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Private Foundation Rules: Five Restrictions and Form 990-PF

Private foundation rules: the five Chapter 42 restrictions under sections 4941 through 4945, and Form 4720
Compliance & ReportingNPO Resources Editorial TeamUpdated September 6, 2026Source-based guide
SourcesPublic information
FormatNeutral guide
Next stepVerify official pages

Important note: This guide is general planning information, not legal, tax, or accounting advice. It describes what the IRS forms and publications say and where each requirement sits; it does not tell you what your organization should do. Verify current requirements against the forms and instructions for your own tax year, and with a qualified professional.

Key takeaways

  • Every 501(c)(3) is classified as a private foundation under section 508 unless it meets one of the exceptions in section 509(a). The determination letter states which classification the IRS assigned.
  • Five restrictions apply: self-dealing, annual distribution, business holdings, jeopardizing investments, and expenditures. Part VI-B of Form 990-PF turns each one into a yes-or-no question, and a “Yes” points to Form 4720.
  • The excise tax on net investment income is 1.39% for tax years beginning after December 20, 2019. IRS Publication 4221-PF still prints the older 2% rate, because it was last revised in August 2014.
  • Form 990-PF has no small-foundation exemption and no e-Postcard. It is filed whether or not the foundation had income or activity during the year, and the 2025 return must be filed electronically.
  • Minimum investment return is 5% of the net value of noncharitable-use assets, printed on the 2025 Form 990-PF at Part IX line 6. Part X subtracts the investment income tax from it to reach the distributable amount, and failing to distribute that carries a 30% excise tax.

On this page

Every 501(c)(3) starts here

The letter arrives and it says private foundation, and nobody in the room is sure whether that is a description or a problem. Sometimes it lands on an organization that thinks of itself as a small grantmaking fund run by one family. Sometimes it lands on a group that expected to be called a public charity and cannot see where the other answer came from.

Private foundation is the default classification Under section 508 every organization recognized under section 501(c)(3) is classified as a private foundation. Public charity status applies only to an organization that meets one of the exceptions listed in section 509(a). The IRS exemption letter states which classification was assigned. The order the rule is written in Section 501(c)(3) Recognized as tax exempt. Classification comes next. Private foundation The default under section 508. No qualifying step required. Public charity Only by meeting a section 509(a) exception. Stated in the letter.

It came from the default. That is the part worth knowing before anything else, because the private foundation rules attach to the classification and not to the size of the organization.

Publication 4221-PF states it directly:

Under section 508, every organization is automatically classified as a private foundation unless it meets one of the exceptions listed in section 509(a).

Read that in the order it is written. Private foundation is not a category an organization is placed into after review. It is the category everyone begins in, and public charity status is the exception you have to qualify for. It works the way a default setting does. Nobody chose it, nothing triggered it, and it holds until someone qualifies out of it.

Which means the practical first question is not whether the organization feels like a foundation. It is what the determination letter says. Publication 4221-PF points at the same document:

The organization’s exemption letter will indicate whether the organization has been classified as a private foundation, a private operating foundation or an exempt operating foundation.

If the letter is not at hand, the classification also shows in the Form 1023 or 1023-EZ application that produced it, and in the return the organization has been filing since.

The private foundation rules, and where the form asks

The private foundation rules live in Chapter 42 of the Internal Revenue Code, and they are not one rule. Five of them are restrictions on conduct, and together they describe what the organization may not do with its money. Publication 4221-PF lists them in one place:

Form 990-PF Part VI-B items map to Chapter 42 sections and Form 4720 schedules Part VI-B of Form 990-PF, titled Statements Regarding Activities for Which Form 4720 May Be Required, asks eight numbered items, of which items 1 through 5 map to the Chapter 42 restrictions. Item 1 covers self-dealing under section 4941 and Form 4720 Schedule A. Item 2 covers failure to distribute income under section 4942 and Schedule B. Item 3 covers excess business holdings under section 4943 and Schedule C. Item 4 covers jeopardizing investments under section 4944 and Schedule D. Item 5 covers taxable expenditures under section 4945 and Schedule E. A Yes on any item points to Form 4720 unless an exception applies. Form 990-PF Part VI-B · items 1–5 ITEM WHAT IT ASKS ABOUT CODE FORM 4720 1 Self-dealing Section 4941 Schedule A 2 Failure to distribute Section 4942 Schedule B 3 Excess business holdings Section 4943 Schedule C 4 Jeopardizing investments Section 4944 Schedule D 5 Taxable expenditures Section 4945 Schedule E The part runs to item 8. Any item checked Yes points to Form 4720, unless an exception applies.

