Key Takeaways

  • Circular 230 establishes rules of conduct for practitioners before the IRS.
  • Key duties: competence, diligence, prompt return of client records.
  • Must advise clients of errors/omissions discovered on prior returns.
  • Contingent fees are generally prohibited for original/amended returns.
  • Due diligence includes technological competency.
  • Covered in detail in Chapter 25.
Last updated: January 2026

Circular 230 Overview

Why This Matters for the Exam

Circular 230 is the rulebook for practitioner conduct. This section provides an overview—Chapter 25 covers these topics in detail. The exam heavily tests Circular 230 requirements.

Expect at least 3-4 questions on Circular 230 basics.

What Is Circular 230?

Treasury Department Circular 230 (31 CFR Part 10) is the federal regulation governing practice before the IRS.

Circular 230 ComponentDescription
Subpart ARules for practice
Subpart BDuties and restrictions
Subpart CSanctions
Subpart DOPR proceedings
Subpart EGeneral provisions

Key Duties Under Circular 230

DutyDescription
CompetenceMust have knowledge and skill for the matter
Due diligenceExercise reasonable care in all matters
Prompt return of recordsReturn client records upon request
Advise of errorsInform client of errors on prior returns
Avoid conflictsManage conflicts of interest properly

Key Prohibitions Under Circular 230

ProhibitionDescription
Contingent fees for returnsCannot charge based on refund amount
Negotiating client refund checksCannot cash client's refund
False/misleading statementsCannot lie to IRS or clients
Frivolous positionsCannot take positions with no legal basis
Willful tax noncomplianceMust file and pay own taxes

Contingent Fees: The Key Rule

Contingent FeesAllowed?
Original returns❌ No
Amended returns❌ No
Refund claims❌ No (with limited exceptions)
Audit representation✅ Yes
Appeals representation✅ Yes
Court proceedings✅ Yes

Due Diligence Components

ComponentRequirement
AccuracyTake reasonable steps to ensure correctness
InquiryAsk questions when things seem wrong
RelianceCan rely on client info in good faith
TechnologyMaintain competency with technology

Client Error Discovery

When you discover an error on a client's prior return:

Required ActionNot Required
Advise client of the errorNotify the IRS
Explain the consequencesFile amended return without consent
Explain how to correctTerminate engagement immediately

Covered in Detail: Chapter 25

This overview introduces Circular 230. Chapter 25 covers:

  • Due diligence requirements (Section 10.22)
  • Knowledge of client's omission (Section 10.21)
  • Conflict of interest rules (Section 10.29)
  • Fee requirements (Section 10.27)
  • Advertising and solicitation (Section 10.30)
  • Tax return position standards (Section 10.34)
  • Written advice standards (Section 10.37)
  • Sanctions and penalties (Sections 10.50-10.53)

Real-World Scenario

Scenario: A client asks you to prepare their return for "$100 plus 10% of any refund over $1,000."

  • Allowed? No—this is a contingent fee for an original return, which is prohibited.
  • Alternative: Charge a flat fee or hourly rate.
  • If you charge contingent fee: Disreputable conduct under Circular 230.

On the Exam

Expect 3-4 questions on Circular 230 basics, typically:

  1. Prohibition Questions: "Which fee arrangement is prohibited?"
  2. Duty Questions: "What must a practitioner do upon discovering an error?"
  3. Scope Questions: "What does Circular 230 govern?"

The key is to remember: Circular 230 = practitioner rules. No contingent fees for returns. Advise client of errors. Due diligence required.

Test Your Knowledge

Which of the following is prohibited under Circular 230?

A
B
C
D
Test Your Knowledge

What must a practitioner do upon discovering an error on a client's prior return?

A
B
C
D
Test Your Knowledge

For which activity ARE contingent fees allowed?

A
B
C
D