Profit is the number most headlines lead with, but many experienced investors look first at something else: cash. A company can report healthy profits and still struggle to pay its bills, while another can look unexciting on paper and generate plenty of spare cash every year. Free cash flow is the measure that helps tell the difference, and it is one of the most useful ideas a beginner can learn when looking at shares.
The basic idea
Free cash flow is the cash a business generates from its normal operations after paying for the investment it needs to keep running and growing. That investment is called capital expenditure, or capex, and covers things like new equipment, factories, software and vehicles.
The simplest version of the calculation is straightforward. Take the cash the business generated from its operations, then subtract capital expenditure. What remains is free cash flow, money the company can use for dividends, share buybacks, paying down debt or making acquisitions.
Why profit and cash are not the same
Accounting profit includes items that do not involve cash changing hands at that moment. Depreciation, for example, spreads the cost of an asset over several years, reducing profit each year even though the cash was spent upfront. Sales made on credit count as revenue before the customer has actually paid.
That means a company can show rising profits while its cash is being drained by unpaid invoices, growing stock levels or heavy investment. The reverse can happen too. This is why many analysts treat free cash flow as a reality check on reported earnings. Our guide to earnings per share explains the profit side of the story.
What free cash flow is used for
When a company generates strong free cash flow, it has choices. It can return money to shareholders through dividends or share buybacks, reduce its debt, invest in new projects or buy other businesses.
This link to shareholder returns matters. A dividend that is comfortably covered by free cash flow looks more secure than one paid out of borrowed money. If you have read our explainer on dividend yield, free cash flow is one of the best ways to judge whether a high yield is sustainable or a warning sign.
Free cash flow yield
Some investors express free cash flow as a percentage of the company’s market value, known as free cash flow yield. It works a bit like a dividend yield, but measures all the spare cash the business produces rather than only what it chooses to pay out. A higher figure can suggest a company is cheap relative to the cash it generates, although it can also reflect concerns about whether that cash will last.
Why it can mislead
Free cash flow is not perfect. A company can boost it in the short term by cutting investment, which might hurt its future. It can also swing sharply from year to year, especially in businesses with lumpy investment cycles, such as energy companies, miners and telecoms groups. Comparing one year in isolation can give a distorted picture.
Different companies also define it slightly differently in their reports, so it pays to check how a figure has been calculated before comparing businesses.
Negative free cash flow is not automatically bad, either. A young, fast-growing company may be investing heavily for the future. The question is whether that investment is likely to pay off and whether the company can fund it without running into trouble.
Why traders care
Free cash flow helps explain why some share prices react strongly to results even when profits meet expectations. If cash generation disappoints, investors may worry about dividends, debt or the need to raise money. When borrowing costs are high, as they have been this year, companies that fund themselves from their own cash tend to be viewed more favourably than those that rely on borrowing.
The takeaway
Free cash flow tells you how much real money a business produces after it has paid for its own upkeep. Read alongside profit, it gives a clearer view of a company’s health and its ability to reward shareholders.
If you want to build your understanding of how company results move share prices, our free trader assessment shows where your knowledge stands and what to learn next.