restrictions on self-dealing between private foundations and their disqualified persons (defined as substantial contributors, foundation managers, and certain other related persons); requirements that foundations annually distribute income for charitable purposes; limits on foundation holdings in private businesses; restrictions on investments that might jeopardize the carrying out of exempt purposes; and, provisions to ensure that expenditures further exempt purposes.

That list reads as abstract policy until you open the return. On the 2025 Form 990-PF the five become items 1 through 5 of Part VI-B, titled Statements Regarding Activities for Which Form 4720 May Be Required, under a single instruction:

File Form 4720 if any item is checked in the “Yes” column, unless an exception applies.

  • Item 1 — self-dealing, section 4941. Sales, leases, loans, goods and services, compensation, and transfers between the foundation and a disqualified person. Item 1b cites Regulations section 53.4941(d)-3 for the exceptions.
  • Item 2 — failure to distribute income, section 4942. The form names the section in the item’s own heading.
  • Item 3 — excess business holdings, section 4943. Item 3a asks whether the foundation held more than a 2% direct or indirect interest in any business enterprise at any time during the year, and 3b directs the reader to Form 4720 Schedule C.
  • Item 4 — jeopardizing investments, section 4944. Whether the foundation invested any amount in a manner that would jeopardize its charitable purposes.
  • Item 5 — taxable expenditures, section 4945. Item 5a(1) cites section 4945(e) for lobbying expenditures.

The excise taxes those questions lead to are not a single rate. The IRS publishes a page for each of the five sections, and each one states an initial tax and a second, much larger tax that lands if the problem is not corrected.

  • Section 4941, self-dealing. 10% of the amount involved on the disqualified person, 5% on a foundation manager who knowingly participates. An additional tax of 200% on the disqualified person if the act is not corrected.
  • Section 4942, failure to distribute. 30% of the undistributed income, charged for each year the deficiency stands. An additional 100% if the foundation does not make up the shortfall within 90 days of IRS notification.
  • Section 4943, excess business holdings. Holdings of the foundation and all its disqualified persons combined are limited to 20% of the voting stock of a corporation. 10% of the value of the excess on the foundation, and an additional 200% if the excess is not disposed of by the end of the taxable period.
  • Section 4944, jeopardizing investments. 10% of the amount involved on the foundation, and 10% on a manager who knowingly, willfully, and without reasonable cause participated. An additional 25% if the investment is not removed from jeopardy.
  • Section 4945, taxable expenditures. 20% of the amount expended on the foundation, 5% on a knowing manager up to $10,000 per expenditure. An additional 100% on the foundation if the expenditure is not corrected.

The pattern underneath is worth naming, because it changes how the numbers feel. The five above are tickets: each one appears only when something specific has gone wrong, and each escalates when it stays wrong. Section 4940 sits in the same chapter and works nothing like them. It is a meter: charged on investment income whether or not anything went wrong. The next section covers it.

The excise tax on net investment income

Section 4940 imposes a tax on most domestic private foundations, including private operating foundations, on their net investment income. It is reported on Form 990-PF and paid annually, and estimated tax rules apply.

The current rate is stated in the 2025 Instructions for Form 990-PF, in the guidance for Part V:

These foundations are subject to a 1.39% tax on net investment income under section 4940(a).

One flat rate, no reduction tier. That last part matters more than it looks, and the next section explains why.

The IRS’s own compliance guide is from 2014

Publication 4221-PF is called Compliance Guide for 501(c)(3) Private Foundations. It is written by the IRS, hosted on irs.gov, and titled for exactly the question a small foundation is asking. It is also, on two of the private foundation rules a small foundation would actually act on, out of date.

