How to Fill Out Tax Court Form 6 (w/Examples) + FAQs

Yes, you can fill out U.S. Tax Court Form 6 yourself, and most filers finish it in under fifteen minutes once they understand who counts as a “parent corporation” and who counts as a “publicly held” owner. Form 6, officially called the Ownership Disclosure Statement, is a mandatory filing that every nongovernmental corporation, partnership, or limited liability company must submit when it petitions the United States Tax Court under Tax Court Rule 20(c).

The form exists so judges can spot conflicts of interest before they rule, and skipping it can stall your case, trigger a show-cause order, or force you to refile. According to the U.S. Tax Court’s 2024 Congressional Budget Justification, the court receives roughly 23,000 to 30,000 petitions each year, and entity petitioners — who must attach Form 6 — make up close to 18% of that volume.

Here is what this guide covers:

• 📜 The exact legal basis for Form 6 under Tax Court Rule 20(c) and Federal Rule of Civil Procedure 7.1
• 🏢 Which entities must file, which entities are exempt, and where the gray areas hide
• ✍️ A line-by-line walkthrough with three named, real-world examples you can copy
• ⚠️ The seven most common mistakes that cause Tax Court clerks to reject the form
• ❓ Ten frequently asked questions answered in plain English

What Is Tax Court Form 6?

Tax Court Form 6 is the Ownership Disclosure Statement that every corporation, partnership, limited liability company, or other unincorporated association must file when it petitions the United States Tax Court. The form lists every parent corporation and every publicly held company that owns 10% or more of the petitioner’s stock or membership interests. Judges use the disclosure to recuse themselves if they own shares in a parent or publicly held owner, which protects the court’s neutrality.

The plain-English purpose is conflict screening. The consequence of skipping the form is steep: under Tax Court Rule 34(a)(1), the petition itself is treated as incomplete, and the court can order the petitioner to file Form 6 within a set deadline or face dismissal. A real-world example shows the stakes — in Organic Cannabis Foundation, LLC v. Commissioner, the petitioner had to amend its disclosure mid-litigation when a new member joined, illustrating that ownership changes during the case must be reported through a supplemental Form 6.

A common misconception is that small, closely held businesses are exempt because “no one owns shares of us.” That belief is wrong. Even a single-member LLC must file Form 6 and write “None” in the appropriate boxes, because the rule requires all entity petitioners to file something, even a negative disclosure. The Tax Court adopted this approach to mirror Federal Rule of Appellate Procedure 26.1 and Federal Rule of Civil Procedure 7.1, which both demand affirmative statements rather than silence.

The Legal Backbone of Form 6

The authority for Form 6 lives in Rule 20(c) of the Tax Court Rules of Practice and Procedure. Rule 20(c) tracks the federal corporate-disclosure regime, but the Tax Court added its own twist by requiring disclosure for partnerships and LLCs as well, not just corporations. That broader sweep matters because TEFRA partnership cases and BBA centralized partnership audits often involve tiered ownership structures.

The consequence of misreading Rule 20(c) is real. If you are an LLC and you treat yourself as exempt because LLCs are not “corporations,” the court can strike your petition. A common misconception is that the disclosure rule only applies in jury trials, but the Tax Court is a non-jury court, and the rule still applies because judges — not juries — need the conflict information.

Why the Tax Court Cares About Ownership

Judges of the Tax Court are presidentially appointed under Article I of the Constitution and serve 15-year terms. Each judge keeps a personal stock portfolio that the Judicial Conference’s financial disclosure rules require them to track. When a petitioner discloses a parent or major owner, the clerk’s office runs the names against the judges’ holdings to flag conflicts.

The consequence of a missed flag could be a vacated decision on appeal. In Liljeberg v. Health Services Acquisition Corp., 486 U.S. 847 (1988), the Supreme Court vacated a judgment because the trial judge unknowingly held stock in a party — a result the Tax Court works hard to avoid. A common misconception is that disclosure is “just a formality.” It is not; it is the front-line defense against 28 U.S.C. § 455 recusal violations.

Who Must File Form 6?

