Working capital explained: the current ratio and the cash conversion cycle

KARACHI: Companies rarely die from a lack of profit. They die from a lack of cash — a profitable factory that cannot pay its suppliers this Friday is in as much trouble as an unprofitable one. Working capital is the machinery that stands between profit and cash: the stock sitting in the warehouse, the invoices customers have not yet paid, and the bills the company itself has not yet settled. Manage that machinery well and cash flows almost automatically; manage it badly and growth itself becomes a trap, because every extra rupee of sales needs another rupee of funding before the customer pays. This guide explains working capital from the ground up — what it is, the ratios investors use to measure it, and the cash conversion cycle, the single most useful working-capital tool in a PSX investor's kit.

What working capital actually is

On a balance sheet you will find two matching blocks: current assets — things expected to turn into cash within a year, mainly inventories, trade receivables (amounts customers owe) and cash itself — and current liabilities — obligations due within a year, mainly trade payables (amounts owed to suppliers), short-term borrowings and other near-term dues. Working capital, in its simplest definition, is current assets minus current liabilities. Analysts often narrow it to the operating core — inventories plus receivables minus payables — and call that net working capital, setting cash and bank debt aside to focus on the trading cycle itself.

Think of a small illustrative business, a distributor of auto parts. It buys Rs 10 million of parts from manufacturers, holds them for a while, sells them to workshops on sixty days' credit, and pays its own suppliers after forty-five days. At any moment it might have Rs 8 million of stock on shelves, Rs 12 million owed by customers, and Rs 7 million owed to suppliers. Its operating working capital is 8 + 12 − 7 = Rs 13 million — real money, funded by the owner's capital or by a bank, permanently tied up just to keep trading at that scale. Nothing about this is wasteful; it is the physics of selling on credit. But notice the consequence: if sales double, stock, receivables and payables roughly double too, and working capital swells towards Rs 26 million. Somebody has to fund that extra Rs 13 million before the new customers pay. This is why fast-growing companies so often report rising profits and falling cash at the same time — a puzzle our walkthrough of the cash flow statement unpacks in detail.

Working capital needs differ enormously by trade, and the differences explain much of what you see on the PSX. A cement plant holds clinker and coal stocks and sells largely against advance payment or short credit. A textile mill carries cotton through a long production chain and waits on export customers abroad. A supermarket-style retailer sells for cash the day stock arrives but pays suppliers weeks later — it can run on negative working capital, funded by its own suppliers. A power company accumulates receivables from a single state-linked buyer, which is why its working capital story is inseparable from Pakistan's circular debt. Same formulas, completely different businesses.

The current ratio and the quick ratio

The headline liquidity measure is the current ratio: current assets divided by current liabilities. Using round illustrative figures, a company with current assets of Rs 5,000 million and current liabilities of Rs 2,500 million has a current ratio of 2.0 — two rupees of near-term assets for every rupee of near-term obligations. A ratio below 1.0 means current liabilities exceed current assets: on paper, the company cannot cover its coming year's obligations from its coming year's assets, and depends on profits arriving on time, assets selling at book value, or lenders renewing short-term lines. That is not automatically a crisis — companies with fast, predictable cash cycles operate safely below 1.0 — but it removes the margin for error, and it is a common thread in the leverage problems described in our guide to debt ratios and interest cover.

The current ratio has a soft spot: inventories. Stock is counted at its recorded value, but stock that cannot be sold — last season's designs, obsolete spare parts, cotton bought at prices the market no longer pays — is not money. The quick ratio (or acid-test ratio) strips inventories out: (current assets − inventories) ÷ current liabilities. Take the company above and assume Rs 2,000 million of its current assets are stock. Its quick ratio is (5,000 − 2,000) ÷ 2,500 = 1.2. Still above 1.0, but the cushion is far thinner than the current ratio suggested. The gap between the two ratios is itself diagnostic: a wide gap tells you the business is stock-heavy, and that the quality and saleability of that stock is a question worth asking at results time.

Use both ratios the way analysts do — comparatively and over time. Compare a company against its own five-year history and against direct competitors in the same sector, never against a universal benchmark, because "normal" for a bank (where these ratios barely apply at all), a utility and a trading company are three different worlds. And watch direction: a current ratio sliding from 1.8 to 1.1 over three years, alongside rising short-term borrowings, is a story of tightening liquidity long before it becomes a headline.

The cash conversion cycle: the heart of the matter

Ratios give levels; the cash conversion cycle (CCC) gives speed. It measures, in days, how long a company's cash is out of its hands — from the day it pays for raw materials to the day the customer's payment lands. It has three components, each a simple division:

• Days inventory outstanding (DIO) = inventories ÷ cost of sales × 365. How long stock sits before it is sold.
• Days sales outstanding (DSO) = trade receivables ÷ revenue × 365. How long customers take to pay.
• Days payables outstanding (DPO) = trade payables ÷ cost of sales × 365. How long the company takes to pay its suppliers.

