Inventory: How It Is Valued and Why the Method Changes Profit

Inventory is what a business has bought or made and not yet sold, carried on the balance sheet at what it cost. The trouble is that the same ream of paper was bought at four different prices in one year, so which price sits on the shelf? A cost formula decides, chosen once and applied consistently, and that choice moves reported profit without moving a single transaction.

Here is what sits underneath that sentence, and it is worth being blunt about it. Nothing in the paragraph above involves a single extra rupee being spent, a single extra ream being bought, or a single notebook being sold differently. Anjani Stationers Private Limited bought exactly the paper it bought, at exactly the prices it paid, and delivered exactly the notebooks it delivered. The transactions are fixed and beyond argument. The answer to a question the transactions never asked is not fixed: of the 85,000 reams that passed through the godown, the 14,000 still standing there at the year end came in at which price?

Paper is paper and nobody tagged the reams, so the question has no factual answer. Accounting supplies a rule instead of a fact, and the rule is called a cost formulaA stated rule for deciding which of several purchase prices attaches to the units still unsold at the year end. The formula is a convention chosen in advance, not a discovery about which physical goods remain.. Three categories sit inside one inventory number, one identity ties opening stock, purchases and closing stock to the cost charged against the year, and India permits two formulas for the closing figure. For Anjani Stationers in year two the two formulas did not report the same profit, and a 47.4 per cent rise in inventory against a 12.5 per cent rise in revenue supports fewer conclusions than it seems to.

What is inventory, and what are the three categories inside one balance sheet number?

Start with the shape of the thing before any arithmetic. A walk through Anjani Stationers' premises passes three quite different piles, all of which end up added together into one line on the balance sheet. There is raw paper, stacked in reams, bought from a mill and not yet touched. There is work in progressGoods that have been started but not finished on the reporting date. Such goods carry the cost of the materials used so far plus whatever conversion cost has attached to them, and they are neither raw material nor saleable stock., meaning sheets already cut and stitched into blocks but not yet covered, trimmed or wrapped. And there are finished notebooks, packed and banded, waiting for a delivery to Sunrise Public School or to a retail counter.

The balance sheet shows those three piles as one number. The split shows where in the process the business is stuck, so the number that matters analytically is almost never the total but the split. A household kitchen the week before a large wedding has the same shape. Sacks of rice in the store room, half-prepared sweets on trays, and finished boxes ready to go out are three completely different situations, even though somebody totalling up the kitchen's value would add them into one figure. A store room bulging with rice means one thing about the household's buying. Trays of half-prepared sweets that never seem to reduce mean something else entirely, and it is usually a problem with the people or the equipment rather than with the buying. The total shows the kitchen is full. Only the split shows where the queue is.

The same reading applies to a stationery business. Raw paper building up points at purchasing, at a price view somebody has taken, or at a season being stocked for. Work in progress building up points at the binding line. Finished goods building up points at demand, the most uncomfortable of the three. The business has already spent everything it was going to spend, and the goods are still there. Anjani Stationers closed year two with Rs 28,00,000 of inventory. The single figure sits on the balance sheet, the split behind it lives in the notes to the accounts, and no split has been published for Anjani Stationers. The habit worth building is simple: an inventory total calls for the three-way split behind it before any view is formed about it.

Why does fixing the closing figure fix the profit figure?

Now the mechanical heart of the matter, and it is one line of arithmetic that decides everything else. Opening inventory plus purchases less closing inventory equals the cost of materials consumed. The identity reads as a story rather than as a formula. The business started the year holding some paper. It bought more during the year. Whatever it is still holding at the end was clearly not used, so the difference between what it had available and what it still has is what got used up, and what got used up is what is charged against the year's revenue.

Now look at what that identity does to the three quantities inside it. Opening inventory is last year's closing figure and is already published, so it cannot move. Purchases are a stack of supplier invoices and cannot move either. Two figures remain, closing inventory and the cost consumed, tied together by one equation. One equation with two unknowns means fixing either one fixes the other, so every rupee added to closing inventory is a rupee taken out of the cost charged against the year, and therefore a rupee added to profit.

One equation with two unknowns is why the choice of cost formula is not a housekeeping matter. The formula looks like a bookkeeping convention about which price attaches to which ream, and it behaves like a lever on reported profit. Work an example that is deliberately not the real one, so the mechanism stands clear of the case. Anjani Stationers had Rs 1,76,50,000 of paper available in year two and closed at Rs 28,00,000, so Rs 1,48,50,000 was consumed. Suppose the closing figure had instead come out at Rs 30,00,000. Then the consumed figure would be Rs 1,46,50,000, gross profit would be Rs 1,23,50,000 rather than Rs 1,21,50,000, and profit would be Rs 2,00,000 higher. Not one extra notebook was sold. The seesaw simply tilted.

