Quick Answer: Fair market value (FMV) is the price a business would change hands at between a willing buyer and a willing seller, both fully informed and neither under pressure to act. Defined by IRS Revenue Ruling 59-60, FMV is the standard of value used in most tax, estate, and valuation contexts, and is not the same as the price a specific strategic buyer might pay.
What Is Fair Market Value?
Fair market value is the most widely used standard of value in business valuation. It comes from a specific legal definition, written by the IRS in Revenue Ruling 59-60 and codified in Treasury Regulation §20.2031-1(b):
“The price at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell, and both having reasonable knowledge of relevant facts.”
That single sentence does a lot of work, and the assumptions inside it shape the entire analysis:
- Hypothetical parties. The willing buyer and willing seller are not specific, real people. They are hypothetical market participants. The actual buyer who might pay you a premium because of synergies, or the actual seller who might accept a discount because of a cash crunch, does not establish FMV.
- No compulsion. Neither party is forced to transact. A distressed sale below market, or an urgent buyer overpaying, does not reflect FMV.
- Reasonable knowledge. Both parties are assumed to have access to the same complete, accurate information about the business and its market.
- Cash or equivalent. FMV assumes payment in cash or its equivalent at a single point in time.
- Reasonable marketing period. The business is assumed to have been on the market long enough to attract genuine, informed buyers.
These assumptions explain why an FMV figure often surprises owners. It is not the “street price” a real buyer might pay; it is the price the market, in the abstract, would arrive at.
Why Fair Market Value Matters
FMV is the standard of value the IRS uses, and it is the foundation for valuations across most business contexts. You need a defensible FMV figure for:
- Estate and gift tax filings, including the transfer of business interests during life or at death
- Income tax purposes in many transactions
- Charitable contribution deductions above IRS-defined thresholds
- Business succession and ownership transitions, including buy-sell agreements and family transfers
- Divorce settlements and litigation support
- Most business sale negotiations, as a baseline reference point
- Equity compensation programs, including the 409A valuations private companies use for stock options
The cost of getting FMV wrong is real. An undervaluation can trigger an IRS challenge, with back taxes, interest, and penalties. An overvaluation can lead to unnecessary tax planning or estate complications. Either way, an FMV figure that does not hold up under scrutiny is a problem.
Fair Market Value vs. Other Standards of Value
FMV is one of several standards of value, and using the wrong one for the wrong purpose can produce a number that is meaningless, or worse, indefensible. The three you are most likely to encounter:
Fair value is a different standard, despite the similar name. In financial reporting under U.S. GAAP, fair value is “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants.” It is used by accountants for financial statements. In a legal context, fair value also appears in dissenting-shareholder disputes and corporate dissolution cases, where state statute defines it, and it typically does not apply discounts for lack of control or marketability the way FMV does.
Investment value is the value of a business to a specific, identified buyer, taking into account that buyer’s synergies, strategic fit, and unique circumstances. This is the number most business owners are thinking of when they imagine selling, because it can be considerably higher than FMV. The classic example: a competitor who could fold your operations into theirs and eliminate duplicate costs may pay a strategic premium that no hypothetical buyer would.
Most probable selling price is the standard often used in main-street business brokerage, reflecting the typical real-world transaction. It tends to fall between FMV and investment value.
Choosing the right standard is one of the first decisions in any valuation engagement. A valuation for an estate tax filing requires FMV. A valuation to inform a sale negotiation may consider FMV alongside investment value. A valuation for a buy-sell agreement should match whatever standard the agreement specifies.
How Fair Market Value Is Determined
FMV is not a single number you look up. It is a conclusion supported by analysis. Revenue Ruling 59-60 itself lists the factors a qualified appraiser must consider, including:
- The nature and history of the business
- The economic outlook of the broader economy and the industry
- The book value of the stock and the financial condition of the business
- The earning capacity of the business
- The dividend-paying capacity
- Goodwill and other intangible value
- Sales of comparable companies’ stock
In practice, that translates into three standard valuation approaches a professional applies when calculating a business valuation, individually or in combination depending on the business:
- Income approach. Values the business based on its ability to generate future earnings or cash flow.
- Market approach. Compares the business to similar companies that have actually sold.
- Asset-based approach. Calculates the net value of the company’s tangible and intangible assets minus liabilities.
