The Notice of Deficiency is one of the most consequential documents the IRS can send a client. It defines a strict window for the taxpayer's response, and the window cannot be extended. What happens next, whether the taxpayer pays and files a refund claim, does nothing and lets the IRS assess, or files a Tax Court petition, determines every aspect of how the dispute is resolved. Practitioners who have not navigated a Tax Court case before can find the process unfamiliar and the deadline pressure acute. This guide is built to close that gap.
This guide covers the complete Tax Court petition workflow for practitioners: what the Notice of Deficiency is and the four options the taxpayer has within the 90-day window, the forum selection decision between Tax Court, District Court, and the Court of Federal Claims, Small Tax Case (S-case) procedure under IRC 7463, how to complete and file Form 2 via DAWSON, what happens after the petition is filed, T.C. Summary Opinions and why they cannot be appealed, how a filed petition changes the Appeals settlement dynamic, trial preparation if settlement fails, who can represent clients in Tax Court, and the appellate options from a regular Tax Court Opinion. The upstream step is the IRS Appeals practitioner protest guide; in cases where the examination result was not contested through Appeals, the IRS audit reconsideration guide covers an alternative path.
All procedural information in this guide should be verified at ustaxcourt.gov and IRS.gov before relying on it in any specific matter. Tax Court rules are subject to amendment. This guide is informational and does not constitute legal advice. Tax Court litigation involves complex procedural rules, evidence standards, and legal analysis; practitioners who have not previously handled a Tax Court case should evaluate whether a client's case warrants consultation with an attorney experienced in Tax Court practice.
The Notice of Deficiency: What It Is, What It Means Legally, and the Four Options
A Notice of Deficiency (commonly called the 90-day letter) is the IRS's formal written notification that it has determined the taxpayer owes additional tax and intends to assess that tax. It is not a bill; it is a formal legal document that triggers the taxpayer's right to petition the U.S. Tax Court. The IRS cannot assess the deficiency stated in the notice during the 90-day window, which means the taxpayer has time to act before the assessment becomes final.
CP2000 proposals that go unanswered escalate to a statutory notice of deficiency, which triggers Tax Court petition rights; see our CP2000 Response Practitioner Workflow to understand the full escalation path before a 90-day letter issues.
What the Notice of Deficiency contains
The notice states: the amount of the proposed deficiency for each tax year at issue, the taxable year(s) to which the notice applies, the adjustments that produced the deficiency (often by reference to an attached examination report), the deadline for petitioning Tax Court, and the address to which the petition should be mailed (the Tax Court Clerk, Washington, D.C.). The notice also informs the taxpayer that if they do not petition the Tax Court within the 90-day period, the IRS will assess the deficiency and begin collection.
The four options within the 90-day window
Petition the U.S. Tax Court
Filing a Form 2 petition with the U.S. Tax Court prevents the IRS from assessing the deficiency while the case is pending. The taxpayer does not pay the disputed tax before the case is resolved. If the taxpayer prevails, the deficiency is not assessed. If the IRS prevails, the deficiency is assessed after the Tax Court decision becomes final. This is the "pay nothing upfront" path: the taxpayer fights first and pays (if they lose) later. This guide covers this option in detail in the sections below.
Pay the tax and file a refund claim
The taxpayer may pay the full amount of the deficiency, wait for the IRS to reject the refund claim (or wait six months with no IRS action), and then file a refund suit in U.S. District Court or the U.S. Court of Federal Claims. This is the "pay now, sue later" path. It is the only option that accesses the District Court or Court of Federal Claims for income tax disputes. The main advantages are access to a jury trial (District Court only) and different precedential framework. The main disadvantage is that the taxpayer must pay the full deficiency before litigating.