What is Gross Profit, and how does the closing inventory figure decide it?

Gross Profit is revenue less the cost of the goods that were sold. Gross Profit is the first rung on the ladder, and it answers a narrower question than most readers assume: does the thing itself make money, before anybody runs a business around it? Anjani Stationers reported revenue of Rs 2,70,00,000 in year two and a cost of materials consumed of Rs 1,48,50,000, so Gross Profit was Rs 1,21,50,000. As a percentage of revenue that is 45.0 per cent. The 45.0 per cent is the gross marginGross profit expressed as a percentage of revenue. Restating the rupees as a rate makes two businesses of different sizes comparable and hides how many rupees are actually involved., and it is exactly the rate Anjani Stationers reported in year one as well.

The exclusions are the whole point of Gross Profit: not one rupee of the cost of running the business appears above this line, so wages, rent, insurance, the audit fee, interest and tax are all still to come. Picture a street vendor selling bhelpuri. She buys puffed rice, sev, onions and chutney for Rs 12 a plate and sells at Rs 30. Her gross profit is Rs 18 a plate and her gross margin is 60 per cent, and both figures are true and both are entirely silent about the cart rental, the licence, the cost of the gas, and the hours she stood there. A 60 per cent gross margin on a plate is compatible with a good week and with a bad one. A gross margin measures the plate, not the business.

The closing inventory figure sits directly on top of Gross Profit rather than somewhere off to the side, for one reason. The cost half of the calculation is not the cheque book. The cost half is the identity above, so Gross Profit is only as firm as the closing stock figure feeding it. Two permitted ways of arriving at that closing figure exist, and they do not arrive at the same place.

How does first-in-first-out assign a cost to the reams still on the shelf?

Anjani Stationers bought paper four times over the two years that matter here, and the prices were not stable. The business carried 10,000 reams into year two at Rs 190, bought 30,000 at Rs 205, then 30,000 at Rs 220, then 15,000 at Rs 200. Eighty-five thousand reams passed through the godown for Rs 1,76,50,000, and 14,000 were still there on the last day of the year.

First-in-first-outA rule that treats the earliest cost as leaving first, so the units still held are assigned the most recently paid prices. Often shortened to FIFO in working papers. answers the question by assuming the oldest cost leaves first. Under that rule the reams that got consumed are the opening stock, then purchase one, then purchase two, then as much of purchase three as is needed to reach 71,000 reams. Count it out: 10,000 plus 30,000 plus 30,000 is 70,000, so exactly 1,000 reams of purchase three were consumed and 14,000 remain. All 14,000 came in at Rs 200, so closing inventory is Rs 28,00,000 and the cost consumed is Rs 1,76,50,000 less Rs 28,00,000, or Rs 1,48,50,000. First-in-first-out is the rule Anjani Stationers applies, so those two figures are the published pair.

The rule is a cost flow assumptionA stated convention about the order in which costs are treated as leaving, used because money has no serial number and identical goods cannot be told apart. The assumption makes no claim about which physical items moved. and it makes no claim whatever about which physical reams left the building. The distinction is where readers most often quietly go wrong. Nobody at Anjani Stationers walks into the godown and pulls from the back of the stack. The reams are identical, the storeman takes whatever is nearest, and the accounting rule runs entirely on paper. A household topping up its rice tin works the same way: new rice goes in on top of old rice, the household eats from the top, and nobody could say whether Tuesday's dinner came from the sack bought in June or the one bought in August. First-in-first-out settles which price the accounts attach to what is left, and nothing at all about the grains.

How does the Weighted Average Cost Method work, step by step?

The Weighted Average Cost Method refuses to track layers at all. The method takes everything that was available during the year, adds up what all of it cost, divides by how many units there were, and treats every single unit as having cost that one blended rate. No unit is special, no purchase is remembered, and after the first purchase of the year not one ream on the books is carried at a price anybody ever actually paid.

Worked on Anjani Stationers, with the division set out rather than asserted. Add the four layer costs, Rs 19,00,000 plus Rs 61,50,000 plus Rs 66,00,000 plus Rs 30,00,000, and the total cost available is Rs 1,76,50,000. Add the four quantities, 10,000 plus 30,000 plus 30,000 plus 15,000, and the total units available are 85,000 reams. Divide: Rs 1,76,50,000 over 85,000 gives Rs 207.6470588 a ream, quoted as Rs 207.65. Every ream is now assumed to have cost that rate. Multiply by the 14,000 reams still held and closing inventory comes to Rs 29,07,059. The counterfactual column is rounded to the nearest thousand rupees throughout, to the same precision as the published one, so the figure is stated as Rs 29,07,000. The cost consumed is then Rs 1,76,50,000 less Rs 29,07,000, or Rs 1,47,43,000, and gross profit would have been Rs 1,22,57,000.

