statement flags it.
• Capitalize rather than expense. This one moves the boundary itself: treat a cost as an asset and it leaves the operating section, reappearing in investing as capex. Operating cash flow rises and reported profit rises — and free cash flow, which subtracts capex, is the one measure not flattered by the switch. That is a genuine structural strength, and much of why free cash flow is the harder number to dress up.

Notice the pattern. Every lever but the last is a timing shift, not an invention, and timing shifts reverse. A strong year built on payables and inventory arrives with a weak year immediately behind it. Three years of statements defeat nearly all of it, which is the practical argument for reading it that way rather than a stylistic preference.

The stock-based compensation argument

This is the live dispute about free cash flow, and it bites hardest at exactly the companies whose free cash flow gets quoted most.

Start with what is settled. A company that pays employees in shares must record it as an expense: the SEC's staff accounting guidance on share-based payment describes the requirement that “compensation cost resulting from share-based payment transactions be recognized in financial statements at fair value,” under the FASB's stock compensation standard. It reduces net income like any other pay.

Now the mechanics. It is not cash — the company handed over shares, not dollars — so on an indirect-method cash flow statement it is added straight back. Michael Mauboussin and Dan Callahan, writing for Morgan Stanley's Counterpoint Global in April 2023, state the consequence flatly: “Cash flow from operating activities does not reflect SBC as an expense.” Neither, then, does free cash flow.

The case for leaving the add-back alone: free cash flow is a cash measure, and no cash left the building. Counting a non-cash item as a cash outflow makes it a different measure than the one it claims to be, and the cost to shareholders is dilution, which belongs in the share count rather than in the cash flow.

The case for subtracting it: the company obtained labor and paid for it with something valuable. Aswath Damodaran of NYU Stern, in “Earnings, Cash Flows and Free Cash Flows: A Primer” (October 2022), calls free cash flow “one of the most dangerous terms in finance” and rejects the add-back, on the grounds that a company can neither stop paying its people nor issue equity for free. Mauboussin and Callahan recommend treating it first as an expense reducing operating cash flow and second as equity raised, so the claim on the business is visible somewhere.

Both sides agree on the substance and differ on the bookkeeping: the cost is real, and it lands on existing shareholders through the share count. Every share issued to an employee makes each existing share a slightly smaller claim — see market capitalization for why the basic and diluted counts differ and by how much. And a company that buys back shares to hold the count flat spent cash to do it, out of the same free cash flow.

Against its neighbors, and against other versions of itself

Free cash flow only means something beside the measures it is not. Cardinal Tool Works' base year again, with two more figures from its income statement: interest expense $11,000,000 and income tax expense $16,000,000.

EBITDA is non-GAAP too, and it is the one non-GAAP measure the SEC names by hand: Item 10(e)(1)(ii) carves out “the measures earnings before interest and taxes (EBIT) and earnings before interest, taxes, depreciation, and amortization (EBITDA)” from a prohibition that otherwise applies to liquidity measures. The $79 million gap between Cardinal's $117 million of EBITDA and its $38 million of free cash flow is its capital intensity, its working capital, its interest and its taxes — which is the reason capital-heavy businesses like EBITDA.

A loss with positive free cash flow

Both mismatches are ordinary. Profit and cash answer different questions, and the accounting deliberately lets them diverge.

Levered, unlevered, and yield

Three variants worth recognizing on sight, none of them GAAP, all of them conventions:

• Unlevered free cash flow, or free cash flow to the firm — built before any interest or debt payment, so it describes the operating business regardless of who financed it.
• Levered free cash flow, or free cash flow to equity — after interest and required principal repayment. Closer to what is genuinely left for shareholders, and it moves when borrowing costs move, which ties it to the interest rate environment in a way the unlevered version is built to avoid.
• The detail almost nobody mentions: the plain “operating cash flow minus capex” version is already partly levered, because under US accounting rules cash interest paid runs through the operating section. It is neither cleanly levered nor cleanly unlevered.

And because a dollar figure cannot be compared across a large company and a small one, the comparison form is free cash flow yield.

It reads like the inverse of a valuation multiple, and it is directly comparable to a dividend yield — with one difference that matters. A dividend yield is what shareholders were actually paid. A free cash flow yield is what was available before management decided what to do with it. There is no level at which a free cash flow yield becomes good. Anyone quoting a threshold is quoting a convention, and usually not saying so.

What is sourced here and what is not

Three kinds of claim appear above, and the difference between them matters more than the content.

What trips people up

• Comparing two free cash flow figures without checking the formulas. The whole page in one line. There is no uniform definition, so two numbers for one company are normal, not evidence one source is wrong.
• Reading negative free cash flow as a warning by itself. It is the ordinary signature of a business converting cash into capacity. The question is what the spending bought, not the sign in front of the number.
• Reading a big positive number as strength. Cutting capex to well under depreciation produces a strong year and a weak one behind it. Above, that lever alone doubled free cash flow.
• Treating it as discretionary cash. The SEC's own guidance warns against exactly this, because debt service and other required payments are not deducted from it.
• Reading one year. Nearly every timing lever — payables, receivables, inventory, deferred maintenance — reverses within a year or two. Three years arrive in the same 10-K.
• Ignoring stock compensation at a company that pays heavily in stock. The add-back is not an error, but leaving it unexamined is. It was worth 37% of free cash flow in the example.
• Trusting “free cash flow per share.” It cannot appear in an SEC filing; free cash flow is a liquidity measure and the prohibition is explicit.
• Assuming a cash number cannot be gamed. Harder than earnings, yes. Impossible, no — and fraud is not on the list of ordinary levers at all.
• Skipping the reconciliation. It is required, it is in the filing, and it is the only way to know which measure you are holding.
• Treating a free cash flow yield as a verdict. No authority sets a level at which one becomes attractive, and a low yield at a company investing heavily means something different than a low yield at one that is not.

The figures on this page are checked against the source that publishes them, and dated. Published rates move after the release named above — the linked source always carries the current number. This page explains a term; it does not recommend a product.