Working Capital Explained: The Silent Choke on Profit

Picture the busiest shopkeeper in your lane. His shelves are stacked, customers walk in all day, and at the end of the year his ledger shows a tidy profit. Yet when the rent falls due, he's scrambling — borrowing from a cousin, delaying the electricity bill. How can a man who made money have no money?

Because his profit isn't sitting in a cash box. It's sitting on the shelves as unsold stock, and in a fat notebook of customers who "will pay next month." He's profitable on paper and broke in his pocket. That gap — between the profit a business reports and the cash it can actually touch — has a name. It's called working capital, and it has quietly choked more profitable businesses than any recession.

What working capital actually is

Strip away the jargon and working capital is just this: the money a business has tied up in running day-to-day, after subtracting what it owes in the short term. The textbook formula, in J.P. Morgan's words, is "working capital = total current assets - total current liabilities" (J.P. Morgan).

In plain shopkeeper terms:

• Current assets = the cash on shelves (inventory) + the money owed by customers (receivables) + cash in the till.
• Current liabilities = the money he owes his suppliers, due soon.

Net working capital is what's left of his own money locked inside the business at any moment — capital that is "working," but not earning. The bigger it gets relative to sales, the more cash the business swallows just to stand still. And the way you measure how bad it's getting is working-capital days: roughly, how many days of sales are stuck in the pipe before they turn back into cash. A hundred days means the business is, in effect, lending its customers and shelves three-plus months of its own money, free of charge. (For the day-by-day version of this — how long stock, then collections, then supplier credit each take — see the cash conversion cycle.)

For some businesses this barely matters. A jeweller who sells off a small showroom each week, or an FMCG firm paid by distributors upfront, runs lean. For others, it's the whole ballgame. Which brings us to the businesses where the shopkeeper's nightmare is the normal state of affairs: construction and engineering — EPC, for "engineer, procure, construct."

An EPC business is a giant version of that shopkeeper

Take Kalpataru Projects International (KPIL on the NSE/BSE) — one of India's larger EPC contractors, building power transmission lines, pipelines and railways. This is an example to learn the mechanics on, not a buy or sell call.

In FY26 (the year ended March 2026), KPIL booked sales of about ₹27,143 crore and a net profit of roughly ₹1,031 crore (Inve data, 2026). A healthy, growing business. Now look at the other side of the ledger. On 31 March 2026 the company's gross "Other Assets" — the screener catch-all that lumps together work-in-progress on half-finished towers, materials, bills raised on clients who hadn't paid yet, plus some longer-term advances — stood at about ₹24,499 crore (Inve data, 2026).

But gross assets only tell half the story, and this is exactly where beginners go wrong. That ₹24,499 crore is offset by about ₹16,394 crore the company itself owes short-term — to suppliers, sub-contractors and clients who've paid in advance (Inve data, 2026). Working capital is the net of the two, and the cleanest way to see it is in days. By KPIL's own FY26 results, consolidated net working-capital days came to 75 (KPIL FY26 results, ProjectsMonitor) — roughly one-fifth of a year's sales, about ₹5,577 crore, genuinely frozen in steel in the ground and invoices awaiting payment. That is the EPC shopkeeper's shelves and notebook, scaled to thousands of crores. The profit was real — but a slug of it never arrived as cash; it converted into more half-built projects and more unpaid bills.

And the gross pile grows with the business. As KPIL's sales climbed, its Other Assets climbed too — from about ₹22,142 crore at the end of FY25 to ₹24,499 crore a year later, an extra ₹2,357 crore in a single year (Inve data, 2026). Growth, for a working-capital-heavy business, isn't free. Every new order needs to be funded before it pays back. Win more work, and you must find more cash to carry it — often by borrowing, though, as we'll see, a disciplined operator can fund growth and cut debt at the same time.

How the choke shows up: debt and interest

Here's the chain. Cash stuck in receivables and inventory has to be replaced from somewhere, so the company borrows. KPIL carried roughly ₹3,543 crore of borrowings at the end of FY26, and paid about ₹501 crore in interest that year (Inve data, 2026).

