How to Tell If a Company Is Running Out of Cash (Before You Buy the Stock)

If you’re studying a company before investing in it, checking its profit is usually the first thing that comes to mind. It’s an easy habit to fall into, since profit gets the most attention in headlines and earnings reports.

But profit alone can be misleading.

A company can report strong, consistent profits and still be quietly running low on the one thing that actually keeps it operating: cash.

This isn’t a contradiction, and it’s one of the most common blind spots for investors evaluating a stock.

Profit is an accounting figure; it gets recorded the moment a sale is completed, regardless of when the company actually receives payment for it.

Cash flow, on the other hand, only counts money once it has physically moved into or out of the company’s bank account. A business can close a large, genuinely profitable deal and still not see that cash for weeks or months, while its own bills, payroll, rent, supplier invoices, and debt payments continue on a fixed schedule that doesn’t wait for that money to arrive.

That’s exactly why relying on profit alone when you’re researching a company can leave you with an incomplete, sometimes dangerously incomplete, picture. The number that actually tells you whether a company can keep functioning is its free cash flow.

By the end of this article, you’ll know exactly what that number means, why top investors check it before anything else, and how to look it up yourself the next time you’re deciding whether a stock is actually worth buying.

This also isn’t a rare or isolated risk. Research referenced in a deep-dive episode from the Corporate Finance Institute’s FinPod attributes roughly 82% of business failures to cash flow problems as a primary cause.

Notably, this isn’t limited to small or early-stage companies. Large, well-established businesses have collapsed for the same reason.

What Is Free Cash Flow, and How Do You Calculate It?

Free cash flow is simply the real cash a company has left over after paying for everything it needs to keep its business running. That includes its day-to-day costs, plus whatever it spends on equipment, property, or infrastructure to maintain or grow its operations.

Once those costs are covered, whatever cash remains is genuinely free. The company can use it to pay dividends, buy back its own shares, pay down debt, or just hold it in reserve — all without needing to borrow money or raise more from investors to do it.

The formula behind it is simple, and it’s the standard definition used across financial analysis, laid out clearly in Corporate Finance Institute’s own FCF formula guide:

Free Cash Flow = Operating Cash Flow − Capital Expenditures

Operating cash flow is the money a company brings in purely from running its core business, selling products, collecting payments, and covering suppliers and employees. Capital expenditures are what it spends to keep the business competitive: new equipment, facilities, technology, whatever the operation needs to keep functioning or expand.

You don’t need to dig through complicated reports to find this number either. Most stock research sites list a company’s free cash flow directly, and it’s also sitting right there in the cash flow statement of any company’s quarterly or annual SEC filing, both free and public.

Why Profit Can Lie, But Cash Can’t

Here’s why this distinction actually changes how you should read a company’s numbers. Net income, the profit figure everyone focuses on, isn’t pure fact; it’s shaped by a series of accounting decisions companies are legally allowed to make.

A company can spread the cost of a piece of equipment across several years instead of counting it all at once (depreciation). It can count a sale as revenue the moment it ships a product, even if the customer hasn’t paid yet. It can pay employees partly in company stock instead of cash, which still counts as an expense but never touches the company’s actual bank account.

None of this is dishonest; it’s standard, legal accounting practice. But it means two companies can report the exact same profit number while one of them has plenty of real cash sitting in the bank, and the other has almost none.

Free cash flow strips all of that away and asks a much simpler question: how much actual money came in, and how much actual money went out? It doesn’t care how a company chose to schedule its depreciation or when it decided to book a sale.

That’s exactly why it’s a harder number to dress up, and exactly why it tells you something profit alone can’t: whether a company’s success on paper is backed by real money or whether it’s running on accounting technicalities while its actual bank balance tells a different story.

For you as someone researching a stock, this is the practical payoff: if you only check profit, two companies can look equally healthy right up until one of them can’t pay its bills. Checking free cash flow alongside profit is how you catch that difference before it becomes a headline.

When Negative Free Cash Flow Is Actually a Good Sign

One important nuance worth knowing: negative free cash flow isn’t automatically a red flag. A young, fast-growing company that’s deliberately investing heavily in expansion will often run negative free cash flow on purpose, betting that spending now leads to much larger cash generation later.

Companies like Amazon in its early years, or fast-scaling tech and biotech firms today, have all run negative free cash flow for extended stretches while building toward much larger future returns. Motley Fool’s own explainer on negative free cash flow makes the same distinction: negative FCF can be a growth signal or a genuine trap, and the difference lies entirely in context.

The concern arises when negative free cash flow persists for an established company with no clear growth justification or when it continues quarter after quarter without any sign of improvement.

