Estate Tax Business Valuation: What Makes a Defensible Report
Author: Redwood Valuation Content Team
Published: August 5, 2026
Estate tax business valuation determines the fair market value (FMV) of a closely held business interest for federal estate tax purposes under IRC Section 2031and the applicable Treasury Regulations. Treasury Regulation 20.2031-1(b) defines fair market value as "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." Although the standard may sound straightforward, applying it to a private company with no public market requires careful analysis and experienced judgment.
A defensible valuation must do more than produce a mathematically supportable number. It must explain what was valued, which facts mattered, why particular methods were selected, how the assumptions were developed, and how the analysis led to the conclusion. Without that reasoning, even technically sound calculations can be difficult to defend under IRS examination.
The quality of the valuation is therefore more than a procedural concern. It can directly affect the estate’s tax liability, penalty exposure, and ability to defend the reported value.
This guide explains the regulatory framework for estate tax business valuations, the three valuation approaches, discount analysis, compliance requirements, and the penalties that make careful valuation work important. Whether you are planning ahead or administering an estate that includes business interests, understanding how the conclusion is supported matters at least as much as understanding the formulas behind it.
The Current Estate Tax Landscape
Under the One Big Beautiful Bill Act signed July 4, 2025, the federal estate and gift tax basic exclusion amount is $15 million per individual for 2026. A married couple may shelter up to $30 million, but the combined amount depends on each spouse's available exclusion, prior taxable gifts, and, when applicable, a timely portability election for the deceased spouse's unused exclusion. The $15 million amount is permanent under current law and will be adjusted for inflation beginning in 2027 using 2025 as the base year.
The top federal estate tax rate remains 40%. The legislation also left in place the general basis-adjustment rules that apply to many assets acquired from a decedent. For an estate that includes a closely held business, the value assigned to the business interest can directly affect whether an estate tax is due and how much tax must be paid. A business owner with a $20 million estate and a full $15 million exclusion, for example, may have $5 million exposed to estate tax before deductions and other adjustments.
Several states also impose their own estate or inheritance taxes, often at thresholds substantially below the federal exclusion. State considerations are beyond this article's scope, but they can create a valuation need even when no federal estate tax return would otherwise be required.
Revenue Ruling 59-60: The Eight Valuation Factors
Revenue Ruling 59-60remains foundational IRS guidance for valuing closely held business interests for estate and gift tax purposes. Published in 1959, the ruling identifies eight factors that appraisers generally consider and emphasizes that valuation depends on the facts of each case. Its central principle is explicit: "No formula can be devised that will be generally applicable to the multitude of different valuation issues."
The eight factors are:
The nature of the business and its history
The economic outlook and condition of the specific industry
The book value of the stock and the company's overall financial condition
The earning capacity of the business
The dividend-paying capacity
Whether the business has goodwill or other intangible value
Sales of the stock and the size of the block to be valued
The market price of stocks of corporations engaged in the same or a similar line of business
No single factor is determinative. A profitable manufacturing company with 30 years of operating history may require a different analytical emphasis from a five-year-old technology services firm. Revenue Ruling 59-60 calls for informed professional judgment rather than mechanical application of a formula. A defensible report explains how the appraiser weighed the relevant facts and why that judgment made sense for the specific business and ownership interest.
The Three Valuation Approaches
Appraisers commonly consider three approaches when valuing a closely held business interest for estate tax purposes: the income approach, the market approach, and the asset approach. The appraiser should evaluate which approaches and methods are relevant, but not every approach needs to be used in every engagement. The selection depends on the nature of the business and the quality of the available information.
The income approach values a business based on the economic benefits it is expected to generate. A discounted cash flow analysis projects future cash flows and discounts them to present value using a rate that reflects the risk of achieving those projections. When the analysis values invested capital, the discount rate may be a weighted average cost of capital (WACC). A capitalized earnings or cash flow method may be more appropriate when normalized results are stable and a single representative period can reasonably reflect expected performance.
