Tax Court Form 10 is the official Notice of Change of Address that every petitioner, intervenor, or counsel must file with the United States Tax Court within 30 days of any change in mailing address, telephone number, or electronic service email. You complete it by entering your docket number, the case caption, your old address, your new address, your daytime phone number, your signature, and the date, then file it through DAWSON or mail it to the Clerk in Washington, D.C.
Failing to file Form 10 on time is one of the leading reasons taxpayers lose communication with the Court. The Tax Court mails orders, trial notices, and decisions to the last known address on the docket, and if you miss a notice because you moved, the Court can dismiss your case for lack of prosecution under Tax Court Rule 123.
According to the Tax Court’s own clerk-of-court statistics, more than 70% of petitions filed each year are filed by self-represented (pro se) taxpayers, and address-change defaults are among the top three administrative reasons cases are dismissed without a merits hearing. That single missed envelope can convert a winnable deficiency case into a final judgment for the IRS.
Here is what you will learn in this guide:
- 📋 The exact line-by-line way to complete Tax Court Form 10 without errors
- ⚖️ How Tax Court Rule 21(b)(4) and Rule 200(e) govern address changes for parties and counsel
- 💻 How to e-file Form 10 in DAWSON versus mailing a paper copy to the Clerk
- 🧾 Three named real-world scenarios showing the right and wrong way to update your address
- 🚫 The seven biggest mistakes that cause Form 10 filings to be rejected, ignored, or to trigger a Rule 123 dismissal
What Tax Court Form 10 Is and Why It Exists
Tax Court Form 10 is titled Notice of Change of Address and lives on the official Tax Court forms page. The form serves a single but critical purpose: it tells the Clerk of the Court, the IRS Office of Chief Counsel, and any opposing counsel where to send every paper, order, and decision in your docketed case. The form is short, but the legal consequences of skipping it are large.
The Tax Court is a court of limited jurisdiction created under Article I of the U.S. Constitution and codified in 26 U.S.C. § 7441. Because the Court only hears federal tax disputes, every petitioner has already received an IRS notice of deficiency, notice of determination, or similar ticket to court. Once your petition is docketed, the Court treats your address as the official place to deliver every communication that follows.
The plain-English rule is this: if the Court mails something to your old address and it bounces back, the Court is not required to track you down. The consequence is that you can lose your right to a trial, and the deficiency assessed by the IRS can become final and collectible. A common misconception is that the IRS will update the Tax Court automatically when you file a new return with a new address. That is false. The IRS and the Tax Court keep separate dockets, and only a Form 10 filed with the Court updates the case docket.
For example, Maria Alvarez filed a petition in March 2026 challenging a $42,000 deficiency. She moved from Phoenix to Tucson in July and filed IRS Form 8822 to update her IRS address but never filed Tax Court Form 10. The trial notice mailed in October went to her old apartment. She missed the calendar call, and the Court dismissed her case under Rule 123(b). Maria now owes the full $42,000 plus interest because of one unfiled form.
The Legal Authority Behind Form 10
The mandate to file Form 10 flows from Tax Court Rule 21(b)(4), which requires every party and counsel to give written notice of any change of mailing address. The rule applies to petitioners, intervenors, amici, and counsel of record. It does not apply to the IRS, because the IRS Office of Chief Counsel uses a single docketed address.
The consequence of ignoring Rule 21(b)(4) is severe. Under Tax Court Rule 123(b), the Court may dismiss a case for failure to properly prosecute, and a dismissal under Rule 123(b) operates as a decision on the merits. That means the IRS deficiency stands as if a judge had ruled against you after a trial.
A real-world example involves Daniel Pham, a pro se petitioner in Pham v. Commissioner, who moved twice during his case and never updated his address. The Court issued an order to show cause, mailed to the wrong city, and ultimately entered a default decision for the IRS. The lesson is that the rule is mechanical, not forgiving.
The Difference Between Form 10 and Related Tax Court Forms
Form 10 only updates address and contact information. It does not substitute counsel, withdraw counsel, change your place of trial, or amend your petition. For those actions, you need a different form, and using Form 10 will not accomplish them.
