Book Value: What It Measures and Why It Diverges From Market Value

Book value is the amount the accounting records leave for the owners: assets at their carrying amounts less every liability. Equity is the same figure under another name. Book value almost never equals market value. The records hold many assets at what they cost rather than what they are worth, never record what a business built for itself, and take no view of what the business might earn in future.

Here is what sits underneath that. Accounting measures what happened to the things a business bought and paid for. A market prices what people expect a business to earn. Two different questions produce two different answers, so a difference between the two numbers is the normal state of affairs rather than evidence that somebody made a mistake. The whole skill in reading book value is knowing which question it answers and refusing to ask it the other one.

Computing book value takes one subtraction. The harder work is the four structural reasons the figure diverges from what a buyer would weigh, the kind of business that shows the widest gap before its accounts have even been opened, the questions where book value is the sturdier of the two measures, and why a comparison of the two numbers on its own supports no conclusion in either direction.

What is book value, exactly, and why is it the same number as equity?

Book value is one subtraction. Everything the business holds, at the amount the records carry it at, less everything the business owes. The remainder is book value. Equity has the same definition, so the two words point at exactly the same figure on exactly the same statement, and lenders call it net worth as well. Three names, one number. The reason it has three names is that three different sorts of people arrived at it from three different directions, not that there is any difference between them.

Every asset in that subtraction enters at its carrying amountThe amount at which something is shown on the balance sheet after every adjustment the records require, such as depreciation already charged or a provision already taken., an amount the records arrived at by a rule and not an amount anybody was offered for the thing. A household makes the same calculation. The household lists the flat, the scooter, the gold, the balance in the bank, then lists the home loan and what is still owed on the scooter, and subtracts. Everybody understands that exercise. The only thing that makes the business version harder is the word carrying: the flat goes in at what was paid for it years ago, less nothing, and the scooter goes in at what was paid less the wear already written off, and neither figure is what the flat or the scooter would fetch on a Sunday afternoon. The subtraction is honest. The inputs are records of transactions.

Anjani Stationers, an invented notebook maker, closes year two with assets of Rs 1,80,00,000 and liabilities of Rs 38,00,000. The subtraction gives Rs 1,42,00,000. Rs 1,42,00,000 is the book value. The equity line shows the same Rs 1,42,00,000, made of share capital of Rs 40,00,000 and retained earnings of Rs 1,02,00,000. The two routes to Rs 1,42,00,000 are not a coincidence and not a check somebody ran. A balance sheet is one statement read from opposite ends, and the two routes are those two ends.

Worth pausing on one line inside those assets. Cash is the amount. So cash of Rs 5,00,000 is the only figure on the whole statement where the carrying amount and the worth of the thing cannot possibly differ. Everything else in the list is an amount produced by a rule: the receivables of Rs 95,00,000 gross come down to Rs 86,00,000 after a provision for doubtful debtsAn amount taken off what customers owe, to reflect the part the business no longer expects to collect from them. of Rs 9,00,000, the equipment sits at cost less the depreciation already charged, and the holding in Chitra Binding sits at the Rs 21,00,000 that was paid for it. Book value is the sum of those rules, not a survey of a market.

How does book value become book value per share?

Divide it by the number of shares. The division is the entire computation. The whole figure is a number nobody can hold, and the per share figure is a number attached to the thing an owner actually holds, so the division is worth doing. Anjani Stationers has 4,00,000 shares. Rs 1,42,00,000 divided by 4,00,000 gives Rs 35.50 a share. Nothing more sophisticated is going on, and if the result ever looks sophisticated, somebody has changed the numerator without saying so.