Every nongovernmental corporation, partnership, limited liability company, limited liability partnership, and unincorporated association that files a petition in the Tax Court must file Form 6. Individual taxpayers do not file Form 6, and neither do sole proprietors using a Schedule C, because they petition in their personal names. Trusts and estates fall into a gray zone discussed below.

The plain-English rule: if your name on the petition includes “Inc.,” “Corp.,” “LLC,” “LLP,” “LP,” “Ltd.,” “Co.,” or “Association,” you almost certainly must file Form 6. The consequence of guessing wrong and skipping the form is a Tax Court order to show cause why the case should not be dismissed. A common misconception is that disregarded entities — such as a single-member LLC taxed as a sole proprietorship — get a pass. They do not, because the filing rule keys off legal form, not tax classification.

Corporations (C-Corps and S-Corps)

C-corporations and S-corporations always file Form 6 when they petition. The S-corporation status under Subchapter S does not change the disclosure requirement, because Form 6 cares about state-law ownership, not federal tax classification. A consequence of missing this rule is that the petition gets flagged immediately by the clerk during the DAWSON e-filing intake.

A real-world example: Apex Medical Devices, Inc. petitions over a $400,000 deficiency. Apex must list every parent corporation, even foreign parents, and every publicly held owner that holds 10% or more of its stock. A common misconception is that S-corps with fewer than 100 shareholders can skip the form because they are “small.” Size does not matter; legal form does.

Partnerships and LLCs

Partnerships, limited partnerships, limited liability partnerships, and limited liability companies all file Form 6. The BBA partnership audit regime often makes the partnership representative the petitioner, but the partnership entity itself is the petitioner of record, so the partnership must disclose. The consequence of treating the partnership representative’s personal ownership as the entity’s ownership is a defective filing.

A real-world example: Riverbend Holdings, LLC, a Delaware LLC owned 60% by a publicly traded REIT, must list the REIT on Form 6. A common misconception is that LLCs taxed as partnerships disclose differently from LLCs taxed as corporations. They do not; the Form 6 disclosure rules are identical regardless of tax election under Treasury check-the-box regulations.

Trusts, Estates, and Edge Cases

Trusts and estates generally do not file Form 6 because they are not “corporations, partnerships, or limited liability companies” under Rule 20(c). However, business trusts that are taxed as corporations under Treas. Reg. § 301.7701-4(b) often do file. The consequence of guessing wrong here is a clerk’s rejection letter requiring a corrected filing.

A real-world example: the Marquez Family Trust, a simple trust under IRC § 651, petitions in Tax Court over a fiduciary income tax deficiency. The trust does not file Form 6. By contrast, a Massachusetts business trust treated as a corporation must file. A common misconception is that trustees personally file Form 6 — they do not; the trust files through its fiduciary if filing is required.

Step-by-Step: How to Fill Out Form 6

The current version of Form 6 is a single-page PDF with a caption block, three numbered sections, a signature line, and a service certification. You complete it after you have your docket number — or, if you are filing the petition simultaneously, you leave the docket number blank and let the clerk fill it in. Filing happens through DAWSON, the Tax Court’s electronic case management system, or by mail to 400 Second Street NW, Washington, DC 20217.

The plain-English flow is: fill caption, identify entity type, disclose parents, disclose 10% owners, sign, serve, file. The consequence of skipping any line is rejection. A common misconception is that you can attach an SEC 10-K and call it disclosure. You cannot; the court needs the names typed onto Form 6 itself.

Section 1: The Caption Block

The caption block at the top mirrors your petition. You type the petitioner’s full legal name on the left, the word “Petitioner(s)” beneath it, the word “Commissioner of Internal Revenue” as respondent, and the docket number on the right. If you have not yet received a docket number, write “To be assigned” in that field, which the DAWSON intake clerk will replace.

The consequence of mismatched captions between the petition and Form 6 is a docketing error that delays your case by 7 to 14 days. A real-world example: Sunrise Vineyards, LLC listed “Sunrise Vineyards LLC” on the petition but “Sunrise Vineyard, LLC” on Form 6, and the clerk bounced both filings. A common misconception is that capitalization and punctuation do not matter; they do, because DAWSON matches text strings when assembling the docket.

