Apply Circular 230 Standards - CPA Reg

SECTION 1

Historical Context & Motivation

The federal income tax system depends on voluntary compliance, but that system only functions when taxpayers and, crucially, the professionals who advise them operate within clearly defined ethical boundaries. Treasury Department Circular 230 is the principal body of regulations that governs the conduct of practitioners who represent taxpayers before the Internal Revenue Service. Its origins trace back over a century, evolving in response to recurring abuses in tax practice and the growing complexity of the Internal Revenue Code. Understanding the historical trajectory of Circular 230 illuminates why these standards exist and why the CPA exam tests them so rigorously.

1884 • Horse Claims Act Origins

Congress first authorized the Treasury Department to regulate agents representing citizens before government agencies, initially targeting fraudulent claims related to Civil War property losses. This statute laid the statutory foundation for what would become Circular 230.

1921 • Early Tax Practice Regulation

With the expansion of the federal income tax after the Sixteenth Amendment (1913), Treasury formalized rules for enrolled agents and attorneys practicing before the Bureau of Internal Revenue, the predecessor to the IRS.

1966 • Modern Circular 230 Framework

The Treasury Department substantially revised Circular 230, establishing the structure of subparts (A through E) that remains recognizable today. The revision addressed duties, restrictions, and disciplinary proceedings for practitioners.

2004–2007 • Tax Shelter Reforms

In response to massive corporate tax shelter scandals, Treasury amended Circular 230 to add stringent requirements for written tax advice and covered opinions, dramatically raising the standard of care for practitioners.

2014 • Streamlined Standards for Written Advice

Treasury replaced the complex covered opinion and other written advice framework with a single, principles-based standard under §10.37, simplifying compliance while retaining the requirement of reasonable factual and legal bases for all written tax advice.

The central question Circular 230 addresses is straightforward but profound: What minimum standards of competence, diligence, and integrity must a tax practitioner meet when advising clients and interacting with the IRS? For CPA candidates, mastering these standards is not merely an academic exercise—it defines the professional obligations that will govern your career from the day you hold a license.

SECTION 2

Core Principles & Definitions

Circular 230 is organized into five subparts, each addressing a different dimension of practitioner regulation. Subpart A defines who may practice before the IRS and the categories of recognized practitioners. Subpart B establishes the duties and restrictions that constitute the behavioral core of the regulation. Subpart C outlines sanctions ranging from censure to disbarment. Subpart D governs disciplinary proceedings before the Office of Professional Responsibility (OPR), and Subpart E contains general provisions including definitions and effective dates. The following foundational ideas anchor the entire regulatory framework.

Who Is a "Practitioner"?

Circular 230 applies to attorneys, CPAs, enrolled agents, enrolled actuaries, enrolled retirement plan agents, and registered tax return preparers. Each category carries specific eligibility requirements and varying scopes of practice before the IRS.

Competence & Diligence (§10.22)

A practitioner must exercise due diligence in preparing, approving, and filing returns or other documents; determining the correctness of oral and written representations to the Treasury; and ascertaining the accuracy of information obtained from clients.

Standards for Tax Returns (§10.34)

A practitioner may not sign a return or advise a client to take a position on a return unless there is a reasonable basis for the position. If the position is a tax shelter item, the standard rises to a more-likely-than-not threshold of success on the merits.

Written Tax Advice (§10.37)

All written tax advice must be based on reasonable factual and legal assumptions, must reasonably consider all relevant facts the practitioner knows or should know, and must not take into account the likelihood of audit or the possibility of resolution through settlement.

Sanctions & Enforcement

The OPR can impose censure, suspension, or disbarment. Monetary penalties may also apply. Sanctions can be based on willful violations, recklessness, or gross incompetence—and the OPR actively pursues enforcement actions to protect the tax system.