The number that surprises people is not the Rs 35.50 but the face valueThe amount printed on a share when it is issued, which fixes the share capital line. The face value is a legal amount, not a measure of the share's worth. of Rs 10 on the same share. Most of the book value behind each share was never subscribed by anybody. It was earned and kept. The split shows it. Share capital of Rs 40,00,000 across 4,00,000 shares is Rs 10 a share. The Rs 10 is the face value, and the records will show it forever, however the business performs. Retained earnings of Rs 1,02,00,000 across the same 4,00,000 shares is Rs 25.50 a share. The two together come back to Rs 35.50. So roughly seventy two paise in every rupee of book value behind an Anjani Stationers share is profit the business made and did not pay out. For a business that has never declared a dividend, that retained profit is its entire history.

Why does book value almost never equal market value?

Because the two numbers are answers to different questions, and nobody ever intended them to match. Book value answers what was put in and is still there, measured under rules that prefer evidence to opinion. A market price answers what somebody will pay today for the right to whatever the business earns from here. A market price is opinion converted into a number. A quoted share price multiplied by the number of shares gives market capitalisationThe price of one share multiplied by the number of shares in issue, available only where the shares are traded and a price is quoted., and that figure will sit above or below book value on almost every day of its life.

The divergence has four structural causes, and once they can be named the direction of a gap is predictable before a single line of the accounts has been seen. The four are: assets held at what they cost rather than what they are now worth, assets the business built for itself that were never recorded at all, the complete absence of any view about future earnings, and the deliberate caution in the rules that lets losses in early and keeps gains out until they are certain. Three of those four push book value below what a buyer would weigh. The first one can push either way, and that is precisely the reason a gap in either direction proves nothing on its own.

Reason one: the records hold what things cost, not what they are worth

An asset enters the records at historical costWhat was actually paid for something on the day it was bought. The records start from that amount and keep working with it. and then gets reduced by the depreciation charged since. Nobody walks around the premises in March asking what the shelving would fetch. Anjani Stationers carries property, plant and equipment at Rs 36,00,000 net. The Rs 36,00,000 is what was paid for the van, the racks and the cutting and binding machines, less the wear already written off. Whether that equipment would sell for Rs 20,00,000 or Rs 55,00,000 today is a question the records were never designed to answer, and the answer is not written anywhere on the statement.

Held at cost is the only one of the four reasons that can push the gap in either direction. A business trading below its book value therefore settles nothing until the assets themselves have been examined. A godown bought in a quiet lane fifteen years ago is very likely carried far below what it would fetch. A depreciation schedule is written to spread a cost, not to track a market, so a set of printing machines bought three years ago for a job that has since dried up may be carried far above what anybody would pay for it. The same rule produces understatement in one line and overstatement in the next, in the same set of accounts, on the same day.

Reason two: what a business built for itself was never bought, so it was never recorded

The second reason is the largest of the four in most modern businesses, and the easiest to feel. Consider a tiffin service that has run in one neighbourhood for twelve years. Four hundred households know the name and trust the food. Nothing was ever bought and no transaction ever happened, so the accounts have no line for that trust. An internally generatedBuilt up by the business itself over time rather than bought from somebody else, such as a reputation, a customer list grown in house, or a brand name that was never purchased. asset has no cost to record, so the records stay silent.

The proof that this is a rule about transactions and not about substance sits inside Anjani Stationers' own accounts. Goodwill appears there for Rs 3,50,000 only because it was paid for as part of buying into Chitra Binding. Eleven years of custom from the Sunrise Public School group appears nowhere at all. Two assets of the same kind, one recorded because money changed hands and one absent because it did not. The difference is not an inconsistency anybody failed to notice. The rules draw the line there deliberately. A purchase price is evidence somebody can audit. A business's own estimate of its own reputation is not.

Reason three: nothing on a balance sheet is a view about the future

A balance sheet reports a position at a date, assembled from things that have already happened. There is no line called next year, no line for the orders the schools will place in the spring, no line for the fact that the Sunrise Public School group has renewed for five years running. A buyer is purchasing future earnings rather than past purchases, so a buyer weighing the business would spend most of their attention on exactly those things. The statement holds none of it.