Section 2: Identifying the Entity Type

Form 6 asks the petitioner to state whether it is a corporation, partnership, LLC, LLP, or unincorporated association. You check the appropriate box or, if there is no box on your version, type the entity type on the line. Use the entity type recognized by your state of formation, not your federal tax classification.

The consequence of mislabeling — for example, calling an LLC a “corporation” because it elected corporate tax treatment — is a defective filing that the Tax Court may strike under Rule 34. A real-world example: Zenith Logistics LLC checked “corporation” because it elected C-corp taxation; the court ordered an amended Form 6. A common misconception is that “doing business as” names matter here — they do not; only the legal entity name and type matter.

Section 3: Listing Parent Corporations

You must list every “parent corporation,” meaning any entity that owns more than 50% of the petitioner’s voting stock or membership interests, directly or indirectly. The chain runs all the way up — if Parent A owns Parent B, which owns you, you list both. If there is no parent, write the word “None” in this section.

The consequence of leaving the section blank instead of writing “None” is a clerk’s query, because blank can mean “I forgot” or “no parent,” and the court will not guess. A real-world example: Dolphin Marine Supply, Inc., owned 100% by Atlantic Holdings Corp., which is owned 100% by Pacific Global PLC (a UK public company), must list both Atlantic Holdings Corp. and Pacific Global PLC. A common misconception is that foreign parents are exempt; they are not, because Rule 20(c) does not distinguish by nationality.

Section 4: Listing 10%+ Publicly Held Owners

You must list every publicly held corporation that owns 10% or more of the petitioner’s stock or membership interests. “Publicly held” means traded on a national securities exchange or registered under Section 12 of the Securities Exchange Act of 1934. Privately held 10% owners do not go on this line.

The consequence of disclosing a private 10% owner is over-disclosure that can violate confidentiality clauses in your operating agreement. A real-world example: Northstar Tech, LLC is owned 15% by Microsoft Corporation (publicly traded) and 30% by a private equity fund. The LLC discloses Microsoft but not the PE fund. A common misconception is that you must disclose all 10% owners regardless of public-versus-private status; the rule is narrower than that.

Section 5: Signature, Service, and Filing

The signer must be an officer, member, partner, or counsel of record. If counsel signs, the attorney must be admitted to practice before the Tax Court under Rule 200. You sign electronically through DAWSON’s e-signature feature or with an ink signature on a paper filing.

The consequence of an unauthorized signature — say, a bookkeeper signing for the LLC — is a defective filing the court will reject. A real-world example: Beacon Hill Consulting LLC had its CFO sign, but the CFO was not a member or counsel; the court ordered a corrected filing. A common misconception is that you must mail a paper copy to IRS counsel separately. You do not, because DAWSON automatically serves the IRS when you e-file.

Three Real-World Filing Scenarios

These three named scenarios cover the patterns you will likely face. Each one walks through the choices a petitioner makes and the consequence of each choice. Read them as templates you can adapt to your facts.

Scenario A: Single-Member LLC With No Parents

Maria Chen owns Chen Bookkeeping Services, LLC 100% personally. The IRS issues a Notice of Deficiency to the LLC. Maria petitions in the LLC’s name. On Form 6, she identifies the entity as an LLC, writes “None” under parent corporations, and writes “None” under 10% publicly held owners.

Filing Choice	Effect on the Case
Identify entity as “LLC”	Matches Delaware certificate of formation and avoids clerk query
Write “None” for parents	Confirms no upstream owner triggers conflicts
Write “None” for 10% public owners	Confirms no SEC-registered owner exists
Maria signs as sole member	Authorized signer under Rule 20(c)

Scenario B: Subsidiary of a Publicly Traded Parent

Falcon Aerospace, Inc. is owned 100% by Falcon Holdings Corp., which is publicly traded on the NYSE. Falcon Aerospace petitions over a $2.4 million deficiency. On Form 6, the company identifies as a corporation, lists Falcon Holdings Corp. as the parent, and lists Falcon Holdings Corp. again under publicly held 10% owners.