The Weighted Average Cost Method therefore reports Rs 1,07,000 more gross profit than first-in-first-out on precisely the same purchases, the same reams and the same sales. One further wrinkle belongs here because it catches people out. The version worked above recomputes the average once, over the whole year. A business counting its stock at the year end does exactly that. A business running a perpetual inventory systemA stock system that updates the recorded quantity and value continuously as goods move, rather than establishing them by counting at the period end. recomputes the average after every single purchase, so the rate applied to a January issue differs from the rate applied to a November one. Both are the weighted average costA blended rate found by dividing the total cost of goods available by the total units available, so that every unit is treated as having cost the same amount. method and both are permitted, and they do not give identical answers. Anyone reconstructing another business's figures has to establish which of the two it runs before assuming that the arithmetic will reproduce the published one.

Which formula left less on the shelf here, and why is the textbook rule wrong?

Put the two answers next to each other and something uncomfortable happens. First-in-first-out put Rs 28,00,000 on the balance sheet. The Weighted Average Cost Method would have put Rs 29,07,000 there. First-in-first-out gave the LOWER closing inventory, the HIGHER cost and therefore the LOWER reported profit. Most people carry exactly the opposite direction in their heads.

The reason is not subtle once the prices are looked at rather than the rule. Paper went from Rs 190 to Rs 205 to Rs 220, and then eased back to Rs 200. First-in-first-out puts the LATEST price on the balance sheet, and the latest price is Rs 200. The Weighted Average Cost Method puts the AVERAGE price there, and the average is Rs 207.65. Rs 200 is below Rs 207.65, so the first-in-first-out shelf is valued at the lower rate. The comparison of those two rates is the whole mechanism. Nothing else is involved.

The mistake is the single most commonly mis-taught point in this subject, so name it properly. The rule people memorise is that first-in-first-out gives the higher profit. The memorised rule is a special case, true only because it silently assumes prices always rise. When prices rise, the latest price is above the average, so the newest cost sitting on the balance sheet is the expensive one and profit comes out higher. The honest statement is that the direction depends on where the latest price sits against the average, and on nothing else at all. Prices ease at the end of a year all the time, whether because a season turned, a mill cleared stock, or an input reversed, and every time it happens the memorised rule points the wrong way. The reliable move is not to recall the rule. The reliable move is to look at the last price, look at the average, and see which is bigger. The look takes about four seconds and it never goes wrong.

The two formulas on identical transactions

Here is the whole of Anjani Stationers' year two worked twice, on the same purchases, the same reams and the same revenue. The left column is what the business published. The right column is what the same year would have looked like under the other permitted formula, and it did not happen.

The difference is Rs 1,07,000 of gross profit, and how large that sounds depends entirely on the denominator it is divided by. Against revenue of Rs 2,70,00,000 it is 0.4 per cent, and 0.4 per cent reads as a rounding difference. Against profit before tax of Rs 38,00,000 it is 2.8 per cent, and 2.8 per cent reads as a real number. Both percentages describe the same Rs 1,07,000, so any statement about the materiality of an accounting difference has to name the denominator, or the figure means nothing. On gross margin itself the difference is four tenths of a percentage point, from 45.0 to 45.4.

Three readings from the slider settle the claim. At the actual price of Rs 200 the first-in-first-out shelf holds Rs 28,00,000 against the weighted average Rs 29,07,000, a gap of Rs 1,07,000 with first-in-first-out reporting less. Drag down to Rs 170 and the gap widens to Rs 4,53,000, still in the same direction. A lower last price pulls the first-in-first-out shelf down faster than it pulls the average down. Drag up instead and the gap shrinks, reaches zero, and then reverses: at Rs 240 the first-in-first-out shelf holds Rs 33,60,000 against a weighted average of Rs 30,06,000 and first-in-first-out now reports Rs 3,54,000 MORE profit, the case every textbook describes. The two formulas agree at exactly one price, Rs 209.29 a ream. At that price purchase three itself equals the weighted average of everything. Below it the memorised rule is backwards; above it the memorised rule happens to be right; and no rule settles which side a given case falls on except looking.

Why Inventory Growth Can Be a Financial Red Flag, and which explanation does the arithmetic pick?

