Working Capital Explained

Working capital is the money a company ties up in the everyday running of its business: current assets minus current liabilities. It funds the gap between paying suppliers and collecting from customers. Rising working capital quietly drains cash; falling or negative working capital can release it. Either way, it directly affects free cash flow.

Most investors stare at profit and ignore the cash a company must leave on the table just to keep trading. That cash is working capital, and it explains why two companies with identical profits can have very different amounts of money in the bank at year end.

Where this fits: working capital is where the balance sheet and the cash flow statement meet. It feeds directly into free cash flow and the quality of a business under the Five Criteria.

What Working Capital Actually Is

Every trading business has a gap to fund. It buys or makes goods, holds them for a while, sells them, then waits to be paid. In the meantime it has already paid its own suppliers and staff. Working capital is the cash that sits inside that gap.

The headline definition is simple:

Working capital = current assets − current liabilities

Current assets are things expected to turn into cash within a year: cash itself, receivables (money owed by customers), inventory and prepayments. Current liabilities are what the company owes within a year: payables (money owed to suppliers), short-term debt, accrued expenses and tax due.

The version investors actually use

The headline number mixes in two items that distort the operating picture: surplus cash and short-term debt. Neither is really part of the day-to-day trading cycle. So analysts usually strip them out:

Operating working capital = (receivables + inventory + other operating current assets) − (payables + other operating current liabilities)

This is the figure that tells you how much cash the business ties up purely to trade. It is the version I focus on, because it isolates the operating engine from financing and treasury decisions.

Component	Where it sits	What it represents
Inventory	Current asset	Goods paid for but not yet sold
Receivables	Current asset	Sales made but not yet collected
Prepayments	Current asset	Costs paid before the benefit is received
Payables	Current liability	Supplies received but not yet paid for
Accrued expenses	Current liability	Costs incurred but not yet invoiced
Deferred revenue	Current liability	Cash collected before delivery

That last line, deferred revenue, is one of the most investor-friendly items on the whole balance sheet, and it deserves its own guide.

The Cash Conversion Cycle

Working capital is a snapshot. The cash conversion cycle turns it into a measure of speed: how many days of cash the business ties up between paying out and collecting in.

It has three parts:

• Days inventory outstanding (DIO): how long goods sit before being sold.
• Days sales outstanding (DSO): how long customers take to pay, covered in depth in our guide to days sales outstanding and receivables quality.
• Days payable outstanding (DPO): how long the company takes to pay suppliers.

Cash conversion cycle = DIO + DSO − DPO

A shorter cycle is better. It means the company funds less of its own growth and generates cash faster. A lengthening cycle is often the first sign that something is wrong, even when profit still looks healthy.

A worked example

Imagine a company, Company A, a maker of branded kitchen equipment. In its latest year it reports:

• Days inventory outstanding: 70 days
• Days sales outstanding: 55 days
• Days payable outstanding: 40 days

Its cash conversion cycle is 70 + 55 − 40 = 85 days. In plain terms, Company A funds roughly 85 days of trading out of its own pocket. If annual revenue is £365m, that is around £85m of cash locked up in the business at any moment, just to keep the lights on.

Now suppose management negotiates better supplier terms, pushing payables to 60 days, and tightens collections, pulling receivables to 45 days. The cycle shrinks to 70 + 45 − 60 = 55 days. That single change frees roughly £30m of cash without selling a single extra kettle. (This example is hypothetical, used to show the mechanics.)

Why Growth Eats Cash

Here is the point most beginners miss. For a normal business, growing sales means growing working capital. More sales need more inventory on the shelf and create more unpaid invoices. Payables rise too, but rarely by enough to cover the gap.

So a fast-growing company can report rising profit and still burn cash, because every extra pound of sales demands more cash tied up before it comes back. This is not fraud or weakness; it is arithmetic. But it has two consequences for investors:

1. Reported profit overstates cash in the growth phase. The difference shows up as an increase in working capital on the cash flow statement.
2. The quality of growth matters. Growth that soaks up cash faster than it generates it can leave a company dependent on borrowing or share issuance, which can lead to dilution or a stretched balance sheet.

This is also why working capital links straight to return on invested capital. Working capital is part of the capital a business invests to operate. A company that grows while tying up less working capital earns a higher return on every pound deployed.

The Magic of Negative Working Capital

Some of the best businesses run with negative working capital. Their current liabilities exceed their current operating assets, which sounds alarming but is often a mark of real strength.