The market approach uses evidence from comparable public companies or transactions involving similar businesses. Strong market evidence can provide an important indication of value, but private companies rarely have perfect comparables. Differences in size, growth, profitability, customer concentration, products, geography, and capital structure may require adjustments and can limit the weight placed on the results.
The asset approach estimates value by adjusting the company's assets and liabilities to reflect their current values. It is often most useful for holding companies, investment entities, real estate companies, and other asset-intensive businesses. It may also provide useful information for an operating company when the asset base is important to the economics of the business. Separate specialists are often needed to value real estate, machinery, equipment, or other significant assets.
Before applying these methods, the appraiser often considers whether the historical financial statements require normalization. These adjustments address nonrecurring items or amounts that do not reflect ongoing market economics. Above-market compensation, below-market rent, unusual owner expenses, and related-party transactions may all warrant analysis. The appropriate adjustment depends on the facts, the valuation purpose, and the rights attached to the interest being valued. An adjustment available to a controlling owner may not be equally available to a noncontrolling investor.
The final step is to reconcile the indications of value. The appraiser considers the reliability of each result rather than averaging them mechanically. Strong comparable-company evidence may support greater reliance on the market approach. By contrast, forecasts created primarily for the valuation may reduce reliance on a discounted cash flow analysis when the supporting evidence is limited. The report should explain these judgments clearly enough that a reviewer can follow the path from the underlying information to the final conclusion.
Valuation Discounts: DLOM and DLOC
Two discounts commonly considered for interests in closely held businesses are the discount for lack of marketability (DLOM) and the discount for lack of control (DLOC). A DLOM reduces the value of an interest because selling it may take more time, cost more, and be more difficult when there is no active public market. A DLOC reduces the value because an ownership interest is generally worth less when the holder cannot control important business decisions. For example, the holder may be unable to direct distributions, appoint management, or approve other major actions.
Neither discount is automatic. Whether a discount applies and how large it should be depend on the rights, restrictions, financial characteristics, and expected holding period of the specific interest.
When both discounts apply, they are multiplicative rather than additive. A 20% DLOC followed by a 30% DLOM does not produce a 50% combined discount. The calculation is:
1 - (0.80 x 0.70) = 44%
The IRS Discount for Lack of Marketability Job Aiddiscusses restricted stock studies, pre-IPO studies, option models, and other tools used in DLOM analysis. The Job Aid was prepared for IRS valuation professionals and is useful as a reference, but it is not authoritative guidance and does not establish an approved discount range. Courts and the IRS evaluate discounts based on the evidence supporting the particular interest.
A defensible discount analysis usually combines quantitative evidence with a careful review of the legal and economic characteristics of the interest. Relevant considerations may include:
Transfer restrictions in operating, shareholder, or partnership agreements
Voting rights and the ability to influence management
Distribution history and distribution policy
Redemption rights, buy-sell provisions, and available exit opportunities
Expected holding period and prospects for a liquidity event
Financial condition, leverage, and dividend-paying capacity
The size of the interest and the market for comparable investments
A larger combined discount may attract greater scrutiny, but the percentage alone does not determine whether the conclusion is supportable. The report must show how the quantitative evidence and the interest-specific facts work together.
Estate of Anne Milner Fields v. Commissioner illustrates the broader risk when the underlying planning lacks substance. In 2024, the Tax Court held that approximately $17 million transferred to a family limited partnership during the final weeks of the decedent's life had to be included in the gross estate under IRC Section 2036. That provision can bring transferred property back into the estate when the decedent retains its economic benefits or certain control rights. The bona fide sale exception did not apply because the transfers lacked a legitimate and significant non-tax reason and did not qualify as genuine arm’s length transfers for adequate consideration. The Fifth Circuit affirmed the decision in June 2026.
Because the transferred assets were included in the estate rather than the discounted partnership interest, the estate lost the benefit of the claimed DLOC and DLOM. The case shows why valuation discounts cannot rescue a transaction whose timing, purpose, and implementation do not withstand scrutiny.
