The Framework

A comprehensive primary-source reference for the U.S. tax-exempt regulatory architecture — the statutes, regulations, enforcement mechanisms, and public records that govern every § 501(c)(3) charity in America.

U.S. charities — universities, hospitals, foundations, religious organizations, and OpenAI, Inc. — operate inside a regulatory framework defined by the Internal Revenue Code, the Treasury Regulations interpreting it, and decades of IRS guidance. This page is a primary-source reference: the statutes, the regulations, the enforcement mechanisms, and the public databases where any reader can verify what U.S. tax law actually requires of a § 501(c)(3) organization. Citations link directly to canonical free sources — Cornell Law School's Legal Information Institute, the federal eCFR, and IRS.gov — so any claim on this page can be checked against the underlying authority.

What § 501(c)(3) actually says

Section 501(c)(3) of the Internal Revenue Code is the federal exemption that gives U.S. charities — universities, hospitals, foundations, religious organizations, and OpenAI, Inc. — their tax-exempt status. The operative statutory language is short, and it contains the doctrinal hook that drives modern charitable-trust litigation:

The bolded clause is the inurement prohibition. It is the absolute rule of nonprofit law: no portion of the charity's earnings may "inure" — flow privately — to any insider. The Treasury Regulation that interprets the statute, 26 CFR § 1.501(c)(3)-1, breaks this into two tests an organization must satisfy continuously:

The organizational test looks at the entity's founding documents — its certificate of incorporation, bylaws, and stated purposes. Does the charter limit the organization to charitable purposes? Does it irrevocably dedicate assets to those purposes? Does it prohibit private inurement? OpenAI's certificate of incorporation, quoted in the federal complaint, was drafted to pass this test. It included the canonical inurement-prohibition language and the irrevocable-dedication clause.

The operational test asks whether the organization actually behaves consistent with its charter — not just at founding, but throughout its existence. An organization that satisfies the organizational test on day one can fail the operational test on day 3,650 if its conduct drifts. This is the test that nonprofit-conversion litigation ultimately implicates: whatever a charity's charter said at incorporation, courts and regulators apply the operational test to its actual conduct over time.

Inurement vs. private benefit

Tax practitioners distinguish between two related but distinct doctrines that both fall under § 501(c)(3):

Private inurement applies only to insiders — directors, officers, founders, key employees, and people with substantial influence over the organization. The rule is absolute: any inurement, no matter how small, is grounds for revocation of tax-exempt status. There is no de minimis exception. The statutory phrase "no part of the net earnings of which inures" means exactly that: none. This severity is why the doctrine has, in practice, been moderated by the intermediate-sanctions regime under § 4958 (discussed below), which gives the IRS a remedy short of revocation.

Private benefit is broader. It applies to anyone, insider or not, and asks whether the organization's activities confer benefit on private parties beyond what is incidental to its charitable purpose. Private benefit is judged on a balancing test, not absolute terms. An organization can confer some private benefit without losing exemption, but only if the private benefit is qualitatively and quantitatively incidental to the charitable purpose. The leading case on this distinction is American Campaign Academy v. Commissioner, 92 T.C. 1053 (1989), where the Tax Court held that an educational organization training Republican political operatives conferred more-than-incidental benefit on the Republican Party.

Both doctrines are relevant when a charity restructures or enters substantial commercial relationships. The inurement question asks whether insiders received private financial benefit — through equity, options, salary, or otherwise — that would violate the absolute prohibition. The private-benefit question asks whether commercial counterparties received benefit from the charity's mission, IP, or reputation that exceeded "incidental."

Enforcement architecture

Federal § 501(c)(3) law is enforced through a layered architecture involving the IRS, state attorneys general, and — in narrow circumstances — private parties. Understanding who enforces what is essential to reading any nonprofit-law dispute, including Musk v. Altman:

The IRS can revoke tax-exempt status entirely under § 501(c)(3) if an organization fails the organizational or operational test, or if any inurement is found. Short of revocation, the IRS can impose intermediate sanctions under 26 U.S.C. § 4958 — excise taxes on "excess benefit transactions" between a charity and a "disqualified person" (an insider). The IRS does not publicly comment on whether it is investigating any particular organization; § 6103 of the Internal Revenue Code generally prohibits disclosure of taxpayer information.

