Client errors, refusals, and the ethics of walking away

You've probably been there: A client brings in a half-finished return with numbers that don't add up, refuses to provide documentation for the refundable credit, or asks you to "just round it off." Situations like these put your ethics and credentials on the line. While your first instinct may be to help, tax professionals must recognize when helping crosses into enabling noncompliance.

Understand your due diligence duties

Section 10.22 of Circular 230 requires you to exercise due diligence in:

• Preparing or assisting with tax returns
• Determining the correctness of oral and written representations
• Complying with the Internal Revenue Code and practice standards

You’re not required to audit your clients, but you are needed legally to exercise due diligence under Circular 230 and §6695(g). This means verifying that client information is reasonable and supported by documentation. For items like the earned income tax credit (EITC), head of household (HOH) status or business expenses, you cannot simply take a client’s word without further proof.

When the numbers don't make sense

Let's say Parisa reports $41,000 in Schedule C income and $38,500 in expenses with no supporting documentation. You ask follow-up questions, but the answers are vague. You explain that you need receipts, bank statements or a mileage log.

Parisa responds, "My last guy never asked for that."

At this point, you must choose between maintaining compliance and keeping the client. If you proceed without documentation, you risk a §6695(g) due diligence penalty and possible client audit exposure. If you decline to prepare the return, you preserve your ethics and your license.

Tip: Practitioners cannot prepare a return with unsubstantiated or questionable information if the client refuses to provide documentation. 

What to do when a client refuses to amend

Sometimes, the issue isn't the current year's return; it's the client's mistake in a prior year. You point it out, explain the options, and recommend an amended return. The client, Bryan, says, "Let's just fix it going forward. I don't want to draw attention."

You cannot force Bryan to amend. However, you can and should document the conversation. 

If the error affects carry-forward items or credits in the current year, you may be unable to prepare this year’s return accurately without resolving the prior issue. If this is the case, you may need to disengage.

A preparer cannot knowingly sign a return containing false or misleading information, even if the client insists. Under §6695(g), failing to meet due diligence requirements for credits and HOH status can trigger a penalty of $500 per failure (inflation-adjusted for 2025), which includes making reasonable inquiries and completing Form 8867, Paid Preparer’s Due Diligence Checklist.

Protect yourself with a process

When clients push back, defer to your written policies. These should include:

• A clear due diligence checklist for every return
• A standard procedure for requesting documentation
• A policy for refusing engagements that lack sufficient facts
• A disengagement template to use when walking away

This makes explaining your position easier and keeping client interactions professional, not personal.

Try language like:

"I'd love to help, but the IRS requires certain documentation standards before I can sign your return. If we can't complete those steps, I unfortunately won't be able to move forward."

This shifts the pressure off you and back to the process.

Know when to cut ties

The decision to disengage can be difficult, especially with long-time clients. But protecting your electronic filing identification number (EFIN), preparer tax identification number (PTIN), and professional standing must come first.

Disengage if:

• The client refuses to provide the records needed.
• They ask you to enter false information knowingly.
• They become aggressive or threaten to "go elsewhere" unless you comply.
• The situation makes you uncomfortable or puts your ethics in doubt.

Use a formal disengagement letter or email that:

• States the reason for withdrawal
• Summarizes what work, if any, was completed
• Clarifies what documents you will return or retain
• Suggests the client seek another qualified professional

Example: When disengagement is the right call

Your new client, Celine, comes in with a prior year's return showing HOH filing status with two dependent children. You ask for school records and residency proof. Celine pushes back, saying it's not your business.

You explain the due diligence standards and Form 8867 requirements. They say, "I can find someone else who won't make this so complicated."

At this point, the decision is simple: document the exchange, disengage and move on. The risk to your practice is too high to justify compromise.

Strong ethics, strong practice

Clients may not like the rules, but they'll respect consistency. By adhering to clear policies, asking for documentation every time, and disengaging when needed, you send the message that your standards don't bend.

In the long run, you'll attract better clients, reduce audit exposure and strengthen your reputation as a trustworthy professional.