Last Updated: March 2026

Fair market value (FMV) refers to the price at which property would change hands between a hypothetical willing buyer and a hypothetical willing seller, both having reasonable knowledge of all relevant facts, neither being under any compulsion to buy or sell, and both acting in their own best interest. This definition, established by the IRS in Revenue Ruling 59-60 and codified in Treasury Regulation Section 20.2031-1(b), is the foundational standard of value for estate tax, gift tax, income tax, and business valuation purposes in the United States. Sofer Advisors, a nationally recognized business valuation firm, applies the IRS fair market value standard across every engagement type, delivering written reports recognized by the IRS, SEC, and federal courts.

Fair market value is the most widely used standard of value in business, legal, and tax contexts in the United States. Yet it is also one of the most frequently misunderstood. Business owners who rely on informal estimates, industry rules of thumb, or non-credentialed advisors to establish FMV expose themselves to IRS challenge, legal disputes, and financial loss. The IRS definition is specific: hypothetical parties, arm’s-length transaction, full information, no compulsion. Each element changes the analysis. Understanding what FMV means, what it does not mean, and how it is determined correctly is foundational to every business valuation, estate plan, and equity compensation program.

Key Takeaways

  • The IRS fair market value definition assumes a hypothetical transaction between hypothetical parties, not the actual buyer and seller in a real transaction.
  • FMV assumes both parties are fully informed, which means any information that a knowledgeable buyer and seller would reasonably consider must be reflected in the concluded value.
  • FMV is the standard of value for estate and gift taxes, 409A valuations, charitable contribution deductions, business succession, ESOP transactions, and most litigation contexts.
  • “Fair value” (used in GAAP financial reporting under ASC 820) and “fair market value” (used by the IRS) are different standards that can produce materially different results.
  • A qualified appraisal from a qualified appraiser is required by the IRS whenever FMV must be formally established for tax returns, deductions, or charitable contributions above specific thresholds.

What Is the IRS Definition of Fair Market Value?

The IRS fair market value definition appears in Treasury Regulation Section 20.2031-1(b), which governs the valuation of property in decedent estates:

“The fair market value is 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.”

This definition has been interpreted by the Tax Court, federal courts, and the IRS in thousands of cases, yielding several important clarifications:

Hypothetical parties: The willing buyer and willing seller are hypothetical market participants, not the actual parties to a specific transaction. The FMV of a business interest is not the price a specific strategic buyer with combined benefits would pay, nor is it the forced liquidation price a distressed seller would accept. No compulsion: Neither party is required to transact. A seller facing a cash emergency who accepts a below-market price does not establish FMV. A buyer with a specific urgent need who overpays above market does not establish FMV.

What Is the Difference Between Fair Market Value and Fair Value?

The distinction between fair market value and fair value causes significant confusion because both terms use “fair” and both relate to property valuation. They are, however, different standards applied in different contexts:

Fair Market Value (IRS/appraisal standard): Uses the hypothetical willing buyer/seller framework. Applies in estate and gift taxes, income tax, 409A, ESOP, charitable contributions, and most litigation. May include minority and marketability discounts for non-controlling private interests. Fair Value (GAAP/ASC 820 standard): Defined as the exit price, the price received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Applies to financial reporting, purchase price allocations, goodwill impairment testing, and equity compensation measurements under ASC 718. Does not inherently include or exclude minority/marketability discounts. Fair Value (state law standard for dissenting shareholders): Defined differently by each state for dissenters’ rights and appraisal proceedings. Many states exclude minority discounts from fair value calculations in oppression or squeeze-out cases, making fair value (state law) higher than FMV in those contexts.

Standard Authority Key Application Minority Discount?
Fair Market Value IRS / Revenue Ruling 59-60 Estate & gift tax, 409A, ESOP, charitable deductions, litigation Yes (DLOC + DLOM typically applied for minority interests)
Fair Value (GAAP) ASC 820 / FASB Financial reporting, purchase price allocation, goodwill impairment, ASC 718 Not inherently included or excluded
Fair Value (State Law) State statutes (varies by state) Dissenters\u2019 rights, shareholder oppression, squeeze-out cases Many states exclude minority discounts (value often higher than FMV)

How Is Fair Market Value Determined for a Business?