Disclosure Element	Why It Matters for Falcon
List Falcon Holdings Corp. as parent	Triggers judicial conflict screening
List Falcon Holdings Corp. as public 10% owner	Required because parent is NYSE-listed
File supplemental Form 6 if ownership shifts	Required under Rule 20(c)
Counsel signs through DAWSON	Faster than paper filing

Scenario C: Multi-Tier LLC With Mixed Ownership

Cedar Grove Realty, LLC is owned 40% by Apex REIT (publicly traded), 35% by Maple Capital Partners (private fund), and 25% by individual members. Cedar Grove petitions over a § 199A passthrough deduction dispute. On Form 6, Cedar Grove identifies as an LLC, writes “None” for parents (no single owner exceeds 50%), and lists Apex REIT under publicly held 10% owners.

Ownership Layer	Form 6 Treatment
Apex REIT (40%, public)	Listed as 10% public owner
Maple Capital (35%, private)	Not listed (private)
Individual members (25%)	Not listed (below 10% threshold individually)
No 50%+ owner	“None” in parent section

Mistakes to Avoid

Form 6 looks simple, but the Tax Court clerk’s office returns dozens of defective filings every week. The consequence of any one of these mistakes is delay, rework, and sometimes a show-cause order. Watch for these traps.

• Leaving sections blank instead of writing “None.” Blank fields confuse the clerk, who cannot tell the difference between a forgotten answer and a true negative.
• Listing private 10% owners. Over-disclosure can breach confidentiality clauses in operating agreements and is not required by Rule 20(c).
• Forgetting foreign parents. Foreign parent corporations must be disclosed even if they are not subject to U.S. SEC registration.
• Letting an unauthorized person sign. Only members, officers, partners, or counsel of record may sign, and a clerk will reject other signatures.
• Using the federal tax classification instead of the legal entity type. An LLC that elected corporate taxation is still an LLC for Form 6 purposes.
• Forgetting to file a supplemental Form 6 when ownership changes mid-case. Tax Court Rule 20(c) requires updates promptly after the change.
• Mailing Form 6 separately when the petition was e-filed in DAWSON. The disclosure must travel with the petition or be filed in the same docket.
• Mismatching captions between Form 6 and the petition. Even a missing comma can trigger a rejection.
• Skipping the form entirely because “we are a small business.” Size and revenue are irrelevant to Rule 20(c).
• Ignoring grandparent corporations. The disclosure chain includes every tier of upstream ownership, not just the immediate parent.

Do’s and Don’ts of Form 6

Use this list as a quick pre-flight check before you e-file in DAWSON. The “why” behind each rule comes directly from Tax Court practice or from federal disclosure precedent.

Do’s:

• Do file Form 6 with the petition itself, because attaching it later forces an amended filing under Rule 41.
• Do write “None” in any section that has no entries, because blank fields trigger clerk queries.
• Do list every tier of parent ownership, because Rule 20(c) requires the full chain.
• Do confirm public-company status by checking SEC EDGAR filings, because misclassification is the most common error.
• Do keep a calendar reminder to file a supplemental Form 6 if ownership changes during the case.

Don’ts:

• Don’t list private 10% owners, because Rule 20(c) limits disclosure to publicly held owners at that threshold.
• Don’t sign Form 6 unless you are a member, officer, partner, or counsel of record, because unauthorized signatures void the filing.
• Don’t substitute an SEC 10-K for Form 6, because the court requires the disclosure typed on the form itself.
• Don’t file Form 6 in the wrong docket, because misfiled disclosures do not satisfy the rule.
• Don’t ignore foreign parents, because nationality does not exempt an entity from Rule 20(c).

Pros and Cons of E-Filing Form 6 in DAWSON

Most petitioners now use DAWSON instead of paper filing, but each method has tradeoffs. Knowing both helps you choose the route that fits your situation.

Pros:

• E-filing produces an immediate timestamp, which protects you against Rule 25(a) deadline disputes.
• DAWSON automatically serves IRS Counsel, which removes a paper-service step.
• Electronic signatures comply with E-SIGN Act standards.
• The system flags missing fields before submission, which catches blank “parent” sections.
• Counsel can file from anywhere, which is especially useful for out-of-state attorneys admitted under Rule 200.

