Business Enterprise Definition (IRC 4943(d)(3))
The threshold question in any IRC 4943 analysis is whether the entity in which the foundation holds an interest qualifies as a "business enterprise." Under IRC 4943(d)(4), a business enterprise means any incorporated or unincorporated entity that carries on a trade or business, including operating businesses, general and limited partnerships, and limited liability companies treated as partnerships for federal tax purposes. The term also encompasses arrangements that, in substance, function as an active business even if structured to appear passive.
Three categories are expressly excluded from the business enterprise definition:
- Passive investment assets. A program of holding stocks, bonds, publicly traded securities, notes, debentures, or similar instruments for the production of income -- without an active trade or business -- is not a business enterprise. The critical distinction is whether the foundation participates in management decisions at the enterprise level, not merely investment selection at the portfolio level.
- Functionally related businesses. Under IRC 4943(d)(4)(A), a business whose activities are substantially related to the exercise of the foundation's charitable purpose (other than through the production of income) is excluded from the computation. See "Functionally Related Businesses" below.
- Program-related investments. Under IRC 4943(d)(4)(B), program-related investments (PRIs) as defined under IRC 4944(c) are excluded. A PRI is an investment whose primary purpose is to accomplish one or more charitable purposes and no significant purpose of which is the production of income or the appreciation of property.
Real property used directly in the foundation's exempt activities (a building occupied by the foundation's offices, for example) is also excluded because it does not constitute a "business enterprise" in the active-trade-or-business sense. By contrast, real estate held for investment income is analyzed under the general business enterprise rules.
Permitted Holdings (IRC 4943(c))
Once an interest falls within the business enterprise definition, the permitted holdings ceiling determines whether and to what extent the foundation's ownership constitutes excess business holdings.
The 20% General Rule
Under IRC 4943(c)(2)(A), the combined holdings of the private foundation and all disqualified persons in any business enterprise may not exceed 20% of the voting stock (or, for a partnership or LLC, 20% of the profits interest). For this purpose, "voting stock" means stock that, at the time of the relevant measurement, carries voting power in electing the board of directors or equivalent governing body. The foundation's own holdings are compared against the 20% ceiling after netting out any voting stock held by disqualified persons.
Example: A foundation holds 15% of the voting stock of a closely held corporation. The foundation's founder (a disqualified person) holds an additional 10%. Combined holdings equal 25%, which exceeds the 20% ceiling. The excess is 5% of the voting stock -- the value attributable to that 5% is subject to the IRC 4943(a) initial tax.
The 2% De Minimis Exception
If all disqualified persons together hold more than 20% of the voting stock of a business enterprise, the foundation may nonetheless hold up to 2% without those holdings constituting excess business holdings. IRC 4943(c)(2)(B). This de minimis exception is available only when disqualified persons already dominate the enterprise; it is not a general carve-out from the 20% ceiling.
The Effective Control Exception (IRC 4943(c)(3))
No excess business holdings exist if persons who are neither the foundation nor disqualified persons own more than 75% of the voting stock of the enterprise -- provided the foundation does not effectively control the enterprise through board representation, veto rights, or contractual arrangements. IRC 4943(c)(3). This exception turns entirely on the absence of effective control. A foundation that nominally holds a small percentage but retains the right to block major transactions or appoint board members may be treated as exercising effective control and lose the benefit of the exception.
Constructive Ownership
IRC 4943 incorporates attribution rules that aggregate holdings of family members and controlled entities when measuring the combined foundation-plus-disqualified-persons position. Disqualified persons for IRC 4943 purposes include substantial contributors to the foundation, foundation managers (officers, directors, trustees), and the family members (spouse, ancestors, lineal descendants, and the spouses of lineal descendants) of those individuals. A corporation, partnership, trust, or estate is itself a disqualified person if a disqualified person owns more than 35% of its voting power, profits interest, or beneficial interest. Holdings through any of these entities are attributed back to the individual and vice versa when computing the threshold.
