W-8BEN-E Private Foundation: Certify Line 4 and Choose Part XXI or XXII

You are here because a U.S. private foundation, donor-advised fund sponsor, university, or enterprise compliance team asked your family foundation or corporate charity for IRS Form W-8BEN-E, and Part I, Line 4 lists Private foundation right beside Tax-exempt organization. That narrower box is not interchangeable with the public-charity label—it tells the withholding agent that your organization is funded chiefly by one family, individual, or corporation rather than by broad public support.

Foreign private foundations often receive U.S.-source grants, program-related investments, licensing royalties, or contracted research fees. Without a valid certificate, payers may withhold 30% under default rules or delay disbursements while legal teams ask for a corrected Line 4 or Line 5 answer. The workflow is two-layered: first you certify Private foundation on Line 4 (Chapter 3), then you select the nonprofit subtype on Line 5 (Chapter 4)—typically 501(c) organization with an IRS determination letter (Part XXI) or Nonprofit organization for a recognized foreign charity (Part XXII).

This guide explains what Private foundation status means on W-8BEN-E, who should select it, how U.S. withholding applies to foundation income, how it differs from Tax-exempt organization, and when Part III treaty benefits may still matter. Outcomes depend on your governing documents, funding sources, and payment type—this page explains mechanics, not individualized tax advice.

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What is Private Foundation status on Form W-8BEN-E?

Private foundation appears on Part I, Line 4 as a Chapter 3 status (entity type) on Form W-8BEN-E. The IRS uses Chapter 3 classifications to apply U.S. withholding rules to foreign entities. Selecting Private foundation tells the withholding agent that the entity is a charitable organization whose support comes primarily from a limited number of sources—a family, an individual, or a corporation—rather than from the general public.

• Limited funding sources: Most contributions come from one donor family, a founder, or a related company; the organization does not rely on broad public fundraising.
• Still a nonprofit for Chapter 3: Private foundations pursue charitable purposes, but the Line 4 label is more specific than Tax-exempt organization for public charities and membership associations.
• Separate from FATCA (Line 5): Private foundation is Chapter 3. Your Chapter 4 subtype—501(c) organization or Nonprofit organization—is chosen separately on Line 5 and drives Part XXI or Part XXII.
• Not for operating companies: A foundation that runs a taxable trade or business may still file W-8BEN-E, but unrelated business income can affect withholding and treaty claims—facts matter.

Think of Private foundation as the precise Chapter 3 box when your statute or charter describes a family endowment, corporate giving vehicle, or single-donor charity without wide public support. Line 4 alone does not complete the certificate—you must align Line 5 with Part XXI or Part XXII per IRS instructions. Official guidance is on the IRS W-8BEN-E page. For how Line 4 fits the whole form, see our Chapter 3 status guide and complete W-8BEN-E guide for businesses.

Who should check Private foundation on Line 4?

Only organizations that are nonprofits under local law and meet the private-foundation concept for Chapter 3 should use this box. Typical situations include:

• Family foundations or endowments funded primarily by one family without broad public fundraising.
• Corporate foundations established and funded by a single company for charitable grants and programs.
• Founder-led charities where one individual or trust supplies most annual support.
• Foreign equivalents of U.S. private foundations receiving U.S. grants, donations, or royalties.
• Compliance teams renewing a certificate after counsel confirms the entity is not a public charity for Line 4 purposes.

How Private Foundation status affects U.S. withholding

U.S. payers generally withhold 30% on certain U.S.-source payments to foreign persons unless a valid Form W-8 certificate supports a lower rate or exemption. For entities, W-8BEN-E is that certificate. Checking Private foundation on Line 4 does not by itself eliminate withholding—it identifies entity type so the payer knows which follow-up certifications and treaty claims are available.

Many grants to qualifying charities may be exempt from withholding when properly documented, but fees for services, royalties, or unrelated business income can still be subject to tax unless Part III treaty benefits apply. If no valid form is on file, payers may withhold at 30% or block payments. For complex structures or large amounts, consult a qualified tax adviser.

