To qualify for public charity status under Section 170(b)(1)(A)(vi), your organization must show that at least one-third of its total financial support comes from the general public or government sources, measured over a rolling five-year window that includes the current tax year and the four preceding years.1Internal Revenue Service. Exempt Organizations Annual Reporting Requirements – Form 990, Schedules A and B: Public Charity Support Test You elect the classification when you file Form 1023, and you prove it each year afterward on Schedule A of Form 990. Organizations that fall short of one-third have a narrower backup route: reach 10 percent and satisfy a facts-and-circumstances showing. Everything else is mechanics.
Because every 501(c)(3) is presumed to be a private foundation until it proves otherwise, this classification is what keeps you out of the private foundation regime.2Office of the Law Revision Counsel. 26 U.S. Code 509 – Private Foundation Defined
The One-Third Public Support Test
The primary path is arithmetic. Divide public support by total support across the five-year measurement period. If the result is 33 1/3 percent or higher, you qualify automatically, with no IRS discretion involved.
The numerator (public support) captures contributions from individuals, corporations, trusts, other public charities, and governmental units, subject to the caps below. The denominator (total support) sweeps in nearly every dollar of financial inflow, including investment income and membership fees.3eCFR. 26 CFR 1.170A-9 – Definition of Section 170(b)(1)(A) Organization The rolling five-year average protects you from a single bad year and prevents a single windfall year from masking a slow decline.
Two categories of money go into the numerator at their full amount with no cap: contributions from government agencies (federal, state, or local), and grants from organizations already classified as 170(b)(1)(A)(vi) public charities. Because those charities have already proven their broad support, the IRS treats their grants as pass-through public funding. Government-funded organizations tend to pass this test easily for exactly this reason.
The 2 Percent Cap on Individual Donors
Gifts from any single person, company, or trust count as public support only up to 2 percent of your total support for the entire five-year period.4eCFR. 26 CFR 1.170A-9 – Definition of Section 170(b)(1)(A) Organization Anything above the cap still shows up in the denominator. This is the mechanism that forces genuine breadth.
Say your total support over five years is $1,000,000. The 2 percent cap is $20,000 per source. If one donor gave you $100,000 across that window, only $20,000 counts as public support. The full $100,000 still sits in the denominator. That single donor inflates the denominator while contributing a capped amount to the numerator, pulling your percentage down from both directions.
Government agencies and other 170(b)(1)(A)(vi) organizations are exempt from the 2 percent cap. A $500,000 federal grant flows into both the numerator and the denominator at full value.
What Inflates the Denominator Without Helping
Several income streams count as total support but never as public support. They work against you.
- Gross investment income (interest, dividends, rents) enters the denominator only.
- Gross unrelated business income enters the denominator only.
- The portion of any individual, corporate, or trust contribution above the 2 percent cap enters the denominator without a matching numerator entry.
Capital gains are the exception in the other direction: they are excluded from both the numerator and the denominator entirely, so a large realized gain on an investment portfolio does not distort the calculation either way.5Internal Revenue Service. Public Support Tests for Public Charity Status
An organization heavily reliant on investment returns faces a structural problem. Every dollar of dividend income pushes the denominator up without helping the numerator, making the one-third threshold progressively harder to reach.
The Unusual Grant Exclusion
A single large gift can wreck an otherwise healthy ratio, and the IRS provides a safety valve. If a contribution qualifies as an “unusual grant,” you can exclude it from both sides of the fraction.6Internal Revenue Service. Guidelines for Unusual Grants (Rev. Proc. 81-7)
To qualify, the grant has to clear several conditions. The donor cannot be someone who created the organization, previously gave a substantial portion of its funding, or holds a position of authority. The gift must be cash, readily marketable securities, or assets that directly further your exempt purpose. Your organization must already have an active charitable program and meaningful public support before receiving the grant. No material restrictions can attach to the gift, and if it funds operations, it cannot cover more than one year’s worth.
The exclusion only helps if you would still pass the support test without the grant. If stripping it out leaves you under one-third anyway, the safety valve is not the fix.
The Facts and Circumstances Backup
Organizations that fall short of one-third have a narrower path. The facts and circumstances test requires public support of at least 10 percent of total support, plus a showing that your structure and operations genuinely attract and depend on public funding.1Internal Revenue Service. Exempt Organizations Annual Reporting Requirements – Form 990, Schedules A and B: Public Charity Support Test The 10 percent floor is necessary but not sufficient.
