When the IRS recognizes your organization under section 501(c)(3), it also decides a second question: is your organization a public charity or a private foundation? The answer shapes your annual return, how much your donors can deduct, and which excise taxes can apply. It is worth understanding before you file Form 1023 or Form 1023-EZ, because both forms ask you to choose.
The starting presumption
Under IRC 509(a), every 501(c)(3) organization is a private foundation unless it fits one of four exceptions. A public charity is simply a 501(c)(3) that fits an exception. A private foundation is one that does not, which usually means it is funded by one person, one family or one company, and it often makes grants rather than running programs.
Most founders reading this guide are building organizations that will raise money from many people. Those organizations nearly always qualify as public charities. The work is in knowing which category fits and keeping the numbers that prove it.
The four public charity categories
| Category | Who it fits | How it qualifies |
|---|---|---|
| 509(a)(1) | Churches, schools, hospitals, government units, and "publicly supported" organizations under 170(b)(1)(A)(vi) | Either by what it is (a church or school) or by passing the one-third public support test |
| 509(a)(2) | Organizations that earn much of their revenue from mission-related fees, tickets or sales, such as a community theater | A different one-third test that counts program revenue, with a cap on investment income |
| 509(a)(3) | Supporting organizations that exist to support one or more specific public charities | A required relationship with the supported organization (Type I, II or III), not a support test |
| 509(a)(4) | Organizations testing for public safety | Rarely used |
The 509(a)(1) public support test
Most donation-funded nonprofits qualify under 509(a)(1) as "publicly supported" organizations described in IRC 170(b)(1)(A)(vi). Here is how the test works, using the Schedule A (Form 990) instructions and Treasury Regulation 1.170A-9(f).
Five-year window. Support is measured over a five-year computation period: the current tax year and the four before it.
What counts as public support. Gifts, grants and contributions from individuals, companies and foundations; contributions from government units; grants from other publicly supported charities; tax revenues levied for your benefit; and the value of services or facilities a government unit gives you free of charge.
The 2% limit. Each donor's total gifts over the five years count as public support only up to 2% of your total support for the period. Gifts from a donor and certain related people, such as a spouse and family members, are combined. The 2% limit does not apply to government units or to other publicly supported charities.
What counts as total support. Everything in public support (before the 2% cut), plus investment income such as interest, dividends, rents and royalties, net income from unrelated business, and other income. Gross receipts from your related program activities are left out of total support under this test, although you report them separately on Schedule A.
The thresholds. You pass if public support is at least 33⅓% of total support. If you fall short but reach at least 10%, you can still qualify under the facts-and-circumstances test, which looks at whether you run a real, continuing fundraising program aimed at the public and at factors such as a board that represents community interests.
A hypothetical youth robotics program, years one through five. The founder's family gave $350,000. Dozens of other donors gave $60,000 in all, and no one else gave more than $8,000. Investment income was $10,000.
- Total support: $350,000 + $60,000 + $10,000 = $420,000
- 2% limit: 2% of $420,000 = $8,400
- The family's gifts count only up to $8,400, so $341,600 is excluded
- Public support: $410,000 − $341,600 = $68,400
- Public support percentage: $68,400 ÷ $420,000 = 16.29%
The program misses 33⅓% but clears 10%, so it must rely on the facts-and-circumstances test. If other donors had given $200,000 instead of $60,000 (with no one else over $11,200), total support would be $560,000, the 2% limit $11,200, public support $211,200, and the percentage 37.71%, a clear pass.
You can run your own numbers with the calculator below.
The 509(a)(2) test for fee-based organizations
If your revenue comes largely from program fees, admissions or sales related to your mission, 509(a)(2) may fit better. Under IRC 509(a)(2), you must:
- Normally receive more than one-third of your support from gifts, grants, contributions, membership fees, and gross receipts from related activities. Receipts from any one person or government agency count only up to the greater of $5,000 or 1% of your support for the year, and support from disqualified persons (substantial contributors, board members, officers and their families) does not count as public support at all.
- Normally receive not more than one-third of your support from gross investment income plus net unrelated business income after tax.
The same five-year computation period applies, and the Schedule A instructions use the same first-five-years treatment described below.
The first five years
Since 2008 there is no "advance ruling" period. Under Treasury Regulation 1.170A-9(f)(4)(v), a new organization is treated as meeting the public support test for its first five tax years as a 501(c)(3) if it can reasonably be expected to meet it during that period. On Schedule A, you simply check the "first five years" box.
