Columbia University’s tax-exempt status rests on two main pillars: federal recognition as a 501(c)(3) educational organization, which shields most of its income from federal tax, and New York State exemptions that lift property and sales taxes on property and purchases used for its educational mission. Neither exemption is absolute. Columbia still pays federal tax on business income unrelated to teaching and research, and starting with tax years after December 31, 2025, it faces a sharply expanded federal excise tax on endowment investment income.
What the Federal 501(c)(3) Designation Covers
The IRS classifies Columbia as a 501(c)(3) organization, the category for entities organized and operated exclusively for charitable, educational, scientific, or religious purposes. No part of the university’s net earnings may benefit any private shareholder or individual.1Internal Revenue Service. Exemption Requirements – 501(c)(3) Organizations Under that designation, Columbia pays no federal income tax on tuition revenue, donations, or income tied to its academic and research mission.
Investment returns from the endowment also generally escape ordinary income tax. Federal law excludes dividends, interest, royalties, and capital gains from an exempt organization’s taxable income when those earnings come from passive investments rather than an actively operated business.2Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income Columbia’s endowment stood at $15.9 billion as of June 30, 2025.3Columbia University. The Columbia Endowment – Fiscal Year 2025
The 501(c)(3) status also means gifts to Columbia are deductible on donors’ federal returns, within the usual AGI limits for charitable contributions.4Internal Revenue Service. Charitable Contribution Deductions
Federal Taxes Columbia Still Owes
Exempt does not mean untaxed. Two federal taxes reach even a well-endowed research university.
Unrelated Business Income Tax
Revenue from a trade or business that is regularly carried on and not substantially related to the university’s educational mission is taxed at the standard 21 percent corporate rate. Common examples at universities include sales of branded merchandise through a campus bookstore, advertising revenue from athletic events, and corporate-sponsored research where results remain proprietary rather than being published.2Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income Passive investment returns are specifically excluded, which is why endowment earnings generally escape this particular tax. An organization with $1,000 or more in gross unrelated business income must report it on IRS Form 990-T.
The Endowment Excise Tax
A separate excise tax targets private colleges and universities with large endowments relative to their student populations. For tax years beginning after December 31, 2025, a law enacted in July 2025 replaced the prior flat 1.4 percent rate with a three-tiered structure keyed to per-student endowment:5Office of the Law Revision Counsel. 26 USC 4968 – Excise Tax Based on Investment Income of Private Colleges and Universities
- 1.4 percent for per-student endowments between $500,000 and $750,000
- 4 percent for per-student endowments between $750,000 and $2 million
- 8 percent for per-student endowments above $2 million
The tax applies only to private institutions with at least 3,000 tuition-paying students, more than half of whom are in the United States, and a per-student endowment of at least $500,000. The per-student figure divides total assets by total students, excluding property used directly for exempt educational purposes such as classroom buildings.5Office of the Law Revision Counsel. 26 USC 4968 – Excise Tax Based on Investment Income of Private Colleges and Universities
Columbia’s $15.9 billion endowment spread across roughly 36,000 students puts its raw per-student figure near the $500,000 threshold, though the exact result depends on how much of the asset base counts as directly used for exempt purposes.3Columbia University. The Columbia Endowment – Fiscal Year 2025
New York Property Tax Exemption
Columbia’s largest single tax break comes from New York, not Washington. Real Property Tax Law Section 420-a grants a mandatory exemption for real property owned by nonprofit organizations and used exclusively for educational, charitable, religious, or hospital purposes.6New York State Senate. New York Code RPT 420-A – Nonprofit Organizations, Mandatory Class Classroom buildings, administrative offices, libraries, dormitories, and research laboratories all qualify.
The controlling word is “exclusively.” If Columbia leases part of a building to a commercial tenant, that portion loses the exemption and returns to the tax rolls. The statute allows a narrow exception when a nonprofit tenant occupies the space and the rent charged covers no more than the carrying, maintenance, and depreciation costs of that portion.7New York State Department of Taxation and Finance. Exemption Administration Manual, Part 2 – RPTL Section 420-a, Nonprofit Organizations, Mandatory Class A ground-floor space leased to a coffee chain does not qualify.