Attempt to re-engage IRS Appeals
Under current IRS procedures, it may be possible to contact Appeals directly about a case that is at the deficiency notice stage, even after a prior Appeals conference did not resolve the case. However, once a Tax Court petition is filed, the case shifts to the Chief Counsel track and the docketed Appeals conference is the formal settlement mechanism. Attempting to informally re-engage Appeals without filing the Tax Court petition risks allowing the 90-day window to expire without preserving Tax Court rights. Do not allow the 90-day deadline to pass while pursuing informal resolution attempts.
Do nothing (accept the deficiency)
If the taxpayer takes no action within the 90-day window, the IRS assesses the deficiency stated in the notice and begins the collection process. This is the appropriate choice only when the taxpayer agrees that the deficiency is correct and intends to pay it. The IRS will then issue a billing notice and the taxpayer can arrange a payment plan if needed. Doing nothing by mistake is irreversible with respect to Tax Court jurisdiction; the taxpayer cannot petition Tax Court after the 90-day window closes.
The 90-Day Deadline: Why It Cannot Be Extended
The 90-day deadline for petitioning Tax Court is jurisdictional, not procedural. Courts have held repeatedly that the Tax Court has no authority to waive or extend this deadline, even for compelling circumstances, even by mutual agreement of the parties, and even when the late filing was caused by IRS error (absent specific equitable circumstances that the courts have recognized only narrowly). Missing the 90-day deadline by one day is the same as missing it by a year: the Tax Court has no jurisdiction.
How the deadline is calculated
The 90-day period runs from the date the Notice of Deficiency is mailed, not the date it is received. If the taxpayer's mailing address at the time the notice was issued is outside the United States, the period is 150 days. The 90-day (or 150-day) period is extended to the next business day when the last day falls on a Saturday, Sunday, or federal legal holiday. A petition that is received after the deadline but was timely mailed (using the mailbox rule under IRC 7502) may still be timely; verify the current application of the mailbox rule to Tax Court petitions at ustaxcourt.gov.
CALENDAR THE DEADLINE IMMEDIATELY WHEN THE CLIENT RECEIVES THE NOTICE
The single most common and most catastrophic Tax Court mistake is a missed deadline. When a client contacts you about a Notice of Deficiency, the first action is to calculate and calendar the petition deadline before anything else. Count from the date on the notice face, not the date the client received it. If a missed Tax Court petition deadline results in a client losing their right to contest a deficiency, the practitioner faces significant malpractice exposure. See the professional liability and E&O insurance guide for coverage types that address missed petition deadline malpractice claims.
Tax Court vs. District Court vs. Court of Federal Claims: The Forum Selection Decision
Three federal courts have jurisdiction to resolve federal tax disputes: the U.S. Tax Court, the U.S. District Court, and the U.S. Court of Federal Claims. Each has different procedural rules, precedential frameworks, and cost structures. The forum selection decision requires a case-specific analysis.
U.S. Tax Court: the default forum for most practitioners
The Tax Court is the most common forum for individual and small-business tax disputes for three reasons: the taxpayer does not have to pay the disputed tax before litigating; Tax Court judges specialize in federal tax law; and the Small Tax Case procedure provides a low-cost option for smaller disputes. Tax Court jurisdiction over income tax deficiencies arises from the Notice of Deficiency. Tax Court also has jurisdiction over certain collection matters under IRC 6330 (see the IRS Collection Due Process hearing guide). The Tax Court hears cases without a jury.
U.S. District Court: the jury trial option
The U.S. District Court has jurisdiction over federal tax refund suits (where the taxpayer pays first and then sues for a refund). District Court provides the only federal tax jury trial option, which can be valuable in cases where the facts are sympathetic but the law is adverse. The District Court judge is a generalist, not a tax specialist, which can be an advantage or a disadvantage depending on the issue. District Court cases generally take longer and cost more than Tax Court cases. The filing fee is higher and the procedural rules (Federal Rules of Civil Procedure) are more complex than Tax Court rules.