Put that interest next to operating profit and you feel the squeeze. KPIL earned about ₹2,239 crore of operating profit in FY26 — so interest ate up nearly a quarter of it, leaving operating profit covering interest only about 4.5 times over (Inve data, 2026) — that ratio has its own read: interest coverage. Comfortable enough today. But that's the toll a working-capital-heavy model pays every year, win or lose: a slice of profit handed straight to lenders, purely to finance money frozen in the pipe. The shopkeeper who funds his unsold stock on a moneylender's loan understands this in his bones. Profit on the ledger; interest bleeding out the back.

To be fair to KPIL, the theory and this particular example part ways on direction: even as the gross asset pile grew, the company's borrowings actually fell in FY26 — from about ₹4,314 crore a year earlier to ₹3,543 crore (Inve data, 2026) — and it reported consolidated net debt down 53% year-on-year (KPIL FY26 results, ProjectsMonitor). Growth can be funded while deleveraging — but only when collections improve fast enough to feed it. The structural pull toward borrowing is real; a disciplined operator is what keeps it from winning.

This is why two companies with identical profit margins can be worth very different things. The one that collects fast and holds little stock keeps its profit as cash. The one whose cash is permanently stuck on the shelves must borrow to grow — and hands a portion of every year's earnings to the bank. (If the debt itself is what worries you, that's a separate read: how to spot a debt-trap stock.)

Why this matters in India specifically

The unpaid-bills half of the problem is unusually severe here, because getting paid on time is a national struggle. India tightened the screws on it: under Section 43B(h) of the Income Tax Act, effective 1 April 2024, a buyer who doesn't pay a registered micro or small enterprise within the agreed window — "within 15 days" with no written agreement, and not exceeding "45 days from the date of acceptance" with one — loses the tax deduction on that expense until it actually pays (IndiaFilings, on Section 43B(h)).

The very existence of a law forcing 45-day payment tells you how routinely Indian buyers stretch it past that. For a contractor whose clients are big utilities and government bodies — not always the fastest payers — receivables can balloon for reasons entirely outside its control. The shopkeeper's notebook of "pay you next month" is, in India, often a year-long IOU.

Watch what management does about it — and whether it holds

The reassuring thing is that working capital is manageable. A disciplined management chases collections, tightens project terms, and squeezes the days down. The dangerous thing is that "we'll improve working capital next year" is one of the easiest lines to say on a concall and one of the hardest to keep — so it's worth watching as a commitment, not a comfort.

KPIL is a useful case here too. Back in Q1 FY25, management guided that standalone working-capital days would come below 100 by the end of Q4 FY25 — a specific, datable target. It didn't land in that window; in Inve's Promise Tracker the commitment is marked missed (Inve data, 2026). The pipe is genuinely hard to drain on schedule, even for capable operators.

To their credit, they kept at it. By the close of FY26, KPIL's own results announcement reported consolidated net working-capital days down to "75 days" and net debt cut sharply year-on-year (KPIL FY26 results, ProjectsMonitor). That's the right direction. The point isn't to grade one company — two years of guidance can't judge a management, and this is a read on how the number is moving, not a verdict. The point is the discipline: when management commits to a working-capital target, an owner writes down the number and the date, then checks the next four quarters to see if cash actually came back. A target talked about every call but never reached is a yellow flag the income statement will never show you.

That quarter-after-quarter check — did the commitment hold, across every company you own — is exactly the chore nobody has time for by hand across a 10–15 stock portfolio. It's the job Promise Tracker was built to do.

The owner's takeaway

Profit answers one question: did the business earn money this year? Working capital answers a quieter, more important one: can the business get its hands on that money, or is it permanently frozen in shelves and unpaid bills? For an asset-light brand, the answer barely matters. For an EPC contractor, an auto-component maker, or any business that must fund its growth before it gets paid, it's the difference between compounding and just running on a treadmill, borrowing to stay in place.

So when you next read a balance sheet, don't stop at the profit. Take the money tied up in inventory and receivables, subtract what the business owes short-term, hold the net figure against a year of sales — or just read the net working-capital days if they're quoted — and ask the shopkeeper's question: is this profit, or is it just stock on the shelf I haven't been paid for yet?

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