The 5-Year Disposition Window (IRC 4943(c)(6))
When a private foundation acquires holdings in a business enterprise by gift or bequest that would otherwise constitute excess business holdings on the date of acquisition, IRC 4943(c)(6) provides a 5-year grace period during which those holdings are not treated as excess. This disposition window gives the foundation time to reduce its interest to the permitted level through sale, donation, or other transfer before the annual 10% excise tax begins to apply.
If the foundation has made good-faith efforts to dispose of the holdings but has been unable to do so because of their size, nature, or legal restrictions, the IRS may grant one additional 5-year extension under IRC 4943(c)(7). The request is made by letter ruling; the IRS is not required to grant the extension, and a favorable private letter ruling is not precedent for other taxpayers. Foundations seeking an extension should initiate the ruling request well before the original 5-year period expires.
Disposition Strategies
Common approaches to bringing holdings within permitted levels before the disposition window closes include:
- Outright sale to an unrelated third party at fair market value. This is generally the cleanest disposition but may generate capital gain that the foundation will report under IRC 4940. Post-OBBBA, the interaction between the recognized gain and the revised NII excise rate should be modeled before committing to a sale timeline.
- Donation to a public charity or other qualifying organization that is not a disqualified person. A donation to an organization in which a disqualified person retains an economic interest does not reduce the excess. See Compliance Trap below.
- Restrictions on voting rights. Converting voting stock to nonvoting stock can reduce the foundation's voting stock percentage, potentially bringing it below the threshold, but the analysis must account for whether the converted shares remain within the business enterprise definition and whether the conversion itself constitutes a self-dealing transaction under IRC 4941.
- Purchase by disqualified persons. A disqualified person may purchase the foundation's excess shares, but only at fair market value and structured so as not to constitute self-dealing. Because the purchase increases the disqualified persons' holdings, care is required to ensure the combined position does not create a different category of excess holdings problem.
Excess Business Holdings Excise Tax
Initial Tax (IRC 4943(a)(1)): 10% Per Year
The initial excise tax equals 10% of the value of the excess business holdings held by the foundation at any time during the taxable year, measured as of the last day of the taxable year. The tax is imposed for each taxable year (or portion thereof) that excess holdings exist. Because the measurement date is the last day of the taxable year, a foundation that acquires an excess position mid-year and disposes of it before year-end avoids the tax for that year -- but only if the disposal is complete before December 31 (for calendar-year foundations).
Additional Tax (IRC 4943(b)): 200%
If the excess business holdings are not disposed of (or otherwise reduced to the permitted level) within the correction period, IRC 4943(b) imposes an additional tax equal to 200% of the value of the remaining excess holdings. The correction period generally ends 90 days after the date on which the Tax Court decision with respect to the initial tax becomes final. The 200% rate is not a penalty in the conventional sense; it is designed to make non-correction economically irrational. At 200% of value, the additional tax typically exceeds the fair market value of the excess holdings by a substantial margin, making prompt disposition the only rational response once the initial tax is assessed.
Computation of the Tax
The taxable amount for each year is the fair market value of the foundation's holdings that exceed the permitted percentage, valued as of the last day of the taxable year. For publicly traded securities, year-end closing price provides an objective baseline. For closely held businesses and limited partnership interests, the foundation must obtain a qualified appraisal sufficient to withstand IRS scrutiny. The 10% is applied to that value; the resulting amount is reported on Schedule C of Form 4720.
OBBBA 2026 Planning Considerations
The One Big Beautiful Budget Act (OBBBA) revised the IRC 4940 excise tax structure, altering the cost-benefit calculus for foundations evaluating whether to retain business holdings during the 5-year disposition window. Under prior law, the flat 1.39% NII excise rate applied to income generated by all foundation assets. Post-OBBBA, the interaction between the revised IRC 4940 rate structure and the IRC 4943 annual 10% penalty on excess holdings value creates a new modeling requirement for foundations with pending disposition windows.
