A nonprofit endowment is a pool of donated money invested for the long term, where the original gift stays intact and the organization spends only the earnings. Understanding how nonprofit endowments work means understanding three overlapping rulebooks at once: the donor’s gift agreement, the state prudence law known as UPMIFA, and the IRS reporting rules that apply to any tax-exempt organization holding endowment assets. Get those three right and the fund does its job for decades. Get them wrong and the organization can face donor lawsuits, state attorney general action, excise taxes, or loss of tax-exempt status.
The Three Types of Endowment Funds
Not every fund called an endowment carries the same legal weight. The category controls what the board can and can’t do with the principal.
- Permanent (true) endowment. The donor’s gift instrument requires the principal to stay invested indefinitely. Only investment income and appreciation can be spent, subject to the organization’s spending policy. This is the most restrictive form.
- Term endowment. The donor restricts the principal for a set number of years or until a triggering event. Once the restriction expires, the full balance becomes available. These are sometimes used to fund a capital project on a future date.
- Board-designated (quasi) endowment. The board voluntarily sets aside unrestricted funds to function like an endowment. Because no donor restriction exists, the board can vote to liquidate at any time. It gets the discipline of long-term investing without the legal permanence of a donor-restricted gift.
The IRS recognizes all three and requires organizations to report their endowment holdings by type on Schedule D of Form 990.1Internal Revenue Service. Instructions for Schedule D (Form 990) Misclassifying a board-designated fund as permanently restricted, or vice versa, can create problems with donors, auditors, and state regulators.
What the Gift Agreement Has to Do
The gift instrument is the legal backbone of any donor-restricted endowment. Sloppy drafting creates ambiguity that boards, donors, and courts fight over for decades.
The most important clause defines the donor’s restricted purpose. Vague language like “for the benefit of the organization” gives the board wide discretion but may not reflect what the donor actually intended. Specific language identifying a scholarship program, a research initiative, or a facility maintenance fund prevents future disputes. The agreement should also record the initial gift amount, which establishes the historical dollar value used to track whether the fund has fallen below its original contribution level.
Administrative fees deserve their own provision. Many nonprofits charge between 0.5% and 2% annually to cover internal oversight and external investment management, with community foundations often capping fees around 1%. Spelling out the fee calculation and who approves changes avoids surprises on both sides.
A modification clause matters too. The legal doctrine of cy pres allows a court to redirect endowment funds to a similar charitable purpose when the donor’s original intent can no longer be carried out. UPMIFA builds a version of this into its framework, letting the institution — sometimes with attorney general approval — modify restrictions on older, smaller funds without going to court. Including modification language in the gift instrument itself streamlines the process and protects the donation from becoming stranded by changing circumstances.
The agreement should also specify when the fund becomes active, especially if the donor plans to build the endowment over time toward a minimum threshold before distributions begin.
How Much a Nonprofit Can Spend Each Year
Nearly every state has adopted the Uniform Prudent Management of Institutional Funds Act (UPMIFA), which replaced an older, more rigid framework that prohibited spending from an endowment whenever its market value dropped below the original gift amount. Under UPMIFA, boards apply a prudence standard rather than a bright-line dollar threshold. Before approving any distribution, the board must weigh seven factors:
- Duration and preservation of the fund.
- The mission of the organization and the specific fund’s purpose.
- General economic conditions.
- The possible effect of inflation or deflation.
- Expected total return from income and appreciation.
- Other resources available to the organization.
- The organization’s investment policy.
In practice, most organizations settle on an annual spending rate between 3.5% and 5%, applied to a rolling average of the fund’s market value over three to five years. The rolling average smooths out any single bad or exceptional year, so the operating budget doesn’t swing with the market. Each distribution should be approved by a formal vote of the investment committee, with the deliberation documented in the meeting minutes. Those records are the board’s best defense if anyone later claims the spending decisions were reckless.
The investment side carries the same prudence obligation. The board must diversify assets, keep costs reasonable relative to the portfolio size, and review the asset allocation at least quarterly to confirm it still fits the organization’s risk tolerance and time horizon.
When the Endowment Falls Underwater
An endowment is “underwater” when its current market value drops below the amount originally contributed by the donor. This happens more often than boards expect during extended market downturns, and the instinct to freeze all spending is understandable but not legally required.
Unlike the old rules, UPMIFA allows continued spending from an underwater fund as long as the board determines that doing so is prudent. The same seven factors apply, but the stakes are higher because the board is effectively spending into the original gift. There is no legal requirement to restore the fund’s value from operating assets, but the board should document why continued distributions still serve the fund’s long-term purpose.
Boards handling underwater funds should set a floor value below which they will suspend distributions entirely. Some set it at the original gift amount, while others index it to preserve purchasing power. Clear disclosure in the financial statements matters here: it prevents donors and auditors from incorrectly concluding that the organization must replenish the shortfall from its operating budget.
Extra Rules for Private Foundations
Public charities and private foundations both hold endowments, but foundations face a layer of federal rules that public charities do not. Any 501(c)(3) is classified as a private foundation by default unless it demonstrates enough public support to qualify as a public charity. The public support test generally requires that more than one-third of the organization’s revenue comes from public contributions, grants, and program revenue rather than investment income.2Office of the Law Revision Counsel. 26 USC 509 – Private Foundation Defined
1.39% Excise Tax on Investment Income
Private foundations pay a 1.39% federal excise tax on net investment income every year.3Office of the Law Revision Counsel. 26 USC 4940 – Excise Tax Based on Investment Income Net investment income includes interest, dividends, rents, royalties, and capital gains from the endowment portfolio. Public charities don’t owe this tax.
