Free cash flow is the cash left after a company pays its operating expenses and the capital spending needed to maintain and grow the business. It is operating cash flow minus capital expenditure. Unlike net income it is difficult to shape with accounting choices, which is why many investors treat it as the truest measure of earnings.
Why it beats net income
Net income is an opinion. Not a dishonest one necessarily, but a figure that depends on judgement about when revenue is earned, how long an asset lasts, how costs are allocated across periods, and what a provision should be. Reasonable accountants applying the same rules to the same company arrive at different profit figures.
Cash is a fact. It either arrived in the bank account or it did not. That difference is why a company can report rising profits for several years while quietly burning cash, and why the cash flow statement is usually where that shows up first. Free cash flow takes the least manipulable number on that statement and subtracts the spending required to stay in business.
How to calculate it
Both inputs sit on the cash flow statement. Operating cash flow is the subtotal at the end of the first section. Capital expenditure appears in the investing section, usually as "purchases of property, plant and equipment". Subtract the second from the first.
Worked example
A company reports $1,200M of cash from operations and spent $300M on property, plant and equipment. Net income for the same year was $700M.
Free cash flow = $1,200M − $300M = $900M
FCF conversion = $900M ÷ $700M = 1.29× net income
The business converts every dollar of reported profit into about $1.29 of spendable cash, which is healthy. Depreciation is a real expense but not a cash one, so well-run companies typically convert above 1.0.
What good looks like
The most useful test is conversion: free cash flow divided by net income, averaged over five years or more. Consistently above 1.0 suggests the reported profit is backed by cash. Consistently below 1.0 is worth understanding, and if the gap widens year after year it is one of the most reliable early warnings available to a public-market investor.
Growth matters as much as level. Free cash flow per share growing faster than revenue means the business is becoming more efficient at converting sales into owner's cash, which is the financial signature of a company that has stopped needing to buy its own growth.
The maintenance capex problem
Strictly, only maintenance capital expenditure should be subtracted. Money spent building a new factory that will produce profits for twenty years is not a cost of this year's earnings; it is an investment. Subtracting all capex therefore understates the free cash flow of a company in an expansion phase and can make a good business look expensive.
Companies almost never disclose the split, so most investors subtract everything and accept the conservatism. Two useful workarounds: compare capex to depreciation, since capex running well above depreciation usually signals growth spending rather than maintenance; and look at what free cash flow did in a year when the company was not expanding.
Where free cash flow gets flattered
- Stretching payables. Paying suppliers thirty days later lifts operating cash flow once, and the boost never repeats. Check whether working capital is the source of an improvement.
- Deferring necessary spending. Cutting maintenance capex raises free cash flow this year and creates a bill later. Persistent capex below depreciation is the tell.
- Stock-based compensation. It is added back as a non-cash expense, which is technically correct and economically misleading. It is a real cost, paid in your ownership rather than the company's cash. Check the share count alongside the cash figure.
- One-off receipts. Legal settlements, asset sales and tax refunds inflate a single year. Read five, not one.
What free cash flow is used for
Once a business generates more cash than it can reinvest at attractive returns, what management does with the surplus becomes the investment question. It can go into the business, into acquisitions, into paying down debt, into dividends, or into buybacks. Each choice reveals something. A company funding its dividend from borrowing rather than from free cash flow is telling you the payment depends on conditions not deteriorating.
Find out whether a company is even at the free-cash-flow stage
Free cash flow is the wrong question for a company still in hyper growth and the central question for one in capital return. Phase Check reads the financials, places any US-listed company on the lifecycle, and names the metric that actually matters where it sits.
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Frequently asked questions
Related
- How to read a cash flow statement, where both inputs come from, in five steps
- ROIC, how efficiently the capital behind that cash is deployed
- Is a dividend safe?, free cash flow coverage is the second of five checks
- Investing glossary, every term used above, defined in plain English