In some structures, the combined annual carrying cost -- IRC 4943 initial tax plus OBBBA-adjusted IRC 4940 NII excise on income generated by the excess holding -- exceeds the capital gains cost of an accelerated disposition before the window closes. In others, where the business interest generates modest income relative to its value, the economics favor holding through the window and disposing in a tax year with offsetting deductions or losses. Neither generalization holds across all fact patterns; each foundation's situation must be modeled independently.
Form 4720 Mechanics
Form 4720, Return of Certain Excise Taxes Under Chapters 41 and 42, is the reporting vehicle for the IRC 4943 excess business holdings tax. The private foundation (not its officers or managers) is the taxpayer for IRC 4943 purposes; the foundation completes and files Form 4720, not the individual disqualified persons.
Who Must File
A private foundation must file Form 4720 for any taxable year in which it had excess business holdings at any time. This includes foundations in the middle of the 5-year disposition window (which are exempt from the excise but may nonetheless have disclosure obligations) -- however, the tax itself is triggered only if excess holdings remain after the window expires. Foundations that discover an unintended excess mid-year should consult qualified tax counsel about whether and when to file an amended return or voluntary disclosure.
Due Dates and Extensions
Form 4720 is due on the 15th day of the 5th month after the close of the foundation's taxable year -- May 15 for calendar-year foundations. An automatic 6-month extension is available using Form 8868. Estimated tax payments of the IRC 4943 initial tax are required under IRC 6655 rules adapted for private foundations; underpayment of estimated excise tax triggers penalties even if the annual return is filed on time.
Relationship to Form 990-PF
Form 990-PF is the foundation's annual information return; it does not replace Form 4720. Excess business holdings are disclosed on Form 990-PF (Part II, balance sheet, and the narrative disclosures), but the tax computation and payment are made on Form 4720. Practitioners should confirm that the values reported for excess holdings on Form 990-PF are consistent with the values used to compute the excise on Form 4720, Schedule C, to avoid a discrepancy that triggers examination.
Functionally Related Businesses
A business enterprise qualifies as "functionally related" -- and is thus excluded from the IRC 4943 excess holdings computation -- if its activities are substantially related to the exercise of the foundation's exempt purpose, beyond merely providing income to fund the foundation's charitable grants. IRC 4943(d)(4)(A). The standard is similar to, but distinct from, the "substantially related" test under the unrelated business income rules of IRC 512.
Examples of functionally related businesses recognized in IRS guidance and case law include: a museum foundation's retail shop selling reproductions of works in its collection; an educational foundation's university press publishing academic texts consistent with its educational mission; a health-focused foundation's pharmacy serving patients in an underserved area consistent with the foundation's health access mission. In each case, the business activity must be directly related to the charitable program, not merely ancillary to it.
Audit risk is elevated for functionally related business claims. The IRS scrutinizes whether the commercial activity is genuinely advancing the charitable purpose or is simply a revenue-generating operation that happens to be operated alongside a charitable program. Foundations relying on the functionally related business exclusion should document the operational connection in contemporaneous board minutes and annual reports and obtain a legal opinion if the connection is not apparent on the face of the activity.
Program-Related Investments
Program-related investments (PRIs) are excluded from the business enterprise definition under IRC 4943(d)(4)(B) and therefore do not count toward the permitted holdings calculation. A PRI is defined under IRC 4944(c) as an investment (1) the primary purpose of which is to accomplish one or more exempt purposes described in IRC 170(c)(2)(B), and (2) no significant purpose of which is the production of income or appreciation of property. PRIs include low-interest loans to small businesses in economically distressed communities, equity investments in minority-owned enterprises serving charitable goals, and debt instruments extended to nonprofits for capacity-building projects.
The PRI exclusion is self-executing: no IRS advance approval is required to treat an investment as a PRI for IRC 4943 purposes. However, the IRS may challenge PRI treatment on examination if the foundation cannot demonstrate that the primary purpose is charitable rather than financial. Practitioners should apply the same substantiation standards used for the IRC 4942 qualifying distribution treatment of PRIs. Cross-reference: IRC 4942 minimum distribution requirements discusses the interaction between PRIs and the qualifying distribution rules.
