What Is Free Cash Flow?

Oct 13

Free cash flow is the cash a business has left after paying for its day-to-day operations and for the investment needed to keep and grow its assets. It is money the company could return to shareholders, use to pay down debt or put toward acquisitions without borrowing. Many investors trust it more than reported profit, because cash is harder to dress up than earnings.

Why free cash flow matters

A company's net income is an accounting figure. It includes items that never touch the bank account, such as depreciation (the gradual write-down of equipment and buildings as they age), and it records a sale when it is made rather than when the customer pays. Two companies can report the same profit while one is piling up cash and the other is quietly running short.

Free cash flow cuts through that noise. It asks a narrower question: after everything the business needed to spend, how much actual cash came in? That cash is what ultimately funds dividends, share buybacks and debt repayment, and it is the starting point for a discounted cash flow valuation.

How free cash flow is calculated

In words: take the cash the business generated from its normal operations, then subtract what it spent on long-term assets such as factories, machinery, software and equipment. That spending is called capital expenditure, or capex.

In symbols:

Free cash flow = Operating cash flow − Capital expenditure

Both figures come straight from the cash flow statement, one of the three main financial statements every listed company publishes. Operating cash flow already adjusts net income for non-cash items and for changes in working capital, which is the money tied up in inventory and in bills customers haven't paid yet.

A worked example

The numbers below are invented for illustration.

Say a company reports:

Net income: $80 million
Operating cash flow: $120 million
Capital expenditure: $30 million

Free cash flow is $120 million minus $30 million, or $90 million. That is higher than net income, which usually means non-cash charges such as depreciation were large and the business didn't need to reinvest much to keep running.

Now picture a second company with the same $80 million of net income, but operating cash flow of $70 million and capex of $65 million. Its free cash flow is just $5 million. On the income statement the two look identical. In the bank account they are very different businesses.

What good free cash flow looks like

There is no single good figure, because the absolute number depends on the size of the company. Three comparisons are more useful.

Free cash flow against net income. Over several years, a healthy business tends to turn most of its profit into free cash. Converting roughly 80% or more is a common rule of thumb, and persistently low conversion is worth investigating.
Free cash flow margin. This is free cash flow divided by revenue. Asset-light businesses such as software or payment networks can run margins above 20%. Retailers, airlines and manufacturers often sit in single digits, because they have to keep spending on stores, planes or plants.
The trend. Steady growth over five or ten years says more than any single year.

The sector matters a great deal here. Comparing a software company's free cash flow margin with a utility's tells you about their industries, not about which is the better investment.

What free cash flow doesn't tell you

Free cash flow is one of the more honest numbers in a set of accounts, but it has blind spots.

One year is noise. A company that delays a big equipment purchase will show a jump in free cash flow that year, then a drop when the bill arrives. A single strong year can simply be postponed spending, which is why an average over several years is more reliable.
Low free cash flow isn't always bad. A young company investing heavily in growth may show weak or even negative free cash flow because capex is high. If that spending earns good returns later, the low number was a sign of opportunity rather than trouble.
It doesn't separate maintenance from growth. Capex lumps together spending to keep the business standing still and spending to expand it. The standard formula can't tell you which is which.
Stock-based pay is hidden. When employees are paid in shares instead of cash, the cost doesn't reduce free cash flow, but shareholders still bear it through dilution. At companies that pay heavily in stock, free cash flow can look healthier than the economics really are.
It works badly for banks and insurers. For these businesses, lending and investing customers' money is the operation itself, so their cash flow statements don't fit the formula above. Free cash flow tells you little about them; book value and return on equity are the more common lenses.

How to use free cash flow

Treat free cash flow as a check on the story the income statement tells, not as a verdict on its own. A few practical habits help.

Look at several years. A multi-year average smooths out lumpy spending. Every company dashboard in the SIA stock screener shows a five-year average of free cash flow next to its growth rate for exactly this reason.
Compare it with net income. If profit keeps rising but free cash flow doesn't follow, find out why before trusting the earnings.
Ask where the cash goes. Free cash flow spent on sensibly priced buybacks, steady dividends or paying down debt is very different from cash spent on expensive acquisitions.
Use it in valuation. Free cash flow is the raw material for a discounted cash flow model, which estimates what a business is worth from the cash it can produce in the future.

High free cash flow on its own is not a reason to buy, just as low free cash flow is not a reason to sell. It is one piece of evidence that should agree with the rest.

Frequently asked questions

Can free cash flow be negative?

Yes. It turns negative when capital expenditure is larger than operating cash flow. That can signal a struggling business, or a healthy one investing heavily ahead of growth. The context decides which.

Is free cash flow the same as profit?

No. Profit, or net income, follows accounting rules that include non-cash items and record revenue when it is earned. Free cash flow tracks the cash that actually came in and went out.