A credentialed appraiser, one of the advisors and consultants most often engaged for this work, will choose the right approach (or blend) for the business, apply appropriate discounts (such as for lack of marketability or lack of control, particularly for minority interests), and document the reasoning in a formal report. For tax and legal purposes, that documented reasoning matters as much as the final figure.
Why FMV Often Differs From What an Owner Expects
The single most common reaction to a fair market valuation is that the number feels low. There are a few reasons for this:
FMV ignores synergies. Because the buyer is hypothetical and financial, the analysis strips out the strategic value a real, specific acquirer might bring. That premium is real, but it is not FMV.
FMV applies discounts to minority interests. A non-controlling stake is worth less per share than a controlling one, because a minority owner cannot direct strategy, distributions, or a sale. FMV reflects that.
FMV applies discounts for lack of marketability. Shares in a closely held business cannot be sold in a public market, so they are worth less than an otherwise-identical liquid investment.
The standard is conservative by design. FMV is built for tax and legal contexts where defensibility matters more than optimism. It is not designed to capture what the most enthusiastic buyer might pay on the best possible day.
For owners thinking about a sale, this is a useful clarification rather than a discouragement. FMV is the floor for tax purposes and the reference point for negotiations. The actual sale price often comes in higher, particularly with the right strategic buyer and a well-run process.
How FMV Fits Into a Business Sale
When an owner sells a business, FMV is the foundation, not the ceiling. A well-prepared sale starts with a defensible business valuation that establishes FMV, then works to maximize the gap between FMV and the actual sale price by attracting the right buyers, running a competitive process, and presenting the business in a way that lets strategic value come through.
It is also a forward-looking exercise. The factors that drive FMV (earnings, growth, customer concentration, owner dependence, financial cleanliness) are the same factors an owner can work on in the years before a sale. An early FMV assessment is less about the number and more about the diagnosis: where is the business strong, and where is it leaving value on the table?
That broader view is part of business exit planning, and it is how an FMV figure becomes a starting point rather than a ceiling.
Selling Your Business? Talk With MBO Ventures
Fair market value is one piece of a much larger picture. From understanding what the business is worth today, to weighing the difference between FMV and what a real buyer might pay, to planning the transition itself, the quality of guidance along the way shapes the outcome.
For a wider view of the process, see our guide on how to sell your business.
If a business sale or ownership transition is on your horizon, this year or several years out, reach out to talk through your situation and your options.
FAQs About Fair Market Valuation
What is the definition of fair market value?
Fair market value (FMV) is the price at which a business or property would change hands between a willing buyer and a willing seller, both fully informed and neither under compulsion to act. The definition comes from IRS Revenue Ruling 59-60 and is the standard of value used for most tax, estate, and business valuation purposes.
What is the difference between fair market value and fair value?
Fair market value (used by the IRS for tax purposes) assumes hypothetical buyers and sellers in an open market, and applies discounts for lack of control or marketability where relevant. Fair value (used in GAAP financial reporting and in some state statutes for shareholder disputes) is a different standard with different assumptions and typically does not apply those discounts. The two can produce materially different numbers.
How is fair market value different from what a buyer might actually pay?
FMV assumes a hypothetical, financial buyer with no special synergies. A specific real buyer, especially a strategic acquirer who can combine your business with their own, may pay more than FMV because they see additional value the hypothetical buyer would not. The difference is called investment value or strategic value, and it can be significant.
Who determines fair market value?
For tax and legal purposes, fair market value is determined by a qualified, independent appraiser who follows the factors set out in Revenue Ruling 59-60 and produces a documented valuation report. Owner estimates, rules of thumb, or informal opinions do not meet the standard the IRS or courts require.
Why does my fair market valuation seem lower than I expected?
A few reasons: FMV ignores the synergies a specific strategic buyer might bring, it applies discounts to non-controlling stakes and to illiquid privately held shares, and it is conservative by design because it has to be defensible in tax and legal contexts. The actual sale price of a business often exceeds FMV, particularly with the right buyer and a well-run sale process.
When do I need a fair market valuation?
Common situations include estate and gift tax planning, business succession, buy-sell agreement triggers, divorce or shareholder disputes, charitable contributions of business interests, and as a baseline before going to market in a sale. Whenever a number has to hold up to the IRS or a court, you need a formal FMV.