IRC 4943 Holding Type Reference Table
The table below summarizes how common holding types are treated for purposes of the IRC 4943 excess business holdings computation. "Included" means the interest counts toward the 20% permitted holdings ceiling; "Excluded" means it falls outside the business enterprise definition or a statutory exclusion applies.
| Holding Type | Included in IRC 4943 Computation? | Notes |
|---|---|---|
| Voting stock in a closely held corporation | Yes | Primary subject of the IRC 4943(c) permitted holdings ceiling. Foundation holdings plus disqualified person holdings may not exceed 20% of voting stock. |
| Nonvoting stock in a closely held corporation | Yes | Nonvoting stock is included unless disqualified persons hold all voting stock. IRC 4943(c)(2) applies to the corporation's total outstanding equity, not only voting shares, when disqualified persons hold 100% of voting stock. |
| Partnership profits interest | Yes | A partnership carrying on a trade or business is a business enterprise. The foundation's profits interest percentage is measured against the 20% ceiling. Capital interest is also examined where profits interest is indeterminate. |
| LLC membership interest | Yes | An LLC treated as a partnership for federal tax purposes and engaged in an active trade or business is a business enterprise. The foundation's percentage membership interest is the relevant metric. |
| Sole proprietorship | Yes | A foundation operating a business as a sole proprietorship holds 100% of that enterprise. Unless a statutory exclusion applies, the full operating business constitutes excess business holdings to the extent it exceeds the permitted level (generally zero for a sole proprietorship, since 100% exceeds 20%). |
| Publicly traded securities (below threshold) | Excluded | Holdings of publicly traded securities at a percentage below the level that would trigger "effective control" or require SEC Schedule 13D/13G filing are treated as passive investment assets, not a business enterprise, under Reg. 53.4943-10(c). |
| Publicly traded securities (above 20%) | Yes | A large-block holding in a publicly traded company that exceeds 20% combined (foundation plus disqualified persons) falls within the business enterprise rules. The passive investment exclusion does not shield large-block positions that approach or exceed the effective control threshold. |
| Functionally related business | Excluded | Excluded from the business enterprise definition under IRC 4943(d)(4)(A) if activities are substantially related to the foundation's exempt purpose. IRS scrutiny is elevated; contemporaneous documentation required. |
| Program-related investment (PRI) | Excluded | Excluded under IRC 4943(d)(4)(B) if the investment's primary purpose is charitable and no significant purpose is income production or appreciation. Self-executing; no advance IRS approval required, but documentation is critical. |
| Real property used in exempt function | Excluded | Real property occupied and used directly in the foundation's charitable programs (e.g., a foundation-owned community center) is not a business enterprise. Real property held for rental income is analyzed under the general business enterprise rules. |
| Co-investment alongside a donor-advised fund (DAF) | Fact-specific | A DAF sponsoring organization is not automatically a disqualified person, but if the foundation's donor also controls the DAF and is a disqualified person with respect to the foundation, the DAF's holdings may be attributed. Each co-investment structure must be analyzed under the constructive ownership rules. Obtain counsel before treating DAF co-investment shares as outside the computation. |
Compliance Traps
Frequently Asked Questions
What are excess business holdings under IRC 4943?
Excess business holdings under IRC 4943 are the combined ownership interests -- in voting stock, nonvoting stock, profits interests, or equivalent equity -- that a private foundation and all disqualified persons together hold in a business enterprise beyond the permitted threshold. The general permitted threshold is 20% of the voting stock or profits interest in any single enterprise. Holdings above that ceiling are subject to the IRC 4943 excise tax until they are disposed of or otherwise brought below the threshold.
What is the permitted holdings percentage under IRC 4943?
Under IRC 4943(c)(2), a private foundation's permitted holdings in any business enterprise are the greater of: (1) 20% of the voting stock (or profits interest in a partnership or LLC) reduced by the percentage held by all disqualified persons; or (2) 2% of the voting stock if all disqualified persons together own more than 20%. A separate effective-control exception under IRC 4943(c)(3) provides that no excess holdings exist if persons who are neither the foundation nor disqualified persons own more than 75% of the voting stock, provided the foundation does not effectively control the enterprise.