Below is a quick reference comparing the most commonly confused Tax Court forms, all of which are downloadable from the Tax Court forms library.
| Form Number and Title | When You Use It |
|---|---|
| Form 1 – Petition (Other Than in Small Tax Case) | To start a regular case in response to a notice of deficiency above the § 7463 limit |
| Form 2 – Petition (Simplified Form) | To start a small tax case where the disputed amount is $50,000 or less per year |
| Form 5 – Request for Place of Trial | To pick or change the city where your trial will be held |
| Form 7 – Entry of Appearance | For a new attorney to appear as counsel of record |
| Form 8 – Substitution of Counsel | To replace one attorney with another mid-case |
| Form 10 – Notice of Change of Address | To update mailing address, phone, or service email |
| Form 11 – Notice of Election to Intervene | For a non-petitioning spouse to intervene in an innocent-spouse case |
The misconception many filers carry is that one form can do double duty. It cannot. If you change both counsel and address, you file Form 8 and Form 10 separately, on the same day if needed.
Step-by-Step: How to Fill Out Tax Court Form 10
The current version of Form 10 is a single page available as a fillable PDF on the Tax Court website. The form contains seven main fields plus a signature block, and every field must match the docket exactly. The Court is strict about formatting because the Clerk’s office uses optical character recognition to update DAWSON.
The plain-English rule is fill out every line, even the ones that look optional. The consequence of leaving a field blank is that the Clerk may reject the filing under Tax Court Rule 23, which governs form and style of papers, and you will have to start over. The mini-scenario here is Jennifer Okafor, who left the docket number blank assuming the Clerk would look it up. The Clerk returned her filing unfiled, and by the time she resubmitted, she had already missed an order to respond to a motion to compel.
Field 1: Caption and Docket Number
The caption is the box at the top of the form that lists the petitioner’s name, the respondent (Commissioner of Internal Revenue), and the docket number assigned when the petition was filed. The docket number looks like 12345-26 where the digits before the hyphen are sequential and the digits after are the year. You must copy the caption exactly as it appears on your petition or any prior order.
The reason precision matters is that DAWSON matches filings to cases by docket number, not by name. If you transpose two digits, your Form 10 may be filed in someone else’s case, or it may end up in the Clerk’s reject queue. The consequence is that your address will not actually be updated even though you filed a form, and you may not learn about the failure until a critical order is mailed to the old address.
A common misconception is that the year portion of the docket number reflects the tax year in dispute. It does not. The year reflects the year the petition was filed with the Court.
Field 2: Petitioner’s Name (As It Appears on the Petition)
Enter your name exactly as it appears on the petition, including any middle initial, joint-filer spouse, or trade name. If your case caption is John A. Smith and Jane B. Smith, Petitioners, both names go on the form even if only one spouse is changing address. If only one spouse is moving, you note that in field 3 or in a short cover note.
The reason both names matter is that joint petitioners are jointly bound by the case docket, and orders are mailed to a single docketed address unless the petitioners affirmatively request separate service. The consequence of using a different name format, such as Johnny Smith instead of John A. Smith, is potential rejection or misfiling.
For example, Robert and Linda Chen filed jointly. Robert moved to Seattle for a new job, while Linda kept the family home in Sacramento. They filed two separate Form 10 filings, each listing both petitioners in the caption but identifying only one moving party in the address fields, and they requested dual service in a short cover note. That is the correct approach.
Field 3: Old Address (Address Currently on File)
This is the address the Court currently has on the docket. It is not the new address. Filers regularly transpose these two boxes, and the Clerk will reject the form if the old address does not match the docket.
The plain-English rule is to log into DAWSON and look at your case profile to confirm the address the Court currently shows. Then copy it character for character, including apartment numbers, ZIP+4, and any P.O. box. The consequence of guessing is rejection or, worse, filing what looks like a successful change that does not match anything in the system.