U.S. Court of Federal Claims: specialized refund litigation
The Court of Federal Claims also has jurisdiction over federal tax refund suits (after paying the disputed tax). It is a specialized court that hears claims against the United States. Cases are decided by judges without juries. The Court of Federal Claims has its own precedential history, which may be more favorable to the taxpayer on specific issues than either Tax Court or District Court precedent. It is used less frequently than the other two forums and is most appropriate when the precedential landscape in the Court of Federal Claims is specifically favorable to the taxpayer's position.
Small Tax Case (S-Case) Procedure: Cap, Waiver of Appeal Rights, and Strategic Tradeoffs
The Small Tax Case procedure under IRC 7463 is designed to give individuals and small businesses a simpler, faster, and less expensive path through Tax Court for smaller disputes. But the procedural simplification comes with a significant strategic cost: the waiver of all appeal rights.
Eligibility: the $50,000 per-year cap
The Small Tax Case procedure under IRC 7463 is available when the amount in dispute is $50,000 or less per tax year at issue (not in aggregate across years); verify the current cap at ustaxcourt.gov. A case involving two years under examination, each with $40,000 in dispute, qualifies for S-case procedure even though the total across both years is $80,000. The eligibility amount includes the tax deficiency, penalties, and any additions to tax proposed in the Notice of Deficiency for each year separately.
How S-cases work procedurally
S-cases are assigned to a Special Trial Judge rather than a Tax Court judge. The procedural rules are simplified compared to regular Tax Court cases: discovery is limited, the rules of evidence are applied less strictly, and the trial is typically shorter and more informal. The IRS is often represented by a revenue agent or appeals officer rather than a Counsel attorney in S-cases. S-cases typically move faster from petition to trial or settlement than regular Tax Court cases. The T.C. Summary Opinion issued in an S-case is not published in the Tax Court Reports and has no precedential value even for the parties (it binds only the case in which it was issued).
The appeal rights waiver: the critical limitation
The most important limitation of S-case procedure is that T.C. Summary Opinions cannot be appealed. A taxpayer who elects S-case procedure and receives an unfavorable T.C. Summary Opinion has no further judicial remedy. This is a permanent consequence: the taxpayer cannot decide after a bad outcome that the case should have been handled as a regular Tax Court case. For cases where the amount is at or near the eligibility cap, where the legal issue has potential value beyond the specific taxpayer, or where there is any realistic chance that an unfavorable outcome would warrant appeal, the regular Tax Court procedure is the appropriate choice.
WHEN S-CASE MAKES SENSE AND WHEN IT DOES NOT
S-case procedure makes sense when: the factual dispute is straightforward, the amount is well below the eligibility cap, the legal issue is not novel or complex, the cost of regular Tax Court procedure is disproportionate to the amount, and an unfavorable outcome is not likely to warrant an appeal. S-case is strategically inferior when: the legal issue has value if appealed, the amount is close to the cap, the case involves complex facts or law, or the practitioner or client would want the option to appeal if the Tax Court rules against them. When in doubt, file as a regular case; the taxpayer can elect S-case procedure before trial but not after.
Form 2 Petition: Completion and Common Errors
The Form 2 petition is the official Tax Court petition form. It is available at ustaxcourt.gov. Using the official form is required; a self-drafted petition that does not follow the Tax Court's format may be returned. The form is structured in four parts.
Petitioner information and address
Part I identifies the petitioner (the taxpayer or taxpayers). For joint returns, both spouses must be named as petitioners unless one is deceased. The address on the petition must be current and accurate: the Tax Court will use this address for all notices and correspondence. If the taxpayer has recently moved, use the current address, not the address on the tax return that is the subject of the dispute. The court's rules specify the format for the petitioner's name (individual vs. entity vs. estate).
Notice of Deficiency identification
Part II identifies the Notice of Deficiency being contested: the date of the notice, the IRS office that issued it, the tax year(s) at issue, and the amount(s) of the deficiency. This information is taken directly from the notice. Errors in identifying the notice or the tax years can result in the petition being returned as deficient. Attach a copy of the Notice of Deficiency to the petition (or upload it as a required attachment in DAWSON).