Private foundation vs tax-exempt organization vs 501(c)

Line 4 offers several nonprofit-related Chapter 3 boxes. Pick the most specific label that matches your funding structure—not the one that sounds simplest.

• Private foundation (this guide): For charities funded chiefly by one family, individual, or corporation without broad public support. Line 5 then points to Part XXI or Part XXII.
• Tax-exempt organization: Broader Chapter 3 box for public charities, schools, and similar NPOs with wider funding. See Tax-exempt organization guide.
• 501(c) organization (Line 5, not Line 4): Chapter 4 subtype when the IRS issued a 501(c) determination letter—requires Part XXI after you select Private foundation on Line 4.

Chapter 4: Part XXI vs Part XXII after Private foundation

After you check Private foundation on Line 4, Part I, Line 5 asks for your Chapter 4 (FATCA) nonprofit subtype. That choice determines which certification section you complete—this is where many family foundations stall because the options sound similar.

The two paths below cover most foreign private foundations. Your determination letter or home-country exemption documents should drive the final box—not convenience.

• 501(c) organization → Part XXI: Use when the foundation has an official IRS determination letter that it meets section 501(c) of the U.S. Internal Revenue Code. You certify U.S. tax-exempt status under Part XXI.
• Nonprofit organization → Part XXII: Use when the entity is a recognized charity in its country of establishment but does not have an IRS 501(c) determination letter. Part XXII certifies charitable purposes, home-country exemption, and that assets are not distributed to private individuals for private benefit.

Step-by-step: certifying Private Foundation on W-8BEN-E

Use this sequence before signature. Line numbers follow the current IRS form; confirm against the PDF you sign.

1. Step 1 — Confirm nonprofit status and funding model: Gather statute, registration, or counsel memo. Private foundation on Line 4 must reflect that support comes chiefly from limited sources, not broad public fundraising.
2. Step 2 — Choose the most specific Line 4 box: If the entity is a public charity under U.S. concepts, use Tax-exempt organization instead. If it is a for-profit affiliate, that entity files separately.
3. Step 3 — Check Private foundation only when appropriate: Select one Chapter 3 box. Do not also mark Tax-exempt organization because the foundation makes public grants—that describes operations, not funding sources.
4. Step 4 — Select Line 5 subtype (501(c) vs Nonprofit organization): Match Part XXI or Part XXII to whether you hold an IRS determination letter. Payers often request a copy of the letter or home-country exemption proof.
5. Step 5 — Complete Part III only if claiming treaty benefits: When royalties or service fees need a reduced rate, complete Part III with the correct treaty article and Line 14b category. Treaty rates can change—verify against current IRS treaty tables before filing.
6. Step 6 — Sign and send to the withholding agent: Submit the signed PDF to the U.S. payer or platform—not to the IRS. Renew when status changes or the certificate expires under form instructions.

Part XXI: foundation with IRS 501(c) determination

When Line 5 selects 501(c) organization, you complete Part XXI. This path applies only if the IRS issued a determination letter that the entity qualifies under section 501(c)—for example, a U.S. private foundation or a foreign organization that obtained U.S. exempt status. Do not use Part XXI based on a foreign charity registration alone.

Part XXII: foreign private foundation without IRS 501(c) letter

When Line 5 selects Nonprofit organization, you complete Part XXII. You certify that the organization was established exclusively for religious, charitable, scientific, artistic, cultural, or educational purposes, is exempt from income tax in its country, and does not distribute earnings or assets to private persons for private benefit. Keep home-country registration and exemption documents ready—the payer may request them.

Part III: treaty benefits for private foundations

Even private foundations may complete Part III when claiming reduced withholding under an income tax treaty. Line 14b includes categories such as Other tax-exempt organization when instructions are met. Match the treaty article to how the payer classifies the payment (grant vs royalty vs service fee). This page explains mechanics; your final rate depends on facts and limitation-on-benefits rules.

