Last Updated: March 2026

Fair market value for estate tax purposes refers to the price at which each asset in a decedent’s gross estate would change hands between a hypothetical willing buyer and a hypothetical willing seller, both having reasonable knowledge of all relevant facts and neither being under compulsion to transact, as of the date of the decedent’s death. The executor of the estate is responsible for establishing and reporting the FMV of every asset in the gross estate on IRS Form 706 (United States Estate Tax Return). Sofer Advisors, a nationally recognized business valuation firm, provides qualified estate tax appraisals of business interests, family limited partnerships, and closely held company stock, led by David Hern CPA ABV ASA.

Estate tax is a tax where the cost of getting the valuation wrong is multiplied. On a $10 million undervaluation of a business interest in a taxable estate, the tax on the undervalued amount at 40% is $4 million, plus 20%-40% accuracy penalties, plus interest. The IRS Office of Chief Counsel has consistently prioritized business interest valuation examinations in estate tax cases. Executors who rely on informal estimates, broker opinions, or internally prepared analyses expose the estate to examination risk. A qualified appraisal from a credentialed firm is the only protection that gives the estate the legal presumption of correctness under the tax code.

Key Takeaways

  • Every asset included in a decedent’s gross estate must be reported at its fair market value as of the date of death (or the alternate valuation date six months later, if elected and if it reduces estate tax liability).
  • Business interests, including closely held stock, partnership interests, and LLC memberships, require a qualified appraisal by a qualified appraiser to establish FMV for estate tax purposes.
  • Minority interests in closely held businesses are typically valued with a discount for lack of control (DLOC) and a discount for lack of marketability (DLOM), often reducing the taxable per-share value by 30%-50%.
  • The estate tax exemption for 2026 is $13.61 million per individual ($27.22 million for married couples); estates above this threshold pay federal estate tax at a 40% marginal rate.
  • Valuation errors in estate tax returns can result in penalties of 20% (substantial valuation misstatement) or 40% (gross valuation misstatement) of the underpaid tax, in addition to the tax itself.

What Must Be Included in an Estate Tax Valuation?

The gross estate for federal estate tax purposes includes virtually all property in which the decedent had an ownership interest at the time of death, including:

  • Cash, bank accounts, and investment portfolios (valued at date-of-death market prices)
  • Real estate (valued at fair market value based on appraisal)
  • Closely held business interests (stock, partnership interests, LLC memberships)
  • Retirement accounts (IRA, 401(k), pension plan balances)
  • Life insurance proceeds payable to the estate
  • Annuities
  • Jointly owned property (the decedent’s proportionate share)
  • Transfers made within three years of death in certain circumstances

Of all these asset categories, closely held business interests typically require the most complex valuation analysis because they lack observable market prices. For large estates where business interests represent a significant portion of value, the business valuation conclusion often determines whether estate tax is owed and in what amount.

What Is a Qualified Appraisal for Estate Tax Purposes?

A qualified appraisal for estate tax is a formal written appraisal that meets the requirements of Treasury Regulation Section 20.2031-1 and related IRS guidance. For business interests, the appraisal must:

  • Be performed by a qualified appraiser with recognized credentials (ABV, ASA) and relevant experience in valuing the type of business interest
  • Reflect the fair market value standard (hypothetical willing buyer/willing seller)
  • Be dated no earlier than the date of death and no later than the due date of the estate tax return (including extensions)
  • Apply Revenue Ruling 59-60 as the governing framework, considering all eight factors
  • Document the valuation methodology, comparables used, and all significant assumptions
  • Be signed by the appraiser under penalties of perjury

The estate tax return (Form 706) must include the appraisal as a supporting document. Failure to attach a qualifying appraisal for a business interest above threshold amounts can result in penalties and an increased audit risk.

How Are Business Interests Valued for Estate Tax?

