Efficiency ratios

A company reports a wonderful quarter: revenue up thirty percent, profit up more, the growth story intact. Buried in the working-capital note, one number has quietly changed — the time it takes to collect money from customers has climbed from forty-five days to seventy-eight. The profit line is shouting good news. That one efficiency number is whispering a question the profit line cannot hear: if sales are really this strong, why is the cash taking so much longer to arrive? illustrative

Efficiency ratios measure something the P&L never shows: how fast a business moves cash through itself. How long goods sit as inventory before they sell. How long customers take to pay. How long the company itself takes to pay its suppliers. How many rupees of sales it wrings from each rupee of assets. These are the ratios of motion — of capital cycling through the business — and their great virtue is that they turn early, before the profit does. A business getting into trouble usually shows it first in its working capital, because cash stops flowing before earnings stop being reported. This module is about reading that motion, and above all about reading its trend, because in efficiency ratios the direction of travel warns you long before the level does.

Profit can be an opinion; cash flow is closer to a fact; and efficiency ratios are where you catch the gap between the two opening up. They exist because a company can look profitable on the P&L while its cash is silently freezing in inventory that will not sell and receivables that will not pay — and the efficiency ratios show that freezing while the profit line is still smiling. They are an early-warning system wired directly into the working capital.

Four of them carry most of the load. Inventory days measures how long stock sits before it is sold — cash locked in goods. Receivable days measures how long customers take to pay after they are billed — cash locked in other people's hands. Payable days measures how long the company takes to pay its own suppliers — other people's cash, working for it. And asset turnover — sales divided by assets — measures how much revenue the whole asset base generates, the broadest efficiency number of all. The first three combine into the single most useful working-capital measure, the cash conversion cycle: inventory days plus receivable days minus payable days, which is the number of days a rupee is tied up in the business between paying for stock and collecting for the sale. A long cycle means growth eats cash; a short or negative cycle means the business funds itself, or is even funded by its suppliers. This module exists because these ratios are read carelessly more than almost any others — judged on their level, when their level is set by the sector, and ignored on their trend, when their trend is the whole signal.

Measure the motion, then watch the direction.

Read the trend, not the level. The level of any efficiency ratio is set mostly by the sector — a jeweller carries months of inventory, a dairy carries days, and neither number means anything without that context. What means something in any business is the direction. Inventory days rising quarter after quarter says goods are selling more slowly — demand softening, or a build-up that will have to be discounted. Receivable days rising says customers are taking longer to pay — a stressed customer base, looser credit to chase sales, or worse. Payable days rising can be strength (better supplier terms) or stress (the firm cannot pay on time); the trend flags it, and you go and find out which. Always compare a company with its own past first, and only then with peers.

Turnover and days are the same fact inverted. Asset turnover, inventory turnover, receivables turnover — the "turnover" versions — are just the reciprocal of the "days" versions. Inventory that turns over 12 times a year is the same as 30 inventory days; a receivables turnover of 8 is the same as roughly 45 receivable days. Use whichever is clearer for the point, but know they are one measurement seen from two ends: how many times capital recycles in a year, or how many days each cycle takes.

The cash conversion cycle ties it together. Add the days cash is stuck in inventory and receivables, subtract the days you get to hold onto suppliers' money, and you have the number of days each rupee is trapped in the business. This is the number that decides whether growth is cheap or expensive. A long positive cycle means every rupee of new sales needs fresh working capital behind it, so fast growth drains cash — the faster it grows, the more it must fund. A negative cycle means customers pay before suppliers are due, so the business grows on its suppliers' money and needs almost no capital to expand. Watching the cycle lengthen is one of the earliest signs that a growth story is quietly turning into a cash problem, often a full year before the P&L admits anything is wrong.

Efficiency ratios are more sector-bound than almost any other family — the same number is normal in one business, alarming in another, and meaningless in a third. Here is the working-capital picture across four businesses, with the point that you must know the sector's normal before a level can speak.

The thread is that efficiency ratios have almost no meaning as absolute numbers and enormous meaning as trends and as sector-relative readings. A negative cash conversion cycle is a mark of power for an FMCG firm and would be near-impossible for an EPC contractor, whose business is structurally cash-hungry — so the same cycle length carries opposite messages. For an IT services firm the cycle collapses to a single line, receivable days, because there is no inventory to speak of, and that one line becomes the whole working-capital story. For a retailer, inventory turnover is the pulse. In each, the discipline is the one this part keeps returning to: find the sector's normal first, then read the company against its own history, and treat the direction of the number as the signal. A level ripped out of its sector is a temperature with no scale; a trend is a story you can act on.

A composite auto-components supplier reports a strong year — revenue up 24%, profit up 28% — and the market is pleased. Look at the working capital underneath the profit, and a different story starts to show. illustrative

Walk the three days. Inventory days have risen from 40 to 58: the firm is holding more stock relative to sales, which could be a deliberate build ahead of a new model launch, or could be goods that are moving more slowly than they used to. Receivable days have risen from 52 to 81: customers are taking a month longer to pay, a large move that revenue growth alone cannot explain. Payable days have crept up too, from 45 to 60, which cushions the cash impact a little — but note why that might be, because stretching suppliers can be strength or can be the firm scrambling to hold onto cash. Put them together and the cash conversion cycle has stretched from 47 days to 79 days. Every rupee of sales is now trapped in the business a full month longer than it was.