Statement of error and facts
Part III is the substantive section: the statement of the errors the taxpayer alleges the IRS made in the Notice of Deficiency and a concise statement of the facts. The Tax Court requires that this section identify specific errors, not merely assert that the IRS is wrong. Common errors to identify: the IRS disallowed a deduction that was properly substantiated, the IRS determined income that was not received or was reported on a different return, the IRS misapplied a legal standard. The statement of facts should be concise and factually specific. The petition is not a brief; it is a short statement of the dispute. Fuller legal argument comes later in the litigation process.
S-case election and signature
Part IV includes the S-case election checkbox (if the taxpayer is electing small case procedure) and the taxpayer's signature. The practitioner does not sign the petition in place of the taxpayer; the taxpayer signs. If the taxpayer is represented, the representative's information is also included. The filing fee must accompany the petition (or be paid electronically in DAWSON). Verify the current filing fee at ustaxcourt.gov. A petition without the required filing fee may not be processed.
Filing via DAWSON: Step-by-Step Electronic Filing and Confirmation
The U.S. Tax Court's electronic filing system is DAWSON (Docket Access Within a Secure Online Network); verify current DAWSON filing procedures at ustaxcourt.gov, as the system interface is subject to updates.
Create a DAWSON account
Practitioners (and taxpayers filing pro se) must create a DAWSON account at dawson.ustaxcourt.gov before they can file electronically. Account creation requires an email address and other identifying information. The account is the practitioner's permanent identifier in the DAWSON system; one account is used for all cases filed by that practitioner. Create the account well before the first filing deadline; do not wait until the day of the deadline to set up the account for the first time.
Upload the completed Form 2 and required attachments
The electronic filing process requires uploading the completed Form 2 petition (in PDF format) and a copy of the Notice of Deficiency (also in PDF format). The system will prompt for each required document. Verify the current DAWSON attachment requirements at ustaxcourt.gov before filing; attachment requirements and file size limits may be updated. The system will reject uploads that do not meet format requirements.
Pay the filing fee electronically
The filing fee is paid electronically through the DAWSON system during the petition filing process. Verify the current filing fee at ustaxcourt.gov. A petition for which the filing fee is not paid is not considered filed until the fee is received. The electronic payment is processed through a government payment processor; keep the payment confirmation as evidence of the filing fee payment.
Confirm the docket number and proof of filing
After a successfully filed petition, DAWSON assigns a docket number (formatted as NNNNN-YY, where NNNNN is the case number and YY is the year). The docket number is the case's permanent identifier in the Tax Court system. Save the DAWSON filing confirmation as proof of timely filing. The docket number is used in all subsequent filings and communications with the Tax Court and with IRS Counsel. Check the DAWSON docket after filing to confirm the petition appears as filed; a technical error during the filing process may prevent the petition from appearing even if the practitioner believes the filing was completed.
What Happens After Filing: Docketing, the IRS Answer, and the Pre-Trial Conference
After the petition is filed and docketed, the case enters the Tax Court's case management system. Understanding the procedural sequence that follows helps the practitioner plan for the case and avoid missing critical post-petition deadlines.
The IRS Answer
After the petition is served on the IRS, the IRS Chief Counsel's office has 60 days to file an Answer. The Answer admits or denies each allegation in the petition and may assert affirmative defenses. The IRS Counsel attorney who signs the Answer is typically the practitioner's primary point of contact for the IRS side of the case going forward. If the IRS does not timely file an Answer, the Tax Court may enter a default judgment against the IRS, though the IRS almost always timely answers. Review the Answer carefully when it arrives: any admission in the Answer narrows the issues in dispute.