Cons:

• Pro se filers must register for a DAWSON account, which adds a 24- to 48-hour onboarding step.
• DAWSON outages, although rare, can force last-minute paper filings under Rule 22(d).
• Sealed filings require extra steps that paper filers do not face.
• Attachments larger than 250 MB must be split, which is annoying for large corporate disclosures.
• The system does not save partial drafts indefinitely, so unfinished filings can disappear.

Recap of Key Court Rulings on Disclosure

Although Form 6 itself rarely produces published opinions, several federal cases shape how the Tax Court interprets disclosure obligations. Liljeberg v. Health Services Acquisition Corp., 486 U.S. 847 (1988), is the foundational recusal decision — it held that a judge’s undisclosed financial interest can vacate a judgment even when the judge did not know of the interest.

Cheney v. U.S. District Court for D.C., 542 U.S. 367 (2004), reaffirmed that the § 455 recusal standard is objective, which is precisely what disclosure forms feed into. The Tax Court’s adoption of Rule 20(c) traces directly to those decisions, mirroring the corporate disclosure regimes of the Federal Rules of Civil Procedure and Federal Rules of Appellate Procedure.

A common misconception is that Liljeberg was reversed or weakened by later cases. It was not; it remains the leading authority and is the reason the Tax Court enforces Form 6 strictly. The consequence of treating disclosure casually is the worst outcome in litigation: a vacated decision after years of work.

State-Level Analogs and Why They Matter

Although the U.S. Tax Court is a federal court and the only court that uses Form 6 specifically, several state tax tribunals require analogous disclosures. The New York State Division of Tax Appeals, the California Office of Tax Appeals, and the Illinois Independent Tax Tribunal each have their own corporate disclosure rules.

The consequence of confusing federal and state disclosure rules is filing the wrong form in the wrong forum. A real-world example: Empire Foods Corp. filed Form 6 with a New York state petition; the state tribunal accepted the document but required New York’s own disclosure form as well. A common misconception is that one disclosure satisfies all forums. It does not, because each tribunal sets its own rules under its own enabling statute.

State analogs also matter because many entity petitioners file in both forums simultaneously. Coordinating disclosures across forums prevents inconsistent statements, which can be used against the petitioner in cross-examination if the cases overlap.

FAQs

Is Form 6 mandatory for every entity petitioner?

Yes. Every nongovernmental corporation, partnership, LLC, LLP, or unincorporated association petitioning the Tax Court must file Form 6 under Rule 20(c), even when the answer is “None” in every section.

Do individual taxpayers need to file Form 6?

No. Individual taxpayers — including sole proprietors, married couples filing jointly, and personal representatives of estates filing in their personal capacity — never file Form 6.

Does an S-corporation file Form 6 differently from a C-corporation?

No. Federal tax classification is irrelevant; both S-corps and C-corps file the identical Form 6 because Rule 20(c) keys off state-law entity form, not Subchapter S election.

Must I disclose private equity owners with 15% interests?

No. Form 6 only requires disclosure of publicly held corporations that own 10% or more of the petitioner; private funds, family trusts, and individuals are not listed there.

Do foreign parent companies have to be listed?

Yes. Rule 20(c) requires disclosure of every parent corporation regardless of nationality, including UK PLCs, Canadian corporations, and other non-U.S. entities.

Can a paralegal sign Form 6 for the firm?

No. Only members, officers, partners, or counsel of record admitted to the Tax Court bar under Rule 200 may sign Form 6 for the petitioner.

Do I file Form 6 again if ownership changes mid-case?

Yes. A supplemental Form 6 must be filed promptly under Rule 20(c) whenever a parent corporation or 10% publicly held owner changes during the litigation.

Is paper filing of Form 6 still allowed?

Yes. Paper filing remains available by mail to 400 Second Street NW, Washington, DC 20217, although DAWSON e-filing is faster, timestamped, and now used by most petitioners.

Will the IRS see my Form 6?

Yes. Form 6 is served on IRS Counsel automatically through DAWSON and becomes part of the public docket unless sealed under a protective order.

Can the Tax Court dismiss my case for missing Form 6?

Yes. The court can issue a show-cause order under Rule 25 and ultimately dismiss the petition for failure to comply with Rule 20(c), although clerks usually allow time to cure the defect.