CPA Exam Federal Tax Procedures and Ethics
Last updated: May 2, 2026
Federal Tax Procedures and Ethics questions are one of the highest-leverage areas to study for the CPA Exam. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
Federal tax procedure governs how the IRS assesses, collects, examines, and litigates tax liabilities, while ethics rules under Treasury Circular 230 and IRC §§6694, 6695, 6713, and 7216 regulate the conduct of paid preparers and practitioners. A preparer faces a §6694(a) penalty (greater of $1,000 or 50% of fee income) for an unreasonable position lacking substantial authority that is not disclosed, and a §6694(b) penalty (greater of $5,000 or 75% of fee income) for willful or reckless conduct. Practitioners must comply with Circular 230 §10.21 (known-error notification), §10.22 (due diligence), §10.34 (standards for tax returns), and §10.37 (written advice). The IRS examination/appeals pipeline runs from exam → 30-day letter → Appeals → 90-day statutory notice of deficiency → Tax Court (prepayment) or refund suit in District Court/Court of Federal Claims (post-payment).
Elements breakdown
Preparer Position Standards (IRC §6694)
The minimum confidence level a preparer must have in a return position to avoid penalty.
- Undisclosed position requires substantial authority
- Disclosed position requires reasonable basis
- Tax shelter/reportable transaction requires more-likely-than-not
- Willful or reckless conduct triggers §6694(b)
- Reasonable cause and good faith is a defense
Circular 230 Practitioner Duties
Treasury rules of practice for CPAs, attorneys, and enrolled agents representing taxpayers before the IRS.
- §10.21 — promptly inform client of any noncompliance, error, or omission
- §10.22 — exercise due diligence in preparing returns and oral/written advice
- §10.27 — limits on contingent fees (generally prohibited except in narrow cases)
- §10.29 — conflicts of interest require informed written consent
- §10.33 — best practices for tax advisors
- §10.34 — cannot sign return with unreasonable position
- §10.37 — written advice must consider all relevant facts and law
- §10.50–10.52 — sanctions: censure, suspension, disbarment, monetary penalty
Common examples:
- Discovering a prior-year omitted Schedule B foreign account triggers §10.21 notification — but the practitioner does NOT have to amend without client consent.
Other Preparer Penalties
Targeted penalties beyond §6694 for specific preparer misconduct.
- §6695(a) — failure to furnish copy of return to taxpayer
- §6695(b) — failure to sign return
- §6695(c) — failure to furnish PTIN
- §6695(g) — failure of due diligence on EITC, CTC, AOTC, head-of-household
- §6713 — disclosure or use of return information ($250 per disclosure)
- §7216 — criminal version of §6713 (misdemeanor, up to $1,000 and/or 1 year)
- §6701 — aiding and abetting understatement
IRS Examination & Appeals Pipeline
The procedural sequence by which a tax controversy moves from audit through litigation.
- Exam issues 30-day letter with Revenue Agent's Report (RAR)
- Taxpayer protests to IRS Independent Office of Appeals within 30 days
- Appeals weighs hazards of litigation; settles based on probability
- If no agreement, IRS issues 90-day Statutory Notice of Deficiency (SNOD)
- Within 90 days: petition Tax Court (no prepayment required)
- After paying: file refund claim, then sue in District Court or Court of Federal Claims
- Statute of limitations: 3 years (general), 6 years (>25% omission), unlimited (fraud/no return)
Taxpayer Penalties Relevant to Preparer Advice
Penalties on the taxpayer that the preparer must advise about and may share liability for.
- §6662 accuracy-related penalty (20%) — negligence, substantial understatement, valuation misstatement
- §6663 civil fraud penalty (75%)
- §6651 failure to file/pay
- Substantial understatement threshold: greater of 10% of tax or $5,000 (individuals)
- Disclosure on Form 8275 reduces understatement penalty if reasonable basis exists
Common patterns and traps
The Reasonable-Basis-Without-Disclosure Trap
Wrong answers will tell you the preparer is safe because the position has 'reasonable basis' even though it was not disclosed on Form 8275. Reasonable basis (~20%) only protects the preparer when the position is DISCLOSED. Without disclosure, the preparer needs substantial authority (~40%) to avoid §6694(a). Test-writers love this because both terms sound similarly defensible to a casual reader.
A choice that says the preparer faces no §6694 penalty because the position had a 'reasonable basis' even though Form 8275 was not filed.
The Tax-Court-Without-90-Day-Letter Trap
Distractors will offer Tax Court as a forum even when the fact pattern has the taxpayer paying the deficiency first, or skipping the SNOD. Tax Court jurisdiction is anchored to a timely petition filed within 90 days of a Statutory Notice of Deficiency. If the taxpayer pays, Tax Court is generally unavailable, and the path is District Court or the Court of Federal Claims via a refund claim.
A choice naming Tax Court as the proper forum when the scenario states the taxpayer has already paid the assessment in full and filed Form 1040X.
