Book value and market value measure a company’s worth from two different angles, and they rarely agree. Book value is an accounting figure pulled from the balance sheet: total assets minus total liabilities, based on what was originally paid for those assets. Market value is what a buyer would actually pay for the company or asset today. The comparison of book value vs. market value matters because the gap between them often tells you more about a business than either number alone: appreciation the books ignore, brands and know-how the ledger never records, and expectations the market has already priced in.
What Book Value Actually Measures
Book value equals a company’s total assets minus its total liabilities, the same figure that appears as shareholders’ equity on the balance sheet. It represents the net worth a company reports to the world: cash, equipment, inventory, property, and recorded intangibles, less loans, accounts payable, and other debts. Public companies disclose these figures in annual Form 10-K and quarterly Form 10-Q filings with the SEC, all available through the EDGAR system.1U.S. Securities and Exchange Commission. Exchange Act Reporting and Registration
Under Generally Accepted Accounting Principles, most assets are recorded at historical cost, meaning the original price paid to acquire them, including related expenses like sales tax, freight, and installation.2Internal Revenue Service. Publication 551, Basis of Assets A piece of equipment bought for $500,000 a decade ago still sits at that original price on the balance sheet, no matter what it could sell for today. This backward-looking approach keeps records consistent and verifiable. It also means the balance sheet can badly understate, or occasionally overstate, what assets are actually worth in the current market.
Depreciation Shrinks Recorded Value Over Time
Accounting rules require companies to systematically reduce the recorded value of their assets. Depreciation applies to tangible property like buildings, machinery, and vehicles. Amortization does the same job for intangible assets like patents, copyrights, and certain software.3Internal Revenue Service. Publication 946, How To Depreciate Property A delivery truck bought for $60,000 might be depreciated over five years until its book value reaches zero, even if the truck still runs and would sell for $15,000 on the used market.
What the Balance Sheet Leaves Out
Not everything valuable a company owns shows up as an asset. Intangibles acquired through a purchase, such as patents bought from another company or goodwill recognized in an acquisition, are recorded. Intangibles a company builds internally generally are not: brand reputation, proprietary processes, customer relationships, a highly skilled workforce. A company with a globally recognized brand worth billions may show no balance sheet entry for that brand because it was built rather than bought. This omission is one of the biggest reasons book value diverges from market value, especially in industries where intellectual property and brand loyalty drive most of the worth.
What Market Value Actually Measures
Market value is what a buyer would pay for an asset or business in the open market right now. It is forward-looking and constantly shifting with investor expectations, economic conditions, and supply and demand. A company’s balance sheet might say it is worth $2 billion; market participants may value it at $10 billion or $500 million based on their read of the future.
Public Companies: Market Capitalization
For a company listed on a stock exchange, market value is expressed as market capitalization: current share price multiplied by total outstanding shares. If a company has 50 million shares outstanding and the stock trades at $80, its market cap is $4 billion. That number moves throughout each trading day as investors react to earnings, news, industry shifts, and broader economic signals.
Private Businesses and Physical Assets
Assets that don’t trade on a public exchange require professional appraisals. Appraisers commonly rely on three approaches: an income approach that discounts projected future cash flows to present value, a market comparison approach that looks at recent sale prices of similar assets, and a cost approach that estimates what it would cost to replace the asset today minus depreciation. Each method can produce a different number, and appraisers often weigh all three. A formal business valuation from a credentialed appraiser typically runs several thousand dollars or more depending on complexity.
Why the Two Numbers Diverge
Book value looks backward at what was paid. Market value looks forward at what is expected. Several specific factors widen the gap between them.
Historical Cost Ignores Appreciation
Because assets stay on the books at their original purchase price minus depreciation, long-held assets can be dramatically understated. A warehouse purchased for $100,000 thirty years ago, and fully depreciated to near zero on the balance sheet, might sell for several million dollars today. The accounting records show almost no value; the market recognizes the property’s current worth based on location, demand, and comparable sales.
Inventory Accounting Choices
How a company accounts for inventory creates another divergence. Under LIFO (last-in, first-out), inventory on the balance sheet is valued at the oldest purchase prices. When costs are rising, the recorded inventory value can be far below what it would cost to replace that inventory today. Under FIFO (first-in, first-out), remaining inventory reflects more recent prices and stays closer to current market value. Two companies with identical stockpiles can report very different book values simply because of this choice.
Unrecorded Intangibles
Internally developed intangibles do not appear as assets. For many modern companies, they are the majority of actual economic value. A software company with minimal physical assets but a dominant market position and recurring revenue will typically show a market value that dwarfs its book value.
Future Earnings Expectations
Investors pay for what a company is expected to earn, not for the depreciated cost of its equipment. Optimism about a new product, expansion into a growing market, or accelerating revenue pushes prices well above book value. A company sitting on valuable physical assets but facing declining demand or regulatory threats may trade below its book value because investors doubt those assets will generate future returns.