Appraisal and Compliance Requirements
For federal estate tax purposes, IRC Section 2031 and the applicable Treasury Regulations establish the fair market standard. Treasury Regulation 20.2031-1(b) establishes the fair market value, while additional regulations address the valuation of closely held stock and other business interests. Estate tax law does not generally require a "qualified appraisal" under the charitable-contribution rules. Even so, a comprehensive appraisal from an independent professional with relevant business valuation education and experience is often the clearest way to support the value reported on Form 706.
The report should identify the valuation date, the interest being valued, the applicable standard of value, the information considered, the methods applied, the assumptions used, and the reasoning supporting the conclusion. Depending on the engagement and the appraiser's professional obligations, the work may also follow the Uniform Standards of Professional Appraisal Practice (USPAP) or the standards of a recognized valuation organization. Whether an appraiser must comply with USPAP depends on applicable law, professional obligations, or the terms of the engagement.
The "qualified appraisal" and "qualified appraiser" rules in Treasury Regulation 1.170A-17 were developed for charitable-contribution deductions under IRC Section 170. Although those rules do not govern estate tax valuations, they remain a useful reference point for appraiser qualifications, independence, and documentation. The report must still satisfy the requirements and purpose of the estate tax engagement itself.
For estate tax reporting, the return must accurately identify the property and include the supporting information required by the applicable schedule. Stock in an inactive or closely held corporation is generally reported on Schedule B. Partnership interests, unincorporated businesses, and most limited liability company interests are generally reported on Schedule F unless a different schedule applies because of joint ownership or another specific circumstance.
The Form 706 instructions require complete financial and other data used to determine the value of closely held stock, including relevant balance sheets and five years of earnings or operating results. For partnerships and unincorporated businesses, the instructions similarly require statements of assets and liabilities and net earnings for the valuation date and the preceding five years. When a valuation discount is claimed for a partnership, unincorporated business, limited liability company, or closely held corporation, the instructions also require an attachment identifying the total effective discount.
Estate and gift tax returns are subject to different limitation rules. For estate tax, the general assessment period is three years after the return is filed. One important exception can extend it to six years when omitted items exceed 25% of the gross estate reported on the return.
Gift tax works differently. For lifetime transfers reported on Form 709, the adequate-disclosure requirements in Treasury Regulation 301.6501(c)-1(f) can determine whether the assessment period begins to run for the disclosed gift. Those rules do not set the limitation period for estate tax returns. Executors and advisors should work with estate tax counsel to determine the filing and disclosure requirements for the specific return.
Buy-sell agreements add another layer of complexity. Under IRC Section 2703, the IRS may disregard an option, agreement, right or restriction that fixes or limits the price at which property may be acquired unless it satisfies three requirements:
It is a bona fide business arrangement.
It is not a device to transfer property to family members for less than full and adequate consideration.
Its terms are comparable to similar arrangements entered into by persons in an arm's-length transaction.
An agreement that fails this test may still govern the parties as a matter of contract law, but it may not control the value reported for federal transfer tax purposes.
The executor may also elect alternate valuation under IRC Section 2032. The election is available only if it reduces both the value of the gross estate and the combined estate and generation-skipping transfer taxes payable because of the decedent's death. Property still held by the estate is generally valued six months after death. Property distributed, sold, exchanged, or otherwise disposed of during that period is generally valued as of the date of disposition on the earlier disposition date. For an estate holding a business interest that declines in value after death, the election may provide meaningful tax savings, but it applies to the estate as a whole rather than to selected assets.
Penalty Exposure: IRC 6662 and IRC 6695A
IRC Section 6662 imposes a 20% accuracy-related penalty for an estate or gift tax valuation understatement when the value reported is 65% or less of the correct value. If the reported value is 40% or less of the correct value, the penalty increases to 40% under IRC Section 6662(h). The underpayment attributable to the misstatement must exceed $5,000 before either penalty applies.
IRC Section 6695A can also impose a separate penalty on an appraiser who prepares an appraisal used in connection with a return or refund claim. The penalty can apply when the appraisal results in a substantial or gross valuation misstatement and the appraiser knew or reasonably should have known that the appraisal would be used for that purpose. The potential exposure reinforces the importance of independence, relevant expertise, and supportable analysis, but it does not mean that every disputed valuation creates automatic appraiser liability.