What is the 5-year disposition window under IRC 4943?
IRC 4943(c)(6) provides that holdings received by gift or bequest that would otherwise constitute excess business holdings are not treated as excess holdings for the first 5 years after acquisition, giving the foundation time to dispose of the interest down to the permitted level. The 5-year period begins on the date the foundation first acquires the holdings -- not the date the foundation discovers the problem. The IRS has authority under IRC 4943(c)(7) to grant one additional 5-year extension where the foundation has made good-faith efforts to dispose but has been unable to do so due to the size or type of the holding.
What is the tax rate for excess business holdings under IRC 4943?
IRC 4943(a)(1) imposes an initial excise tax of 10% per year on the value of excess business holdings as of the last day of the taxable year. If the excess holdings are not disposed of or otherwise eliminated during the correction period (generally 90 days after the Tax Court decision on the initial tax becomes final), IRC 4943(b) imposes an additional tax of 200% of the value of the remaining excess holdings. The 200% rate makes failure to correct one of the most economically severe sanctions in the private foundation excise tax regime.
What is a functionally related business under IRC 4943?
A functionally related business is a business enterprise whose activities are substantially related (aside from providing funds) to the exercise of the foundation's exempt purpose. Under IRC 4943(d)(4), interests in a functionally related business are excluded from the excess business holdings computation entirely. The connection must be direct and substantial, not merely that the business generates income that is donated to the foundation's programs. Examples include a museum's gift shop, a university press, or a hospital's pharmacy. The IRS scrutinizes functionally related business claims during examination.
How do constructive ownership rules apply under IRC 4943?
IRC 4943 applies constructive ownership rules that attribute holdings among family members and controlled entities. Under IRC 4943(d)(1), disqualified persons include the foundation's substantial contributors, foundation managers, and family members (spouse, ancestors, descendants, and their spouses) of the foregoing. Holdings of one family member are attributed to other family members for purposes of determining whether the combined foundation-plus-disqualified-persons threshold is exceeded. A corporation or partnership is itself a disqualified person if a disqualified person owns more than 35% of its voting power, profits interest, or beneficial interest.
What is Form 4720 and when must it be filed?
Form 4720, Return of Certain Excise Taxes Under Chapters 41 and 42, is the reporting and payment vehicle for private foundation excise taxes including the IRC 4943 excess business holdings tax. A private foundation that has excess business holdings at any point during the taxable year must complete Schedule C of Form 4720 and report the value of the excess holdings and the 10% initial tax owed. Form 4720 is due on the same date as Form 990-PF (the 15th day of the 5th month after the close of the taxable year, with a 6-month extension available). The foundation, not its officers, is the taxpayer on Form 4720 for IRC 4943 purposes.
How does OBBBA affect IRC 4943 planning?
The One Big Beautiful Budget Act (OBBBA) revised the IRC 4940 net investment income excise tax structure, altering the cost-benefit analysis for foundations deciding whether to retain business holdings during the 5-year disposition window. Because the IRC 4943 annual 10% excise applies to the fair market value of excess holdings while the revised IRC 4940 rate applies to net investment income generated by those same holdings, the combined annual cost of holding an appreciated, income-producing interest through the window may exceed the capital gains tax cost of an accelerated sale. Practitioners should model both regimes for clients with pending disposition windows. Verify OBBBA effective rates and any transitional provisions at IRS.gov before advising.
IRC 4943 Analysis, Disposition Planning, and Form 4720 Preparation
Americas Tax advises private foundations and their counsel on excess business holdings compliance, 5-year disposition window strategy, constructive ownership mapping, and Form 4720 preparation. If your foundation holds a business interest that may exceed the permitted threshold -- or if the disposition window is approaching -- contact us for a structured analysis before the annual measurement date arrives.
Contact Americas Tax Private Foundation Tax Practice | americastax.com