The §10.21 Mandatory-Amendment Trap
Wrong answers overstate the practitioner's duty when a prior-year error is discovered. Circular 230 §10.21 requires the practitioner to ADVISE the client of the noncompliance and its consequences — but it does NOT require the practitioner to amend the return without client consent or to inform the IRS. Test-takers who confuse 'inform' with 'correct' will pick the trap.
A choice stating the CPA must file an amended return immediately upon discovering a prior-year omission, regardless of client consent.
The Contingent-Fee-Always-Allowed Trap
Choices will assert a CPA can charge a contingent fee for any tax engagement. Circular 230 §10.27 generally PROHIBITS contingent fees, with narrow exceptions: services in connection with an IRS examination/challenge to an original or amended return, claims for refund of interest/penalties, and judicial proceedings. Original-return preparation for a contingent fee is barred.
A choice approving a contingent fee arrangement for preparing the client's original Form 1040 based on refund size.
The Statute-of-Limitations Misread
Distractors swap the 3-year general statute, the 6-year substantial-omission statute (>25% gross income omitted), and the unlimited fraud/no-return statute. The substantial omission must exceed 25% of gross income reported, not 25% of tax. False return or no return at all means the statute never starts.
A choice applying the 6-year statute when the omission is 18% of gross income, or applying the 3-year statute when no return was filed.
How it works
Picture this fact pattern: your client, Marisol, brings you a Schedule C with an aggressive home-office deduction. You research and conclude the position has roughly a 35% chance of being sustained — that's reasonable basis but not substantial authority (which the IRS treats as roughly 40%). Under §6694(a), if you sign the return without disclosure, you risk the preparer penalty because substantial authority is missing. The fix is Form 8275 disclosure, which drops the standard to reasonable basis and protects you (and reduces the client's §6662 exposure). Now suppose two years later Marisol gets a 30-day letter proposing to disallow the deduction. She protests, Appeals settles partway, and on the unagreed portion the IRS issues a 90-day SNOD. Marisol must petition Tax Court within 90 days to litigate without paying — miss that window and her only path is to pay, claim a refund, and sue in District Court. Throughout, Circular 230 §10.21 obligates you to tell her about any new errors you spot in the prior return, even though you cannot amend it without her permission.
Worked examples
Under IRC §6694, what is the most likely outcome regarding a preparer penalty against Devraj?
- A No penalty applies because the position had a reasonable basis.
- B A §6694(a) penalty applies, equal to the greater of $1,000 or 50% of the fee income from the return. ✓ Correct
- C A §6694(b) willful-or-reckless penalty applies, equal to the greater of $5,000 or 75% of the fee income.
- D No penalty applies because the understatement is below the §6662 substantial-understatement threshold for the taxpayer.
Why B is correct: Under IRC §6694(a), an undisclosed return position must be supported by substantial authority (roughly 40% likelihood). A reasonable-basis position (~20-30%) only avoids the penalty if disclosed on Form 8275. Because Devraj's position was undisclosed and below substantial authority, the §6694(a) penalty applies — the greater of $1,000 or 50% of fee income ($900), so $1,000.
Why each wrong choice fails:
- A: Reasonable basis only shields the preparer when the position is DISCLOSED on Form 8275. Without disclosure, substantial authority is required. (The Reasonable-Basis-Without-Disclosure Trap)
- C: §6694(b) requires willful or reckless conduct. Devraj researched the position and reached a good-faith (if optimistic) conclusion; the facts do not show recklessness.
- D: Preparer penalties under §6694 turn on the preparer's position standard, not the taxpayer's §6662 understatement threshold. The two regimes operate independently.
Which of the following is Renata's most appropriate procedural recommendation?
- A Pay the full $215,000 deficiency, file a refund claim, and sue in U.S. District Court within two years of denial.
- B File a protest with the IRS Independent Office of Appeals within 30 days of the Statutory Notice of Deficiency.
- C File a petition in the U.S. Tax Court within 90 days of the Statutory Notice of Deficiency, without prepaying the deficiency. ✓ Correct
- D File a petition in the U.S. Court of Federal Claims within 90 days of the Statutory Notice of Deficiency, without prepaying the deficiency.
Why C is correct: The U.S. Tax Court is the only prepayment forum in federal tax controversy. A timely petition filed within 90 days of the SNOD invokes Tax Court jurisdiction without requiring payment. Because Liu wants to avoid prepayment and has 87 days left, filing a Tax Court petition is the correct path. Appeals is no longer available as of right once the SNOD has been issued (though docketed-case Appeals consideration may follow).
Why each wrong choice fails:
- A: District Court is a refund forum requiring full prepayment under the Flora rule. While procedurally valid, it is not the most appropriate recommendation given Liu's explicit cash-flow constraint.
- B: The 30-day letter and Appeals protest precede the SNOD. Once the SNOD is issued, the procedural opportunity is the 90-day Tax Court petition, not a fresh Appeals protest.