What if you do not submit a valid W-8BEN-E?

Without a valid certificate, U.S. payers often apply the default 30% withholding rate on reportable payments or refuse to release funds until compliance is satisfied. For private foundations, that can delay grant disbursements, sponsored research payments, or platform payouts. Submitting an incorrect Line 4 or Line 5 box can be worse than delay—payers may request a corrected form under penalties of perjury.

Worked example: a UK family foundation receiving a US research grant

The Whitfield Family Foundation, a charitable incorporated organisation (CIO) registered with the Charity Commission for England and Wales and funded almost entirely by the Whitfield family, receives a research grant from a US university. Before its W-8BEN-E was on file, the university's payments office withheld the default 30% on the payment as US-source income to a foreign organisation.

The foundation certifies Form W-8BEN-E, checking Private foundation on Line 4 (its funding comes chiefly from one family, not broad public support) and Nonprofit organization on Line 5—Part XXII—because it holds no IRS 501(c) determination letter. In Part XXII it certifies its charitable purpose, UK tax-exempt status, and that no assets are distributed for private benefit. The university now releases the grant without withholding.

• Without W-8BEN-E: 30% withheld on the US research grant.
• With W-8BEN-E, Line 4 = Private foundation, Line 5 = Nonprofit organization, Part XXII completed: 0% withholding on the qualifying grant—full amount reaches the foundation.

Where to go next

Private foundation is a U.S. tax classification—it does not change by your country of residence. If you need adjacent Line 4 boxes, public-charity guidance, or a full form walkthrough, use these guides:

• W-8BEN-E for tax-exempt organizations and public charities
• Chapter 3 status overview on W-8BEN-E
• International organization on W-8BEN-E
• Complete W-8BEN-E guide for businesses

Common Private Foundation mistakes on W-8BEN-E

• Using Tax-exempt organization for a family-funded foundation: When support comes chiefly from one source, Private foundation is the more precise Line 4 box. The broader label can confuse payers reviewing FATCA certifications.
• Selecting 501(c) organization without an IRS determination letter: Part XXI requires a valid IRS letter. Foreign private foundations without one should use Nonprofit organization and Part XXII.
• Skipping Line 5 after Line 4: Chapter 3 and Chapter 4 are separate. An empty or inconsistent Line 5 answer is a frequent reason payers reject certificates.
• Assuming private foundation status means 0% on all U.S. income: Grants may be treated differently from service fees or royalties. Part III may still be required. Outcomes depend on facts and income type.
• Checking Corporation because the foundation invests in stocks: Investment activity does not make a charity a corporation for Chapter 3. The foundation remains a nonprofit entity type on Line 4.
• Submitting Form W-8BEN instead of W-8BEN-E: Organizations are entities for this purpose. Individual founders use Form W-8BEN, not the entity certificate.

What this means for your Charity Commission filings in the UK

Form W-8BEN-E and Part XXII only address US withholding—they do not replace your annual return and accounts filed with the Charity Commission for England and Wales, or your charity's UK tax position with HMRC. Keep the certificate consistent with the purposes and funding structure described in your governing document.

Most UK family and corporate foundations do not hold a US IRS 501(c) determination letter, so Part XXII—not Part XXI—is the realistic path. Keep your Charity Commission registration number and a copy of your governing document on hand, since US payers or their compliance teams sometimes request them to support the certification.

• Keep the Charity Commission registration number and governing document available for the US payer's records.
• Continue filing the normal annual return and accounts with the Charity Commission, independent of the W-8BEN-E.
• Confirm with counsel whether the foundation ever obtained a US 501(c) letter before choosing Part XXI over Part XXII.

Frequently asked questions about Private Foundation status

Private foundation on Line 4 is the Chapter 3 label for foreign charities funded chiefly by limited sources. After selecting it, choose the correct Line 5 subtype, complete Part XXI or Part XXII, and use Part III only when a valid treaty claim applies. When the entity is a public charity or for-profit affiliate, use the more specific Chapter 3 path instead.