IRS Form 990-PF is the annual federal tax return every private foundation must file, regardless of size or activity, to report its income, expenses, grants, officers, and investment holdings and to calculate the 1.39 percent excise tax it owes on net investment income.1Internal Revenue Service. About Form 990-PF, Return of Private Foundation or Section 4947(a)(1) Trust Treated as a Private Foundation It is filed electronically, it is a public document, and missing it carries penalties that begin accruing on day one.
Who Has to File
Three categories of organizations file the 990-PF. The most common is a domestic or foreign organization exempt under Section 501(c)(3) that is classified as a private foundation rather than a public charity.2Internal Revenue Service. Instructions for Form 990-PF (2025) – General Instructions The second is a taxable private foundation that has not obtained or has lost its exemption. The third is a nonexempt charitable trust under Section 4947(a)(1) whose interests are all devoted to charitable purposes; for those trusts, the 990-PF also substitutes for Form 1041 when the trust has no taxable income.1Internal Revenue Service. About Form 990-PF, Return of Private Foundation or Section 4947(a)(1) Trust Treated as a Private Foundation
Size does not create a shortcut. Private foundations cannot use Form 990-EZ or the Form 990-N electronic postcard that small public charities file.3Internal Revenue Service. Form 990 Series Which Forms Do Exempt Organizations File Filing Phase In A foundation that made no grants and earned no income during the year still owes the full 990-PF. Skipping it puts tax-exempt status at risk.
What the Form Reports
The 990-PF collects a detailed picture of everything a foundation owns, earns, spends, and gives away. It starts with the basics: legal name, any alternate names, and the nine-digit Employer Identification Number.4Internal Revenue Service. 2025 Instructions for Form 990-PF From there, the reporting breaks into a few areas.
The balance sheet asks for the fair market value of all assets at the end of the accounting period, covering investment portfolios, real estate, and cash. Revenue must be broken down by source: interest, dividends, rents, capital gains, and other income. Expenses cover administrative costs, compensation paid to officers and employees, and professional fees. Every grant paid during the year gets its own line showing the recipient’s name, the dollar amount, and the purpose of the funding.
The form also includes a series of yes-or-no compliance questions that function as red flags for the IRS. They cover whether the foundation engaged in self-dealing, whether it holds excess business interests, whether it made political expenditures, and whether it had authority over foreign financial accounts worth more than $10,000.5Internal Revenue Service. Instructions for Form 990-PF (2025) – Part VI-B Statements Regarding Activities for Which Form 4720 May Be Required Certain “yes” answers require the foundation to also file Form 4720 and pay additional excise taxes.
The 1.39 Percent Excise Tax on Investment Income
Private foundations pay an annual excise tax of 1.39 percent on their net investment income, and the 990-PF is where that tax is calculated and reported.6Office of the Law Revision Counsel. 26 USC 4940 Excise Tax Based on Investment Income Net investment income includes interest, dividends, rents, royalties, and net capital gains from selling assets. This flat rate replaced an older two-tier system that charged either 1 or 2 percent depending on giving history, and it took effect for tax years beginning after December 20, 2019.
Capital gains need extra care because foundation cost-basis rules differ from the ones individuals use. For property received as a gift after 1969, the basis is whatever the donor’s basis was at the time of the gift.7Internal Revenue Service. Tax on Net Investment Income Capital Gains and Losses Getting the basis wrong inflates or understates the excise tax owed.
The Five Percent Payout Requirement
Congress did not create private foundations so that money could sit indefinitely in a tax-advantaged vehicle. The payout rule forces a foundation to spend roughly five percent of its non-charitable-use assets, meaning investments, cash, and similar holdings, on charitable activities each year. The form calculates this “distributable amount” from the average monthly fair market value of those assets over the preceding year.
The word “roughly” matters. The actual required payout is slightly less than five percent once adjustments built into the formula (such as excise tax already paid) are applied. Most foundations aim for the full five percent to leave a margin. Qualifying distributions include grants to public charities, direct charitable activities the foundation runs itself, and certain administrative costs tied to charitable programs.
Falling short is expensive. The IRS imposes an initial excise tax of 30 percent on the undistributed amount. If the foundation still does not correct the shortfall within the taxable period, the follow-up penalty is 100 percent of what remains undistributed. Chronic underspending compounds fast.
Other Excise Taxes the Form Surfaces
The tax on investment income is only one of several taxes a private foundation can owe. The 990-PF’s compliance questions are designed to flag four other categories of prohibited conduct.
