Form 990-PF Filing: Private Foundation Guide

Private foundations face a regulatory framework that differs materially from public charities — and the annual return, Form 990-PF, is the mechanism through which the IRS monitors compliance with all of it. The 5% minimum distribution requirement, the investment income excise tax, the self-dealing prohibitions, and the public disclosure of Schedule B all flow through the 990-PF.

Understanding how to prepare an accurate 990-PF requires working through each section methodically. The penalties for errors are significant: excise taxes under Chapter 42 compound quickly, and foundation managers can face personal liability.

Who Files Form 990-PF

Every private foundation — whether or not it has income or assets — must file Form 990-PF annually. This includes:

• Domestic private foundations exempt under IRC Section 501(c)(3)
• Nonexempt charitable trusts treated as private foundations under Section 4947(a)(1)
• Foreign private foundations with US-source income or US activities
• Private operating foundations (different distribution rules apply)

Unlike public charities, there is no minimum-activity threshold that excuses a private foundation from filing.

The 5% Minimum Distribution Requirement

The heart of private foundation compliance is the mandatory minimum distribution. Under IRC Section 4942, a foundation must distribute a “distributable amount” each year, or face a 30% excise tax on the shortfall — and a 100% corrective tax if undistributed income is not distributed in the following year.

How the distributable amount is calculated:

1. Determine the average fair market value of non-charitable-use investment assets for the year
2. Multiply by 5%
3. Add undistributed income from prior years
4. Subtract Section 4940 excise taxes paid during the year

The denominator — the average FMV — is where most errors occur. Organizations that use only the year-end balance understate the distributable amount when assets grow during the year. The regulations require averaging across the year; monthly valuations averaged together is a common and defensible method.

What counts as a qualifying distribution:

Distributions to disqualified persons — even for charitable purposes — do not qualify without specific IRS approval.

Net Investment Income Excise Tax (Section 4940)

Prior to 2020, private foundations faced a complex two-tier excise tax: 2% of net investment income, reduced to 1% if the foundation increased qualifying distributions above a historical baseline. The Taxpayer Certainty and Disaster Tax Relief Act of 2020 simplified this to a flat 1.39%.

Net investment income includes:

• Dividends, interest, annuities
• Rents from real property (not excluded as for public charities)
• Royalties
• Net capital gains from disposal of investment assets

Allowable deductions against NII:

• Ordinary and necessary expenses paid to produce investment income
• Depreciation on property producing investment income (straight-line method required under regulations)

The 1.39% tax applies to NII, not gross investment income. State income taxes on investment income are a deductible expense, reducing NII.

Schedule B: Public Disclosure of Contributors

One of the most significant differences between private foundation and public charity reporting is Schedule B disclosure. For private foundations:

• Schedule B is filed with 990-PF
• Schedule B is a public document — anyone can request it
• Foundations must list all contributors of $5,000 or more, or 2% of total contributions (whichever is greater), with names and addresses

Public charities file Schedule B but their donor names are redacted from public copies. Private foundations have no such protection. This is a material consideration for foundations that receive large anonymous gifts or prefer donor confidentiality.

Self-Dealing Rules (Section 4941)

Transactions between a private foundation and its disqualified persons — officers, directors, substantial contributors, family members, and related entities — are prohibited under IRC Section 4941, regardless of whether the transaction benefits the foundation.

Prohibited transactions include:

• Sale or exchange of property
• Leases (including leases at market rent)
• Loans or extensions of credit
• Provision of goods, services, or facilities for less than adequate compensation
• Compensation arrangements (except reasonable compensation for personal services)

Excise tax consequences:

• First tier: 10% of the transaction amount against the disqualified person; 5% against participating foundation manager; assessed for each year the violation continues uncorrected
• Second tier (if not corrected): 200% of the transaction amount against the disqualified person; 50% against foundation managers up to $20,000

Reasonable compensation for services actually rendered to the foundation is exempt. Board members who receive no compensation have a specific exception for travel reimbursement.

How GrantPipe Helps

GrantPipe’s grant management and reporting infrastructure handles the grant-tracking side of 990-PF preparation — documenting qualifying distributions to grantees, capturing expenditure responsibility documentation for international grants, and maintaining the audit trail that supports Schedule B and the distributions schedule. The activity log provides timestamped records of every grant decision, payment, and correspondence that auditors or IRS examiners request first.

DEFINITION

Distributable amount

The minimum amount a private foundation must distribute each year, calculated as 5% of the average fair market value of non-charitable-use assets, plus any undistributed income from prior years, minus Section 4940 excise taxes paid.

DEFINITION

Qualifying distribution

Amounts paid to accomplish charitable purposes: grants to public charities, administrative expenses necessary to manage the foundation's charitable activities, program-related investments, and approved set-asides.

DEFINITION

Net investment income (NII)

Gross investment income (dividends, interest, rents, royalties, net capital gains) minus allowable deductions directly connected to producing that income. Subject to the 1.39% Section 4940 excise tax.

DEFINITION

Disqualified person

Under IRC Section 4946: substantial contributors, foundation managers, officers, directors, family members of the above, and entities in which disqualified persons hold more than 35% interest. Self-dealing transactions with disqualified persons incur excise taxes.

DEFINITION

Set-aside

Amounts set aside for specific charitable projects that the IRS has pre-approved as qualifying distributions, even though the funds have not yet been paid out.