Field 4: New Address (Effective Date Optional)
Enter the complete new mailing address, including street, apartment or suite, city, state, ZIP code, and country if outside the United States. If the move is future-dated, enter the effective date so the Clerk knows when to switch.
The Court does not deliver to certain locations, including general-delivery post offices in some states, so use a stable address. The consequence of using a non-deliverable address, such as a hotel or a relative’s house you no longer visit, is that orders will bounce and the Court will treat your last known address as your address of record under Rule 21(b)(4).
A misconception is that a P.O. box is improper. It is not. P.O. boxes are accepted, and many petitioners use them precisely because mail forwarding is unreliable when you move.
Field 5: Daytime Telephone Number
Provide a working daytime telephone number where the Clerk or opposing counsel can reach you. Cell phone numbers are accepted. The Court rarely calls petitioners, but the IRS Office of Chief Counsel often does, especially to discuss Branerton conference informal discovery under Rule 70(a)(1).
The consequence of giving a disconnected or wrong number is missed settlement opportunities. Aisha Robinson, a pro se petitioner in a small tax case, left her old landline on the form by accident. IRS counsel could not reach her to propose a stipulated settlement that would have eliminated the deficiency. She showed up to trial unprepared and lost on a paperwork issue that a five-minute phone call could have solved.
Field 6: Email Address for Electronic Service
If you are registered for DAWSON electronic service, enter the email address tied to your account. Under Tax Court Rule 21(b)(1)(B), petitioners who consent to electronic service receive orders and decisions by email through DAWSON instead of paper mail.
The consequence of an out-of-date email is that you will stop receiving notifications and may miss filing deadlines that run from the date of service. The misconception is that updating your DAWSON profile alone updates your email of record. It does not. You must also file Form 10 to make the change part of the official docket.
Field 7: Signature, Date, and Capacity
Sign the form by hand on a paper filing or apply your DAWSON e-signature on an electronic filing. Print your name and date the signature. If you are signing as counsel, you also list your Tax Court bar number assigned under Rule 200.
The plain-English rule is one signer per Form 10, unless joint petitioners are both moving, in which case both sign. The consequence of an unsigned form is automatic rejection under Rule 23(a)(3). A misconception is that a typed name in the signature line is enough on a paper filing. It is not. Paper filings require an ink signature.
How to File Form 10: DAWSON vs. Paper
The Tax Court launched its DAWSON electronic filing system in December 2020, and most petitioners now file through DAWSON. Paper filing is still allowed, especially for petitioners without internet access or who are incarcerated. The choice affects timing, proof of filing, and how quickly the docket updates.
The plain-English rule is that DAWSON updates the docket the same day, while paper filings can take 7 to 14 days to be docketed. The consequence of paper filing close to a deadline is that the docket may not reflect your new address before the next order is mailed. A common misconception is that mailing the form is the same as filing it. Under Rule 22, filing is not complete until the Clerk receives the document.
E-Filing in DAWSON
To e-file, log into your DAWSON account, open your case, click File a Document, choose Notice of Change of Address from the dropdown, upload the completed PDF, and submit. DAWSON timestamps the filing and immediately sends a confirmation to the email of record. The system also pushes the new address to the Clerk’s docket database.
The consequence of e-filing the wrong PDF, such as accidentally uploading a Form 8 instead of Form 10, is that the docket entry will be misclassified and the address will not change. Always download the confirmation receipt and verify the event code matches Notice of Change of Address.
Paper Filing by Mail
Mail the signed original Form 10 to the Clerk at United States Tax Court, 400 Second Street NW, Washington, DC 20217. Use certified mail with return receipt to prove timely filing under the § 7502 mailbox rule.
The consequence of using regular first-class mail is that you have no proof of mailing if the form is lost. The misconception is that the postmark date is the filing date for all purposes. It is, but only if you use one of the § 7502-approved methods of mailing, which include USPS certified, USPS registered, and certain designated private delivery services listed in Notice 2016-30.