Sales and Use Tax Exemption
New York Tax Law Section 1116 exempts qualifying nonprofits from state and local sales taxes on purchases needed for their operations.8New York State Senate. New York Tax Code 1116 – Exempt Organizations Columbia presents vendors with a state-issued Exempt Organization Certificate, Form ST-119, to document a tax-free purchase of laboratory equipment, office furniture, or construction materials.9New York Codes, Rules and Regulations. 20 CRR-NY 529.7 – Religious, Charitable, Scientific, Literary or Educational Organizations
The combined New York City sales tax rate is 8.875 percent, made up of the 4 percent state rate, the 4.5 percent city rate, and a 0.375 percent Metropolitan Commuter Transportation District surcharge.10NYC.gov. Sales Tax The exemption only applies to purchases made with university funds for the exempt mission. A faculty member who pays out of pocket and seeks reimbursement cannot claim the exemption on that transaction.
What Columbia Must Do to Keep the Status
Federal exempt status is conditional on continued compliance. Three areas carry the sharpest consequences.
Operating for the Exempt Purpose
Columbia must be operated primarily for its stated exempt purpose, and no part of its net earnings may flow to any private individual or shareholder.11Internal Revenue Service. Inurement/Private Benefit – Charitable Organizations Competitive compensation for the president and senior faculty is allowed, provided pay is reasonable for the services rendered. When a nonprofit insider receives an excessive benefit, the IRS can impose an excise tax of 25 percent of the excess on the individual, with an additional 200 percent penalty if the problem is not corrected in time.
Annual Reporting
Columbia must file IRS Form 990 every year. It is a public document disclosing revenues, expenses, executive compensation, and governance. Any exempt organization with gross receipts of $200,000 or more, or total assets of $500,000 or more, files the full Form 990.12Internal Revenue Service. Form 990 Series – Which Forms Do Exempt Organizations File At Columbia’s scale (gross receipts well above $1,208,500), a late return runs $120 per day up to $60,000.13Internal Revenue Service. Late Filing of Annual Returns Three straight years of nonfiling produces automatic loss of exempt status.
Political Activity and Lobbying
Federal law absolutely prohibits a 501(c)(3) organization from participating in any political campaign for or against a candidate. The ban covers contributions, endorsements, and any candidate-related statement made on the organization’s behalf. Violation can trigger revocation and excise taxes.14Internal Revenue Service. Restriction of Political Campaign Intervention by Section 501(c)(3) Tax-Exempt Organizations
Lobbying is treated differently. A 501(c)(3) may lobby, but lobbying cannot form a “substantial part” of the organization’s overall activities, measured by both time and money against total activity. Crossing the line costs the exemption and produces a 5 percent excise tax on the year’s lobbying expenditures, with a matching 5 percent tax possible on managers who knowingly approved the excess.15Internal Revenue Service. Measuring Lobbying – Substantial Part Test Nonpartisan voter education, public forums, and voter registration drives remain permitted so long as they do not favor a candidate.
What the Exemption Does Not Erase
Tax-exempt institutions still use city services like fire protection, policing, and street maintenance without contributing through the property tax base. Payments in Lieu of Taxes, or PILOTs, are voluntary agreements in which nonprofits offer cash or community benefits to local governments to help close that gap.16New York City Independent Budget Office. Understanding Payments in Lieu of Taxes They are negotiated, not legally required.
Columbia’s largest such commitment is tied to the Manhattanville campus expansion in West Harlem. The university pledged $76 million to the West Harlem Development Corporation for local benefits, $20 million to an affordable housing fund, up to $4 million in housing legal assistance for neighborhood residents, $20 million to a state development subsidiary focused on community revitalization, $1 million for a medical technician training program, and $20 million in in-kind access to campus facilities and services.17Columbia University. Community Commitments These payments sit outside the tax code but represent a real financial cost that accompanies exempt status in practice.