The cycle is CCC = DIO + DSO − DPO. Run an illustrative example. A manufacturer holds inventories of Rs 1,825 million against annual cost of sales of Rs 7,300 million: DIO = 1,825 ÷ 7,300 × 365 = about 91 days. Receivables of Rs 1,200 million on revenue of Rs 10,950 million give DSO = about 40 days. Payables of Rs 912 million give DPO = 912 ÷ 7,300 × 365 = about 46 days. The cycle is 91 + 40 − 46 = 85 days. For 85 days of every sale, the company is funding its customers and its warehouse out of its own pocket or its bank's. Multiply the cycle by daily sales and you get the cash permanently imprisoned in the trading loop — shorten the cycle by ten days, at this scale, and roughly Rs 300 million of cash walks free (an illustrative arithmetic consequence, not a forecast). That is why management teams obsess over these numbers, and why a lengthening cycle is one of the most reliable early warnings an investor can track: it usually shows up in the balance sheet a year or two before it shows up in the share price story.

Reading the three levers like an operator

Each component of the cycle can improve or deteriorate for good reasons and bad ones, and telling them apart is the real skill. Inventory days rising might mean the company is stocking up ahead of a price increase or a seasonal peak — sensible — or that demand has slowed and unsold goods are piling up. The notes to the accounts and the directors' report usually hint at which; a rise paired with falling sales is the worrying version. Receivable days rising can mean the company is offering generous credit to win market share, or that its customers are struggling to pay — or, in sectors selling to government-linked buyers, that state payments have slowed again. A receivables balance growing much faster than revenue, year after year, deserves a hard look: revenue booked is not revenue banked. Payable days rising looks like free financing, and up to a point it is — strong buyers negotiate long terms. Stretched too far, though, it signals a company that cannot pay on time, and suppliers respond with higher prices, cash-on-delivery demands or legal notices.

Negative cycles deserve their own note. When DPO exceeds DIO + DSO, the company collects from customers before it pays suppliers, and its trading actually generates cash as it grows — the classic model of large retailers and some distributors. It is a genuine competitive advantage, but a brittle one: it depends on supplier goodwill and sales momentum, and if sales fall, the cycle runs backwards and cash drains quickly. On the PSX, also keep an eye on two local features. First, related-party balances: receivables from or payables to sister companies inside a group can be large, slow-moving and priced by negotiation rather than by market, so the true cycle may be softer than the ratios suggest. Second, in the energy chain, receivables from state buyers and payables to fuel suppliers both balloon when circular debt builds — working capital there is partly a policy variable, not purely a management one.

Working capital, profits and the growth trap

Return to the growing distributor from the opening. Suppose it grows sales 30 percent a year, earns a genuine profit margin, and yet its bank overdraft rises every year while its owners see no spare cash. Nothing is being stolen and nothing is misreported: the growth is eating the working capital. Every rupee of additional sales requires stock bought weeks earlier and wages and freight paid now, against payment arriving months later. External funding — usually short-term running finance in Pakistan — fills the gap, and the interest on it lands in the very finance-cost line whose burden our debt-ratios guide teaches you to check. This is the growth trap, and it explains a pattern beginners find baffling: the income statement says success, the balance sheet says strain.

The mirror image appears in decline. A shrinking company's working capital unwinds — stock is sold and not replaced, old receivables are collected, new borrowing stops — so a failing business can throw off cash for a year or two even while reporting losses. Cash flow alone, like profit alone, can mislead; the statements must be read together, which is precisely the discipline the three-statement guides build, starting with the income statement and the balance sheet.

There is also a profitability angle investors sometimes miss: working capital is capital. A company that needs Rs 13 of working capital to support Rs 100 of sales must employ more total capital than a rival that needs Rs 6 — and therefore earns a lower return on the same profit. When you compare two companies' returns using the measures in our ROE and ROA guide, a lean cash conversion cycle is often the invisible reason one of them compounds faster. Retailers and distributors live or die on this; for them, the CCC is not a back-office metric, it is the business model.

A ten-minute working-capital check

Here is a routine you can apply to any PSX company with nothing but its annual report. First, compute the current ratio and quick ratio for the latest year and the year before — two divisions each. Second, compute DIO, DSO and DPO and hence the cash conversion cycle for both years; the inputs are inventories, receivables, payables, revenue and cost of sales, all on the face of the statements. Third, ask three questions. Is the cycle lengthening, and if so, which lever moved? Is working capital growing faster than sales? And is short-term borrowing growing to fund the gap — connect your answer to the borrowings note and the finance-cost line. Finally, read the directors' report and the notes for explanations: management usually comments on stock build-ups and receivable recoveries, and an absence of comment where the numbers moved sharply is itself a comment.

Do this for two reporting cycles and a pattern-recognition instinct develops that no single ratio provides. You will start to see companies the way their bankers do — not as stories, but as machines that either convert sales into cash or convert cash into sales. Both can be profitable for a while. Only one is sustainable. This article is educational content, not financial advice; it teaches you how to read the machine, and the judgements you build on that reading remain your own.

Key takeaway: working capital is the cash trapped between buying stock and getting paid — the current and quick ratios measure the cushion, and the cash conversion cycle (inventory days + receivable days − payable days) measures how many days of every sale you are funding yourself.