Apple (AAPL) generated roughly $110 billion of free cash flow last fiscal year — more than the combined net income of Meta (META), Netflix (NFLX), and Nike (NKE) — and Buffett doesn't care about accounting profit, only about that number.
Free cash flow (FCF) is the metric that separates businesses that actually produce cash from businesses that just report good earnings. The catch is that roughly 90% of retail investors never look at it. This guide fixes that.
What Is Free Cash Flow, Really?
Free cash flow is the cash a company has left after it pays every bill required to keep the business running, including capital expenditures. The formula most investors use is:
FCF = Cash From Operations − Capital Expenditures
Cash from operations comes straight off the cash flow statement — it is net income plus non-cash adjustments (depreciation, stock-based comp, working capital changes). Capital expenditures is the line labeled "Purchases of property, plant, and equipment" — the money spent on factories, servers, trucks, etc.
Why not just use net income? Because net income is full of accounting noise — non-cash charges, timing differences, aggressive revenue recognition. A company can technically be profitable on paper and still burn through its cash reserves. FCF closes that loophole.
Buffett says it more bluntly: "Earnings can be pliable as putty when a charlatan heads the company that reports them. Cash is a fact."
How Do You Calculate FCF From a 10-K?
Flip directly to the cash flow statement. Find the section titled "Cash flow from operating activities" and take the total at the bottom. Find the first line in "Cash flow from investing activities" that says something like "Purchases of property and equipment" — that is capex. Subtract capex from operating cash flow.
That is the basic version. The more rigorous version — Buffett's "owner earnings" — separates maintenance capex (what you need to spend to keep the current business running) from growth capex (what you spend to expand). Companies don't disclose this split, so you have to estimate it.
| Company |
Op Cash Flow |
Capex |
Free Cash Flow |
FCF Margin |
| Apple (AAPL) |
$118B |
$8B |
$110B |
~28% |
| Microsoft (MSFT) |
$135B |
$55B |
$80B |
~33% |
| Alphabet (GOOGL) |
$125B |
$50B |
$75B |
~22% |
| Meta (META) |
$95B |
$40B |
$55B |
~34% |
| Amazon (AMZN) |
$115B |
$80B |
$35B |
~6% |
Notice Amazon (AMZN)'s FCF margin sits at roughly 6% — dramatically lower than the other big-tech names — because of heavy AWS data-center capex. That is not bad per se, but it is a completely different financial profile that demands a different valuation lens.
Why Does Warren Buffett Care About FCF More Than EPS?
Because cash is real and earnings are an opinion. EPS gets distorted by accounting choices — depreciation schedules, amortization of intangibles, inventory methods, restructuring charges. FCF ignores all of that and just asks one question: how much cash did the bank account actually grow?
Buffett's "owner earnings" concept, introduced in his 1986 Berkshire letter, is essentially:
Owner Earnings = Reported Earnings + D&A + Other non-cash charges − Required Capex − Working Capital Needs
That is FCF with extra caveats. He argues this is the number a rational private buyer would pay a multiple of — and by extension, the number a stock market investor should focus on.
When Buffett bought Coca-Cola (KO) in 1988, the reported P/E looked rich. But on an owner-earnings basis, the yield was closer to 7% — and growing roughly 10% annually. That was the real trade.
Is High FCF Always a Buy Signal?
No. A company with high FCF that is shrinking year over year is usually a value trap. Tobacco names like Altria (MO) and Philip Morris (PM) produce enormous FCF but have been in slow revenue decline for over a decade — the FCF level masks a long-term problem.
Three checks to run before treating high FCF as bullish:
- Is FCF growing or shrinking? Growth matters more than absolute level.
- What is the FCF margin doing? Margin expansion is a much stronger signal than a flat margin with revenue growth.
- Is capex being artificially suppressed? Some management teams cut capex to goose FCF short-term — and destroy long-term earnings power.
The companies that pass all three checks — compounding FCF, expanding FCF margin, and adequate capex — are the ones Buffett calls "economic franchises". Microsoft, Alphabet (GOOGL), and Costco (COST) are textbook examples in 2026.
What Is Free Cash Flow Yield and How Do You Use It?
Free Cash Flow Yield = Free Cash Flow ÷ Enterprise Value. It's the single most useful valuation metric built on top of FCF.
Think of it as the "bond coupon" of a stock. If a company has an FCF yield of roughly 6%, it means you're getting $6 of cash per $100 of enterprise value every year — before any growth. Compare that to the 10-year Treasury (currently around 4.3%) and you can tell instantly whether a stock is cheap on a cash basis.
Rough benchmarks for 2026:
- Above ~7% FCF yield: typically value territory (deep-value compounders, tobacco, some energy)
- Roughly 4–7% FCF yield: fair value for mature compounders
- Under ~3% FCF yield: growth territory (requires strong growth to justify)
Apple currently trades around a 3.5% FCF yield — implying the market is still pricing in solid growth. Meta (META) trades around 4.5%, slightly cheaper on FCF terms despite a higher recent growth rate.
For a broader framework on how FCF connects to DCF valuation, see our guide to fundamental analysis. To see how Buffett uses FCF and owner earnings in actual stock picks, start with our super-investors series.
How Does FCF Catch Red Flags That EPS Misses?
By exposing when reported profits stop turning into cash. There are three classic red flags:
Red flag 1: Rising EPS, shrinking FCF. This usually means aggressive accounting or bloating working capital. Receivables growing faster than revenue is the tell — customers aren't actually paying.
Red flag 2: FCF negative while EPS positive. Early-stage growth companies can sometimes justify this, but mature businesses almost never can. General Electric (GE) in the 2010s was a textbook case — GAAP earnings looked fine while FCF collapsed, and the stock eventually cratered.
Red flag 3: Capex being slashed to improve headline FCF. Look at the capex-to-D&A ratio. If capex suddenly drops below depreciation, management may be harvesting the business for short-term cash at the expense of future earnings power.
When Does FCF Mislead?
Three situations:
Heavy investment phases. Companies in a land-grab phase deliberately run negative FCF because every marginal dollar of capex funds future revenue. Amazon (AMZN) did this for roughly two decades. Judge them on unit economics and return on invested capital instead.
Financial companies. Banks and insurers have no meaningful "capex". Use return on equity and net interest margin.
Commodity cycles. Oil and gas names produce huge FCF at peak prices and none at the trough. Always average FCF across a full cycle — at least 5 years — for Exxon (XOM), Chevron (CVX), and peers.
Lumpy capex. A one-off factory build can crater a single year's FCF without changing the long-run story. Always normalize by averaging 3–5 years of capex before computing FCF margin.
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