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KEY TAKEAWAY

Think of Circular 230 as the "traffic code" for tax professionals navigating the IRS highway. Just as traffic laws set minimum standards for safe driving—speed limits, signaling requirements, lane discipline—Circular 230 sets minimum standards for competent, honest tax practice. You can always exceed the standard (drive more carefully), but falling below it triggers enforcement, just as running a red light triggers a citation. The OPR functions as the traffic patrol, with the authority to issue warnings (censure), suspend your license, or revoke it entirely (disbarment).

SECTION 3

Visual Explanation — Circular 230 Structure

This diagram maps the five subparts of Circular 230. Subpart B contains the duties and restrictions most heavily tested on the REG exam. The lower panel highlights the five most frequently tested provisions, each of which establishes a distinct standard of care.

As the diagram illustrates, the regulatory architecture separates the question of who may practice (Subpart A) from the substantive rules of conduct (Subpart B) and the enforcement mechanism (Subparts C and D). For REG exam purposes, Subpart B is the critical focus. Section 10.34 and Section 10.37 generate the majority of exam questions because they establish the minimum confidence thresholds a practitioner must satisfy before signing a return or providing written tax advice. Note that Section 10.33 (best practices) is aspirational—violations of best practices alone do not give rise to sanctions, a distinction the exam loves to test.

SECTION 4

How the Standards Work — Confidence Thresholds & Decision Logic

While Circular 230 is not a mathematical framework in the traditional sense, it relies on a hierarchy of confidence thresholds that practitioners must apply when evaluating the likelihood that a tax position will be sustained on its merits. These thresholds form a spectrum from least to most stringent, and knowing which threshold applies in a given context is essential for the REG exam and for professional practice.

The Tax Position Confidence Spectrum

Tax Position Confidence Thresholds

0% Confidence 100% Confidence

§10.34 minimum for non-shelter (20%)§10.34 minimum for tax shelters (55%)

Under Section 10.34, a practitioner may not sign a tax return or advise a client to take a position unless there is at least a reasonable basis for the position—generally interpreted as approximately a 20% likelihood of being sustained on the merits. For tax shelter or reportable transaction positions, the threshold escalates to more-likely-than-not, meaning greater than 50% probability. A practitioner must also advise the client of any relevant penalties and the opportunity to avoid them through adequate disclosure.

Section 10.37 — Written Tax Advice

Section 10.37 imposes a separate but complementary set of requirements on all written tax advice, whether delivered in a formal opinion letter or a casual email. The practitioner must base the advice on reasonable factual assumptions and reasonable legal assumptions, must reasonably consider all relevant facts that the practitioner knows or reasonably should know, and critically, must not take into account the possibility that a return will not be audited, that an issue will not be raised on audit, or that an issue will be resolved through settlement. This prohibition is designed to ensure that advice is based on the legal merits, not on the likelihood of detection.

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EXAM ALERT

A common REG trap question asks whether a practitioner may consider the audit likelihood when providing written advice. The answer is always no—under §10.37, the practitioner must evaluate positions solely on the legal and factual merits, regardless of the statistical probability that the IRS will examine the return.

SECTION 5

Detailed Breakdown — Duties, Restrictions & Prohibited Conduct

This flowchart traces a practitioner's decision path when a client presents a tax position. The branching point between reasonable basis (~20%) and more-likely-than-not (>50%) depends entirely on whether the position involves a tax shelter or reportable transaction.

Section	Duty / Restriction	Key Details
§10.20	Information to be furnished to IRS	Must promptly submit requested records/information, unless the practitioner believes in good faith that the information is privileged or the request is improper.
§10.21	Knowledge of client's omission	Must promptly advise the client of the noncompliance, error, or omission. Must advise of consequences. Not required to notify the IRS.
§10.27	Fees — no unconscionable fees	Contingent fees are generally prohibited for preparing original tax returns but may be charged for claims for refund filed solely in connection with IRS penalties or interest.
§10.28	Return of client records	Must return client records necessary for compliance regardless of fee disputes. State law may allow retention of practitioner work product.
§10.29	Conflicting interests	Must not represent conflicting interests unless all parties give informed, written consent and the practitioner reasonably believes competent representation is possible.
§10.35	Competence	Practitioners must possess the necessary competence to engage in practice before the IRS. Competence requires knowledge, skill, thoroughness, and preparation.
§10.36	Firm supervisory responsibilities	Practitioners with supervisory authority must ensure firm has adequate procedures for compliance. May be personally sanctioned for failing to take reasonable steps.