Mandatory 5% Annual Payout
Private foundations must distribute at least 5% of the fair market value of their non-charitable-use assets each year for charitable purposes.4Office of the Law Revision Counsel. 26 USC 4942 – Taxes on Failure to Distribute Income This “minimum investment return” includes grants, program expenses, and reasonable administrative costs tied to charitable activities. A foundation that misses the required amount owes an initial excise tax of 30% on the undistributed income.5Internal Revenue Service. Taxes on Failure to Distribute Income – Private Foundations If the shortfall isn’t corrected after IRS notification, an additional 100% tax applies to whatever remains undistributed.
Foundations can carry forward excess distributions for five years, which provides a buffer in years when grantmaking exceeds the minimum. They can also set aside funds for up to 60 months for qualifying major projects. Public charities have no federally mandated payout floor.
Self-Dealing Prohibitions
Private foundations are barred from financial transactions with “disqualified persons,” a category that includes substantial donors, foundation managers, and their family members. Prohibited transactions include selling or leasing property, lending money, paying unreasonable compensation, and transferring foundation income or assets for a disqualified person’s benefit.6Office of the Law Revision Counsel. 26 U.S. Code 4941 – Taxes on Self-Dealing
The penalties are steep. The self-dealer owes an initial tax of 10% of the amount involved for each year the violation continues, and a foundation manager who knowingly participates faces a 5% tax capped at $20,000 per act. If the transaction isn’t corrected, second-tier taxes escalate to 200% for the self-dealer and 50% for the manager. A foundation manager who rents office space from a major donor at a below-market rate, for example, has triggered a self-dealing violation regardless of how favorable the terms look.
When Endowment Earnings Get Taxed
Tax-exempt organizations generally don’t pay income tax on endowment earnings, but there is an important exception. When a nonprofit earns income from a regularly conducted business activity that isn’t substantially related to its exempt purpose, that revenue becomes unrelated business taxable income (UBTI).7Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income
Most traditional endowment earnings escape UBTI because the tax code excludes passive income: dividends, interest, rents from real property, royalties, and capital gains are all carved out. The trouble starts when endowments move into alternative investments.
Income from debt-financed property loses the passive-income exclusion in proportion to the leverage used to acquire it.8Office of the Law Revision Counsel. 26 USC 514 – Unrelated Debt-Financed Income If an endowment borrows money to buy real estate and earns rental income, a portion of that rental income becomes taxable. Partnership income is another common trigger: income flowing through from a partnership interest, even to a passive investor, can be treated as UBTI. Endowments that invest in hedge funds, private equity, or leveraged real estate funds should model the UBTI exposure before committing capital.
Any tax-exempt organization with $1,000 or more in gross unrelated business income during the year must file Form 990-T and pay the resulting tax.9Internal Revenue Service. Instructions for Form 990-T The code provides a $1,000 specific deduction, so organizations with minimal UBTI may owe nothing, but the filing obligation still kicks in once the threshold is crossed.
Reporting the Endowment on Form 990
Tax-exempt organizations file Form 990 annually to give the IRS financial and operational information.10Internal Revenue Service. About Form 990, Return of Organization Exempt From Income Tax Any organization holding endowment funds also completes Part V of Schedule D, which is dedicated entirely to endowment reporting.1Internal Revenue Service. Instructions for Schedule D (Form 990)
Part V asks for beginning and ending balances, new contributions, net investment performance, grants and scholarships paid out, other program distributions, and administrative expenses. The total endowment then gets broken out into the three categories (permanent, term, and board-designated), following the accounting standards under FASB ASC 958. The numbers should reconcile with the organization’s audited financial statements.
The consequences of skipping the filing are severe. A nonprofit that fails to file Form 990 for three consecutive years automatically loses its tax-exempt status.11Internal Revenue Service. Automatic Revocation of Exemption Revocation is effective on the filing due date of the third missed return. Once revoked, the organization pays federal income tax on all revenue, donors can no longer claim charitable deductions, and the organization is removed from the IRS’s list of eligible charities. Reinstatement requires a new exemption application and, in many cases, paying back taxes for the revocation period. Even short of that, inaccurate endowment reporting can trigger IRS scrutiny and penalties.
State Attorney General Oversight
Federal tax compliance is only part of the regulatory picture. In most states, the attorney general is the primary enforcer of charitable asset restrictions, an authority that traces back to English common law and remains the prevailing framework across the country today.
State attorneys general can investigate and sue nonprofits for misusing restricted endowment funds, breaching fiduciary duties, wasting charitable assets, or engaging in self-dealing. If a nonprofit diverts permanently restricted endowment money to cover operating shortfalls without legal authority, the attorney general’s office has standing to seek restitution and an injunction. UPMIFA specifically gives the attorney general a role in overseeing how institutions manage endowment restrictions, and many states require attorney general approval or court involvement before an organization can modify a donor’s restrictions on older or smaller funds.
Most states also require nonprofits that solicit donations to register with a state charitable solicitation office, often housed within the attorney general’s department. Registration fees and renewal rules vary widely. Organizations that solicit across state lines may need to register in every state where they actively fundraise, which creates a significant administrative burden for nationally focused nonprofits.