Contingent Liabilities
Some real-world liabilities never touch the balance sheet. Pending lawsuits, environmental cleanup obligations, and product warranty claims are recorded as liabilities only when a loss is both probable and measurable. If a loss is possible but not yet likely, it is disclosed in footnotes but not subtracted from book value. Market participants often price these risks into the stock immediately, pushing market value below what the balance sheet suggests.
How the Gap Looks Across Industries
The relationship between book value and market value shifts sharply by industry. Banks and regional lenders tend to trade closer to book value because their assets, mostly loans, cash reserves, and securities, are financial instruments already recorded near fair market value. As of January 2026, regional banks carried an average price-to-book ratio of roughly 1.14, and money center banks averaged about 1.62.4NYU Stern School of Business. Price to Book Ratios by Sector (US) For these companies, book value is a meaningful valuation anchor.
Technology looks nothing like that. Semiconductor firms averaged a price-to-book ratio around 13, software companies averaged roughly 9 to 11, and computer and peripheral companies reached ratios above 30.4NYU Stern School of Business. Price to Book Ratios by Sector (US) These reflect the fact that most of a tech company’s value sits in intellectual property, network effects, and future growth, none of which the balance sheet captures. Book value tells you very little about what the company is actually worth.
Using the Price-to-Book Ratio to Compare Them
The price-to-book (P/B) ratio gives you a quick way to compare the two figures. Divide the current stock price per share by the book value per share. A stock trading at $50 with a book value of $25 per share has a P/B of 2.0, meaning investors are paying twice the recorded net asset value.
A P/B ratio below 1.0 means the stock trades for less than the company’s book value. In theory you could buy the whole company for less than its net assets are worth on paper. Sometimes that signals undervaluation. It can also mean investors see serious problems ahead: declining profitability, coming write-downs, or industry disruption. A low ratio alone is not a buy signal.
A ratio well above 1.0 means investors are paying a premium for things the balance sheet does not capture: growth potential, competitive advantages, management quality, market position. High-growth sectors routinely carry ratios of 5, 10, or higher. The ratio is most useful when comparing companies within the same industry, where balance sheet structures are similar. Comparing a bank’s P/B to a software company’s tells you almost nothing.
How Buybacks Can Distort the Ratio
Share repurchase programs can inflate the P/B ratio in ways unrelated to underlying performance. When a company buys back stock at market price, the cash used leaves the balance sheet, reducing total equity. If the market price is well above book value per share, the reduction in equity is disproportionately large. A company whose market value is five times its book value that repurchases 10 percent of its shares would reduce its book equity by roughly 50 percent.5NYU Stern. Analyzing Cash Returned to Stockholders The stock price might not move much, but the shrinking denominator pushes the P/B ratio sharply higher. Before drawing conclusions from a P/B ratio, check whether the company has been aggressively repurchasing shares.
Tax Implications When You Actually Sell
The gap between book value and market value has direct tax consequences at sale. For tax purposes, the IRS uses “basis,” essentially the recorded cost of your investment adjusted for depreciation, improvements, and other factors.2Internal Revenue Service. Publication 551, Basis of Assets When you sell for more than adjusted basis, the difference is a capital gain and is subject to tax.6Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Long-term capital gains, on assets held longer than one year, are taxed at preferential rates that depend on taxable income and filing status. For 2026, the 0 percent rate applies to taxable income up to $49,450 for single filers, $98,900 for married couples filing jointly, or $66,200 for heads of household. The 15 percent rate applies above those thresholds up to $545,500 for single filers, $613,700 for joint filers, or $579,600 for heads of household. The 20 percent rate applies to taxable income above the 15-percent ceiling.
Short-term gains on assets held one year or less are taxed as ordinary income. Certain categories, including collectibles, qualified small business stock, and unrecaptured depreciation on real property, carry different maximum rates of 25 or 28 percent.6Internal Revenue Service. Topic No. 409, Capital Gains and Losses The larger the spread between depreciated book value and current market value, the larger your potential tax bill on sale.
When Companies Must Write Book Value Down
Book value is generally anchored to historical cost, but companies cannot ignore a permanent drop in an asset’s worth. Under accounting standards, a company must test long-lived assets for impairment when events suggest the recorded value may no longer be recoverable: a sharp decline in the market for its products, a major legal loss, physical damage to a facility.
The test has two steps. First, the company compares the asset’s book value to total cash flows it expects the asset to generate over its remaining life, without discounting to present value. If projected cash flows fall short of book value, the asset is impaired. Second, the company measures the impairment loss as the difference between book value and fair value, then writes the book value down. That write-down flows through the income statement as a loss, reducing reported earnings for the period.
Impairment adjustments only go one way: down. If an asset’s market value later recovers, the company generally cannot write the book value back up under U.S. accounting standards. That one-way ratchet means book value, sometimes overstated relative to market value, can also stay permanently understated after a write-down even when conditions improve.