Business interests in a decedent’s estate, including closely held corporation stock, partnership interests, and LLC membership units, are valued using the same three-approach framework required by Revenue Ruling 59-60: income approach, market approach, and asset approach. The income approach for an estate tax valuation applies normalized earnings of the business, adjusted for any unusual items in the years surrounding the date of death, discounted or capitalized at a WACC that reflects the risk profile of the business as of the valuation date. The market approach references comparable public company trading multiples and private company transaction multiples from the period surrounding the date of death. Market conditions at the date of death are particularly relevant; a valuation dated during a market change must reflect those conditions, even if the business later recovers in value. The asset approach restates the net assets of the business to fair value, which is particularly important for holding companies and real estate entities where the assets rather than earnings drive the value. After concluding an enterprise value, the appraiser applies any applicable discounts:

Asset Type Valuation Method Typical Discount
Publicly traded stock Market price on date of death None
Business interests Income or market approach DLOM 15-35%
Real estate Comparable sales, appraisal None typically
Partnership/LLC interests Net asset value DLOC 10-25%
Life insurance Cash surrender value None

The DLOC (discount for lack of control) applies when the interest valued is a minority position. The DLOC for estate tax purposes typically ranges from 15% to 35%. The DLOM (discount for lack of marketability) applies to reflect the illiquidity of the private company interest.

What Is the Alternate Valuation Date and When Should It Be Elected?

The executor may elect to value the estate’s assets at the alternate valuation date, which is six months after the date of death, if two conditions are met: (1) the election reduces the gross estate value and (2) the election reduces the estate tax liability. The alternate valuation date election applies to all assets in the estate, not selectively to only certain assets.

The alternate valuation date may be beneficial when:

  • Asset values have declined significantly in the six months following death (e.g., a business interest whose value dropped due to market conditions or loss of a key contract)
  • Publicly traded securities in the estate have declined in value

It is not available when the estate would not qualify for estate tax (below the exemption threshold) even without the election, and it cannot selectively apply to specific assets.

The decision to elect the alternate valuation date requires coordination between the executor, the estate attorney, the CPA, and the valuation appraiser.

How Do Family Limited Partnerships Affect Estate Tax Valuation?

Family Limited Partnerships (FLPs) and Family Limited Liability Companies (FLLCs) are estate planning structures that hold family assets, typically a business interest or investment portfolio, in a partnership or LLC. Limited partnership interests transferred to family members typically receive both DLOC and DLOM, because limited partners cannot manage the assets, vote to liquidate, or easily transfer their interests. The IRS has extensively challenged FLP and FLLC valuation discounts in estate tax cases, arguing that the structures lack economic substance or that Section 2036(a) applies to bring the assets back into the gross estate at their full undiscounted value. Courts have generally upheld FLP discounts when the entity was properly formed, had a legitimate non-tax business purpose, and was maintained according to its terms.

Frequently Asked Questions

What is the date of death valuation for estate tax?

The date of death valuation requires that every asset in the decedent’s gross estate be valued at its fair market value as of the exact date of death. For publicly traded securities, the FMV is the average of the high and low trading prices on the date of death. For closely held business interests, a formal appraisal must be performed by a qualified appraiser as of the date of death, applying the IRS fair market value standard and Revenue Ruling 59-60.

How does the estate tax exemption work in 2026?

The federal estate tax exemption for 2026 is $13.61 million per individual, adjusted for inflation. Married couples can combine their exemptions (portability election) for an effective exemption of $27.22 million. The Tax Cuts and Jobs Act of 2017 doubled the exemption from approximately $5.49 million, but the higher exemption is scheduled to sunset after December 31, 2025, reverting to approximately $7 million (inflation-adjusted) unless Congress acts. Estates exceeding the applicable exemption pay federal estate tax at a 40% marginal rate on the taxable estate.

What is the penalty for undervaluing a business in an estate?

The IRS imposes accuracy-related penalties for valuation errors in estate tax returns. A substantial valuation misstatement (where the FMV is 65% or less of the correct FMV) results in a 20% penalty on the underpaid tax. A gross valuation misstatement (where the FMV is 40% or less of the correct FMV) results in a 40% penalty. Both penalties are in addition to the additional estate tax and interest owed.

Does a small business interest need a formal appraisal for estate tax?

