Why Fair Market Value Remains Undefined Under IRC § 170

I. Introduction

Charitable donations are often used as a tax loophole under IRC § 170[1] which leads to the key tension of what is “fair market valuation?” When the difference is substantial enough, it raises important questions about how the law evaluates what value counts as a charitable donation.

IRC § 170(a)(1)[2] allows taxpayers to deduct the fair market value of charitable contributions in taxes. However, the statute does not clearly define what “fair market value” means, which creates a gap between taxpayers, appraisers, and the IRS in interpreting this statute. Valuation disputes are common and often lead to different parties reaching substantially different amounts for deductions. Tax law should either clarify the valuation standard or impose stricter requirements.

This article proceeds as follows. Section II sets out the existing legal framework governing charitable contribution deductions under IRC § 170 and the appraisal requirements. Section III analyzes leading cases where valuations were disputed and courts had to determine fair market value. Section IV identifies gaps and inconsistencies in the current approach. Section V proposes reforms.

II. Legal Framework

Federal tax law addresses charitable contributions through IRC § 170[3] which establishes the deduction and methodology for determining deductible amounts. However, the statute defines neither “fair market value” nor the methodology for determining it, instead relying on Treasury Regulations for guidance.

Treas. Reg. § 1.170A-1(c)[4] 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.” For property with an active market, fair market value can be determined by reference to market price. For unique or illiquid property, such as artwork, real estate, or conservation easements, no single correct valuation exists. Instead, fair market value becomes a matter of appraisal and expert opinion.

Recognizing the potential for abuse, Congress enacted appraisal requirements to prevent taxpayers from inflating deduction amounts. Under IRC § 170(f)(11)[5] any charitable contribution of property valued at more than $5,000 requires a qualified appraisal prepared by a qualified appraiser. The appraiser must certify that the valuation meets the requirements of Treas. Reg. § 1.170A-13[6] which specifies the content and scope of qualified appraisals. These requirements include photographs of the property, a description of the property’s condition, comparable sales data or other valuation methodology, and a statement of the appraiser’s credentials.

Despite these procedural safeguards, valuation disputes remain common. The IRS may challenge a taxpayer’s claimed deduction by hiring its own appraiser and presenting a competing valuation. When valuations conflict, the matter often proceeds to Tax Court. The Tax Court must then determine which appraisal is more credible and reliable. Under Treas. Reg. § 1.170A-1(c)[7] the court’s role is to determine the fair market value that would apply at the time of donation, not to validate or invalidate either expert’s methodology.

The problem is evident: if two qualified appraisers using sound methodologies reach different conclusions about fair market value, the statute provides no clear standard for resolving the disagreement. The appraisal requirement shifts the burden of proof to litigation rather than preventing disputes. The statute and regulations establish the process for charitable deductions but do not clarify the substance of how value should be determined when reasonable disagreement exists.

III. Case Law Analysis

Courts have evaluated this key tension in multiple cases, but the outcomes reveal a lack of consistency in how fair market value is determined. In Carter v. Commissioner, T.C. Memo 2023-133[8] the Tax Court encountered a massive valuation disagreement. A partnership donated a conservation easement and claimed a charitable deduction of $14,175,000. The IRS valued the same easement at only $1,000,000. The petitioners’ experts used a 30% reduction methodology, while the IRS expert employed comparable sales analysis. The Tax Court rejected the petitioners’ methodology as unreliable and illogical and accepted the IRS valuation of $1,000,000[9].The case illustrates a fundamental problem: the methodology chosen by an appraiser can determine the outcome, yet the statute provides no guidance on which methodology is appropriate.

In Ames v. Commissioner, 102 T.C. 63 (1994)[10] the court faced a similar disagreement regarding the valuation of donated artwork. The taxpayer claimed the artwork was worth a substantial amount; the IRS claimed a lower value. The court had to choose between competing appraisals using different approaches. The Tax Court examined comparable sales of similar artwork and expert testimony regarding the artist’s reputation and market demand[11]] Ultimately, the court determined a value that differed from both parties’ positions, suggesting that when valuation is subjective, courts must make judicial choices that may not align with either expert’s analysis.

These cases reveal the lack of a uniform standard applied to these disputes. Instead, courts use a more flexible and individualized approach that leads to unpredictable and inconsistent outcomes. When taxpayers and the IRS present competing appraisals, courts do not apply a uniform test or standard. Instead, courts examine the reliability of each appraiser’s methodology, weigh the credibility of experts, and make fact-based determinations about which valuation is more reasonable. This approach is flexible but unpredictable. A taxpayer cannot know in advance whether a court will prioritize comparable sales, income approach, cost approach, or other methodologies. The outcome depends on the specific judge, the quality of expert testimony, and the particular facts of the case.