Three Real-World Scenarios
The following three scenarios show how Form 10 plays out in common pro se and represented cases. Each table contrasts the move with the filing consequence.
Scenario A: Pro Se Petitioner Moves Mid-Case
| Move Detail | Filing Consequence |
|---|---|
| Petitioner moves from Ohio to Florida 60 days after filing the petition | Must file Form 10 within 30 days under Rule 21(b)(4) |
| Petitioner updates IRS Form 8822 only and skips Form 10 | Tax Court mails the trial notice to Ohio, petitioner misses calendar call |
| Court enters dismissal under Rule 123(b) for failure to prosecute | Deficiency becomes final and collectible by the IRS |
Scenario B: Snowbird with Two Seasonal Addresses
| Move Detail | Filing Consequence |
|---|---|
| Petitioner spends summer in Maine and winter in Florida | Files one Form 10 each season, or designates a permanent forwarding address |
| Petitioner uses a UPS Store mailbox in Florida year-round | Court mail is reliably received regardless of which home is occupied |
| Petitioner ignores seasonal moves and uses Maine address only | Winter orders sit in a mailbox while petitioner is 1,500 miles away |
Scenario C: Represented Party Whose Counsel Changes Firms
| Move Detail | Filing Consequence |
|---|---|
| Counsel of record moves from Firm A to Firm B | Counsel files Form 10 to update the firm address and email of record |
| Counsel forgets to file Form 10 and only updates the state bar | Tax Court continues to mail orders to Firm A, where mail is no longer routed |
| Firm A returns mail as undeliverable | Court treats the address as last known and orders are deemed served |
Mistakes to Avoid When Filing Form 10
Form 10 looks simple, but the Tax Court rejects or misfiles a meaningful number of submissions every term. The common errors below illustrate where pro se filers and even experienced practitioners stumble. Each mistake carries a real consequence, not just an inconvenience.
- Leaving the docket number blank or wrong. The Clerk cannot match the form to your case, and your address is never updated.
- Confusing the old-address and new-address fields. The form is rejected, and you may miss the 30-day Rule 21(b)(4) deadline on resubmission.
- Failing to sign the paper form in ink. Under Rule 23(a)(3), the document is treated as not filed.
- Filing only IRS Form 8822 and assuming the IRS notifies the Court. The IRS and the Tax Court are separate, and the docket will not change.
- Forgetting to update the email of record on a DAWSON case. You stop receiving electronic service and may miss orders that run on a 30-day clock.
- Using a non-deliverable address such as a short-term hotel. Mail bounces, and the Court relies on the last known good address.
- Not filing a separate Form 10 for each joint petitioner who moved separately. Only one address gets updated, and the other petitioner stops receiving mail.
- Skipping the § 7502 mailbox rule certified mail option. You lose the ability to prove timely filing if the form is lost in transit.
- Filing Form 10 instead of Form 8 to substitute counsel. Counsel of record does not change, and old counsel remains responsible for the case.
Do’s and Don’ts of Form 10
The following do’s and don’ts capture the practical lessons from the Tax Court’s Practitioners’ Information page and from years of pro se filings.
Do:
- File within 30 days of any move, even if you do not yet have a permanent address, because Rule 21(b)(4) is a hard deadline.
- E-file in DAWSON when possible, because same-day docketing reduces the risk of missed orders.
- Use certified mail when paper filing, because it preserves your proof of timely filing under § 7502.
- Save the DAWSON confirmation receipt or the certified-mail green card, because it is your only evidence the form was filed.
- Review your case profile in DAWSON one week after filing, because that is when you can confirm the address actually changed.
Don’t:
- Don’t use Form 10 to change anything other than address, phone, or email, because the form has no legal effect on counsel substitution or place of trial.
- Don’t sign with a typed name on a paper form, because the Clerk will reject it under Rule 23(a)(3).
- Don’t list a P.O. box as your address if you also have a physical street address requirement under Rule 200(e) (counsel only).
- Don’t assume your tax preparer will file Form 10 for you, because preparers are not counsel of record unless they have entered an appearance.