Why Wall Street’s Biggest Names Watch Cash Flow Over Profit

This isn’t just a theory beginners get taught; it’s genuinely how some of the most respected investors in the world evaluate a company before buying it.

Warren Buffett calls this concept “owner earnings,” his own term for essentially the same idea as free cash flow: the real cash a business generates after covering what it needs to keep running and growing.

He’s pointed out that there’s a major difference between a company that needs to keep pouring cash back in just to sustain its growth and one that can grow without constantly consuming cash to do it. In practice, that’s Buffett checking a company’s free cash flow trend before deciding whether the business is actually as strong as its profit numbers suggest.

Michael Mauboussin, a widely respected valuation researcher, makes the same point more directly: free cash flow is what actually funds a company’s future growth, its dividends, and its ability to buy back its own stock.

You can hear this same thinking from working analysts, not just legendary investors. On The Motley Fool’s Industry Focus podcast, two of the firm’s stock analysts discussed what they check before recommending a company.

Free cash flow came up as one of the first things they looked at, specifically whether it’s growing year over year and how much of a company’s revenue is actually converting into real cash instead of staying stuck on paper as an accounting entry.

Profitable on Paper, Broke in Reality: What Happens When Cash Flow Gets Ignored

Here’s what a free cash flow problem actually looks like in real companies, not just in theory.

Toys “R” Us was still reporting profit when it filed for bankruptcy in 2017. The real issue was that a large share of its cash was tied up covering heavy long-term debt payments.

That left less free cash flow available to actually run the business once sales started slipping. The profit on its income statement was real, but by the time debt obligations were paid, there wasn’t enough free cash flow left over to keep the company stable. Looking at profit alone would have missed this entirely.

WeWork shows a different version of the same gap. The company was growing its revenue extremely fast, but its free cash flow was deeply negative; it was spending far more cash expanding than it was bringing in from actual operations.

It covered that gap by continuously raising new outside funding instead of closing it with its own cash flow. That works only as long as new funding keeps arriving. Once investor funding slowed, the negative free cash flow underneath the growth story became impossible to hide.

Amazon and Walmart sit on the opposite end. Both are frequently cited specifically for how they manage their free cash flow, not just their profit.

Walmart negotiates long payment terms with suppliers while moving inventory fast, which means it often collects cash from customers before it even has to pay for the goods, keeping its free cash flow strong even while running a low-margin business. Amazon built the same discipline early, prioritizing a strong free cash flow position as a deliberate strategy.

Cash Runway: How Long Can a Company Survive on What It Has Left?

Once you understand free cash flow, there’s a related number worth checking too, especially for companies that are currently spending more cash than they bring in: cash runway.

It answers a very practical question: if a company kept spending at its current pace and raised no new money, how many months could it keep operating?

Cash Runway = Cash on Hand ÷ Monthly Cash Burn

A company holding $120 million in cash while losing $10 million a month more than it brings in has a 12-month runway. Generally, 18 to 24 months is considered comfortable, while under 12 months starts to warrant closer attention.

What counts as safe depends heavily on the company’s industry and stage of growth. This number shows up regularly in real stock research sites like Simply Wall St, running recurring pieces built entirely around this exact question for individual companies, often titled things like “Will This Company Spend Its Cash Wisely?”

Your Pre-Purchase Checklist: What to Check Before You Buy the Stock

Put all of this together, and here’s your actual checklist the next time you’re researching a stock:

1. Free cash flow, not just net income. Look for whether it’s positive and whether it’s growing or shrinking year over year.

2. Whether negative free cash flow (if present) makes sense. Is this a young company deliberately investing in growth, or an established company bleeding cash with no clear explanation?

3. Debt levels. A debt-to-equity ratio under 0.5 is generally considered conservative; well above that is worth a closer look, especially paired with weak free cash flow.

4. The trend across several quarters, not just one. A single rough quarter isn’t automatically alarming. A pattern repeating quarter after quarter, with no improvement, is.

5. Cash runway, if the company is currently burning cash. How many months can it operate at its current pace before needing new funding?

6. Where new cash is coming from, if the company is falling short. New shares dilute your ownership; new debt adds repayment pressure. Each affects you differently as a shareholder.

The Final Word: Profit Gets the Headlines, Cash Flow Tells the Truth

Profit tells you whether a company made money on paper over some period of time. Free cash flow tells you whether it can actually cover its bills right now and whether it has the real resources to keep growing without leaning on outside funding to survive.

Before you commit money to a stock based on a strong profit number alone, it’s worth spending a few minutes checking whether the cash behind that profit is actually there too. As the companies above show, by the time the gap becomes obvious in the headlines, it’s usually too late to have done anything about it as an investor.

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