The statute’s appraisal requirement does not solve the fundamental problem of valuation uncertainty; it merely formalizes disagreement. Two qualified appraisers can both be competent, credible, and reasonable while reaching valuations that differ by millions of dollars. When this occurs, the courts must choose, and no statutory standard guides that choice.

IV. Critical Evaluation

The case law reveals a fundamental problem: the statute’s vague definition of “fair market value” combined with inconsistent judicial methodology creates unpredictable outcomes. When courts face competing appraisals, they lack clear standards for choosing between them. In Carter v. Commissioner, the court chose comparable sales methodology; in Ames v. Commissioner, the court examined comparable artwork and expert reputation. The statute provides no guidance on which approach is correct.

This inconsistency produces two consequences. First, litigation becomes necessary to resolve disputes that the appraisal requirement was supposed to prevent. Second, outcomes are unpredictable, making it difficult for taxpayers and charities to plan gifts with clear understanding of the tax outcome.

The current system fails to serve its policy goals. IRC § 170[12] is intended to encourage charitable giving by providing tax benefits. Yet valuation uncertainty discourages donors from committing to large gifts when the deduction’s value is uncertain. Reform is necessary for the sake of clarity in charitable giving and to reduce costly and time-consuming litigation.

V. Proposals for Reform

Two primary approaches could address the valuation uncertainty created by the current statute: statutory clarification or stricter appraisal requirements. A combination of both would be optimal.

Option 1: Statutory Clarification

Congress could amend IRC § 170 to provide clear guidance on valuation methodology for different categories of property. For artwork, the statute could specify that fair market value should be determined by reference to comparable sales of similar works by the same artist or similar artists. For real property, the statute could require comparable property analysis. For conservation easements, the statute could establish a specific methodology that accounts for the property’s highest and best use absent the easement.

Option 2: Stricter Appraisal Requirements

Congress could strengthen the appraisal requirement under IRC § 170(f)(11) in several ways. First, lower the threshold for required appraisals from $5,000 to $1,000. Second, require that appraisers be independently certified by a national organization, not merely self-described as “qualified.” Third, establish a presumption that a qualified appraisal is correct unless the IRS can present clear and convincing evidence of overvaluation. Fourth, limit the IRS’s ability to hire its own appraiser after the fact; instead, require appraisal disputes to be resolved through independent appraisal review.

The optimal approach combines both options. Congress should amend IRC § 170 to (1) specify valuation methodologies for major categories of property; (2) strengthen appraisal requirements and establish presumptions favoring qualified appraisals; and (3) create an independent appraisal review mechanism for disputes. This hybrid approach would reduce both abuse and uncertainty while protecting legitimate charitable giving.

VI. Conclusion

This article has demonstrated that federal tax law’s approach to charitable contribution valuations is inadequate. The statute’s vague definition of “fair market value,” combined with appraisal requirements that do not prevent disputes, has created a system marked by uncertainty and inconsistency. As the case law shows, courts reach different conclusions about valuation using different methodologies, leaving both taxpayers and the IRS unable to predict outcomes.

The statute should either clarify the valuation standard through explicit methodological guidance or impose stricter appraisal requirements to reduce disputes and create presumptions favoring qualified appraisals. A hybrid approach combining both elements would best serve the statute’s policy goal: encouraging charitable giving while preventing abuse.

Charitable giving serves an important social function. Tax law should facilitate and encourage it, not create barriers through valuation uncertainty. The current system does not serve taxpayers, charities, or the IRS well. Reform is necessary to align tax law with its stated policy goals and to ensure that legitimate charitable deductions are neither arbitrarily denied nor inappropriately inflated. 

REFERENCE(S):

Statutes

Internal Revenue Code § 170 (2024).

Internal Revenue Code § 170(a)(1) (2024).

Internal Revenue Code § 170(f)(11) (2024).

Treasury Regulations

Treas. Reg. § 1.170A-1 (2023).

Treas. Reg. § 1.170A-13 (2023).

Cases

Ames v. Comm’r, 102 T.C. 63 (1994).

Carter v. Comm’r, T.C. Memo 2023-133 (T.C. Nov. 6, 2023).

[1] I.R.C. § 170 (2024).

[2] I.R.C. § 170(a)(1) (2024).

[3] Id.

[4] Treas. Reg. § 1.170A-1(c) (2023).

[5] I.R.C. § 170(f)(11) (2024).

[6] Treas. Reg. § 1.170A-13 (2023).

[7] Treas. Reg. § 1.170A-1(c) (2023).

[8] Carter v. Comm’r, T.C. Memo 2023-133 (T.C. Nov. 6, 2023).

[9] Id. at 5.

[10] Ames v. Comm’r, 102 T.C. 63 (1994).

[11] Id. at 75.

[12] I.R.C. § 170 (2024).