State attorneys general have parens patriae authority over charitable trusts within their states. The AG, as the public's representative, has standing to bring enforcement actions for breach of charitable trust independent of any donor. This is a long-standing common-law doctrine codified in most state nonprofit corporation statutes. State AG enforcement is, in practice, far more visible than IRS enforcement — settlements and consent decrees are public, and state AGs can pursue equitable remedies (dissolution, reformation, removal of officers) that are unavailable to the IRS.

Donors, traditionally, do not have standing to enforce charitable trusts. The historical rule, articulated in Smithers v. St. Luke's-Roosevelt Hospital Center, 281 A.D.2d 127 (N.Y. App. Div. 2001), is that donors generally lack standing because the AG represents the public's interest in the charity's mission. There are narrow exceptions — for example, when the gift instrument explicitly reserves enforcement rights, or when the donor's contribution was conditional in a way that creates a private right of action. The question of whether and when a major donor has standing to sue for breach of charitable trust is itself an open and developing legal question, which is one reason the Musk v. Altman case has been closely watched by nonprofit-law specialists.

§ 4958 intermediate sanctions in practice

Before 1996, the IRS had only one tool against charities that engaged in inurement: full revocation of tax-exempt status. This was widely understood as a nuclear option, often disproportionate to the conduct at issue. Revocation harms not only the wrongdoers but also the beneficiaries of the charity's continuing programs. Congress responded with the Taxpayer Bill of Rights 2 (1996), which added § 4958 to the Internal Revenue Code — creating "intermediate sanctions" that target the wrongdoer, not the organization.

The two-tier excise tax

Section 4958 imposes a two-tier excise tax structure on "excess benefit transactions":

First-tier tax (25%): Imposed on the disqualified person who received the excess benefit, equal to 25% of the excess benefit amount. If multiple disqualified persons are liable, they are jointly and severally liable. Second-tier tax (200%): Imposed if the excess benefit is not "corrected" within the taxable period, equal to 200% of the excess benefit. This is the punitive layer, designed to force correction. Manager tax (10%): Imposed on any organization manager who knowingly participated in the excess benefit transaction, capped at $20,000 per transaction.

"Correction" means undoing the excess benefit — typically by the disqualified person paying the organization the amount of the excess benefit plus interest at the applicable federal rate. The statutory framework is designed to be self-executing: the disqualified person, not the IRS, calculates and pays the tax on Form 4720.

Who is a "disqualified person"?

The reach of § 4958 depends entirely on who counts as a "disqualified person." The statute defines this as anyone who, at any time during the five-year "lookback period," was in a position to exercise substantial influence over the affairs of the organization. The Treasury Regulations, at 26 CFR § 53.4958-3, identify several per se categories: voting members of the governing body, presidents and CEOs, COOs, treasurers and CFOs (regardless of title — anyone with "ultimate responsibility for managing the finances of the organization"), and family members down to the level of great-grandchildren.

Beyond per se categories, the regulations apply a facts-and-circumstances test. Founders, substantial contributors, and persons with substantial control over a particular department or function can be disqualified persons even without holding a named officer title. This breadth is intentional: the statute was designed to reach the substance of insider influence, not just the form of corporate office.

The rebuttable presumption of reasonableness

One of the most significant procedural features of the § 4958 regime is the rebuttable presumption of reasonableness. If a charity follows three procedural steps when setting compensation for a disqualified person, the burden of proof shifts to the IRS to prove the compensation was unreasonable. First, the compensation arrangement must be approved in advance by an authorized body composed entirely of individuals who do not have a conflict of interest. Second, that body must obtain and rely upon "appropriate data as to comparability" before making its determination. Third, the body must adequately document the basis for its determination concurrently with the decision.

This is why nonprofit boards often retain executive-compensation consultants and document compensation decisions extensively in board minutes. The presumption is rebuttable — the IRS can still pursue the matter — but the procedural shield is meaningful in practice.