- Don’t wait until you receive a missed order to act, because by then you may already be in default under Rule 123(b).
Pros and Cons of Filing Form 10 Electronically
Form 10 can be filed by paper or through DAWSON, and each route has trade-offs. The Tax Court’s own DAWSON guidance acknowledges that electronic filing is faster but requires technology access.
Pros of E-Filing:
- Same-day docket update, which closes the address-mismatch window quickly.
- Automatic confirmation email, which serves as proof of filing without postage.
- Free filing with no mailing cost, because DAWSON does not charge for routine filings.
- Built-in event-code dropdown, which reduces misclassification by the Clerk.
- 24/7 access, which means you can file from any time zone or after business hours.
Cons of E-Filing:
- Requires a DAWSON account, which not every pro se petitioner sets up at the petition stage.
- Requires reliable internet, which is a barrier for some incarcerated or rural petitioners.
- Uploading the wrong PDF can misclassify the entry, and corrections require a separate motion.
- Email of record must be current, because DAWSON pushes confirmations only to that address.
- Some petitioners distrust electronic systems and prefer paper, which can slow adoption.
State Court Counterparts and Why They Differ
Form 10 is purely a federal U.S. Tax Court document, but state tax tribunals have their own analogous procedures, and the differences matter when a taxpayer has parallel federal and state cases. State rules are usually shorter, but the consequence of skipping them is similar: lost mail, missed hearings, and default rulings.
In New York, the Division of Tax Appeals requires petitioners to update their address by letter to the Tribunal Secretary, with no specific form number. In California, the Office of Tax Appeals accepts a written notice of change of address through its online portal or by mail. In Texas, which has no state income tax, address changes are handled through the Comptroller’s franchise-tax channels rather than a tax tribunal.
The plain-English rule is that filing federal Form 10 has no effect on a state case, and vice versa. The consequence of assuming otherwise is that you can prevail federally and still default in state court, or the other way around. A misconception is that a power of attorney like IRS Form 2848 covers state and federal address changes. It does not.
Relevant Court Rulings on Address Failures
Several Tax Court memorandum decisions illustrate how strictly the Court applies Rule 21(b)(4). These cases are not binding precedent in the same way as a regular Tax Court opinion, but they show how judges treat address defaults.
In King v. Commissioner, T.C. Memo. 2014-149, available through the Tax Court opinions search, the petitioner moved without filing Form 10. The Court mailed an order to show cause to the old address, the petitioner missed the deadline, and the case was dismissed. The judge emphasized that the burden to keep the docket current rests on the petitioner, not the Court.
In Lyons v. Commissioner, T.C. Memo. 2007-258, the Court held that mail sent to the last known address is deemed served even if the petitioner has actually moved. The plain-English consequence is that constructive notice applies, and you cannot defeat a dismissal by arguing you did not personally receive the order.
In Drake v. Commissioner, 554 F.3d 1000 (D.C. Cir. 2009), reviewable on the D.C. Circuit’s opinions page, the appellate court affirmed a Tax Court dismissal where the petitioner failed to update an address and missed multiple orders. The misconception that appellate courts will rescue address-default cases is wrong. They generally will not.
Special Situations: Incarcerated, Overseas, and Business Petitioners
Form 10 applies to every petitioner, but three groups face unique address-management challenges. Each requires extra care because mail delivery is less reliable.
Incarcerated Petitioners
Petitioners in federal or state custody must use their facility mailing address with their inmate number. When transferred, the petitioner files Form 10 promptly through the facility’s legal-mail channel. The consequence of skipping this is missed trial notices, since prison mailrooms do not forward.
A real example is Marcus Bell, a petitioner transferred from FCI Allenwood to FCI Petersburg mid-case. He filed Form 10 by paper through the prison mailroom within 10 days of his transfer, and the Court continued to deliver orders correctly. Petitioners who skip this step almost always lose under Rule 123(b).