In the one place the future does appear on Anjani Stationers' balance sheet, it appears as a liability rather than an asset. The placement shows how the rules think. The Rs 4,00,000 of advances from the Sunrise Public School group for notebooks not yet delivered sits inside liabilities as a contract liability, because the money is held and the work is owed. No obligation and no transaction yet attaches to the far larger prospect, that the same schools will keep ordering for years, so that prospect sits nowhere. Money received against future work is recorded. Future work itself is not.

Reason four: the rules let losses in early and keep gains out until they are certain

Accounting runs on prudenceThe habit in accounting of recognising a likely loss as soon as it becomes likely, while waiting for a gain to be reasonably certain before recognising it at all., a deliberate asymmetry. If a customer looks unlikely to pay, the loss is taken now. If a customer who was written down starts paying again, the recovery is recognised only when it happens. Inventory is carried at the lower of what it cost and what it would realise, so it can be written down and, within limits, not written up beyond its cost. An impairmentA test asking whether an asset is still worth at least the amount the records show, followed by a write down of the carrying amount when it is not. test can lower a carrying amount when an asset stops earning, and there is no matching test that raises one because an asset started earning more.

Anjani Stationers' Rs 9,00,000 provision against receivables is prudence in one line: it lowers book value today for money that may still arrive, and if every school eventually pays in full, no gain was ever sitting in the records in advance. Notice what that does to the direction of the gap. The provision makes the receivables line Rs 86,00,000 rather than Rs 95,00,000, so book value is Rs 9,00,000 lower than a fully optimistic reading would make it. Prudence is a steady, quiet, downward pressure. Prudence rarely dominates the gap, and it is almost always there.

Which businesses show the widest gap, and why?

The businesses where most of what makes them work was built rather than bought. The built or bought test predicts the width of the gap better than size, age, profitability or anything else, and it follows directly from reason two. A cold storage unit is almost entirely bought: land, building, compressors, insulation, all of it purchased, invoiced and recorded. A design studio is almost entirely built: reputation, a client list, the taste and speed of the people who work there, none of it purchased, none of it invoiced, none of it recorded. The cold storage unit's records nearly describe it. The design studio's records barely describe it at all.

The more of a business that was built rather than bought, the smaller the share of it that the accounting records can see, and the wider the gap between book value and anything a buyer would weigh. Anjani Stationers sits toward the bought end, but not at the extreme. Its assets are paper stock, machines, a van, purchased software and money owed by schools, all recorded. The records hold nothing for the eleven year relationship with the Sunrise Public School group, for Meera Rao's knowledge of how to schedule a print run in the two weeks before a school term, or for a name that head teachers recognise. The unrecorded part is real, and it is a minority of the whole, so a stationery maker sits nearer the narrow end of the pattern than a coaching institute does.

At the starting position of 25 per cent built rather than bought, the records hold Rs 1,42,00,000 and the illustrative assessed bar stands at Rs 1,79,00,000, a gap of Rs 37,00,000, of which the largest strip is the Rs 16,00,000 for assets held at what they cost. Push the slider to 60 per cent and the gap widens to Rs 70,00,000, and the largest strip is now the Rs 29,00,000 for what the business built and never recorded. Push it to 100 per cent and the gap reaches Rs 1,31,00,000, larger than the entire book value, with the future earnings strip at Rs 78,00,000 the biggest thing on the screen. Prudence never becomes the largest strip at any setting. Prudence is a steady small understatement rather than a driver of anything, and the strip is drawn to show exactly that. Turn the invented overstatement of Rs 32,00,000 on at the starting position and the gap shrinks from Rs 37,00,000 to Rs 5,00,000; turn it on at 10 per cent built and the assessed bar falls to Rs 1,39,00,000, below the book value bar entirely.

When is book value the more useful number?

