CluenexWhat is free cash flow?
Free cash flow (FCF) is the cash a company generates from operations after it pays for the equipment, buildings and software it needs to keep going and grow. It is the money left over that could go to dividends, buybacks, debt repayment or new projects.
Net income is an accounting number. It includes non-cash items such as depreciation and counts sales when they are earned, not when cash arrives. Free cash flow tracks actual cash, which is why many investors check it next to profit.
How do you calculate free cash flow?
The standard formula is: FCF = cash flow from operations minus capital expenditures (capex, money spent on long-lived assets). Both lines appear on the cash flow statement in a company's 10-K or 10-Q filing. For more on reading that filing, see what is inside a 10-K.
Capex sits under investing activities, not operating activities, so it is not already subtracted in operating cash flow.
Worked example with made-up numbers:
- Cash flow from operations: $800 million
- Capital expenditures: $300 million
- Free cash flow: $800M minus $300M = $500 million
If the company's market capitalization (share price times shares outstanding) is $10 billion, FCF yield = $500M divided by $10B = 5.0%.
Some sites use a longer form: net income plus depreciation and amortization, minus the change in working capital, minus capex. It lands near the same answer, but starting from the cash flow statement is simpler and less error-prone.
Why can free cash flow tell you more than net income?
FCF is harder to flatter with accounting choices, because it counts cash that actually moved. Net income can look healthy while cash is stuck in unpaid customer bills or unsold inventory.
| Measure | What it captures | Main blind spot |
|---|---|---|
| Net income | Accounting profit after all expenses | Includes non-cash items and timing of revenue |
| EBITDA | Earnings before interest, taxes, depreciation and amortization | Ignores capex entirely |
| Free cash flow | Cash after capital spending | Can swing from one big purchase or working capital change |
For the details on EBITDA, see what EBITDA is and why analysts use it.
What is FCF yield and what is a good one?
FCF yield is free cash flow divided by market capitalization, shown as a percentage. It tells you how much cash the business produced for each dollar the whole company is priced at.
There is no official threshold for a good yield. A higher yield means more cash per dollar paid, but it can also mean the market expects cash flow to fall. A low yield can be fine for a fast-growing company whose cash flow is expected to rise.
The useful comparisons are against the company's own history, its direct rivals and the broader market. A yield of 5% in a slow, stable business means something different than 5% in a cyclical one whose cash flow peaks and crashes.
What does it mean when net income and FCF disagree?
A persistent gap is a prompt to investigate, not a verdict. Common causes of net income running well above FCF:
- Accounts receivable rising faster than sales: revenue is booked but customers have not paid.
- Inventory building up: cash is tied up in unsold goods.
- A capex surge: spending on new plants or data centers that has not yet produced revenue.
The opposite pattern, FCF above net income, often appears when large depreciation charges from past spending reduce reported profit but not cash. That is common in asset-heavy businesses. Check the notes in the filing to confirm the reason before drawing a conclusion.
Making this concrete with made-up quarters: if net income is $500M, $520M and $540M while FCF is $480M, $310M and $80M, profit is rising while cash is draining. The next step is to open the cash flow statement and see whether receivables, inventory or capex caused it.
When is negative free cash flow okay?
Negative FCF is acceptable when a company is spending heavily on growth that is likely to earn a good return, and it has the funding to last. Young companies, builders of factories or networks, and capital-intensive firms often run negative FCF for years.
The question is how the gap is paid for. Cash reserves, borrowing and selling new shares each carry costs. Check the balance sheet and debt levels alongside the cash flow statement.
Where does free cash flow fail?
FCF is useful, but it can mislead in several ways:
- One-year distortions. A delayed equipment purchase makes FCF look great for a year. Look at three to five years.
- Maintenance versus growth capex. Companies do not split these on the cash flow statement. Counting all capex against FCF understates a business that is mostly expanding, while ignoring it overstates one that is just keeping up.
- Stock-based compensation. Paying staff in shares does not use cash, so it boosts FCF. Check how many new shares are being issued, because that dilutes owners.
- Working capital swings. Delaying payments to suppliers can lift FCF temporarily and then reverse.
- Definitions differ. Data sites and companies may calculate FCF differently, so compare like with like.
- Dividends and buybacks. Standard FCF does not subtract them. For whether a payout is covered, see whether a dividend is funded by profit.
How does FCF relate to owner earnings?
Warren Buffett described owner earnings in his 1986 Berkshire Hathaway shareholder letter as reported earnings plus depreciation and similar charges, minus the average annual capital spending needed to maintain the business's position. It is similar to FCF but uses an estimate of maintenance capex rather than actual capex. That estimate takes judgment, so it cannot be pulled straight from a filing.
What this means for you
You can check this in a few minutes for any company you own.
- Open the latest 10-K and find cash flow from operations and capital expenditures. Subtract to get FCF.
- Compare FCF to net income for the past three to five years. Note any widening gap and look for the reason in the filing's management discussion.
- Compute FCF yield and compare it with the company's own history and close rivals, not a fixed cutoff.
- Check share count over time to see whether stock compensation is quietly diluting you.
- Treat FCF as one check among several. Pair it with debt, margins and business quality. Cluenex shows business quality scored 0 to 10 against a company's own industry on its free public stock pages at cluenex.com/stocks/, with every number explained beside it.
Nothing here is a recommendation about any security. It is a habit for reading the cash a business really produces.