The status conference and calendar call
The Tax Court schedules trial sessions periodically in cities around the country. A case is placed on a trial calendar for the city nearest the taxpayer's address. Before trial, the court holds a status conference (often by telephone) to assess whether the case is ready for trial or whether settlement discussions are ongoing. The status conference is also the time to raise any procedural issues (requesting additional discovery, motions to continue). At the calendar call (the first day of the trial session), cases that have not settled are called, and the parties report whether they are ready for trial.
The docketed Appeals conference
After the petition is filed, IRS Chief Counsel's office typically refers the case to IRS Appeals for a settlement conference. This docketed Appeals conference is separate from the pre-assessment Appeals conference that may have occurred before the Notice of Deficiency. The docketed conference is an opportunity to settle the case without trial. Most Tax Court cases settle before trial; the docketed Appeals conference is the primary mechanism for those settlements.
T.C. Summary Opinions: No Precedential Value and No Appeal Rights
When an S-case goes to trial, the Special Trial Judge issues a T.C. Summary Opinion. Understanding what T.C. Summary Opinions are and what they are not is essential for practitioners advising clients on the S-case election.
No precedential value
T.C. Summary Opinions are not published in the Tax Court Reports and have no precedential value. This means they cannot be cited as authority by or against any party in any other case, including the same parties in a different tax year. A T.C. Summary Opinion that rules in the taxpayer's favor on a particular deduction does not establish that the same deduction is allowable in a future year, nor does it bind the IRS in that future year. It is a final disposition of the specific case for the specific year, nothing more.
No appeal rights
A T.C. Summary Opinion cannot be appealed by either party. This cuts both ways: the taxpayer who receives an unfavorable Summary Opinion has no appellate remedy; the IRS who receives an unfavorable Summary Opinion also cannot appeal. The no-appeal provision was part of the congressional design of the S-case procedure: the simplified, fast, low-cost benefit is offset by the finality of the outcome. Practitioners must explain this tradeoff clearly to clients before any election is made.
IRS Concession Rate and Settlement Leverage: How a Filed Petition Changes the IRS Posture
A significant percentage of Tax Court cases settle before trial, often on terms more favorable to the taxpayer than the original examination result. Verify current IRS concession and settlement statistics in the most recent IRS Data Book at IRS.gov; rates vary by case type and year. Understanding why this happens helps the practitioner use the Tax Court petition as a strategic tool rather than just a procedural step.
Why Tax Court settlement rates are favorable
Several factors explain the high settlement rate in Tax Court: the docketed Appeals conference gives a fresh examiner (the Appeals officer) a second look at the case with IRS Counsel's involvement; Counsel attorneys regularly assess the specific trial risk for each issue (not just the technical legal position, but whether the evidence supports the IRS's position at trial); and the taxpayer's willingness to petition demonstrates a commitment to litigate that changes the IRS's cost-benefit calculation. Cases where the evidence is strong for the taxpayer, where the IRS's legal position has genuine hazards, or where the dollar amount does not justify IRS trial resources are the most likely to settle at favorable terms after petition.
Settlement leverage requires genuine trial readiness
The settlement leverage from a Tax Court petition only works when the IRS Counsel attorney believes the practitioner is genuinely prepared to try the case. An IRS Counsel attorney who concludes that the practitioner is using the petition as a bluff, without real litigation preparation, will not offer the same settlement terms as one who believes the case will go to trial. Settlement leverage requires genuine trial readiness: organized evidence, legal research on the key issues, witness preparation (if applicable), and the ability to respond substantively to Counsel's settlement proposals. Practitioners who are not prepared to litigate should not use the petition as a negotiating tool without understanding that the bluff may be called.
Trial Preparation If Settlement Fails: Stipulations and How Tax Court Trials Work
When a case does not settle, it proceeds to trial. Tax Court trials are bench trials (no jury). The judge decides both the factual and legal issues. Understanding the Tax Court trial process helps the practitioner prepare and manage client expectations.