The real computation begins in year six. You pass year six if your support over years two through six meets the test, or, alternatively, if your support over years one through five did. The Schedule A instructions recommend running the numbers privately during years one through five so year six holds no surprises. If you fail in year six and later, you are treated as a private foundation and switch to Form 990-PF. Our sister site explains the schedule line by line in its guide to the Schedule A public support test.
Plan your fundraising, not just your filing. An organization funded mainly by one large donor can be a perfectly good charity, but it will struggle to stay a public charity after year five. If that describes your plan, decide early whether to broaden the donor base, look at 509(a)(2) or 509(a)(3), or accept private foundation status on purpose.
What private foundation status means
Private foundations are legitimate and common, but they follow a stricter rulebook in Chapter 42 of the Internal Revenue Code. The main differences:
- Excise tax on investment income. IRC 4940 imposes a tax of 1.39% of net investment income each year.
- Minimum payout. IRC 4942 requires a non-operating foundation to distribute a minimum amount each year, based on a "minimum investment return" of 5% of the value of assets not used directly for charitable purposes. Undistributed amounts face an initial tax of 30%.
- Self-dealing ban. IRC 4941 prohibits most financial transactions between the foundation and its disqualified persons, such as sales, loans, leases and excessive pay, even when the terms are fair. Taxes fall on the self-dealer and, in some cases, on managers who approve the deal.
- Other limits. Rules on excess business holdings (4943), jeopardizing investments (4944) and taxable expenditures (4945) restrict how a foundation invests and how it makes grants, including grants to individuals and to non-charities.
- Annual return. Every private foundation files Form 990-PF, whatever its size. Public charities can often file Form 990-N or 990-EZ instead (see annual filing requirements).
- Donor deductions. IRC 170(b) generally lets an individual deduct cash gifts to a public charity up to 60% of their contribution base (roughly adjusted gross income), compared with 30% for cash gifts to most private foundations.
How to choose on your application
On Form 1023, you select a foundation classification and support it with your budget and fundraising plan. Be realistic. If your projected budget shows one source paying for nearly everything, the IRS may ask questions or classify you differently. If you are unsure whether you will be expected to pass, our Form 1023 vs. 1023-EZ guide explains which form fits, and our 501(c)(3) requirements guide covers the rest of what the IRS looks for.
Frequently asked questions
Can a public charity later become a private foundation, or the reverse?
Yes. A public charity that fails its public support test after year five is treated as a private foundation and files Form 990-PF. A private foundation can end that status only through the termination rules in IRC 507, one of which involves operating as a public charity for a continuous 60-month period. Form 8940 is used for related IRS requests.
Do grants from other charities count as public support?
Grants from other publicly supported charities count in full under the 509(a)(1) test and are not subject to the 2% limit. Grants from private foundations count as public support but only up to the 2% limit, like any other donor.
What is an unusual grant?
An unusual grant is a large, unexpected gift from a disinterested donor, attracted by your public nature, that is big enough to threaten your public support percentage. Qualifying unusual grants are excluded from both public support and total support, so they do not sink your test. Keep records of each one.
Does the founder's own giving disqualify us?
No. The founder's gifts count, but only up to the 2% limit under 509(a)(1). Under 509(a)(2), gifts from substantial contributors and board members do not count as public support at all, so a founder-funded organization usually fares better under 509(a)(1).
Is a church subject to the public support test?
No. Churches are public charities under 509(a)(1) because of what they are, not because of their funding. See our guide to churches and 501(c)(3) status.
Sources
- IRS: Instructions for Schedule A (Form 990) (2025). irs.gov
- IRS: Publication 557, Tax-Exempt Status for Your Organization (Rev. January 2025). irs.gov
- eCFR: 26 CFR 1.170A-9, Definition of section 170(b)(1)(A) organization. ecfr.gov
- Cornell LII: 26 U.S. Code 509, Private foundation defined. law.cornell.edu
- Cornell LII: 26 U.S. Code 4940, Excise tax based on investment income. law.cornell.edu
- Cornell LII: 26 U.S. Code 4942, Taxes on failure to distribute income. law.cornell.edu
IRS forms, fees and inflation-adjusted amounts change. We review this page when the IRS publishes new instructions.
501Nonprofit.com is a private company, not the IRS. This page is general information, not legal or tax advice for your organization. Example organizations and figures are hypothetical.
