Private college endowment tax jumps to 21% for top schools

The One Big Beautiful Bill Act restructures how the federal government taxes investment income at the wealthiest private colleges and universities. Section 70415 replaces the flat 1.4% endowment excise tax established under the Tax Cuts and Jobs Act with a four-tier rate structure that scales with endowment size per tuition-paying student. The new top tier reaches 21%, matching the federal corporate income tax rate, and applies to institutions with endowments exceeding $2 million per student.

The provision affects roughly 50 to 60 private institutions in the United States that meet both the headcount and endowment-per-student thresholds. While the legal taxpayer is the institution itself, the practical reach extends to donors evaluating large gifts, alum planning estate transfers to alma maters, investment managers running university endowment portfolios, and tax advisors counseling clients with substantial higher-education giving programs. Endowment economics influence the availability of financial aid, faculty hiring, and capital project timing in ways that ripple back to donor and alums relationships.

This article walks through the new tiered rate structure with corrected statutory rates, explains which institutions cross each threshold, breaks down what the law expanded into the tax base, and analyzes the planning implications for donors and stakeholders connected to affected institutions.

What Section 70415 changed about the endowment excise

Before OBBBA, all private institutions meeting the threshold paid a single 1.4% rate on net investment income. The threshold required at least 500 tuition-paying students with a majority enrolled in the United States, and an endowment of at least $500,000 per student. About 33 to 36 institutions paid the tax annually under that flat structure.

OBBBA Section 70415 keeps the 500-student threshold but rebuilds the rate side into four tiers based on endowment-per-student value:

1. Endowment of $500,000 to $750,000 per student pays 1.4%
2. Endowment of $750,000 to $1.25 million per student pays 7%
3. Endowment of $1.25 million to $2 million per student pays 14%
4. Endowment exceeding $2 million per student pays 21%

The 7%, 14%, and 21% tiers represent dramatic increases over the prior flat rate. An institution moving from the bottom tier to the top tier sees its effective rate increase fifteenfold on the same level of investment income. The 21% top tier is not a coincidence. It deliberately equals the federal corporate income tax rate, which positions the largest institutional endowments to be taxed at parity with publicly traded C corporations rather than as historically exempt charitable entities.

The provision also expands the scope of taxable investment income. Two previously exempt categories now sit inside the tax base. Interest income on student loans held by the institution becomes taxable. Royalty income from federally funded patent activity also becomes taxable. These additions matter most for research-heavy universities with large patent portfolios funded through federal grants and substantial direct student lending operations.

Which colleges fall into each new endowment tax tier

The endowment per student is calculated by dividing the institution's total endowment by the number of tuition-paying U.S. students enrolled. Both inputs matter, so an institution can sit in different tiers depending on whether its endowment grows faster than its enrollment, or vice versa.

Approximate placement by tier, based on publicly reported endowment data and enrollment figures from the most recent reporting cycle:

• Bottom tier (1.4%) covers most affected institutions, including a wide group of well-known private universities with endowments between $500K and $750K per student
• Middle tier (7%) captures a smaller group with endowments between $750K and $1.25M per student
• Upper-middle tier (14%) covers the wealthiest research universities with endowments between $1.25M and $2M per student
• Top tier (21%) applies to a very small number of institutions, typically including the wealthiest of the Ivy League and a handful of other institutions whose endowments significantly exceed enrollment.

The provision excludes public universities entirely. It also excludes religious institutions founded before 1776 that continue to conduct religious missions. The pre-1776 carveout is narrow but meaningful for the small number of colonial-era religious colleges that meet the substantive criteria. Most other religious institutions remain subject to the tax if they meet the endowment and headcount thresholds.

For tax advisors counseling Individuals with major donor relationships, knowing where each institution sits on the tier ladder helps frame conversations about gift timing, gift structure, and the cascading effects of new gifts on the institution's per-student calculation.

How much does the new endowment excise cost institutions

The dollar impact at each tier is large enough to reshape institutional financial planning. Consider the same $50 million in net investment income across four illustrative institutions at different tier positions.