The stipulation of facts
Before trial, the Tax Court Rules require the parties to prepare a stipulation of facts: a jointly agreed statement of the undisputed facts and documents. The stipulation narrows the issues for trial by establishing what is not disputed, so the trial can focus on the genuinely contested factual and legal issues. The IRS Counsel attorney and the practitioner negotiate the stipulation; it is submitted to the court before trial. Facts that cannot be stipulated are contested at trial through evidence and testimony. A well-negotiated stipulation can significantly reduce trial time and cost.
Evidence and testimony at trial
At trial, both parties present evidence (documents, records, testimony) and make legal arguments. The Tax Court applies the Federal Rules of Evidence with some flexibility, particularly in S-cases. The taxpayer generally has the burden of proof on factual issues (establishing that the claimed deductions were incurred and the claimed amounts are correct); the IRS has the burden on issues of fraud. Preparing the evidentiary record, including identifying witnesses, organizing documents, and anticipating the IRS's arguments, is a significant pre-trial undertaking. Practitioners who have not previously tried a Tax Court case should candidly evaluate whether the client would benefit from co-counsel with Tax Court trial experience.
Representing Clients in Tax Court: Who Can Appear and EA Admission
Not every practitioner who is authorized under Circular 230 to represent clients before the IRS is automatically authorized to appear in U.S. Tax Court. Tax Court has its own bar, and admission to that bar requires a separate process.
Attorneys admitted to the Tax Court bar
Attorneys who are members in good standing of the bar of any U.S. state, territory, or possession may apply for admission to the U.S. Tax Court bar. The application process requires submission of proof of bar membership, payment of an admission fee, and (in most cases) no further examination. Once admitted to the Tax Court bar, an attorney may appear in any Tax Court proceeding.
Enrolled agents and other non-attorney practitioners
Enrolled agents may apply for admission to the U.S. Tax Court bar. The process and requirements differ from IRS Circular 230 authorization and require a separate application to the Tax Court; verify current Tax Court admission requirements at ustaxcourt.gov. EA admission to the Tax Court bar requires a separate application and, for non-attorney practitioners, the passage of a Tax Court examination (a written examination on Tax Court practice and procedure). This is separate from the EA exam or AFSP requirements; it is a Tax Court-specific credentialing process. An enrolled agent who is admitted to the Tax Court bar has the same right to appear in Tax Court as an admitted attorney. An enrolled agent who is not admitted to the Tax Court bar cannot represent clients in Tax Court proceedings, even though they can represent the same clients before the IRS at every other stage of the examination and appeals process.
After Tax Court: Appellate Options from a Regular T.C. Opinion
When a regular Tax Court case (not an S-case) goes to trial and the Tax Court issues a T.C. Opinion (the regular opinion, as distinguished from a T.C. Summary Opinion in S-cases), either party may appeal the decision to the U.S. Court of Appeals for the circuit in which the taxpayer resides.
Appeals from regular T.C. Opinions
Regular T.C. Opinions (and T.C. Memo Opinions) are appealable to the appropriate U.S. Court of Appeals. The appeal is filed within 90 days of the decision becoming final (after the time for reconsideration has passed). The Court of Appeals reviews the Tax Court's factual findings under a clearly erroneous standard and reviews legal questions de novo. Tax Court decisions that involve substantial legal arguments are more likely to be worth appealing than those that turn primarily on factual credibility determinations, where the Court of Appeals is reluctant to substitute its judgment for the Tax Court's firsthand evaluation of the evidence.
S-case decisions cannot be appealed
T.C. Summary Opinions issued in S-cases cannot be appealed by either party. This is the permanent procedural consequence of the S-case election and is not waivable after the Summary Opinion issues. The no-appeal provision is the most important factor in the S-case election decision.
CHOOSING THE RIGHT PATH BEFORE THE PETITION IS FILED
The forum selection decision (Tax Court vs. refund court), the S-case vs. regular case election, and the litigation-vs.-settlement strategy should all be made before the petition is filed. Once the petition is filed as a regular case, converting it to an S-case (or vice versa) requires a motion and court approval. Once the 90-day window closes, the Tax Court option is gone. The pre-petition period is when the practitioner's strategic analysis has the most value for the client.