FMV of a business is determined using one or more of three primary approaches, as required by Revenue Ruling 59-60:

The income approach values the business based on its capacity to generate future economic benefits. The most common income approach methods are the capitalized cash flow method (dividing normalized earnings by a capitalization rate) and the discounted cash flow method (projecting multi-year free cash flows and discounting at WACC). The income approach is most appropriate for operating businesses with stable earnings histories and predictable growth. The market approach values the business by reference to what buyers have paid for similar businesses. The guideline public company method uses trading multiples of comparable publicly traded companies; the guideline transaction method uses acquisition multiples from comparable private company sales recorded in databases like DealStats. Market approach results reflect the prices that actual market participants have paid, making them a direct read on FMV for going-concern businesses.

What Are Common Contexts Where the IRS FMV Standard Applies?

The IRS FMV standard governs valuation in a wide range of tax and legal contexts:

Estate and gift tax: FMV of all property included in a decedent’s gross estate or gifted during life must be established as of the date of death or date of gift. For closely held business interests, this requires a formal appraisal under Revenue Ruling 59-60. 409A stock option compliance: The strike price of stock options granted by private companies must equal the FMV of common stock on the grant date. The IRS defines FMV using the willing buyer/willing seller standard and requires an independent qualified appraiser for safe harbor protection. Charitable contribution deductions: Donors who contribute property worth more than $5,000 to a charity must obtain a qualified appraisal of FMV to claim the charitable deduction. Business interests above $500,000 require attachment of the appraisal to the tax return.

What Does It Mean That FMV Assumes Hypothetical Parties?

The hypothetical party assumption is one of the most important and most misunderstood elements of FMV. It means that FMV does not reflect:

  • The specific strategic combined benefits a known buyer would realize from the acquisition
  • The specific financial distress of a known seller who must sell quickly
  • Any special relationship between buyer and seller (family member pricing, related party discounts)
  • The investment value (value to a specific investor based on their unique circumstances)

Instead, FMV reflects what a typical market participant, with full information, acting rationally, would pay in an arm’s-length transaction. This is why FMV is often lower than the price a specific strategic buyer pays in a negotiated M&A transaction (which includes combined value premiums) and higher than the forced liquidation price a distressed seller receives (which reflects compulsion).

In estate planning and gifting strategies, the hypothetical party standard enables significant tax savings because the FMV of a minority interest in a closely held business reflects what a hypothetical market participant would pay for that illiquid, non-controlling interest, which is substantially less than the pro-rata enterprise value.

Frequently Asked Questions

What is the IRS definition of fair market value?

The IRS defines fair market value (FMV) in Treasury Regulation Section 20.2031-1(b) as “the price at which 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.” This definition uses hypothetical parties, assumes full information, requires no compulsion, and assumes an arm’s-length transaction. It is the foundational standard for estate and gift taxes, 409A valuations, charitable deductions, ESOP transactions, and most business appraisal contexts.

Is fair market value the same as market value?

Fair market value and market value are often used interchangeably but have subtle differences. Market value (used in real estate appraisal) reflects the most probable price the property would bring in a competitive and open market, given conditions requisite to a fair sale. FMV (used in tax and business appraisal) uses the willing buyer/willing seller standard with the knowledge and no-compulsion elements.

Can a business owner set their own FMV?

No. For IRS and legal purposes, FMV must be established by an independent qualified appraiser. A business owner setting their own FMV has an inherent conflict of interest and does not satisfy the qualified appraisal requirement. For estate and gift tax returns, charitable contribution deductions, ESOP transactions, and 409A compliance, an internally determined value does not meet the IRS standard and will not receive safe harbor protection.

What is the difference between investment value and fair market value?

Investment value is the value of an asset to a specific investor based on that investor’s unique expectations, combined benefits, and risk tolerance. Fair market value uses a hypothetical investor with no special characteristics. Investment value will be higher than FMV when the specific buyer has combined benefits (cost savings, revenue combinations) that a hypothetical buyer would not have.

Does FMV include a minority interest discount?

FMV of a minority interest typically includes a discount for lack of control (DLOC) and a discount for lack of marketability (DLOM) because the hypothetical willing buyer for a minority position in a private company would demand a price reduction to reflect the inability to control distributions, management, and exit timing, and the illiquidity of the position. DLOC typically ranges from 15% to 35%; DLOM from 20% to 35%.

What records must a qualified appraisal include?

