University Endowment Excise Tax — Section 4968 Investment Income Tax on Private Colleges

Harvard has over $50 billion in endowment assets. Yale has $41 billion. Stanford has $37 billion. Princeton has $34 billion. For decades, these endowments — and those of hundreds of smaller private universities — generated billions of dollars in investment returns completely tax-free, because universities are 501(c)(3) organizations exempt from income tax. The Tax Cuts and Jobs Act of 2017 changed that by creating Section 4968, a new excise tax on the net investment income of private colleges and universities with large endowments. Originally enacted at a flat 1.4% for qualifying institutions, the tax was expanded in 2025 to a tiered structure based on per-student endowment wealth: 1.4% for institutions with endowments between $500,000 and $750,000 per student, 4% for those between $750,000 and $2 million per student, and 8% for those above $2 million per student. The tax applies only to private (not public) universities and only to those with at least 3,000 tuition-paying students, more than half in the U.S., and a per-student endowment above $500,000. The result: roughly two dozen of America's wealthiest private universities now pay a graduated excise tax on their investment earnings — a provision that Harvard, MIT, Princeton, and Yale all lobbied intensively against.

Current Law (2026)

Legal Authority

• 26 U.S.C. § 4968(a) — Tax imposed: an excise tax at the "applicable percentage" is imposed on the net investment income of each "applicable educational institution" for each taxable year
• 26 U.S.C. § 4968(b) — Applicable percentage (tiered rate structure): 1.4% if student adjusted endowment is $500,000–$750,000; 4% if $750,000–$2,000,000; 8% if over $2,000,000 — creating progressive taxation based on per-student endowment wealth
• 26 U.S.C. § 4968(c) — Applicable educational institution: an eligible educational institution (as defined in § 25A) with at least 3,000 tuition-paying students, more than 50% in the U.S., a student adjusted endowment of at least $500,000, and which is not a state college or university
• 26 U.S.C. § 4968(d) — Student adjusted endowment: the aggregate fair market value of the institution's assets (as of the end of the prior year), other than assets used directly in the exempt purpose, divided by the number of full-time equivalent students
• 26 U.S.C. § 4968(f) — Special rules: net investment income is calculated using private foundation rules under § 4940(c); student loan interest from loans made by the institution counts as investment income; "federally subsidized royalty income" (royalties from patents created using federal research funds) counts as investment income
• 26 U.S.C. § 4968(g) — Related organization aggregation: assets and net investment income of organizations controlled by the institution, or that are supporting organizations (§ 509(a)(3)) with respect to the institution, are treated as assets and income of the institution itself

Which Universities Are Affected?

The § 4968 tax affects only a small number of very wealthy private universities. As of 2026, the roughly two dozen institutions with student-adjusted endowments above $500,000 per student include Harvard, MIT, Yale, Princeton, Stanford, Dartmouth, Pomona College, Amherst College, Williams College, Swarthmore, and a handful of others.

At the 8% tier (>$2M per student): The wealthiest institutions — Harvard ($50B+ endowment, ~20,000 students), Princeton ($34B+ endowment, 8,000 students), MIT ($18B endowment, ~11,000 students) — generate hundreds of millions in investment income annually, of which 8% would be paid in excise taxes. Harvard's endowment generates approximately $3–4 billion annually in investment returns. At the 8% rate, Harvard would owe approximately $250–300 million per year.

The federally subsidized royalty rule: Perhaps the most aggressive provision of § 4968(f)(2) is the inclusion of royalty income from patents developed using federal research funding. Universities receive billions in federal research grants from NIH, NSF, DOD, and DOE. When those research programs generate commercially licensed patents, the royalties — which would normally be passive income excluded from UBIT because they're royalties from passive licenses — become investment income subject to the § 4968 excise tax. This provision directly targets the Bayh-Dole Act technology transfer industry built by research universities.

How the Student Adjusted Endowment Works

The "student adjusted endowment" calculation determines which tier applies. The formula:

Total assets (end of prior year) − assets used directly in exempt purpose ÷ FTE students

"Assets used directly in exempt purpose" means assets directly deployed in educational activities — classrooms, labs, dorms. Investment portfolio assets (the endowment itself), real estate holdings, and similar assets are included in the numerator.

Harvard's $50B+ endowment divided by ~20,000 FTE students = ~$2.5M per student → 8% tier.

A smaller liberal arts college with $2B in assets and 2,000 students has $1M per student → 4% tier, but may not qualify at all if it has fewer than 3,000 students.

The related organization rule prevents easy avoidance. If a university creates a separately incorporated investment fund, the assets and income of that fund are attributed back to the university if the fund is controlled by the university or is a § 509(a)(3) supporting organization.

How It Affects You

If you're a student at or applying to an affected university: The endowment tax is controversial because it potentially reduces money available for financial aid, research, and campus operations. Universities facing the 4% or 8% tier may respond by spending down endowment (increasing payout rates above the typical 5%), changing investment strategy, or shifting cost structures. Depending on your family's income, the education tax credits and 529 education expenses rules matter more to your actual out-of-pocket cost than the institution's endowment-tax burden. The practical impact on financial aid and tuition is heavily contested — universities argue the tax directly reduces aid; tax reformers argue the endowments are large enough to absorb the tax and increase aid simultaneously.