IMPORTANT: THIS GUIDE IS INFORMATIONAL, NOT LEGAL ADVICE
This guide is informational and does not constitute legal advice. Tax Court litigation involves complex procedural rules, evidence standards, and legal analysis that require case-specific professional judgment. The 90-day petition deadline is jurisdictional; missed deadlines cannot be remedied. Practitioners who have not previously handled a Tax Court case should consult with an attorney experienced in Tax Court practice before undertaking Tax Court representation for a client. All procedural information should be verified at ustaxcourt.gov before relying on it in any specific matter.
Regulated Claims and Verification Requirements
The following items in this guide are subject to Tax Court rule amendments, IRS guidance updates, or statutory changes: (1) EA Tax Court admission: enrolled agents may apply for admission to the U.S. Tax Court bar; the process and requirements differ from IRS Circular 230 authorization and require a separate application to the Tax Court; verify current Tax Court admission requirements at ustaxcourt.gov. (2) S-case cap: the Small Tax Case procedure under IRC 7463 is available when the amount in dispute is $50,000 or less per tax year at issue (not in aggregate across years); verify the current cap at ustaxcourt.gov. (3) IRS concession rate statistics: if citing any specific concession or settlement figure, verify current IRS concession and settlement statistics in the most recent IRS Data Book at IRS.gov; rates vary by case type and year. (4) DAWSON system: the U.S. Tax Court's electronic filing system is DAWSON (Docket Access Within a Secure Online Network); verify current DAWSON filing procedures at ustaxcourt.gov, as the system interface is subject to updates. (5) Filing fee: verify the current Tax Court filing fee at ustaxcourt.gov before filing. (6) IRS Answer deadline: verify the current IRS Answer deadline in the Tax Court Rules at ustaxcourt.gov.
Related Guides in the IRS Controversy Cluster
Tax Court is the downstream step from the IRS controversy process. These guides cover adjacent stages and issues:
- IRS Appeals Practitioner Protest Guide: Appeals is the step before Tax Court; a well-drafted formal protest creates the record that the Tax Court petition builds on
- IRS Collection Due Process (CDP) Hearing Guide: Tax Court also has jurisdiction over collection matters under IRC 6330, which is a separate jurisdictional basis from the deficiency petition track covered in this guide
- IRC 6330 and 6320: CDP Statutory Framework: the IRC 6330(d) Tax Court jurisdiction basis and standard of review that governs judicial review of CDP determinations
- IRS Audit Reconsideration Guide: an alternative to Tax Court for taxpayers whose examinations closed without a proper contest and where the assessment may be incorrect
- Professional Liability and E&O Insurance Guide: malpractice exposure when a Tax Court petition deadline is missed; coverage types that address this exposure
- IRC 7491 Burden of Proof in Tax Court Guide: burden of proof is a foundational Tax Court procedure topic, covering when the IRS bears the burden and how the credible evidence standard shifts it
- IRC 6707A Form 8886 Reportable Transactions Guide: reportable transaction disclosure issues and listed transaction penalties frequently arise in Tax Court proceedings
- IRC 6694 and 6695: Tax Preparer Penalties and Due Diligence -- Practitioner Guide: IRC 6694 unreasonable position and willful/reckless preparer penalties, IRC 6695 due diligence requirements, OBBBA exposure areas, and the practitioner defense checklist.
- IRC 6751(b) Supervisory Approval: Penalty Defense Guide: IRC 6751(b) supervisory approval requirements under TD 10017 (Dec 2024), transition zone rules, SBSE field directive, and practical defense strategies for Tax Court.
- IRC 6511 Refund Claims: SOL, Lookback, and Informal Claims: Filing windows, lookback rules, informal claim doctrine, and refund suit jurisdictional prerequisites.