Under IRC Section 6664(c), reasonable cause and good faith may provide a defense to an accuracy-related penalty. The analysis depends on all the facts and circumstances, including the taxpayer's effort to determine the correct liability and the quality and objectivity of any professional advice. Hiring an appraiser or tax advisor does not by itself establish the defense. The estate should be able to show that the relevant facts were provided, the professional was appropriately qualified for the assignment, and the reported position was based on a reasoned analysis rather than an unsupported conclusion.
The Fields decision discussed above also shows the limits of the reasonable-cause defense. The court affirmed a 20% accuracy-related penalty after concluding that the estate had not shown it acted with reasonable cause and in good faith. Professional involvement did not cure a reporting position that the court found should have appeared too good to be true in light of the facts.
Working with an Experienced Appraiser
Engaging an appraiser early in the estate planning process generally produces better results than rushing to complete a valuation after death or shortly before a planned transfer. In Redwood's practice, gift and estate business valuations typically take four to six weeks after the appraiser receives the requested information. The timeline varies with the complexity of the business, the quality of the records, the availability of management, and the extent of any normalization or discount analysis.
The documentation commonly requested includes:
Five years of financial statements and tax returns
Current interim financial statements
Operating, shareholder, or partnership agreements
Capitalization and ownership information
Details on compensation, rent, and related-party transactions
Buy-sell or redemption agreements
Budgets, forecasts, and supporting assumptions
Information about key personnel, customers, suppliers, and management structure
A formal engagement may also include management interviews, site visits where useful, industry and economic research, analysis under more than one valuation method, and review of the legal rights attached to the interest. This work helps the appraiser explain not only the final number but also why the selected methods and assumptions fit the facts as they existed on the valuation date.
Redwood's gift and estate valuation engagements are generally performed on a fixed-fee basis, so the engagement cost is known before the work begins. A thorough report cannot guarantee agreement from the IRS, but it gives the estate a coherent, well-documented position that can be evaluated and defended if questions arise later.
Frequently Asked Questions
What is the estate tax exemption in 2026?
The federal estate and gift tax basic exclusion amount is $15 million per individual for 2026. A married couple may use a combined $30 million, depending on each spouse's remaining exclusion, prior taxable gifts, and, where applicable, a timely portability election. The amount is permanent under current law and is scheduled to be adjusted for inflation beginning in 2027.
What are the three valuation approaches for estate tax?
The income approach values the expected economic benefits of the business through methods such as discounted cash flow or capitalized earnings. The market approach uses evidence from comparable public companies or transactions. The asset approach estimates value by adjusting the company's assets and liabilities to reflect their current values. The appraiser evaluates which approaches are relevant and reconciles the resulting indications based on the reliability of the underlying information.
Can a 409A valuation be used for estate tax purposes?
A 409A valuation should not be assumed to satisfy an estate tax valuation need. A 409A report generally values common stock for equity compensation compliance. By contrast, an estate tax engagement may involve a different valuation date, ownership interest, purpose, scope, and set of legal rights. An existing 409A analysis may contain useful information, but it should be evaluated and, when necessary, updated or expanded by an appraiser familiar with estate and gift tax valuation.
What penalties apply to estate tax valuation errors?
IRC Section 6662 generally imposes a 20% accuracy-related penalty when the reported value is 65% or less of the correct value and the resulting underpayment exceeds $5,000. The penalty increases to 40% when the reported value is 40% or less of the correct value. IRC Section 6695A may also impose a separate penalty on the appraiser. That penalty can apply when the appraiser knew or reasonably should have known the appraisal would be used in connection with a return or claim that resulted in a substantial or gross valuation misstatement.
How long does an estate tax business valuation take?
In Redwood's practice, a standard gift or estate business valuation generally takes four to six weeks after all requested information has been received. The timeline depends on business complexity, data availability, the need for specialist appraisals, and the extent of normalization and discount analysis. Preparing the financial statements, tax returns, governing agreements, ownership records, and forecasts before the engagement begins can reduce delays.