If you're a university administrator or trustee: § 4968 requires careful calculation of student-adjusted endowment values each year. Universities near the threshold between tiers have incentives to manage endowment levels and student counts to remain in a lower tier. The related organization aggregation rules require reviewing all controlled entities and supporting organizations to determine what assets and income must be included in the calculation — this is where compliance complexity concentrates. The student loan interest inclusion requires tracking institutional loan portfolios separately. Work with tax counsel to model your institution's tier status each spring before the fiscal year closes.

If you're a major donor to a private university: Gifts to endowments at affected institutions are still fully deductible as charitable contributions. However, the gift increases the endowment assets subject to the § 4968 excise tax, slightly reducing the economic value of the gift to the university relative to gifts that fund current operations (which don't affect endowment tax calculations). If endowment tax exposure is a meaningful concern, ask the development office how your gift will be deployed — a gift restricted to current scholarship spending has different tax implications than an unrestricted endowment contribution.

If you study or follow higher education policy: The § 4968 tax is explicitly redistributive: it taxes investment income of the wealthiest private universities and routes the revenue to the federal government (not to lower-income institutions). Proponents argue that endowments at institutions like Harvard — where per-student endowment vastly exceeds per-student spending on education — represent hoarding of tax-exempt wealth. Critics argue the tax discourages endowment growth and doesn't reach comparable wealth at public universities (the University of Michigan system, UT Austin's Permanent University Fund). The 2025 TCJA extension legislation included proposals to expand § 4968 coverage and raise the tax rate — this is an active legislative fault line.

State Variations

The § 4968 excise tax is federal only. States generally do not impose separate state taxes on university investment income, and most states provide exemptions from state income and property taxes for educational institutions. However, some states (Massachusetts most notably) have imposed their own "endowment tax" proposals, and several municipalities (including Cambridge, MA and New Haven, CT) have sought "payments in lieu of taxes" from Harvard and Yale, citing the tax-exempt status of properties owned by these wealthy institutions — which remain 501(c)(3) public charities for all other federal purposes, unlike the separate private foundation regime.

Pending Legislation

The 2025 expansion of § 4968 from a flat 1.4% to the current tiered rates was the most recent major change. Further proposals have included: raising the top rate above 8%, expanding the student count threshold downward to capture more mid-tier wealthy institutions, eliminating the 3,000-student minimum to reach wealthy small colleges, and closing the related organization aggregation rules. Legislation to repeal § 4968 entirely has been introduced by advocates for higher education but has not advanced.

Recent Developments

The original TCJA § 4968 tax at 1.4% generated approximately $250–300 million annually from roughly 35 institutions. The 2025 expansion to tiered rates significantly increased the tax burden on the wealthiest institutions. Harvard filed legal challenges to the original § 4968 tax but those challenges did not succeed. Treasury finalized regulations under § 4968 in 2021 clarifying the related organization aggregation rules and the treatment of assets "used directly in carrying out exempt purposes" — guidance that allowed some assets to be excluded from the denominator in ways that benefited affected institutions.

• Trump targeting Harvard and elite universities (2025): The Trump administration deployed multiple financial pressure tools against universities it characterized as hostile to free speech, supportive of pro-Palestinian protest, or maintaining DEI programs. Harvard — with a $53 billion endowment — was subjected to a grant freeze (freezing ~$2.2 billion in federal grants and contracts), threatened revocation of tax-exempt status, scrutiny of foreign student enrollment (international students can be denied F-1 visas), and investigation of antisemitism under Title VI. Columbia, Penn, Cornell, and other elite universities negotiated agreements with the administration; Harvard filed a federal lawsuit challenging the grant freeze.
• OBBBA endowment tax expansion (2025-2026): The "One Big Beautiful Bill Act" reconciliation package included a significant expansion of the § 4968 endowment excise tax: (1) tiered rates rising to 21% for institutions with over $750,000 endowment per student; (2) expanded applicability to institutions with over 3,000 students (from 500); and (3) inclusion of certain debt-financed income in the tax base. The expanded tax would apply to approximately 100+ institutions rather than the original ~35. Universities argue the tax discourages endowment growth that funds financial aid; supporters argue elite universities accumulate wealth rather than reduce tuition.
• Tax-exempt status threats: Trump allies suggested using the IRS to revoke tax-exempt status from universities that maintained DEI programs or engaged in speech the administration characterized as discriminatory. The IRS revocation of a university's 501(c)(3) status is extremely rare and legally difficult — requiring formal procedures and findings. However, the threat of IRS scrutiny has led some universities to accelerate dismantling of DEI programs. Legal scholars have noted that using IRS revocation for viewpoint-based enforcement could violate the First Amendment.
• Foreign funding disclosure at universities: The Trump administration directed the Department of Education to aggressively enforce Section 117 of the Higher Education Act, which requires universities to disclose foreign gifts and contracts above $250,000. Harvard, MIT, and other universities had been criticized for insufficient disclosure of gifts from Chinese, Saudi, and other foreign entities. The Trump DOE expanded investigations into foreign funding disclosures; universities with incomplete records face potential penalties and loss of federal funding.