- D: The Court of Federal Claims, like District Court, is a refund forum requiring full prepayment. It does not have prepayment jurisdiction over a SNOD. (The Tax-Court-Without-90-Day-Letter Trap)
Under Circular 230 §10.21, what is Yusra's required course of action?
- A Yusra must immediately file an amended Year 2 return on Tomasz's behalf to correct the omission.
- B Yusra must promptly notify Tomasz of the omission and the consequences of noncompliance, but is not required to amend the return without his consent. ✓ Correct
- C Yusra must report the omission to the IRS under the practitioner's duty of candor toward the tribunal.
- D Yusra has no duty regarding the Year 2 return because it was filed in a prior engagement period and the error is not material to Year 4.
Why B is correct: Circular 230 §10.21 requires a practitioner who knows of a client's noncompliance, error, or omission on any return to promptly advise the client of the noncompliance and the consequences under the Code and regulations. The rule does NOT require the practitioner to file an amended return without consent, nor to disclose the error to the IRS. Confidentiality obligations under §7216 and state law also restrict unauthorized disclosure to the IRS.
Why each wrong choice fails:
- A: §10.21 requires notification, not unilateral correction. A practitioner generally cannot file an amended return without client authorization; doing so would itself raise ethical and authorization issues. (The §10.21 Mandatory-Amendment Trap)
- C: There is no Circular 230 duty to disclose a client's prior noncompliance to the IRS in this context. Tax practice differs from a 'duty of candor toward the tribunal' that applies to attorneys in litigation under different rules.
- D: §10.21 applies whenever the practitioner discovers the error, regardless of which engagement period uncovered it. Materiality to the current year is not the test.
Memory aid
Pipeline mnemonic '30-Appeals-90-Tax': 30-day letter → Appeals → 90-day SNOD → Tax Court. Preparer standard ladder 'RDS-MLN': Reasonable basis (Disclosed), Substantial authority (undisclosed), More-Likely-than-Not (tax shelter).
Key distinction
Tax Court is the ONLY prepayment forum — every other refund forum (District Court, Court of Federal Claims) requires the taxpayer to pay the full deficiency first and then sue for refund. Confusing this is a frequent REG miss.
Summary
Preparer ethics under Circular 230 and §6694 hinge on the position-confidence ladder (reasonable basis with disclosure, substantial authority without, MLTN for shelters), and tax procedure follows a fixed 30-day → Appeals → 90-day → Tax Court pipeline that hard-gates the prepayment forum.
Practice federal tax procedures and ethics adaptively
Reading the rule is the start. Working CPA Exam-format questions on this sub-topic with adaptive selection, watching your mastery score climb in real time, and seeing the items you missed return on a spaced-repetition schedule — that's where score lift actually happens. Free for seven days. No credit card required.
Start your free 7-day trialFrequently asked questions
What is federal tax procedures and ethics on the CPA Exam?
Federal tax procedure governs how the IRS assesses, collects, examines, and litigates tax liabilities, while ethics rules under Treasury Circular 230 and IRC §§6694, 6695, 6713, and 7216 regulate the conduct of paid preparers and practitioners. A preparer faces a §6694(a) penalty (greater of $1,000 or 50% of fee income) for an unreasonable position lacking substantial authority that is not disclosed, and a §6694(b) penalty (greater of $5,000 or 75% of fee income) for willful or reckless conduct. Practitioners must comply with Circular 230 §10.21 (known-error notification), §10.22 (due diligence), §10.34 (standards for tax returns), and §10.37 (written advice). The IRS examination/appeals pipeline runs from exam → 30-day letter → Appeals → 90-day statutory notice of deficiency → Tax Court (prepayment) or refund suit in District Court/Court of Federal Claims (post-payment).
How do I practice federal tax procedures and ethics questions?
The fastest way to improve on federal tax procedures and ethics is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the CPA Exam; start a free 7-day trial to see your sub-topic mastery climb in real time.
What's the most important distinction to remember for federal tax procedures and ethics?
Tax Court is the ONLY prepayment forum — every other refund forum (District Court, Court of Federal Claims) requires the taxpayer to pay the full deficiency first and then sue for refund. Confusing this is a frequent REG miss.
Is there a memory aid for federal tax procedures and ethics questions?
Pipeline mnemonic '30-Appeals-90-Tax': 30-day letter → Appeals → 90-day SNOD → Tax Court. Preparer standard ladder 'RDS-MLN': Reasonable basis (Disclosed), Substantial authority (undisclosed), More-Likely-than-Not (tax shelter).
What's a common trap on federal tax procedures and ethics questions?
Confusing the §6694(a) substantial-authority threshold with the §6662 taxpayer thresholds
What's a common trap on federal tax procedures and ethics questions?
Missing the 90-day Tax Court window and assuming you can still litigate prepayment
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