Key Subpart B Provisions — Duties & Restrictions

SECTION 6

Worked Example — Applying Circular 230 to a Client Scenario

Consider the following scenario: CPA Maria Chen is preparing the 2024 federal income tax return for her client, TechVenture LLC. During the engagement, she encounters three issues that require her to apply Circular 230 standards. Let us walk through her analysis step by step.

Multi-Issue Circular 230 Analysis — TechVenture LLC

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Step 1 — Identify the Issues

Issue A: TechVenture took a research and development credit for $120,000. Maria believes there is roughly a 25% chance the position would be sustained if challenged. Issue B: TechVenture participated in a listed transaction (a type of reportable transaction) and claims a $500,000 deduction. Maria estimates a 45% likelihood of success on the merits. Issue C: While reviewing prior-year records, Maria discovers that TechVenture failed to report $80,000 of income on its 2022 return.

Three distinct Circular 230 provisions apply: §10.34 (Issues A & B), §10.21 (Issue C).
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Step 2 — Analyze Issue A (R&D Credit — Non-Shelter Position)

The R&D credit is not a tax shelter item. Under §10.34, the minimum threshold for a non-shelter position is reasonable basis, which is generally interpreted as approximately 20% or greater likelihood of success. Maria's estimate of 25% exceeds this threshold. However, she must also advise TechVenture of any penalties that could apply if the position is disallowed and the opportunity to avoid penalties through adequate disclosure on the return (e.g., by filing Form 8275 or 8275-R).

Maria may sign the return with this position—25% > 20% reasonable basis threshold. She should advise on disclosure.
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Step 3 — Analyze Issue B (Listed Transaction — Tax Shelter Position)

A listed transaction is a type of tax shelter under Circular 230. For tax shelter positions, §10.34 requires a more-likely-than-not standard—greater than 50% likelihood of being sustained. Maria's estimate of 45% falls below this threshold. She may not sign the return or advise TechVenture to take this position. If TechVenture insists, Maria should consider withdrawing from the engagement.

Maria must NOT sign or advise this position—45% < 50% MLTN threshold for tax shelters.
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Step 4 — Analyze Issue C (Prior-Year Omission — §10.21)

Upon discovering the $80,000 omission on TechVenture's 2022 return, §10.21 requires Maria to promptly notify the client of the noncompliance and advise TechVenture of the consequences, including potential accuracy-related penalties and interest. Critically, §10.21 does not require Maria to notify the IRS—the duty runs to the client, not to the government. If TechVenture refuses to correct the error, Maria must consider whether she can continue the engagement consistent with her professional obligations.

Maria must advise TechVenture of the omission and its consequences. She must NOT notify the IRS directly.
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Step 5 — Document and Advise

If Maria provides any of this analysis in writing—whether in a formal opinion letter, a memo, or even an email—§10.37 requires that the advice be based on reasonable factual and legal assumptions, that she consider all relevant facts she knows or should know, and that she not factor in the likelihood that TechVenture's return will or will not be audited. Maria should document her analysis thoroughly to demonstrate compliance with all applicable Circular 230 standards.

All written advice must satisfy §10.37: merit-based analysis only, no audit-likelihood consideration.

SECTION 7

Sanctions Framework & Comparison with Other Standards

Understanding Circular 230 in isolation is insufficient; CPA candidates must also understand how its standards relate to the AICPA Statements on Standards for Tax Services (SSTSs) and the IRC penalty provisions under Sections 6694 and 6695. While these three frameworks overlap significantly, they differ in their enforcement mechanisms, the standards they impose, and the consequences of noncompliance. The table below highlights these distinctions.