- IRC 7430 Prevailing Party Attorney Fees: Recovering attorney fees and costs from the IRS after prevailing in Tax Court, including the qualified offer rule and the substantially justified defense.
- IRC 6213: Notice of Deficiency and the 90-Day Petition Deadline: The statutory notice that starts the Tax Court petition window and imposes the prohibited-assessment period.
- IRC 6404: IRS Interest Abatement: Tax Court review of interest abatement denials under IRC 6404(h) and the jurisdictional limits.
- IRC 7436: Tax Court Employment Tax Petition: the pre-payment Tax Court pathway for worker classification disputes, distinct from the IRC 6213 deficiency track covered in this guide
Frequently Asked Questions
What is the 90-day deadline and can it be extended?
The Notice of Deficiency gives the taxpayer 90 days from the mailing date of the notice (150 days if the taxpayer's address is outside the United States) to file a petition with the U.S. Tax Court. This deadline is jurisdictional: the Tax Court cannot accept a petition filed after the deadline, even for compelling circumstances or by mutual agreement. It cannot be extended. Calendar the deadline immediately when a client brings in a Notice of Deficiency, counting from the date on the notice face (not the date the client received it). Missing this deadline by even one day eliminates Tax Court jurisdiction.
What is the S-case procedure and when should a practitioner elect it?
The Small Tax Case procedure under IRC 7463 is available when the amount in dispute is $50,000 or less per tax year at issue (not in aggregate across years); verify the current cap at ustaxcourt.gov. S-cases are faster and less expensive than regular Tax Court cases, with simplified rules and a Special Trial Judge. The critical limitation is that T.C. Summary Opinions issued in S-cases cannot be appealed by either party. S-case procedure is appropriate when the case is below the cap, the issue is not novel, an adverse result does not warrant appeal, and the cost savings are significant relative to the amount at stake. If there is any realistic chance the taxpayer would want to appeal an unfavorable result, elect regular Tax Court procedure.
Can an enrolled agent represent a client in U.S. Tax Court?
Enrolled agents may apply for admission to the U.S. Tax Court bar. The process and requirements differ from IRS Circular 230 authorization and require a separate application to the Tax Court; verify current Tax Court admission requirements at ustaxcourt.gov. For non-attorney practitioners, the Tax Court requires passage of a written examination on Tax Court practice and procedure. An enrolled agent who is admitted to the Tax Court bar may represent clients in Tax Court. An enrolled agent who has not applied for and received Tax Court bar admission cannot appear in Tax Court on behalf of a client, even if fully authorized under Circular 230 for all other IRS representation.
What is DAWSON and how does electronic filing work?
DAWSON (Docket Access Within a Secure Online Network) is the U.S. Tax Court's electronic filing and case management system, accessible at dawson.ustaxcourt.gov. Verify current DAWSON filing procedures at ustaxcourt.gov, as the system interface is subject to updates. Practitioners create a DAWSON account, upload the completed Form 2 petition and the Notice of Deficiency in PDF format, and pay the filing fee electronically. The system assigns a docket number upon successful filing. Create a DAWSON account well before the first filing deadline; do not set up the account for the first time on the day of the deadline.
Does filing a Tax Court petition improve settlement prospects with the IRS?
Yes, in many cases. Filing a Tax Court petition changes the case dynamics: the case is docketed, assigned to an IRS Counsel attorney, and typically referred to IRS Appeals for a docketed settlement conference before trial. This docketed conference often produces more favorable settlement terms because the IRS has incurred costs and Counsel has assessed specific trial risk. Verify current IRS concession and settlement statistics in the most recent IRS Data Book at IRS.gov; rates vary by case type and year. However, the settlement leverage only works when the practitioner is genuinely prepared to litigate. Using the petition as a bluff without real trial preparation is a strategy experienced IRS Counsel attorneys can identify and will not reward with favorable settlements.