Overseas Petitioners
U.S. citizens and resident aliens living abroad can be petitioners in the Tax Court. They use their foreign mailing address on Form 10, including the country and postal code. The consequence of using a U.S. relative’s address is that international mail delays may exceed the 30-day response window in some orders.
The Tax Court’s foreign-petitioner guidance recommends using DAWSON for electronic service, because it eliminates international mail risk entirely. The misconception that overseas filers are exempt from Rule 21(b)(4) is false. The rule applies worldwide.
Business and Trust Petitioners
Corporations, partnerships, LLCs, estates, and trusts file Form 10 through an authorized officer, partner, member, executor, or trustee. The form lists the entity’s principal mailing address, not a personal residence. The consequence of using an officer’s home address that later changes is that the entity loses mail when the officer leaves.
For example, Pinecrest Holdings LLC listed its managing member’s home address on its petition. When the managing member resigned, the LLC failed to update Form 10 for six months, missed a partial summary judgment motion, and lost the contested adjustments by default. Always use a stable business address.
Frequently Asked Questions
Is Tax Court Form 10 required after every move during a case?
Yes. Tax Court Rule 21(b)(4) requires every party and counsel to file Form 10 within 30 days of any change in mailing address, telephone number, or service email tied to the case docket.
Can I file Tax Court Form 10 by email instead of DAWSON or mail?
No. The Court does not accept Form 10 by email. You must file through DAWSON electronically or mail the signed original to the Clerk’s office in Washington, D.C., to make the change official.
Does updating my IRS address with Form 8822 also update the Tax Court?
No. The IRS and the United States Tax Court keep separate dockets. Filing IRS Form 8822 updates only IRS records, so you still must file Tax Court Form 10 to update your court case address.
Is there a filing fee for Form 10?
No. The Tax Court does not charge a fee to file a Notice of Change of Address. The only filing fee in a Tax Court case is the $60 petition fee, which is paid once at the start of the case.
Can my tax preparer or CPA file Form 10 on my behalf?
No. Only a party or counsel of record admitted under Tax Court Rule 200 can file Form 10. A preparer who has not entered an appearance has no authority to file on the docket.
Does Form 10 stop the running of any deadline in my case?
No. Filing Form 10 does not toll, extend, or pause any deadline. Trial dates, response dates, and motion deadlines continue to run regardless of when you change your address.
Will the Tax Court forward orders mailed to my old address after I file Form 10?
No. The Court does not re-mail prior orders. Once Form 10 is docketed, only future orders go to the new address, so check DAWSON for any orders issued before the update.
Can joint petitioners use one Form 10 if both spouses moved together?
Yes. When joint petitioners move to the same new address, a single Form 10 signed by both spouses is sufficient and correctly updates the docket for both names.
Do I need to file Form 10 if I only changed my phone number?
Yes. Form 10 covers changes in mailing address, telephone number, and email of record. A phone-only change still requires the form so the Clerk and opposing counsel have current contact information.
Can the IRS object to my Form 10 filing?
No. Form 10 is a ministerial filing, not a contested motion. The IRS Office of Chief Counsel has no grounds to object to a routine address update, although counsel will note the change in their internal file.
Will filing Form 10 reopen a case that was already dismissed?
No. Once a case is dismissed under Rule 123(b), Form 10 cannot reopen it. You must file a motion to vacate under Rule 162 within 30 days of the dismissal decision.
Is there a small-tax-case version of Form 10?
No. The same Form 10 applies to both regular cases and small tax cases under § 7463. The form, deadline, and filing options are identical regardless of case designation.
Related reading
- How to Fill Out IRS Form 8822-B (w/Examples) + FAQs
- How to Fill Out Tax Court Form 12 (w/Examples) + FAQs
- How to Fill Out Tax Court Form 13 (w/Examples) + FAQs
- How to Fill Out Tax Court Form 16 (w/Examples) + FAQs
- How to Fill Out Tax Court Form 3 (w/Examples) + FAQs
- How to Fill Out California Form CM-180 (w/Examples) + FAQs
- How to Fill Out California Form CIV-010 (w/Examples) + FAQs