Dimension	Circular 230	AICPA SSTSs	IRC §6694
Issuing Authority	U.S. Treasury Department	AICPA (professional body)	Congress (Internal Revenue Code)
Binding Force	Federal regulation; binding on all practitioners	Professional standards; binding on AICPA members	Federal statute; binding on all tax return preparers
Non-Shelter Standard	Reasonable basis (~20%)	Realistic possibility of success (~33%)	Substantial authority (~40%) to avoid penalty
Shelter Standard	More-likely-than-not (>50%)	More-likely-than-not (>50%)	More-likely-than-not (>50%)
Sanctions	Censure, suspension, disbarment, monetary penalties	Admonishment, suspension, expulsion from AICPA	Monetary penalty: greater of $1,000 or 50% of income from return (§6694(a)); greater of $5,000 or 75% for willful/reckless (§6694(b))
Enforcer	Office of Professional Responsibility (OPR)	AICPA Professional Ethics Division	IRS directly

Comparison of Practitioner Standards: Circular 230, AICPA SSTSs, and IRC §6694

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KEY TAKEAWAY

Think of these three frameworks as overlapping regulatory layers—like federal, state, and municipal regulations governing the same activity. A CPA who is an AICPA member and practices before the IRS is simultaneously subject to all three. The strictest applicable standard controls, much like the most restrictive zoning ordinance governs a property development even when broader codes are more permissive. On the REG exam, you must identify which standard applies to the specific facts presented, and when standards conflict, the most demanding requirement prevails.

SECTION 8

Connection to Advanced Theory — OPR Proceedings & Practitioner Liability

Circular 230's enforcement provisions in Subparts C and D connect directly to the broader landscape of practitioner liability and professional regulation. The Office of Professional Responsibility (OPR) has exclusive authority to institute disciplinary proceedings against practitioners. These proceedings can be triggered by incompetence, disreputable conduct, willful violations, or reckless disregard of Circular 230 provisions. The standards of proof and the procedural protections mirror administrative law principles, and understanding them provides a bridge to more advanced topics in tax procedure.

Concept	Circular 230 Application	Advanced / Related Doctrine
Willfulness	Willful violation of any Circular 230 provision may result in censure, suspension, or disbarment (§10.52)	Connects to IRC §7206 (fraud), §6694(b) (willful/reckless preparer penalties), and criminal prosecution standards
Incompetence & Disreputable Conduct	Defined in §10.51 — includes conviction of tax crimes, dishonesty, providing false opinions, and failure to file personal returns	Links to state CPA board disciplinary proceedings, AICPA ethics proceedings, and state bar actions for attorneys
Expedited Suspension	§10.82 allows immediate suspension when a practitioner has lost a professional license or been convicted of certain crimes	Parallels emergency license suspension mechanisms in securities regulation (SEC Rule 102(e)) and healthcare licensing
Tax Practitioner Privilege	IRC §7525 extends attorney-client-like privilege to federally authorized tax practitioners for tax advice	Does not apply in criminal proceedings or to written communications regarding tax shelters — a critical limitation tested on the REG exam

Circular 230 Connections to Advanced Legal Doctrines

Looking forward, practitioners must remain vigilant as the OPR continues to evolve its enforcement posture. Recent developments include increased scrutiny of return preparer conduct and the integration of data analytics to identify patterns of non-compliant practice. The intersection of Circular 230 with the IRC §7525 practitioner privilege is particularly nuanced: the privilege applies only to tax advice (not return preparation), only in non-criminal proceedings, and never to written communications regarding tax shelters. These advanced intersections illustrate that Circular 230 does not operate in a vacuum but forms one node in a complex web of professional accountability.

SECTION 9

Practice Problems

Question 1: CONCEPTUAL

Question 1 of 3 Under Circular 230, which of the following statements BEST describes the enforceability of §10.33 'best practices' compared to §10.34 'standards for tax returns'?(A) Both §10.33 and §10.34 are aspirational guidelines; the OPR cannot impose sanctions for violations of either provision. (B) Both §10.33 and §10.34 are mandatory; the OPR can impose sanctions for violations of both provisions under Subparts C and D. (C) Section 10.33 is aspirational and cannot alone support OPR sanctions, while §10.34 is mandatory and can support disciplinary action. (D) Section 10.33 is mandatory for CPAs only, while §10.34 is aspirational for all practitioners.