Real-world enforcement

Section 4958 is not theoretical. In a 2024 Tax Court case involving a medical missions charity, the IRS imposed substantial intermediate sanctions on the founder's wife, who served as a director and executive officer, for excess benefit transactions including unsubstantiated personal expenses paid by the charity. The IRS also retroactively revoked the charity's tax-exempt status. The case illustrates two practical points: family members of insiders are themselves disqualified persons, and intermediate sanctions and revocation are not mutually exclusive — the IRS can impose both, particularly where the inurement is pervasive enough to call into question whether the organization functioned as a charity at all.

The IRS's published guidance distinguishes between "automatic" excess benefit transactions — which arise without regard to the size of the benefit, primarily where compensation or reimbursements are not properly reported as taxable income — and benefits that require valuation analysis. Both categories are covered by § 4958, but the automatic category is operationally more dangerous: a single unreported personal expense reimbursement can trigger sanctions regardless of amount.

State attorney general charitable-trust authority

Federal § 501(c)(3) status governs an organization's federal tax treatment, but the substantive law of charitable trusts and nonprofit corporations is primarily state law. Every state has its own nonprofit corporation statute, its own attorney general's office with charitable-trust jurisdiction, and its own body of common law on fiduciary duties of nonprofit directors. For a charity operating across multiple states, multiple AGs have concurrent authority.

For technology-sector nonprofits, three jurisdictions matter most: California (where operations are typically located), Delaware (where most are incorporated), and New York (which has the most aggressive AG charities bureau and where many financial activities occur). The differences among these three are substantive:

Beyond these three, the National Association of State Charity Officials (NASCO) coordinates multistate charity enforcement. When a charity operates in multiple jurisdictions, AGs can — and do — coordinate investigations and bring joint actions.

Two practical points distinguish state AG enforcement from federal IRS enforcement. First, AG actions are public — complaints are filed in court and settlements are reported. Second, AG remedies extend beyond financial penalties: AGs can seek removal of directors, court-supervised reformation of trusts, dissolution, and equitable redirection of charitable assets to other organizations performing similar missions (the doctrine of cy pres).

The current enforcement record in OpenAI's case

The publicly available record of regulatory engagement with OpenAI's restructuring, as of trial, is as follows:

The California Attorney General, Rob Bonta, was named as a party in Musk's suit. The CA AG's office declined to join Musk's action, stating that the office did not see how the action serves the public interest. Separately, the California and Delaware AG offices were involved in negotiating modifications to OpenAI's October 2025 restructuring — most notably reversing OpenAI's initial plan to give the nonprofit only a minority stake in the new public benefit corporation, ultimately requiring the nonprofit to retain controlling interest.

The Delaware Attorney General, Kathy Jennings, ultimately approved OpenAI's October 2025 conversion of its for-profit arm to a Delaware Public Benefit Corporation, with the OpenAI Foundation (the renamed nonprofit) retaining controlling interest.

The IRS has not made any public statement about OpenAI's tax-exempt status. As a matter of standard policy, and under § 6103 of the Code, the IRS does not confirm or deny investigations of specific organizations.

The FTC and DOJ Antitrust Division filed a joint amicus brief in the case in January 2025, but their input was specifically directed at the Section 8 Clayton Act interlocking-directorate claims (involving Microsoft's seats on the OpenAI board), not at the underlying charitable-trust question.

Nonprofit-to-public-benefit-corporation conversions

One of the most significant recent developments in nonprofit law is the rise of the public benefit corporation (PBC) as a structural compromise between traditional nonprofit form and conventional for-profit corporate form. Several frontier AI laboratories have either adopted PBC structure from inception or converted into PBC structure from a prior nonprofit form. Understanding what a PBC is — and what it isn't — is essential to reading the regulatory landscape that frames Musk v. Altman.