The last page of the file carries the revision line:

Publication 4221-PF (Rev. 8-2014) Catalog Number 49830S

The guide’s text on section 4940 reads:

Section 4940 of the Code imposes an excise tax of 2% on the net investment income of most domestic tax-exempt private foundations, including private operating foundations.

And a few lines later:

Further, some foundations are only required to pay a 1% tax.

Both of those describe the law as it stood before December 2019. The IRS page on the tax gives the change and the date it took effect:

For tax years beginning on or before Dec. 20, 2019, the excise tax is 2 percent of net investment income, but is reduced to 1 percent in certain cases. For tax years beginning after Dec. 20, 2019, the excise tax is 1.39% of net investment income, and there is no reduced 1 percent tax rate.

The same guide is also behind on electronic filing. It describes a threshold:

Private foundations and non-exempt charitable trusts that file Form 990-PF are required to file electronically, regardless of their asset size, if they file 250 returns a year (including income tax, employment and excise tax, and information returns such as Forms W-2s and 1099s). Other private foundations are given a choice to file Form 990-PF electronically.

The 2025 instructions have no threshold left to meet:

Required electronic filing. If you are filing a 2025 Form 990-PF, you are required to file electronically.

A timetable bolted to the pole at a bus stop is posted by the transit authority, printed on their letterhead, and entirely capable of describing a route that changed years ago. Authority and currency are two different properties of a document, and the same agency publishes both kinds. Neither of these is an error by the IRS — a publication revised in 2014 is simply a 2014 publication, and it says so on its own last page.

Form 990-PF: no threshold to fall under

Most of the annual return questions a small organization asks are threshold questions. Which form applies at what level of gross receipts, which one at what level of assets. Our team sees those questions carried straight over to private foundations, where they have no answer, because the thresholds do not exist.

Publication 4221-PF puts the requirement plainly. A private foundation is:

required to file Form 990-PF, Return of Private Foundation, annually whether or not they have any taxable income for, or activity during, the year.

No gross receipts test, no asset test, no e-Postcard at any size. A foundation with no activity for the year still files. If the question you are working on is which of the 990-series returns applies to a public charity, that belongs with the Form 990 filing requirements and thresholds, not here.

The deadline follows the same rule as the rest of the series. From the 2025 instructions:

This return must be filed by the 15th day of the 5th month following the close of the foundation’s tax year.

Publication 4221-PF states the calendar-year version of the same date — May 15 — and that date fits on the same annual compliance calendar as everything else the organization files. The compliance resource finder lists the federal and state filings that share that calendar.

Two percentages on Part IX are worth locating before the accountant asks. Part IX line 3 is the fair market value of the assets not used directly for charitable purposes, less acquisition indebtedness. Line 4 sets aside cash deemed held for charitable activities at 1.5% of that, and line 6 reads:

Minimum investment return. Enter 5% (0.05) of line 5

That 5% is not a summary of anything. It is the figure the form itself tells you to enter. It is not the payout obligation, though — Part X starts from it, subtracts the tax on investment income, and the result is the distributable amount. That is what section 4942 measures against.

Private operating foundations

Not every private foundation is a grantmaker. Publication 4221-PF draws the line by where the resources go:

A private operating foundation is a private foundation that devotes most of its resources to the active conduct of its exempt activities as distinguished from the more common grant-making foundation that generally makes grants to other organizations for exempt purposes.

The guide gives a museum supported by a limited number of individuals as an example, and adds a caution worth repeating:

Private operating foundations and exempt operating foundations are relatively uncommon.

Qualifying is not a matter of describing the work that way. An organization must meet an assets test, a support test, or an endowment test, and show that it distributes substantially all — 85% or more — of the lesser of its adjusted net income or its minimum investment return directly for the active conduct of its exempt activities. Part XIII of Form 990-PF is where that is worked out.

The classification carries real consequences in both directions. Most Chapter 42 restrictions still apply. The section 4942 distribution question in Part VI-B does not apply for years the foundation was an operating foundation under section 4942(j)(3) or (j)(5). And the limit on what a donor may deduct differs by classification — a figure that has moved more than once through temporary legislation, so check the current IRS page for the year in question rather than a stored number.