Under Treasury Regulation Section 1.170A-17, a qualified appraisal must include: a description of the property, the date of the contribution (or the valuation date), the terms of the agreement, the appraiser’s name, address, and qualifications, the appraiser’s fee structure, the date on which the property was appraised, the FMV on the valuation date, the method used to determine FMV, and the specific basis for the valuation, including any property sales. For business interests, the appraisal must also describe the business, its history, earnings, dividends, and the nature of the interest valued.

What is the standard of value in a shareholder dispute?

The standard of value in a shareholder dispute depends on the jurisdiction. Most states use fair value (as defined by state statute) for appraisal rights and minority shareholder oppression claims. Fair value often excludes minority and marketability discounts, producing a higher per-share value than FMV. Some states use fair market value; others use a hybrid approach. Attorneys and their appraisal experts must identify the correct standard of value before beginning the analysis, because applying FMV in a fair value state or vice versa can result in a materially incorrect conclusion.

How does FMV apply to charitable donations of business interests?

When a business owner donates a minority interest in a closely held company to a charity, the FMV of that interest determines the charitable contribution deduction. The FMV must be established by a qualified appraisal from a qualified appraiser no earlier than 60 days before the donation and no later than the due date of the tax return. The appraisal must comply with IRS requirements under Treasury Regulation 1.170A-17.

How long is an FMV appraisal valid?

An FMV appraisal is valid for the specific valuation date on which it is prepared. For estate tax purposes, the appraisal must reflect FMV as of the date of death. For gift tax purposes, as of the date of the gift. For 409A, the appraisal is valid for 12 months from the measurement date or until a material event occurs. An appraisal prepared for one purpose (e.g., estate tax as of date of death) is not valid for a different purpose (e.g., 409A grant date) without being reclassed and confirmed for that purpose by the appraiser.

Why does the IRS sometimes challenge FMV conclusions?

The IRS challenges FMV conclusions when the appraisal does not satisfy the qualified appraisal standards, when the methodology is unsupported or inconsistent with Revenue Ruling 59-60, when discount rates are outside the reasonable range without adequate justification, when the comparable selection is weak, or when the DLOC and DLOM percentages are at the extreme end of the range without documented support. IRS challenges most commonly target discount rates, discount magnitudes, comparable selection, and the reasonableness of earnings normalization adjustments.

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Executive Summary

Fair market value is defined by the IRS as the price at which property changes hands between a hypothetical willing buyer and seller, both fully informed and acting without compulsion. It is the foundational standard for estate and gift taxes, 409A, ESOP, charitable deductions, and most business valuation contexts. FMV differs from ASC 820 fair value and from state law fair value; using the wrong standard produces a materially wrong result. For business interests, FMV is determined using the income, market, and asset approaches under Revenue Ruling 59-60, with appropriate DLOC and DLOM for minority interests. Sofer Advisors provides qualified appraisals under the IRS FMV standard across all engagement types.

What Should You Do Next?

Whether you are planning an estate transfer, making a charitable gift of business interests, setting up a buy-sell agreement, or establishing 409A compliance, the FMV of your business interest must be established by a qualified appraiser following IRS standards. David Hern CPA ABV ASA, founder of Sofer Advisors, and 14 W2 valuation professionals deliver FMV appraisals that satisfy the IRS qualified appraisal standard, with 180+ five-star Google reviews and 15+ years of experience. Know Where Your Business Is Today and Where It’s Going Tomorrow. Schedule your free consultation and discover The Sofer Difference.

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About the Author

This guide was prepared by David Hern CPA ABV ASA, founder of Sofer Advisors – a business valuation firm headquartered in Atlanta, GA serving clients across the United States. David holds dual accreditations as an Accredited Senior Appraiser (ASA) and is Accredited in Business Valuation (ABV), credentials recognized by the IRS, SEC, and FINRA. He also holds the Certified Exit Planning Advisor (CEPA) designation. With 15+ years of valuation experience, David has served as an expert witness in 11+ cases across multiple jurisdictions and built Sofer Advisors into an Inc. 5000-recognized firm with 180+ five-star Google reviews. The firm’s full W2 employee team maintains subscriptions to all major valuation databases and operates under a next business day response policy.

For professional business valuation services, visit soferadvisors.com or schedule a consultation.

This article provides general information for educational purposes only and does not constitute legal, tax, financial, or professional advice, consult qualified professionals regarding your specific circumstances.