Private Foundation
Every organisation granted 501(c)(3) status starts as a private foundation. Public charity is the status you earn away from that default.
- Instrument
- The default classification
- Obliges
- Every exempt organisation, unless it can show public support.
Plate 01 · Private foundationthe residual 501(c)(3) classification; assigned unless public charity status is proved
What Makes a Foundation
When the IRS grants 501(c)(3) status, it does not automatically confer public charity classification. The Internal Revenue Code makes private foundation the residual category: an organisation is one unless it affirmatively demonstrates that it qualifies as something else. That something else is usually public charity status, established by passing the public support test — a mathematical measure of how broadly the organisation draws its revenue. Fail to demonstrate public support, and foundation status is what remains.
The practical consequence is asymmetry. Public charities must keep proving their broad support on a rolling five-year basis. A private foundation, by contrast, simply is one — no periodic test, no renewal of that classification. The IRS determination letter will say which side of the line the organisation sits on, and most foundations sit on the foundation side because they are funded by a single donor, a family, or a corporation rather than by the general public.
That funding structure is exactly what the law is tracking. Congress drew the distinction in the Tax Reform Act of 1969 because concentrated private wealth funding an organisation creates a different accountability problem than diffuse public support does. A foundation answers primarily to its donors and its board. A public charity answers, at least in theory, to the broad public whose contributions sustain it.
The Rules That Follow From the Classification
Private foundation status comes with a set of excise taxes and mandatory rules that have no parallel in public charity law. Four constraints define day-to-day operation.
Mandatory distributions. A private foundation must distribute at least five percent of the fair market value of its investment assets each year for charitable purposes. Miss the threshold and the IRS imposes an excise tax on the shortfall. The five-percent rule forces active grantmaking even when a board would prefer to let assets grow.
Self-dealing prohibitions. Transactions between a foundation and its disqualified persons — founders, substantial contributors, officers, directors, and their family members — are broadly prohibited. Selling property to the foundation, lending it money, paying compensation that is not reasonable: these are self-dealing violations that trigger excise taxes on the individual, not just the organisation. The logic echoes the excess benefit rules for public charities but is considerably stricter in its structure.
Plates 02–03 · Fiscal sponsorship and The public support test
Plate 02 · Fiscal sponsorshipFiscal sponsorship — A project operating under another organisation’s exemption, and the sponsor that keeps control of the funds. Read that entry.
Plate 03 · The public support testThe public support test — Public charities, on a rolling five-year window of their own revenue. Read that entry.
Jeopardising investments. Speculative investments that put the foundation's assets at risk for a non-charitable purpose attract their own excise tax. The standard is not absolute prohibition of risk, but trustees bear real legal exposure when they chase yield in ways that look inconsistent with prudent stewardship.
Taxable expenditures. Grants to individuals require a formal pre-approval procedure. Grants to organisations that are not themselves public charities require expenditure responsibility — the foundation must track how the money is used and report back. Lobbying and electioneering are taxable expenditures. These rules substantially shape the grantmaking practice of every foundation, down to the structure of grant letters and reporting requirements.
The Form 990-PF
Foundations file the Form 990-PF rather than the standard 990. The return lists every grant made during the year, by recipient name and amount — a level of granularity that makes foundation filings among the most informative public documents in the sector. Researchers, journalists and other funders use 990-PF data to map the flow of philanthropic capital across fields and geographies. Candid ↗, which absorbed the Foundation Center ↗ in 2019, maintains a database built substantially on this disclosure.
The 990-PF also reports investment income separately and calculates the minimum distribution requirement on the face of the return, making compliance with the five-percent rule visible in the public record. A foundation that falls short leaves an unmistakable trail.
Public charity — earned by passing the public support test or fitting a statutory category (church, school, hospital)
Not One Thing
"Private foundation" covers genuinely different operating models. An operating foundation runs its own programmes and can count those expenditures toward its distribution requirement. A pass-through foundation makes grants and distributes more than the minimum. A family foundation may employ no staff and conduct all its business at a single annual board meeting. The classification is a legal category with shared rules, not a description of how an organisation actually works — and the variation inside it is wide.