Working capital: the cash quietly trapped inside a business

We've touched working capital twice already — once on the balance sheet, once in the cash-flow chapter — because it keeps turning up wherever profit and cash disagree. It deserves a chapter of its own, because working capital is where a great many profitable Indian companies quietly run out of money. Not from losses. From cash that the business has earned on paper but cannot lay its hands on, because it's frozen inside the operation itself.

Start with the plain definition. Working capital is current assets minus current liabilities — but for the purpose of understanding a business, the part that matters is operating working capital: the cash tied up in inventory and in money customers owe you (receivables), less the money you owe your suppliers (payables). It is, in one phrase, the cash the business needs to keep its day-to-day cycle turning.

Follow one rupee around the cycle

The clearest way to feel working capital is to follow a single rupee on its journey through a manufacturer. The rupee buys raw material. The material sits in a warehouse for a while. It gets turned into a finished product, which sits in another warehouse. The product is sold — but on credit, so now it's an unpaid invoice. Weeks or months later, the customer finally pays, and the rupee comes home, ready to start again. The length of that journey is everything.

Accountants measure each leg of the journey in days, and three numbers capture it:

• Days inventory — how long, on average, stock sits before it's sold. Long means cash frozen on shelves and a risk of obsolescence.
• Days receivable (DSO) — how long customers take to pay after the sale. Long means you're financing your customers' businesses for free.
• Days payable (DPO) — how long you take to pay your suppliers. Long means your suppliers are financing you — a good thing, within reason.

Why growth can drain a profitable company dry

Here is the lesson that surprises people most, and it is genuinely counterintuitive: for a company with a long cash conversion cycle, faster growth makes the cash problem worse, not better. Profit and intuition both say growth is good; working-capital arithmetic says growth is expensive, and the bill comes due before the rewards do.

This is why an experienced investor, on seeing a fast-growing company, immediately asks: is this growth self-funding, or is it consuming cash? A company that grows while its working capital stays flat or shrinks is a machine that funds its own expansion — wonderful. A company whose receivables and inventory balloon faster than revenue is buying its growth with borrowed money, and every percentage point of growth is quietly increasing its fragility.

Negative working capital: the businesses that run on other people's money

The mirror image is one of the most beautiful structures in business. Some companies have negative working capital — they collect from customers before they pay suppliers. A supermarket sells you groceries for cash today but pays the supplier in 45 days. A subscription software firm collects a year's fee upfront but delivers the service month by month. These businesses are, in effect, funded by their own customers and suppliers — they have a permanent, interest-free, ever-growing pool of someone else's cash to run on, and growth releases cash rather than consuming it.

Working capital as an early-warning system

Beyond funding, the trend in working capital is one of the most sensitive early-warning instruments you have — it moves before the income statement does. Trouble shows up in the cycle months or quarters before it reaches reported profit, because management can defer recognising a problem in earnings far longer than it can hide it in the days-receivable number.

There's a darker edge too. Because the cash conversion cycle directly links to cash, a company under pressure can temporarily flatter it by simply not paying its suppliers — stretching payables so far that the cycle looks artificially tight. That's why you read the legs separately, not just the net cycle: a 'good' cycle achieved by abusing suppliers (very high days-payable) is a warning, not a strength, because it borrows against future supplier goodwill that will eventually be withdrawn.

Put the chapter in one sentence: profit tells you whether a business earned; working capital tells you whether it can afford to grow. The two can point in opposite directions for years — and when they do, the working-capital signal is usually the one telling the truth.