Yes, for any estate that is above or near the federal estate tax exemption threshold and includes a business interest, a formal qualified appraisal is required. Even for estates below the exemption threshold, a formal appraisal may be needed if the estate includes a business interest that is gifted to a charity, if a step-up in basis is important for the heirs, or if a state estate tax applies at a lower exemption threshold.

Can I use the book value of a business for estate tax?

No. Book value is the historical cost basis of assets on the balance sheet, not their fair market value. Revenue Ruling 59-60 explicitly lists “the book value of the stock and the financial condition of the business” as one of eight factors to consider, but it does not equate book value with FMV. For most operating businesses, FMV exceeds book value because book value does not capture goodwill, going concern value, or the fair value of assets that have appreciated since they were acquired.

How is a family partnership interest valued for estate tax?

A family limited partnership (FLP) or LLC interest valued for estate tax is treated as a minority interest in the underlying entity. The appraiser values the underlying partnership assets at fair value, applies the limited partner’s percentage ownership, and then applies DLOC and DLOM to reflect the limited partner’s inability to control distributions, manage the assets, or easily liquidate the interest.

What is the marital deduction and how does it affect estate valuation?

The marital deduction allows an estate to deduct the full value of assets transferred to a surviving US citizen spouse from the gross estate, eliminating federal estate tax on those transfers. The marital deduction does not affect the FMV determination; assets still must be reported at FMV on Form 706. The deduction simply reduces the taxable estate. Assets transferred at death to a non-citizen surviving spouse do not qualify for the unlimited marital deduction; they may qualify for a qualified domestic trust (QDOT) deduction instead.

Can estate tax valuation discounts be challenged by the IRS?

Yes. The IRS commonly challenges DLOC and DLOM percentages in estate tax examinations, particularly when the discounts are at the high end of the typical range or when the underlying analysis is insufficiently documented. The IRS may also challenge the methodology used to value the underlying enterprise, including the discount rate selection, the comparable company analysis, and the earnings normalization adjustments.

How does Sofer Advisors support estate tax valuations?

Sofer Advisors provides qualified appraisals of closely held business interests, family limited partnership interests, and LLC membership units for estate tax purposes. Every engagement delivers a signed written report that satisfies IRS qualified appraisal requirements, applies Revenue Ruling 59-60, documents the income, market, and asset approaches with appropriate weight, and supports DLOC and DLOM with market evidence. David Hern CPA ABV ASA, the founder, holds dual ABV and ASA credentials and has 15+ years of experience in estate and gift tax valuations.

What happens if the estate does not get an appraisal for a business interest?

If the estate does not obtain a qualified appraisal for a business interest reported on Form 706, the estate has no protection against IRS substitution of the IRS’s own valuation in an examination. Without an independent qualified appraisal, the estate bears the burden of proving FMV in any challenge. The IRS examiner will use their own resources to determine an FMV, which may be significantly higher than what the estate reported if discounts were claimed without support.

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Executive Summary

Estate tax requires that every asset in the decedent’s gross estate be reported at fair market value as of the date of death, using the IRS willing buyer/willing seller standard. Business interests require a qualified appraisal under Revenue Ruling 59-60, applying the income, market, and asset approaches. Minority interests receive DLOC and DLOM discounts that can reduce the taxable value by 35%-50%. Valuation misstatements carry penalties of 20%-40% on top of the additional tax. Sofer Advisors provides qualified estate tax appraisals of business interests, family limited partnerships, and LLC membership interests, signed by David Hern CPA ABV ASA and prepared in compliance with all IRS requirements.

What Should You Do Next?

Executors and estate attorneys who need a business interest valued for an estate tax return have a legally mandated timeline and a high-stakes outcome. An error in the FMV conclusion can cost the estate hundreds of thousands of dollars in additional tax and penalties. David Hern CPA ABV ASA, founder of Sofer Advisors, and 14 W2 valuation professionals have completed estate tax valuations for business interests of all sizes and types across all 50 states. Schedule your free consultation and put The Sofer Difference to work for your estate.

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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.