Leave the formulas and look at the size of the balance instead. Anjani Stationers' inventory went from Rs 19,00,000 at the end of year one to Rs 28,00,000 at the end of year two, a rise of 47.4 per cent. Revenue over the same year rose from Rs 2,40,00,000 to Rs 2,70,00,000, a rise of 12.5 per cent. Stock therefore grew close to four times as fast as the trading it supports, and the same movement expressed in days has inventory days going from 52.5 to 68.8, both computed on the cost of materials consumed rather than on revenue.

At least four completely different situations produce exactly this arithmetic, so inventory growing materially faster than revenue is a question worth asking and emphatically not an answer. Here is why the pattern gets attention at all. Unsold goods sit on the balance sheet at cost and never reach the income statement until they are sold, so stock is the one balance a business can inflate without anybody outside noticing. Goods that will never sell look identical, on the face of the accounts, to goods that are about to. The ratio cannot tell them apart, and neither can a reader without more information.

So take the four explanations seriously and, more importantly, take seriously the fact that each one is confirmed by different evidence. The first is seasonal stocking: a stationery business builds paper ahead of a school year, and if the year two count fell closer to the season than the year one count did, the whole movement may be a calendar artefact. The evidence is the stocking calendar and the monthly stock record, and a look at what happened to the balance in the following quarter. The second is a price view: if paper was expected to keep rising, buying early is a commercial decision rather than a problem. The evidence is in the purchase dates and prices. For Anjani Stationers those show buying at Rs 220 followed by a purchase at Rs 200, so whoever took that view was not rewarded. The third is goods that are not selling. The evidence is the ageing of the stock and the split between raw material and finished goods. Raw paper that is slow is a very different situation from finished notebooks that are slow. The fourth is a change of cost formula. A new formula can raise the closing balance without a single extra ream entering the building, and the evidence is one line in the accounting policy note.

Nothing in the arithmetic picks between those four. A 47.4 per cent rise against a 12.5 per cent rise is consistent with all of them, and reading it as though it were evidence for any particular one is the error to avoid. Notice also that Anjani Stationers' gross margin held at exactly 45.0 per cent across both years. The ratio watcher will find that reassuring, and it settles nothing. A business carrying stock it cannot sell reports a perfectly healthy gross margin right up until the moment it writes the stock down.

What ceiling sits above the cost figure?

Everything above has been about arriving at cost. One more rule sits above all of it and is worth naming here, though it is worked separately. Inventory is carried at the LOWER of cost and net realisable valueThe amount a business expects to get for goods in the ordinary course of trade, less what it still has to spend to finish and sell them. Net realisable value is an entity-specific estimate, not a market price.. Cost is the ceiling that the formulas above compute; net realisable value is the ceiling that reality imposes.

The two formulas argue about which cost to use. If the goods will not fetch what they cost, neither cost figure goes on the balance sheet, and the lower-of-cost-and-net-realisable-value rule makes the argument irrelevant. Anjani Stationers' Rs 28,00,000 is a clean cost figure: nothing was written down in year two. But the discipline is worth stating once. Compute the cost carefully, then ask whether the goods are actually worth it, and take the lower of the two.

Who reads the inventory note, and what do they do with it?

Step out of the arithmetic. Three different people open this note in the same week, and none of them is admiring the formula.

A lender reads the closing figure to decide how much of it to lend against, an analyst reads the accounting policy line before comparing any margin with anybody, and Vaidehi Rao reads the split to work out the question to take to the godown on Monday. Watch each of them work, because the same Rs 28,00,000 is doing three different jobs. The lender is sizing stock as security and the first question is not how much stock there is but what kind: raw paper can be sold to another converter, part-bound blocks in a discontinued ruling cannot, and a lender who advances against a total without seeing the split has lent against an average of those two situations. The advance rate actually turns on how fast the stock turns, and 68.8 days against 52.5 days a year earlier is a real change to ask about.

The analyst's use is narrower and more mechanical. Before comparing Anjani Stationers' 45.0 per cent with anybody else's gross margin, the analyst reads one line in the accounting policy note to find out which cost formula produced it. The check takes thirty seconds and, as the failure below shows, skipping it can manufacture an entire percentage point of difference out of nothing. And Vaidehi Rao's use is the most practical of the three. She is not going to change the formula and she cannot make paper cheaper. She can look at inventory days moving from 52.5 to 68.8, ask the godown which of the three categories the extra nine lakh is sitting in, and get an answer the same week. If it is raw paper bought ahead of the season, that is a decision somebody made and can defend. If it is finished notebooks in a ruling that stopped selling, that is a different conversation entirely, and it is one that eventually reaches the write-down rule rather than the cost formula.

Anjani Stationers Private Limited, Chitra Binding Works Private Limited, Vaidehi Rao, the Sunrise Public School group and the second stationery business in the comparison are invented.
Educational material. Not advice on any investment, tax, budget or market position.