Show answer

Correct Answer: (C) Step 1 — Analyze §10.33. Section 10.33 governs 'best practices' for tax advisors. Throughout the provision, the regulation uses aspirational language — practitioners 'should' establish procedures, 'should' communicate clearly, and 'should' act fairly. This advisory language signals that §10.33 describes ideal conduct but does not impose enforceable obligations. The OPR cannot impose sanctions solely for failure to follow §10.33 best practices. Step 2 — Analyze §10.34. Section 10.34 governs standards for positions taken on tax returns and documents submitted to the IRS. Unlike §10.33, this provision uses mandatory language — a practitioner 'must not' sign a return that takes an unreasonable position, and 'must not' advise a client to take a position that lacks a reasonable basis. This mandatory language creates an enforceable duty subject to OPR disciplinary action under Subparts C and D. Step 3 — Eliminate the distractors. • (A) is incorrect because §10.34 IS mandatory and enforceable — the OPR regularly sanctions practitioners for §10.34 violations. • (B) is incorrect because §10.33 is NOT mandatory; treating it as mandatory is the classic exam trap. Both provisions are not equally enforceable. • (D) is incorrect because §10.33 is aspirational for ALL practitioners (CPAs, attorneys, enrolled agents alike), not mandatory for CPAs only. No such distinction exists in Circular 230. Step 4 — Confirm the correct answer. (C) correctly captures the aspirational-versus-mandatory distinction: §10.33 uses 'should' and cannot alone ground an OPR sanction; §10.34 uses 'must not' and can support disciplinary action. This distinction — aspirational vs. mandatory language — is a frequently tested nuance on the REG exam.Question 2 of 3 A practitioner prepares a tax return and charges the client a fee equal to 15% of any refund generated by the return. Under Circular 230, which of the following BEST describes whether this fee arrangement is permissible?(A) The arrangement is always prohibited because Circular 230 bans all contingent fees for any service rendered before the IRS. (B) The arrangement is permissible because §10.27 allows contingent fees for the preparation of original tax returns without restriction. (C) The arrangement is prohibited under §10.27 because contingent fees for preparation of original tax returns are not among the recognized exceptions, unless the return is filed in response to an IRS examination. (D) The arrangement is permissible only if the practitioner discloses the fee structure in writing and obtains the client's written consent before filing.Correct Answer: (C) Step 1 — State the general rule. Circular 230 §10.27 prohibits practitioners from charging contingent fees for services rendered in connection with any matter before the IRS, with limited exceptions. Step 2 — Identify the recognized exceptions to the contingent fee prohibition. Section 10.27(b) permits contingent fees in three narrow situations: (1) services rendered in connection with an IRS examination of, or challenge to, an original tax return; (2) services rendered in connection with a claim for refund filed solely in connection with the determination of statutory interest or penalties; and (3) services rendered in connection with any judicial proceeding arising under the Internal Revenue Code. Step 3 — Apply the rule to the facts. The practitioner is preparing an original tax return and charging a fee tied to the size of the refund. Preparation of an original tax return is NOT one of the three exceptions. Therefore, this contingent fee arrangement violates §10.27. Step 4 — Eliminate the distractors. • (A) is a trap — it overstates the rule. Circular 230 does NOT ban all contingent fees; the three exceptions listed above are expressly permitted. • (B) is incorrect and directly contradicts §10.27; original return preparation is not a permitted exception. • (D) is a fabricated rule. No written-disclosure-and-consent mechanism exists in §10.27 that converts an otherwise prohibited contingent fee into a permissible one. Conclusion: (C) is correct. Charging a contingent fee for preparation of an original return violates §10.27 because that service falls outside all recognized exceptions.Question 3 of 3 During an OPR investigation, a practitioner is asked why she recommended an aggressive tax position on a client's return. She claims the position was justified because it might reduce the likelihood that the IRS would select the return for audit. Under Circular 230, which of the following BEST evaluates her justification?(A) The justification is valid; practitioners are permitted to weigh audit likelihood when advising clients on return positions under §10.34. (B) The justification is invalid; §10.34 expressly prohibits recommending any position that could reduce audit likelihood, regardless of its legal merits. (C) The justification is invalid; under §10.34, a practitioner must not recommend a position or prepare a return that reflects a position primarily because it is unlikely to be audited — audit likelihood is not a permissible basis for a return position. (D) The justification is valid only if the position has at least a 20% chance of prevailing on the merits, because the realistic possibility standard allows audit-likelihood considerations.Correct Answer: (C) Step 1 — Identify the governing rule. Circular 230 §10.34(a) states that a practitioner must not recommend a position on a return, or prepare or sign a return, that reflects a position the practitioner knows (or should know) lacks a reasonable basis. More directly, §10.34(b) expressly states that a practitioner must not advise a client to take a position on a return — or prepare a return reflecting a position — if the practitioner is relying on the position primarily because it is unlikely to be challenged by the IRS (i.e., audit lottery reasoning). Step 2 — Apply the rule to the facts. The practitioner's stated rationale is that the position might reduce audit likelihood. This is precisely the 'audit lottery' reasoning that §10.34 forbids. A position must be supportable on its legal and factual merits — not on the probability that the IRS will never examine it. Step 3 — Eliminate the distractors. • (A) is the classic exam trap. Audit likelihood is explicitly NOT a permissible basis under §10.34 — the provision directly targets this reasoning. • (B) is an overstatement. Section 10.34 does not prohibit all positions that might reduce audit likelihood; it prohibits positions recommended or taken PRIMARILY because of audit likelihood with insufficient legal support. The word 'regardless of its legal merits' makes (B) overbroad and incorrect. • (D) fabricates a '20% standard' and incorrectly links the old realistic-possibility-of-success standard to audit-likelihood analysis. The realistic possibility standard (formerly 1-in-3 chance) applied to position strength, not audit risk, and has been superseded by the reasonable basis / substantial authority framework in any event. Conclusion: (C) correctly identifies that audit-lottery reasoning violates §10.34. The practitioner's justification is invalid and could expose her to OPR disciplinary action.