The IRS weighs several factors, none controlling. It looks at whether you run a continuous, active fundraising program aimed at the general public or government sources. It considers how much of your board represents the broader public interest rather than a narrow donor group. It examines whether your facilities and programs are open and accessible to the community. And it weighs how far above 10 percent you actually sit: an organization at 12 percent faces more skepticism than one at 18 percent.7Internal Revenue Service. Instructions for Form 1023 The subjectivity is why most organizations plan to stay above the one-third line.
Choosing 170(b)(1)(A)(vi) or 509(a)(2)
Before you commit to this classification, make sure it fits your revenue mix. Section 170(b)(1)(A)(vi) focuses on contributions and government grants. Program service revenue (tuition, ticket sales, service fees) does not count as public support; it sits in the denominator, where it works against you. This classification suits organizations funded mainly by donations and grants.8Internal Revenue Service. Determine Your Foundation Classification
Section 509(a)(2) counts a broader mix. It includes gifts, grants, membership fees, and gross receipts from exempt-function activities in its one-third calculation, though receipts from any single payer are capped at the greater of $5,000 or 1 percent of total support for that year.2Office of the Law Revision Counsel. 26 U.S. Code 509 – Private Foundation Defined Section 509(a)(2) organizations must also keep gross investment income and unrelated business income below one-third of total support. If earned revenue drives your budget, 509(a)(2) is usually the better fit.
Electing the Classification on Form 1023
You claim 170(b)(1)(A)(vi) status when you apply for exempt status. Part VII of Form 1023 asks you to identify your foundation classification, and you choose the line for organizations receiving substantial support from grants and public contributions.7Internal Revenue Service. Instructions for Form 1023 The IRS user fee is $600 for Form 1023, or $275 for Form 1023-EZ if you qualify for the streamlined application.9Internal Revenue Service. Frequently Asked Questions About Form 1023
During your first five years, the IRS treats you as a public charity based on the representations in your application; you do not have to have passed the support test yet.10Internal Revenue Service. Advance Ruling Process Elimination – Public Support Test After year five, you have to demonstrate compliance with actual financial data. That grace period is time to build a diversified funding base. Organizations that use it as a five-year runway to a single major funder often find the fifth year unforgiving.
Proving Status Each Year on Schedule A
Once past startup, you demonstrate public charity status annually through Schedule A, filed as an attachment to Form 990.11Internal Revenue Service. Exempt Organization Annual Filing Requirements Overview Organizations classified under 170(b)(1)(A)(vi) complete Part II, which walks the five-year support calculation line by line.12Internal Revenue Service. Instructions for Schedule A (Form 990) (2025)
Each year the window slides. Drop the oldest year, add the newest. Apply the 2 percent cap to each individual, corporate, and trust donor across the full five-year period, aggregating every gift from the same source before applying the cap. Government grants and contributions from other 170(b)(1)(A)(vi) organizations go in at full value. Tracking every donor across a moving five-year window is a systematic exercise; organizations with large donor databases cannot leave it for filing week.
What Happens If You Fail the Test
One bad year does not immediately change your classification. An organization that passes the test for a given year keeps public charity status for that year and the following one, regardless of actual support in the following year.10Internal Revenue Service. Advance Ruling Process Elimination – Public Support Test That carry-forward gives you a one-year buffer to correct course.
Fail two years in a row and the IRS reclassifies you as a private foundation, effective at the beginning of the second failure year. You become subject to the 1.39 percent excise tax on net investment income and the restrictions on self-dealing, mandatory distributions, and business holdings.13Internal Revenue Service. Tax on Net Investment Income If you later try to shed private foundation status, you may face the termination tax under Section 507, which can equal the lesser of the organization’s net assets or the aggregate tax benefit from its entire history of exempt status.14Office of the Law Revision Counsel. 26 U.S. Code 507 – Termination of Private Foundation Status
The most effective protection is monitoring your Schedule A calculation during the year, not after the fiscal year closes. If your percentage is trending downward, the time to diversify sources is while you still have years of healthy ratios inside the five-year average. Once the numbers have already tipped, the arithmetic works against you for years.