What Is Fair Market Value?
Fair market value is a legal and appraisal standard rather than a formula. It imagines a hypothetical arm's-length transaction: a buyer and seller who are both knowledgeable about the asset, both acting in their own interest, and both free to walk away. The price such parties would agree on is the FMV, whether or not any actual transaction is occurring.
For publicly traded stocks, FMV is usually just the quoted market price. The standard does its real work for assets without active markets, such as private company shares, family businesses, real estate, and art, where a qualified appraiser must estimate what the hypothetical willing parties would pay. IRS Revenue Ruling 59-60 remains the touchstone guidance for valuing closely held businesses in the US.
How FMV Is Determined
Appraisers typically triangulate FMV using an income approach, most often a discounted cash flow analysis, alongside market-based methods that reference comparable public companies and precedent transactions, with an asset-based or cost approach serving as a check for holding companies and asset-heavy businesses. The appraiser weighs each method based on the asset's nature and the reliability of available data.
Because FMV contemplates the specific interest being transferred, adjustments matter. A minority stake in a private company usually warrants a minority discount for lack of control and a further discount for lack of marketability, which together can reduce value by 20% to 40% relative to a pro-rata share of the whole business. These discounts are among the most litigated topics in tax and estate valuation.
Why It Matters in Practice
FMV determinations carry real money consequences. Startups must obtain independent 409A valuations to set the strike price of employee stock options at or above the common stock's FMV, or employees face immediate taxation and penalties. Estate and gift taxes, charitable deduction claims, and property transactions between related parties all hinge on defensible FMV appraisals that can survive IRS scrutiny.
It also pays to know what FMV is not. Fair value under ASC 820 for financial reporting uses a related but distinct exit-price framework, and statutory fair value in shareholder appraisal disputes often excludes minority discounts entirely. In M&A, a negotiated deal price can exceed FMV because a strategic buyer pays for synergies unique to it. Recognizing which standard of value applies is a mark of sophistication in interviews and on the job.