An institution in the bottom 1.4% tier owes $700,000 in federal excise tax on $50 million of investment income. Net retained income after tax is $49.3 million.

An institution in the 7% tier owes $3.5 million on the same $50 million of investment income. Net retained income is $46.5 million. The tier jump from 1.4% to 7% increases the tax burden by $2.8 million per year on the same income base.

An institution in the 14% tier owes $7 million on $50 million of investment income. Net retained income is $43 million. Compared to bottom-tier treatment, the institution loses $6.3 million per year in spendable income to federal taxes.

An institution in the 21% tier owes $10.5 million on $50 million of investment income. Net retained income is $39.5 million. Compared to the prior 1.4% flat rate, the same institution generating the same investment income now pays $9.8 million more in federal excise tax annually.

Multiply these annual differentials across multi-year endowment planning horizons, and the policy effect compounds. For an institution in the top tier, $10 million in additional annual tax over a decade amounts to $100 million in foregone scholarship, faculty, or capital spending capacity, before accounting for investment growth on retained dollars. This is the order of magnitude that shifts institutional behavior.

For donors managing their own portfolios alongside major giving programs, Tax loss harvesting in taxable accounts continues to operate independently of the institutional excise. Personal investment losses do not transfer to the institutional return.

What new income types are subject to the endowment tax

Adding student loan interest and federally funded patent royalties to the tax base changes the calculation for research-intensive universities. Many of the largest private research institutions hold substantial portfolios of student loans they originated directly, and earn royalty income from patents developed under federal grant funding. Both income streams previously sat outside the 1.4% excise calculation. Both are now in.

The inclusion of student loan interest has practical limits because most large universities have moved away from the direct origination of student loans over the past two decades, instead participating in federal loan programs administered by the Department of Education. Direct institutional lending remains common at some private medical and graduate schools, where it can represent a meaningful income line.

The patent royalty inclusion has a broader reach. Major research universities license technology developed in their labs to commercial partners, and royalty income from those licenses can run into the tens of millions annually for the most active institutions. Where the underlying research was federally funded, the resulting royalty income now enters the excise tax base. Universities that distinguish between federally funded and privately funded research projects in their accounting will need to track that distinction more rigorously to allocate income correctly between taxable and exempt categories.

Related-organization rules also tighten the calculation. Endowment assets held by foundations, trusts, and affiliated entities are counted in the institutional endowment for tier-calculation purposes unless the related organization is genuinely independent. Universities that historically held significant assets in legally separate but operationally affiliated entities now need to evaluate whether those entities meet the independence test. Failing the test means the assets count toward the per-student calculation and may push the institution into a higher tier.

For affiliated entities structured as C Corporations or S Corporations for unrelated business income tax purposes, the related-organization analysis adds another layer of structural review. Universities with complex affiliations may end up restructuring their relationships to clarify independence one way or the other.

How should major donors plan around the new tiers

Donors making large gifts to affected institutions should consider how their giving aligns with the institution's tier position. Three considerations matter most.

First, large new endowed gifts increase the institution's total endowment. If enrollment stays flat, endowment per student rises. For an institution sitting near a tier boundary, a major gift could push it across the line. The institution feels the tax effect, but donors evaluating impact-per-dollar of their gift may want to coordinate with institutional development offices on tier sensitivity.

Second, gifts directed to operating accounts rather than the endowment may carry slightly different effective leverage in the new environment, because operating gifts increase spendable income immediately while endowment gifts increase endowment principal subject to the new excise on its investment returns. Donors who care about visible programmatic impact may want to discuss gift-structure trade-offs explicitly with development staff.

Third, donor-advised fund contributions and direct gifts of appreciated securities continue to operate under their existing tax treatment for the donor. The institutional-side excise does not change the donor's federal income tax deduction or the capital gains exclusion on appreciated security gifts. Donors holding Augusta rule rental income from short-term home rentals or income from Oil and gas deduction investments can still deduct charitable contributions against those income sources within standard AGI limits.

Major donors who plan to Sell your home and direct sale proceeds toward a university gift should sequence the transactions to take advantage of both the Section 121 home sale exclusion and the charitable contribution deduction, neither of which is affected by Section 70415.