Think about a supermarket. It sells goods for cash the moment customers walk out, yet pays its suppliers 30 to 60 days later. It is, in effect, holding other people’s money while it trades. The same is true of a subscription software firm that bills a year upfront, or an insurer that collects premiums before paying claims.

When a company grows with negative working capital, growth actually generates cash rather than consuming it. That is a powerful tailwind. It is one reason investors prize businesses with genuine pricing power and strong competitive advantages: the moat often shows up first as favourable terms with customers and suppliers.

A word of caution. Negative working capital is only healthy when it reflects a strong position, not a weak one. A struggling company can also show falling working capital because it is stretching suppliers to breaking point and running down inventory it cannot afford to replace. The number looks the same; the story is the opposite. Always read the components, not just the total.

How to Read Working Capital in Practice

When I look at a company’s working capital, I work through four checks.

1. Look at the trend, not the level

One year’s figure means little. Pull five years of operating working capital and express it as a percentage of revenue. A stable or falling ratio is good. A ratio creeping upward year after year means growth is getting more cash-hungry, which is a quiet warning. This kind of drift is a classic entry in any list of business red flags.

2. Break it into components

If working capital is rising, find out why. Is it inventory, receivables or both? Rising inventory can mean stock is not selling. Rising receivables can mean the company is funding customers to keep sales growing, or that customers are struggling to pay. Both deserve a closer look.

3. Compare receivables and inventory growth with sales growth

The single most useful cross-check. If receivables or inventory are growing faster than sales, cash is being tied up disproportionately. This is a well-known sign of weakening earnings quality, because it often precedes write-downs or a collection problem.

4. Trace it through the cash flow statement

The operating section of the cash flow statement lists the change in each working capital item. These lines are the bridge between the profit on the income statement and the cash the business actually produced. If profit keeps rising while operating cash flow lags behind, working capital is usually the reason, and that gap is worth understanding before you buy.

Working Capital and the Five Criteria

Working capital does not get a criterion of its own, but it quietly runs through several of them.

• A great business ties up little working capital relative to its sales, so growth is cheap to fund.
• A durable moat often shows up as favourable terms: customers who pay early, suppliers who wait.
• A sound balance sheet is harder to judge without understanding seasonal working capital swings, which can make a company look more or less indebted depending on the reporting date.
• A reasonable price depends on free cash flow, and free cash flow is what is left after working capital has taken its share.

In short, working capital is one of the places where business quality becomes visible in hard numbers rather than narrative.

Frequently Asked Questions

What is a good working capital ratio? There is no single number. A current ratio between 1.2x and 2.0x is comfortable for many businesses, but strong firms with pricing power often run below 1.0x because suppliers and customers fund them. Judge it against the company’s own history and its sector peers, not an abstract rule.

Is negative working capital bad? Not necessarily. For a supermarket or subscription business it is often a sign of strength: customers pay upfront or on the spot while suppliers are paid later, so the business runs on other people’s money. It is only a problem when it reflects stretched suppliers or looming liquidity trouble.

Where do I find working capital changes? In the operating section of the cash flow statement, under headings such as change in receivables, change in inventories and change in payables. These lines reconcile reported profit to operating cash flow.

Does working capital affect free cash flow? Yes, directly. An increase in working capital reduces free cash flow because cash is tied up in receivables and inventory. A decrease releases cash. Over a full cycle, working capital changes should roughly wash out for a stable business.

What is the difference between working capital and operating working capital? Headline working capital is all current assets minus all current liabilities, including cash and short-term debt. Operating working capital strips those two out to isolate the cash tied up purely in trading. The operating version is more useful for judging the business itself.

Your Next Step

Pull five years of receivables, inventory and payables for one company you follow, express working capital as a percentage of revenue, and check whether the trend is rising or falling. Then read our guides to days sales outstanding and receivables quality and deferred revenue to go deeper on the two components that move the most. When you are ready to put it all together, the cash flow statement walkthrough shows how working capital turns profit into cash.

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About the author: Cameron Hayes is a senior investor relations and finance professional who has worked in IR at Nasdaq Copenhagen-listed companies including Nilfisk and Maersk Drilling. He holds an MSc from Copenhagen Business School and a BCom from the University of Ottawa, and founded Gingernomics to teach individual investors the Five Criteria framework. More about Gingernomics.

The content on Gingernomics is for educational and informational purposes only and does not constitute financial advice. Always do your own research and consult a licensed financial advisor before making any investment decisions. Past performance is not indicative of future results.