Self-Dealing
A private foundation cannot enter into financial transactions with “disqualified persons,” a category that includes substantial contributors, foundation managers, and their family members. Prohibited transactions cover sales or leases of property between the foundation and an insider, loans in either direction, excessive compensation, and letting insiders use foundation assets.8Office of the Law Revision Counsel. 26 US Code 4941 – Taxes on Self-Dealing The initial tax is 10 percent of the amount involved for each year the self-dealing goes uncorrected. A foundation manager who knowingly participated owes a separate 5 percent tax. If the transaction still is not undone, the self-dealer faces a 200 percent additional tax.
Excess Business Holdings
A private foundation and its disqualified persons together generally cannot own more than 20 percent of the voting stock in any business enterprise.9Office of the Law Revision Counsel. 26 USC 4943 Taxes on Excess Business Holdings That limit rises to 35 percent if unrelated parties maintain effective control. A foundation that holds no more than 2 percent of a company’s voting stock and 2 percent of the total value of all shares is automatically safe regardless of what disqualified persons own. When excess holdings arrive through a gift or bequest, the foundation gets five years to divest, and the IRS can grant another five years for unusually large or complex gifts.10Internal Revenue Service. IRC Section 4943(c)(7) Extension of Period to Dispose of Certain Assets Holding past the deadline triggers a 10 percent excise tax on the value of the excess.
Jeopardizing Investments
A foundation cannot invest in ways that put its charitable mission at risk. There is no IRS blacklist; the test is whether an investment was made without reasonable business care and prudence. The initial tax is 10 percent of the amount invested for each year the investment stays in place, with a matching 10 percent tax on managers who knowingly approved it.11Office of the Law Revision Counsel. 26 US Code 4944 – Taxes on Investments Which Jeopardize Charitable Purpose If the investment stays in jeopardy, an additional 25 percent tax applies.
Taxable Expenditures
Certain spending is flatly off-limits: lobbying, attempting to influence elections, grants to individuals without IRS-approved selection procedures, and grants to organizations that are not public charities unless the foundation exercises expenditure responsibility.12Office of the Law Revision Counsel. 26 USC 4945 Taxes on Taxable Expenditures The initial tax is 20 percent of the amount spent, with a separate 5 percent tax on any manager who knowingly approved it.
The Return Is Public
Unlike an individual’s tax return, the 990-PF is a public document. Federal law requires every foundation to make its three most recent annual returns available for in-person inspection at its principal office during normal business hours.13Internal Revenue Service. Public Disclosure and Availability of Exempt Organization Returns and Applications Public Disclosure Overview Anyone can also pull returns through the IRS Tax Exempt Organization Search tool or third-party databases like Candid (formerly GuideStar).
One point catches many foundation managers off guard: private foundations must publicly disclose the names and addresses of their contributors. Public charities can redact donor information, but that exemption does not apply here.14Internal Revenue Service. Public Disclosure and Availability of Exempt Organizations Returns and Applications Contributors Identities Not Subject to Disclosure Schedule B, listing substantial contributors, is part of the public record for any private foundation.
Deadlines and Electronic Filing
Every private foundation must file electronically. The Taxpayer First Act eliminated paper 990-PF filing for tax years beginning after July 1, 2019.15Internal Revenue Service. E-File for Charities and Nonprofits The return is due on the 15th day of the fifth month after the foundation’s fiscal year ends. For calendar-year foundations, that means May 15.16Internal Revenue Service. Instructions for Form 990-PF (2025) – When and How to File
If more time is needed, filing Form 8868 before the deadline grants an automatic six-month extension, pushing the due date to November 15 for calendar-year filers. Form 8868 itself does not have to be filed electronically. Any excise tax owed must still be paid by the original due date to avoid interest, even with the return extended.
Penalties for Late or Incomplete Filing
Penalties escalate quickly. For returns required to be filed in 2026, a foundation that misses the deadline without reasonable cause owes $25 per day the return is late, up to a maximum of $13,000 or 5 percent of gross receipts, whichever is less.17Internal Revenue Service. Rev. Proc. 2024-40 The same penalty applies to a return that is filed on time but missing required information. For larger foundations with gross receipts above $1,309,500, the daily penalty rises to $130 and the maximum rises to $65,000.18Internal Revenue Service. 2025 Instructions for Form 990-PF – Section M Penalty for Failure to File Timely Completely or Correctly
Foundation managers can face personal liability too. If the organization fails to file without reasonable cause, any person responsible for filing who does not do so can be charged $10 per day up to $5,000.
The harshest consequence is automatic revocation. A foundation that fails to file for three consecutive years automatically loses its tax-exempt status by operation of law. Revocation is not discretionary, and the IRS publishes a list of revoked organizations. Reinstatement requires filing all back returns and submitting a new application for exemption, a process that can take months and cost thousands of dollars in professional fees.