Discovering a client return error is not only a technical tax problem. It is also a Circular 230 problem. The EA needs to know what must be communicated, what the client controls, and when continuing the engagement would make the practitioner part of a known incorrect position.
The core exam rule is steady: if a practitioner knows that a client has not complied with the revenue laws, or has made an error or omission in a return or other document, the practitioner must promptly advise the client of the noncompliance, error, or omission and the potential consequences. The practitioner does not physically force the client to amend, but the practitioner also cannot prepare a later return using facts the practitioner knows are wrong.
The Decision Map
The EA's Minimum Duty After Discovering an Error
Circular 230 section 10.21 is the anchor. Once the practitioner knows of a client's error, omission, or noncompliance, the practitioner must promptly advise the client and tell the client about potential consequences.
This duty is not limited to returns the practitioner prepared. It can apply to a prior self-prepared return, a return prepared by another firm, or a return the practitioner prepared last year. The key trigger is knowledge of the error or omission.
The communication should be specific enough to be useful:
- what item appears incorrect;
- what facts changed or were discovered;
- which return years or forms may be affected;
- whether tax, penalty, interest, basis, credit, or carryforward amounts may change;
- what correction path is available if the client authorizes it.
The Client Controls Whether to Amend
An EA can recommend an amended return, but the client decides whether to authorize it. If the client refuses, the EA should not secretly file a correction or disclose the matter without authority unless a specific law or engagement term requires disclosure.
For exam purposes, separate these ideas:
- Duty to advise: yes.
- Duty to explain consequences: yes.
- Duty to force the client to amend: no.
- Permission to prepare a known wrong future return: no.
That last line is where many exam questions live.
When a Prior Error Affects the Current Return
Some prior-year errors stay isolated. Others roll forward. Basis, depreciation, passive activity losses, capital loss carryforwards, credits, and retirement-account basis can affect later returns.
Assume Riverbend Tax prepared a 2025 return for a client who reported a nondeductible IRA contribution. In 2026, the client discloses a large traditional IRA balance that existed in 2025 and changes the taxable portion of a Roth conversion. The EA tells the client that the 2025 Form 8606 and 2025 income may be wrong. The client refuses to amend.
The EA still has a current-year problem. If 2026 reporting depends on correct IRA basis and prior-year conversion treatment, the EA cannot simply carry forward numbers the EA knows are wrong. The choices are to obtain corrected information, prepare a return using a supportable position, limit or end the engagement, or decline to prepare the affected forms.
Documentation Protects the Analysis
Good documentation is not theater. It shows that the practitioner acted promptly, explained the issue, and did not ignore a known incorrect position.
The file should usually include:
- the fact pattern discovered;
- records reviewed;
- the practitioner's technical conclusion or uncertainty;
- the client communication;
- correction options discussed;
- the client's decision;
- the effect on current or future return preparation;
- the practitioner's decision to continue, limit, or withdraw.
Avoid vague notes such as "client knows." Better documentation says what the client was told and why it matters.
New Client Versus Existing Client
The same Circular 230 logic applies whether the error was on a return prepared by someone else or on a return the EA prepared. The practical difference is risk and current-year effect.
For a new client, the EA may advise correction and decide whether the prior error affects the engagement. For an existing client, the EA may also need to evaluate whether the prior workpapers, client questionnaire, or communication process missed a material fact. Either way, the EA should not let embarrassment or client pressure turn into current-year inaccuracy.
Exam Framing
EA exam questions often present a client who says, "I do not want to amend." That fact does not erase the practitioner's duty. The correct answer usually sounds like this:
- inform the client promptly;
- explain the potential consequences;
- recommend correction when appropriate;
- document the discussion;
- do not prepare a return or claim using a position the practitioner knows lacks support;
- consider withdrawal if the client insists on an incorrect current or future position.
The distractor answer is usually extreme: either "force the client to amend" or "ignore the prior year because the client refused." Both miss the middle path Circular 230 requires.