Question 2: BASIC CALCULATION

A CPA is preparing a client's tax return. The client wishes to claim a deduction for which the CPA estimates a 15% likelihood of being sustained on the merits. The deduction does not involve a tax shelter or reportable transaction. Under §10.34, may the CPA sign the return with this position? What is the minimum confidence threshold, and what should the CPA do?

Show answer

No, the CPA may not sign the return with this position. Under §10.34, the minimum threshold for a non-shelter tax position is "reasonable basis," which is generally interpreted as approximately 20% or greater likelihood of being sustained on the merits. A 15% likelihood falls below this threshold. The CPA should advise the client that the position does not meet the Circular 230 standard and cannot be included on the return as currently supported. The CPA should also discuss whether additional research or factual development might strengthen the position above the reasonable basis threshold, and should inform the client about potential penalties for taking unsupported positions.

Question 3: INTERMEDIATE

CPA Johnson discovers while preparing the 2024 return that his client, Beta Corp, failed to include $200,000 of rental income on its 2022 return. Johnson has advised Beta Corp of the error and the associated penalties and interest. Beta Corp's CEO instructs Johnson to "just focus on the 2024 return and ignore 2022." What are Johnson's obligations and options under Circular 230?

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Under §10.21, Johnson has already satisfied his primary obligation: promptly advising the client of the noncompliance, error, or omission and informing the client of the consequences of noncompliance (penalties, interest, potential criminal exposure for willful failure). Importantly, §10.21 does not require Johnson to notify the IRS—the duty runs exclusively to the client. However, Johnson now faces a professional judgment about whether to continue the engagement. He is not required to withdraw, but if continuing would cause him to violate other Circular 230 provisions—for example, if the 2022 error affects the accuracy of the 2024 return—he may need to withdraw. Additionally, Johnson cannot sign a 2024 return that he knows contains a material misstatement that flows from the uncorrected 2022 error. Johnson should document his advice to Beta Corp in writing to protect himself.