What a PBC is

A public benefit corporation is a for-profit corporation that has, by charter, an obligation to balance shareholders' financial interests against a stated public benefit purpose. PBC statutes exist in over 35 U.S. states, but the Delaware General Corporation Law (8 Del. C. § 361 et seq.) is by far the most widely used. A Delaware PBC must identify in its charter one or more "specific public benefits" the corporation will promote, require directors to balance shareholders' pecuniary interests against the interests of those materially affected by the corporation's conduct and the public-benefit purposes, and report biennially on its public-benefit performance to shareholders.

Crucially, a PBC is not tax-exempt. It pays corporate income tax. Donations to a PBC are not deductible. The PBC form is best understood as a corporate-governance modification, not a tax status. The "benefit" of PBC form is largely defensive: directors who consider non-shareholder interests in their decisions have a statutory shield against shareholder lawsuits arguing they breached fiduciary duty by not maximizing share value.

How AI labs have used the structure

Several frontier AI organizations have adopted variants of the PBC or hybrid nonprofit/PBC structure:

The novel question: nonprofit parent over PBC subsidiary

The Mozilla-style structure (501(c)(3) parent, taxable subsidiary) has existed for decades and is uncontroversial. The OpenAI structure — 501(c)(3) parent, PBC subsidiary, with the PBC raising substantial outside investment — raises questions that have not been definitively resolved in the case law.

First, whether a 501(c)(3) parent's controlling interest in a PBC subsidiary that has issued equity to outside investors satisfies the operational test under 26 CFR § 1.501(c)(3)-1. The answer likely depends on facts: the percentage of nonprofit ownership, the governance rights retained, the flow of value, and whether the subsidiary's commercial activities further the parent's exempt purpose.

Second, whether the value transferred from a 501(c)(3) parent to a PBC subsidiary at the moment of restructuring — typically intellectual property, brand, and operational know-how — must be valued at fair market value, with the difference between fair market value and any consideration received treated as inurement (if it benefits insiders) or impermissible private benefit (if it benefits outside investors). This valuation question was central to the AG-negotiated modifications of OpenAI's restructuring.

Third, whether and how state AG approval of a conversion forecloses subsequent IRS or donor challenge. State AG sign-off does not bind the IRS — federal tax-exempt status is a federal question — but it is highly persuasive evidence that the operational test continues to be satisfied.

These questions are likely to be litigated more frequently as additional AI labs and other technology nonprofits face the practical pressure of capital-intensive operations against the structural constraints of the 501(c)(3) form. Musk v. Altman is the first major test, but unlikely to be the last.

Reading OpenAI's own filings

Every § 501(c)(3) public charity is required to file Form 990 annually with the IRS. Form 990 discloses revenue, expenses, executive compensation, related-party transactions, and a description of the organization's mission and activities. These filings are public records.

OpenAI, Inc. — EIN 81-0861541 — has filed Form 990s for every year since 2015. They are accessible through several public databases:

How the framework connects to the case

None of the doctrine and machinery described above is meant to predict an outcome in Musk v. Altman. The trial is being heard by a federal judge in Oakland, applying state-law charitable-trust doctrine alongside federal statutory claims. The IRS framework discussed on this page is the regulatory backdrop, not the cause of action.

What the framework does provide is a way to read the facts as they emerge at trial. When a witness testifies about what was discussed at an OpenAI board meeting in 2017 or 2019, a tax-aware reader can ask: would those discussions have satisfied the operational test under 26 CFR § 1.501(c)(3)-1? When an exhibit shows compensation paid to a key insider, a reader can ask: would that compensation be an "excess benefit transaction" under § 4958, and if so, did the board follow the procedural steps necessary to invoke the rebuttable presumption of reasonableness? When the October 2025 restructuring is described, a reader can ask: did the modifications negotiated with the California and Delaware AGs preserve the substance of the charitable trust, or only its form?

Those questions are not for this page to answer. They are questions any reader can take to the trial transcript, the Form 990 filings, and the regulatory texts linked throughout this page. The framework is the lens, not the verdict.

Primary statutory and regulatory sources

For readers who want to verify any claim on this page against the underlying law, the canonical free sources are Cornell Law School's Legal Information Institute (for the U.S. Code), the federal eCFR (for Treasury Regulations), and IRS.gov (for IRS guidance):