Now the consequence. Profit grew 28%, but with the cycle lengthening this much, almost none of that profit is showing up as cash — it has flowed straight into a swelling pile of inventory and receivables. The single most important cross-check follows immediately: compare operating cash flow with reported profit, and you would expect to find cash flow lagging badly, because the working capital has swallowed the earnings. The efficiency ratios have done their job — they flagged, a year before it would show anywhere else, that this "strong year" is a year in which the company grew its profit and its receivables together, and the quality of that growth now hangs on whether those receivables are real and collectible or the residue of sales pushed to customers who cannot pay. The habit is to read the working-capital trend as a lie-detector on the profit line.

Set the three levers of the cash conversion cycle — how long stock sits as inventory, how long customers take to pay, and how long you take to pay your own suppliers — and watch the days of cash tied up in the business swing from a drain into a source. Push payable days past the sum of inventory and receivable days and the cycle turns negative: the business is now funded by its suppliers, and every rupee of growth needs no working capital of its own.

An efficiency ratio tells you that something moved, never why it moved. Receivable days rising could be a stressed customer base, deliberately looser credit to win share, a genuine mix shift toward slower-paying customers, or outright channel stuffing — and the number is identical in every case. The ratio raises the flag and points at the working capital; the reason is a separate search through the notes, the customer concentration, and the management commentary. Reading the move as automatically sinister is as wrong as ignoring it; the move is a question, and the answer is elsewhere.

Nor can these ratios judge the quality of what is on the balance sheet. Inventory days assume the inventory is saleable, but some of it may be obsolete stock that will have to be written off. Receivable days assume the receivables are collectible, but some may be from customers who will never pay. The days count the size of the pile; they cannot tell you how much of it is good. A stable inventory-days number can hide a growing lump of dead stock, and a flattering receivables number can hide a hardening core of bad debt — which is why the notes on provisioning and ageing matter as much as the ratio.

And efficiency ratios are noisy over short periods and around seasonal peaks. A quarter-end that falls just after a big shipment can make receivable days spike for reasons that reverse next month; a seasonal business will show inventory building ahead of its selling season every single year, which is normal and not a warning. A single-quarter reading can mislead in both directions, which is why the trend matters and why it should be read over several periods and against the same quarter a year earlier, not against the quarter just gone.

How it comes up. When working capital deteriorates alongside good headline numbers, a sharp analyst asks management to explain the cash, not just the profit. The question sounds like this: "Receivable days went from 52 to 81 this year. What's driving that — customer mix, extended credit, or collection issues? And how much of the profit growth actually converted to operating cash?" The analyst is testing whether the strong P&L is turning into money.

A good answer, verbatim-style.

"Fair to flag it. About half the receivables increase is a genuine mix shift — we won a large OEM customer on 90-day terms, which is standard for that channel and good business. The other half is slower collection from two smaller customers we're watching, and we've made a provision against one. Operating cash flow was about 70% of profit this year, down from 95%, mostly because of this. We expect it to normalise as the OEM ramp stabilises."

That answer separates the benign part of the move from the worrying part, quantifies the cash conversion, and does not pretend the working capital is fine.

An evasive answer, verbatim-style.

"Working capital was a bit elevated this year due to strong growth and some timing at the quarter-end, but it's well within our normal range and we're very comfortable with the quality of our book. Nothing structural — it should come back to normal levels."

Notice the moves: "strong growth" cannot explain days rising far faster than sales; "timing at quarter-end" is the universal excuse for a working-capital build; and "comfortable with the quality of our book" asserts collectibility without a single number on provisions or cash conversion.

The follow-up nobody asks, and what its absence means. "What was operating cash flow as a percentage of profit, and what is the ageing of the receivables over 90 days?" That forces the working-capital story onto hard numbers — how much profit became cash, and how much of the receivable pile is old enough to worry about. If the room accepts "elevated due to growth and timing" without the cash-conversion figure, either the cash conversion was poor and the growth is not turning into money, or the receivables are ageing and nobody wants to put a number on it. A working-capital build that management waves away with "timing" and "growth," and that no one converts into a cash-flow number, is the setup this module exists to catch.

1. Judging the level instead of the trend. The level of any efficiency ratio is set by the sector — months of inventory is normal for a jeweller and alarming for a dairy. The signal is the direction over time and against the company's own history, not the absolute number.

2. Missing receivables running ahead of sales. When receivable days climb far faster than revenue, the cash is not following the sales — a flag for customer stress, loosened credit, or channel stuffing, no matter how good the profit line looks.

3. Reading rising payable days as automatically good. Longer supplier terms can be bargaining strength or the sign of a firm that cannot pay on time. The trend flags it; the reason decides whether it is power or distress.

4. Ignoring the cash conversion cycle. A lengthening cycle means growth is consuming more cash each period — a growth story quietly turning into a cash problem, often a year before the P&L shows any strain.

5. Trusting the days to judge quality. Inventory days assume the stock is saleable and receivable days assume the bills are collectible. A stable number can hide obsolete inventory or hardening bad debt; the ageing and provisions matter as much as the ratio.

6. Over-reading a single seasonal or quarter-end reading. Efficiency ratios spike around shipments and selling seasons for benign reasons that reverse. Read them over several periods and against the same quarter a year earlier, not against last quarter.