A corpus fund is the permanent principal of a nonprofit’s endowment: money a donor has restricted so that the original gift can never be spent, while the investment returns it generates pay for the organization’s programs year after year. The structure is designed to last forever. In nearly every U.S. state, the rules for investing and spending from these funds come from the Uniform Prudent Management of Institutional Funds Act (UPMIFA), which sets fiduciary standards, spending guardrails, and the process for handling donor restrictions that no longer make sense.
The Basic Idea
“Corpus” means body or principal. In nonprofit finance, it refers to a pool of donated money that the donor has directed be kept intact in perpetuity. The organization invests the corpus and spends only what the investments earn: interest, dividends, and appreciation. The tree stays in the ground; the fruit is what feeds the mission.
A $1 million corpus gift might generate $40,000 to $50,000 of spendable income each year, indefinitely. What makes the gift a corpus fund, legally, is the donor’s written instrument creating the restriction. Without that explicit written direction, the money is a regular donation the nonprofit can spend however it chooses.
A Corpus Fund Is Not a Board-Designated Reserve
Nonprofits sometimes move their own money into what looks like an endowment: a board-designated fund, or quasi-endowment. On a balance sheet the two can appear similar, but they behave differently. A board-designated reserve can be undone by the same board that created it; if cash gets tight, a vote unlocks it. A true corpus fund is locked by the donor’s restriction, and the board cannot override that on its own. Releasing donor-restricted principal requires the donor’s consent or a court order.
Where Corpus Funds Fit in Nonprofit Accounting
Since 2018, the accounting rules under FASB Topic 958 recognize two categories of net assets: those without donor restrictions and those with donor restrictions.1Financial Accounting Standards Board (FASB). Not-for-Profit Entities (Topic 958) – Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made Within the restricted category, some funds are limited by a time period or a specific purpose and eventually become available for general use. Others are restricted in perpetuity. A corpus fund lives in that second group. A $50,000 gift restricted to scholarships for three years will one day become unrestricted; a $50,000 gift to a permanent scholarship corpus never will.
How Spending Works Under UPMIFA
UPMIFA, adopted in 49 states, is the framework that tells a nonprofit how much it can spend from a corpus fund and under what conditions. The older rules fixated on protecting the original dollar value of every gift. UPMIFA takes a longer view: preserve the fund’s purchasing power over time, and let the board make prudent appropriations from accumulated returns.
Before authorizing spending, fiduciaries must weigh seven factors:
- How long the fund is meant to last and whether the proposed spending supports that timeline
- The mission of the organization and the specific fund
- General economic conditions
- The effect of inflation or deflation on purchasing power
- Expected total return from investments
- Other resources available to the organization
- The organization’s own investment policy
In practice, most organizations translate these factors into a written spending policy that distributes roughly 4% to 5% of the fund’s average market value each year, measured over a trailing period to smooth out short-term swings. States that adopted UPMIFA’s optional Section 4(d) go further: they create a legal presumption that spending above 7% of a fund’s fair market value is imprudent. A board can still exceed 7%, but the burden shifts to it to prove the decision was reasonable.
When a Fund Goes Underwater
A market downturn can push a corpus fund’s market value below the amount originally given. Under the older rules, this froze distributions until the fund recovered. UPMIFA lets a nonprofit keep making prudent distributions from an underwater fund, provided the board considers the same seven factors and reaches a good-faith judgment that spending is appropriate. The standard is applied when the decision is made, not with hindsight, so a later drop doesn’t automatically expose the board to liability.
Underwater funds do carry extra disclosure obligations. The organization must report the board’s interpretation of applicable spending law, its policy on spending from underwater funds, and the aggregate fair value, original gift amounts, and total shortfall of all underwater endowment funds.1Financial Accounting Standards Board (FASB). Not-for-Profit Entities (Topic 958) – Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made
Investment Standards
UPMIFA requires anyone managing a corpus fund to act in good faith and with the care that a reasonably prudent person in a similar position would use. That is a legal standard, not a slogan. It rules out concentrating the corpus in a single stock, chasing speculative returns, or letting the money sit in a low-yield account while inflation erodes it. Diversification, an appropriate risk-return balance, a long horizon, tax awareness, and adequate liquidity are all part of the duty.
Most organizations adopt a written Investment Policy Statement that spells out permissible asset classes, target allocations, rebalancing rules, and benchmarks. Boards frequently hire outside investment managers, but the board keeps ultimate fiduciary responsibility regardless of who runs the portfolio day to day.