What disclosures must affected universities file

OBBBA tightens institutional reporting obligations. Affected schools must disclose tuition-paying U.S. student counts and endowment details in annual tax filings with sufficient specificity for the IRS to verify tier placement. Reporting deficiencies can trigger penalty assessments separate from the underlying tax liability.

Institutions should also review their cost accounting for federal grant-funded research to ensure that royalty income generated from such research is properly identified, segregated from royalty income from privately funded research, and reported correctly. Audit exposure on this point is real because the IRS now has a direct revenue interest in distinguishing between exempt and taxable royalty streams.

Tax advisors who work with university foundations or affiliated entities organized as Partnerships or other pass-through structures should review the entity-level reporting flow to ensure that investment income generated within those structures is correctly captured when consolidated into the parent institution's excise calculation.

How should advisors counsel donors and stakeholders

For wealth advisors counseling families with multi-generational university affiliations, three planning conversations make sense in 2026. The first is an updated assessment of which target institutions are now in higher tiers and how this may affect their spending plans, financial aid availability, and capital priorities. The second is a review of donor-advised fund balances earmarked for specific institutions to confirm that the timing and form of distributions still align with the family's intent in the new institutional tax environment. The third is integration with broader retirement planning, including Traditional 401k and Roth 401k sequencing in years when major gifts are planned.

For business owners with significant philanthropic programs flowing through closely held entities, Late S Corporation elections and entity-structure decisions affect charitable giving capacity at the personal level, even when they have no direct effect on the institutional excise tax.

How Instead supports endowment-aware giving plans

Section 70415 takes effect for institutional tax years beginning after December 31, 2025, meaning most affected institutions will begin paying under the new tiered rates in their 2026 fiscal year filings. For donors and advisors with active relationships at affected institutions, the new structure does not change the donor-side tax treatment. Still, it changes institutional incentives in ways that ripple back into gift conversations and long-term giving plans.

Visit Instead's comprehensive tax platform to model charitable giving alongside other tax strategies and ensure your annual giving plan remains coordinated with broader retirement and estate planning. Review pricing plans to find the tier that supports your level of giving complexity.

Frequently asked questions

Q: What is the highest rate under the new endowment excise tax?

A: The top tier is 21%, applying to private institutions with endowments exceeding $2 million per tuition-paying U.S. student. The 21% rate matches the federal corporate income tax rate, deliberately positioning the wealthiest endowments at parity with C corporation taxation rather than at the historically lower charitable rate.

Q: Does Section 70415 apply to public universities?

A: No. The provision applies only to private colleges and universities with at least 500 tuition-paying U.S. students and endowments of at least $500,000 per student. Public universities are excluded entirely. Religious institutions founded before 1776 with ongoing religious missions are also excluded under a narrow carveout.

Q: How is endowment-per-student calculated for tier placement?

A: The calculation divides the institution's total endowment value by the number of tuition-paying U.S. students. Assets held by related organizations (foundations, trusts, affiliates) are counted in the institutional endowment unless the related organization is genuinely independent. The calculated per-student value determines the tier in effect for a given tax year as of the institution's reporting date.

Q: Did OBBBA change what counts as taxable investment income?

A: Yes. Two new categories now enter the tax base. Interest income on student loans originated and held directly by the institution becomes taxable. Royalty income from federally funded patent activity also becomes taxable. Both categories were exempt under the prior flat-rate structure.

Q: How does this affect donor-side tax deductions for gifts to affected institutions?

A: It does not. Section 70415 imposes tax on the institution's investment income, not on donor contributions. Donors continue to receive the same federal income tax deduction for charitable contributions, including gifts of appreciated securities, that they did before OBBBA. The donor-side tax treatment is unchanged.

Q: When does the new tiered rate structure take effect?

A: Section 70415 applies to institutional tax years starting after December 31, 2025. For most affected institutions operating on a June 30 fiscal year, the first full year under the new structure runs July 1, 2026, through June 30, 2027. Calendar-year filers are subject to the new rates beginning January 1, 2026.