What becomes public

A private foundation’s return is a public document, and more of it is public than many boards expect. The 2025 instructions state the obligation:

A private foundation must make its annual returns and exemption application available for public inspection.

The instructions extend that to the specific documents:

The foundation’s Form 990-PF, Form 990-T, and exemption application must be made available to the public by the foundation and the IRS.

Schedule B is part of the return. Publication 4221-PF sets out when it is required:

If the private foundation receives money, securities, or other property valued at $5,000 or more directly or indirectly from any person during the year, it must complete Schedule B, Schedule of Contributors and attach it to Form 990-PF.

There is a related absence worth noticing. Search the 2025 Form 990-PF and its instructions for conflict of interest, whistleblower, or document retention and the count is zero in both files. Form 990-PF has a Part VI-A and VI-B, but they are Statements Regarding Activities, not the governance questions that share a part number on the full Form 990. A private foundation is not asked whether it has a written conflict of interest policy. It is asked, in Part VI-B item 1, whether it engaged in the transactions such a policy exists to prevent — and a “Yes” is taxed rather than noted.

Reading an IRS source’s revision line

The habit that would have caught both of the stale figures above takes about ten seconds, and it works on every IRS document.

  • Find the revision line before reading the content. On a publication it is on the last page, printed as Rev. followed by a month and year, with a catalog number beside it. On a form or its instructions it is the tax year printed in the header.
  • Prefer the form and its instructions over a guide. Forms are reissued every tax year. Guides are revised when someone revises them.
  • Cross-check any rate or threshold against two current documents. The topic page on irs.gov and the current year’s instructions should agree. When a guide disagrees with both, the guide is the odd one out.
  • Write down the date you checked. A number verified in September 2026 is a number verified in September 2026, not a permanent fact.

A small foundation does not need to run this on every page it reads about the private foundation rules. Run it on the numbers that carry money — a rate, a threshold, a filing requirement — and let the rest be background.

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Frequently asked questions

Under section 508 every 501(c)(3) is classified as a private foundation unless it meets one of the exceptions in section 509(a), so the default answer is yes until something else applies. The organization’s IRS exemption letter states the classification it was given, including whether it is a private foundation, a private operating foundation, or an exempt operating foundation.

For tax years beginning after December 20, 2019 the rate under section 4940(a) is 1.39%, and there is no reduced 1 percent rate. The 2025 Instructions for Form 990-PF state the 1.39% figure in the guidance for Part V. IRS Publication 4221-PF still prints the earlier 2% rate because it was last revised in August 2014.

Yes. Form 990-PF is filed annually whether or not the foundation had any taxable income for, or activity during, the year, and there is no e-Postcard option at any size. The return is due by the 15th day of the 5th month after the close of the foundation’s tax year, which is May 15 for a calendar-year foundation, and the 2025 return must be filed electronically.

Part IX of Form 990-PF calculates minimum investment return as 5% of the net value of the foundation’s noncharitable-use assets. That figure is not itself the payout obligation. Part X subtracts the tax on investment income from it to reach the distributable amount, and the distributable amount is what the foundation is expected to pay out in qualifying distributions. A foundation that does not distribute the distributable amount in time is subject to a 30% excise tax on the undistributed income under section 4942, with an additional 100% tax if the shortfall is not made up within 90 days of IRS notification.

Part VI-B of Form 990-PF instructs the filer to file Form 4720 if any item in that part is checked in the “Yes” column, unless an exception applies. Items 1 through 5 cover the Chapter 42 restrictions: self-dealing under section 4941, failure to distribute income under section 4942, excess business holdings under section 4943, jeopardizing investments under section 4944, and taxable expenditures under section 4945. The remaining items in that part ask about other matters, including personal benefit contracts and prohibited tax shelter transactions.

Sources reviewed

Every source below was opened and checked on 2026‑09‑04. IRS forms are revised each tax year and publications are revised only when they are revised; the date is part of the citation.

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