How a Corpus Fund Is Created
A corpus fund starts with a written gift agreement between the donor and the nonprofit. That document is the legal backbone of the arrangement, and imprecise language has caused expensive court fights decades later. A well-drafted agreement clearly states that the fund is permanently restricted and that the principal is to be maintained in perpetuity. It specifies what earnings can be used for, but in terms broad enough that the organization isn’t locked into funding something that may not exist in fifty years.
Rather than pinning down a specific spending rate, a good agreement references the organization’s endowment spending policy as it exists from time to time, so the board can adjust as economic conditions change without violating donor intent. A flexibility clause allowing the board to redirect the fund’s purpose if the original use becomes impossible or impractical spares the organization from having to go to court later. The donor can help draft that language so any future change still fits their general charitable intent.
Tax Treatment for Donors
A gift to a corpus fund gets the same federal income tax treatment as any other charitable contribution under Section 170 of the Internal Revenue Code, subject to the percentage-of-AGI limits.2Office of the Law Revision Counsel. 26 U.S. Code 170 – Charitable, Etc., Contributions and Gifts For 2026, cash gifts to qualifying public charities are deductible up to 60% of the donor’s adjusted gross income. A new rule effective in 2026 creates a floor: charitable contributions are only deductible to the extent they exceed 0.5% of the donor’s AGI, so the first slice of giving produces no tax benefit at all.
Donors who give appreciated property instead of cash face a lower AGI cap of 30% for most gifts to public charities. In exchange, they avoid capital gains tax on the appreciation, which can make appreciated stock or real estate a particularly efficient way to fund a corpus gift. Contributions above the applicable AGI cap can be carried forward and deducted over the next five tax years.
Documentation gets stricter as the gift gets bigger. Cash contributions of $250 or more require a written acknowledgment from the nonprofit stating the amount and whether any goods or services were provided in return. Non-cash gifts valued above $5,000 require a qualified independent appraisal and a completed Form 8283 filed with the return. The donor must have all required substantiation by the earlier of the filing date or the return’s due date, including extensions.2Office of the Law Revision Counsel. 26 U.S. Code 170 – Charitable, Etc., Contributions and Gifts Missing those deadlines forfeits the deduction, however legitimate the gift.
The charitable deduction only helps a donor who itemizes. The 2026 standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One Big Beautiful Bill A corpus gift has to be large enough, on its own or combined with other deductions, to clear that threshold before it produces tax savings.
Changing a Fund’s Purpose
Perpetuity is a long time, and sometimes a fund’s stated purpose stops making sense. A scholarship endowment for a department that no longer exists, or a fund tied to a medical condition that has been eradicated, needs a path forward.
UPMIFA offers two routes without court involvement. If the donor is alive and willing, the organization and donor can simply agree to modify the restriction. For small, old funds, generally those worth less than $25,000 that have existed for more than 20 years, though states may adjust these thresholds, the organization can modify the restriction after notifying the state attorney general and redirecting the fund toward a purpose consistent with the donor’s original charitable intent.
For larger or newer funds where the donor is unavailable, the traditional remedy is the cy pres doctrine. The organization goes to court and shows that the original purpose is no longer feasible; if the court agrees, it redirects the fund to a purpose as close as possible to the donor’s original intent. Slower and more expensive than the small-fund route, but often the only option.
Oversight and What Happens When Boards Get It Wrong
State attorneys general are the primary regulators of nonprofit endowments. Their authority covers whether charitable assets are properly managed, whether directors are meeting their fiduciary duties, and whether restricted funds are actually being used for their stated purposes.4National Association of Attorneys General. Charities Regulation 101 A board that spends restricted principal without authorization, fails to invest prudently, or diverts endowment income to unauthorized purposes can face enforcement action.
Consequences range from mandatory compliance monitoring and reporting to personal liability for board members who authorized improper spending. In extreme cases, the attorney general can seek to dissolve the organization entirely.4National Association of Attorneys General. Charities Regulation 101 The business judgment rule generally protects directors who followed a careful process, weighed the UPMIFA factors, and documented what they did. That protection evaporates when the process was sloppy, self-interested, or nonexistent. That is why investment policies, spending policies, meeting minutes, and separate ledgers for each corpus fund matter. When a donor’s family, a regulator, or an attorney general asks how a decision was made, the paper trail is the answer.