More often than the way people talk about it suggests. Start with the fact that most businesses have no market number at all. Anjani Stationers has 4,00,000 shares and not one of them is quoted anywhere; nobody has ever offered a price for the whole. For a private business, book value is not the inferior of two available measures. Book value is the only measured figure that exists, so lenders, courts, tax officers and departing shareholders all reach for it. Its great virtue is not accuracy about worth. Its great virtue is that somebody can check it.

Book value earns its place wherever the question is what is actually there and tested, rather than what somebody expects: lending against assets, testing an asset for impairment, and providing a base to measure a return against. Take the three in turn. A lender advancing against stock and receivables wants amounts that were counted and audited, not amounts somebody hopes for. The whole of an impairment test is a comparison against the carrying amount, so the test starts from the carrying amount by construction. And a return needs a denominator: Anjani Stationers' profit after tax of Rs 30,00,000 against book value of Rs 1,42,00,000 is a return on equity of 21.1 per cent, and that ratio only means anything because the denominator was assembled under rules rather than moods.

How does a lender actually use book value when money is being decided?

Book value is not an idea people admire. Book value is a number people use in rooms where a facility is granted or refused, and a lender reading Anjani Kulkarni's accounts moves through it in a fixed order. None of the four moves treats the number as a measure of the business's worth. All four treat it as a measure of how much of the business's own money is standing in front of the lender's money.

A lender reads book value as a cushion, asks how much of the cushion would survive a bad month, and then writes a floor under it into the loan document as a condition. The first move is direction: Anjani Stationers' book value rose from Rs 1,12,00,000 to Rs 1,42,00,000 in a year, and because no dividend was declared, the whole of the Rs 30,00,000 of profit stayed inside. A business that keeps the whole of its profit is funding itself. The second move is composition: of the Rs 1,42,00,000, some sits in software of Rs 4,00,000 and in a holding in Chitra Binding of Rs 21,00,000. Neither can be sold quickly to repay anybody, so a cautious lender discounts both. The third move is proportion: total borrowing of Rs 12,00,000, being the Rs 6,00,000 term loan and the Rs 6,00,000 lease liability, sits against Rs 1,42,00,000 of book value, about 0.08 times. The fourth is a covenant: a minimum net worth clause, illustratively Rs 1,20,00,000 here, that turns the number into a promise the borrower has to keep.

The steps the lender never took are as instructive as the steps taken. No step in the sequence asked what Anjani Stationers is worth, or compared the book value with anything a buyer might weigh. The number was used as a measure of resilience, a use the records genuinely support. The lender tested it by asking what sits inside it. Once book value is understood as a sum of carrying amounts rather than a survey, what sits inside it is the only question that matters. The gap between book value and what a buyer would weigh is invisible in that room, and correctly so.

What is Anjani Stationers' book value, and what would a buyer weigh that the records never touched?

Here is the whole thing in one place. The left hand column below is the book value, built line by line from carrying amounts, and every figure in it can be traced to a transaction. Read down it and ask, for each row, what the carrying amount is and what it is not. The second question makes the table teach instead of merely list.

A buyer sitting across the table from Anjani Kulkarni would accept every one of those rows. Then the buyer would start a second list, one the records do not contain and were never meant to contain. On that second list: the eleven year relationship with the Sunrise Public School group, which is the reason the order book refills each spring. The name over the door, known to head teachers across the district. Meera Rao's ability to schedule a print run so the notebooks land in the two weeks that matter. The warehouse arrangement at Rs 3,60,000 a year, a commitment in the notes rather than an asset or a liability. The guarantee given for Chitra Binding's Rs 8,00,000 of borrowing, disclosed and not recognised. Some of that second list would raise what a buyer weighs and some would lower it. None of it arrived through a transaction that the rules can measure, so none of it belongs on the balance sheet.

Anjani Stationers Private Limited, Chitra Binding Works Private Limited, Anjani Kulkarni, Meera Rao and the Sunrise Public School group are invented.
Educational material. Not advice on any investment, tax, budget or market position.