Reported profit can be shaped by accounting choices. Free cash flow is harder to massage — it's the actual cash a company has left after paying to run and maintain the business.
What free cash flow is
Free cash flow (FCF) starts from the cash a company generates from its everyday operations, then subtracts capital expenditure (capex) — the money it must spend on equipment, property and technology just to keep going.
Free cash flow = Operating cash flow − Capital expenditure
Why it differs from profit
Accounting profit includes non-cash items (like depreciation) and timing rules about when a sale counts. Cash flow tracks money actually moving in and out, so it's much harder to flatter. That's why investors often trust FCF more than the headline earnings figure.
Example: a company reports $100m of operating cash flow and spends $40m on new equipment. Its free cash flow is $60m — the cash genuinely available for dividends, buybacks, paying down debt, or acquisitions.
Two quick checks
| Measure | Formula | Tells you |
|---|---|---|
| FCF margin | Free cash flow ÷ Revenue | How much of every sales dollar becomes spendable cash. |
| P/FCF | Market cap ÷ Free cash flow | How many years of cash flow you're paying for the company. |
Compare P/FCF with the P/E ratio. If P/E looks low but P/FCF looks high, the reported profit may not be turning into real cash — a yellow flag worth investigating.
What good looks like
A high, stable FCF margin gives management choices: it can reward shareholders, reinvest, or pay down debt without borrowing. A business whose profit never becomes cash is on a treadmill — constantly spending just to stand still.
Red flag: if net profit looks healthy year after year but free cash flow stays low or negative, find out why. Heavy capex for genuine growth can be fine; profit that simply never shows up as cash is not.
