Free Cash Flow
The cash a business produces after the spending required to keep producing it. It is what funds dividends, buybacks, debt repayment and acquisitions.
MadStockAlerts Research · Updated August 28, 2026
What to take away
- Free cash flow is operating cash flow minus capital expenditure.
- It is the input to a discounted cash flow valuation, which is why it matters so much.
- Maintenance and growth capital expenditure are not distinguished in the filing.
- It can be lumpy, so single quarters mislead and trailing twelve months is the usual window.
- A company returning more than it generates is funding the difference from somewhere.
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What Is Left for the Owners
Free cash flow is the cash a business generates after keeping itself running — the number dividends and buybacks actually come from.
This lesson is part of a Stock Alerts + Tools plan.
The calculation
free cash flow = cash from operations - capital expenditure
- both lines are taken directly from the cash flow statement
The logic is that a business must reinvest to stay in business, so cash which that reinvestment has already consumed was never available to shareholders in the first place.
It is a deliberately conservative measure. It charges the business for every dollar of capital spending, including the dollars spent building capacity that does not yet produce anything, which understates the free cash flow of a company in an expansion phase.
Maintenance versus growth
Capital expenditure covers two very different things: replacing what wears out, and building capacity that does not exist yet. A company spending heavily on the second is depressing its current free cash flow to raise its future one.
The filing does not split them. Analysts estimate maintenance spending from depreciation or from management commentary, and reasonable people arrive at different numbers. Any free cash flow figure that claims to isolate growth spending contains an estimate.
Using depreciation as the proxy for maintenance capital expenditure is the common shortcut and it is rough. Depreciation reflects the historical cost of assets bought years ago; replacing them costs today's prices, which in an inflationary period is materially more.
Why it is lumpy
A single large project, an inventory build ahead of a launch, or a change in payment terms can swing quarterly free cash flow dramatically. Trailing twelve months smooths the seasonality without smoothing away the trend.
For a genuinely capital-intensive business even a year can be too short. A company that builds a plant every five years has four good free cash flow years and one terrible one, and neither is representative on its own.
Scroll the chart sideways to see all of it.
What it funds
- Dividends, which are paid from it and are difficult to sustain without it.
- Buybacks, which reduce the share count and are usually discretionary.
- Debt repayment, which reduces the interest charge in future periods.
- Acquisitions funded without issuing stock or raising debt.
A company returning more to shareholders than it generates is funding the difference from the balance sheet or from capital markets, which is legible in the financing section of the cash flow statement. That is sustainable for a while and not indefinitely, and the balance sheet shows how long a while has been.
The definitions in circulation
Free cash flow is not defined by any accounting standard, which means it is not one number. Several constructions are in common use, and a comparison between two companies using different definitions is not a comparison.
| Construction | Formula | What it answers |
|---|---|---|
| Simple | Operating cash flow less capital expenditure | The most common, and the one most quoted |
| Levered | The above, after interest and debt repayment | What reaches equity holders |
| Unlevered | Operating cash flow before interest, less capex | What the business produces regardless of financing |
| Owner earnings | Adjusted toward maintenance capex only | A judgement, not a calculation |
The differences are not small. A heavily indebted company's simple and levered figures can differ by most of the total, and the unlevered figure is the only one comparable across companies financed differently.
Companies increasingly publish their own adjusted free cash flow, which may exclude items the standard constructions include. As with any non-GAAP measure, the definition is disclosed and it is the definition rather than the number that should be compared first.
What the number is used for
Free cash flow matters because it is the only measure that describes money genuinely available to be allocated. Profit can be reinvested involuntarily, in receivables and inventory that the business needs to hold; free cash flow is what is left after that.
- Dividends are paid from it, and a dividend consistently exceeding it is being funded by debt or by asset sales.
- Buybacks are funded from it, with the same caveat and less visibility, since a buyback carries no commitment to continue.
- Debt repayment reduces the claim on future free cash flow, which is why leverage and free cash flow are read together.
- Acquisitions are usually funded from a combination, and a serial acquirer's free cash flow before acquisitions is the relevant figure.
Free cash flow yield, free cash flow divided by market capitalisation, is the valuation measure built directly on this. It is harder to manipulate than an earnings yield because cash is harder to manipulate than accruals, and it is noisier because capital spending is lumpy.
A company covering its dividend from free cash flow every year through a cycle is in a materially different position from one covering it in good years only, and the distinction is invisible in a payout ratio computed from earnings.