Question 4: APPLIED

CPA Sarah Lee is a tax partner at a mid-size firm. An associate in her group prepares a written tax opinion for a client recommending an aggressive strategy that would reduce the client's tax liability by $2 million. The opinion does not evaluate all relevant facts, assumes without analysis that certain transactions have economic substance, and includes a statement that "the IRS rarely audits transactions of this type, so the risk is minimal." Identify all Circular 230 violations present in this scenario.

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Multiple Circular 230 provisions are violated. First, the opinion violates §10.37 in at least three ways: (1) it fails to consider all relevant facts the practitioner knows or should know; (2) it relies on unreasonable assumptions (assuming economic substance without analysis); and (3) it impermissibly takes into account the likelihood that the return will not be audited, which §10.37 expressly prohibits. Second, the associate may have violated §10.35 (competence) if the associate lacked the knowledge and skill necessary to render the opinion. Third, Sarah Lee as the supervisory partner may face personal liability under §10.36, which requires practitioners with supervisory authority to take reasonable steps to ensure the firm has adequate procedures to comply with Circular 230. If she failed to review the opinion or lacked quality control procedures, she could be separately sanctioned. The OPR could pursue censure, suspension, or disbarment against both the associate and the partner.

Question 5: CRITICAL THINKING

Consider the policy rationale behind §10.37's prohibition against considering audit likelihood in written tax advice. Some practitioners argue this rule is unrealistic because audit probability is a material factor in a client's risk assessment. Others contend the rule is essential to maintaining the integrity of the self-assessment tax system. Evaluate both perspectives and explain how this rule connects to the broader purposes of Circular 230.

Show answer

The prohibition serves a critical structural function in preserving the integrity of the voluntary compliance system. Those who support the rule argue that if practitioners could advise clients based on audit probability rather than legal merit, the quality of tax compliance would degrade to a game of statistical arbitrage—positions would be taken not because they are legally supportable but because they are unlikely to be detected. This would undermine the self-assessment model on which the entire federal tax system depends. Those who criticize the rule note that in every other area of legal practice, litigation risk (analogous to audit risk) is a legitimate factor in advising clients, and that sophisticated clients will conduct their own audit-probability analysis regardless of what the practitioner says. The resolution lies in understanding Circular 230's purpose: it governs the practitioner's professional conduct, not the client's decision-making. The client may consider audit likelihood, but the practitioner's written advice must be grounded in merit. This ensures that the professional community maintains a merit-based floor below which advice cannot fall, even if individual clients make risk-based decisions. The rule thus connects to the core Circular 230 principle that practitioners serve a quasi-public function in the tax system—they are not merely advocates for their clients but also participants in the administration of tax law.

SUMMARY

Summary — Apply Circular 230 Standards

Summary

Circular 230 (31 C.F.R. Part 10) is the Treasury Department's regulatory framework governing the conduct of practitioners—including CPAs, attorneys, and enrolled agents—who represent taxpayers before the IRS. Its five subparts establish who may practice (Subpart A), the duties and restrictions that form the behavioral core of the regulation (Subpart B), available sanctions (Subpart C), disciplinary proceedings (Subpart D), and general provisions (Subpart E). For REG exam purposes, the critical provisions are §10.21 (advise client of omissions—not the IRS), §10.34 (return positions require reasonable basis ~20% for non-shelters or more-likely-than-not >50% for tax shelters), and §10.37 (written tax advice must be merit-based and must never factor in audit likelihood).

Remember that §10.33 best practices are aspirational and not independently sanctionable, while contingent fees are generally prohibited for original return preparation under §10.27. The OPR enforces these standards through censure, suspension, or disbarment, and practitioners must always apply the most stringent applicable standard when Circular 230, AICPA SSTSs, and IRC penalty provisions overlap.