Tax Preparer Penalties for Understating Tax Liability

A paid preparer who understates a client’s tax liability faces personal penalties of $1,000 or 50% of the fee for the return when the position lacks substantial authority, and $5,000 or 75% of the fee when the understatement is willful or reckless. Those are the core tax preparer penalties for understating tax liability, and they sit alongside professional discipline, court injunctions, and, in the worst cases, criminal prosecution. The taxpayer still owes the missing tax; these penalties hit the preparer directly and separately.

The $1,000 or 50% Penalty for Unreasonable Positions

When a preparer takes a position on a return that lacks “substantial authority,” the IRS can impose a penalty of $1,000 or 50% of the fee earned for that return, whichever is greater.¹ The penalty applies when the preparer knew or reasonably should have known the position was not adequately supported. Substantial authority sits somewhere between a coin flip and a sure thing: the position needs meaningful backing in the tax code, regulations, or court decisions, not just a creative argument.

Two off-ramps exist. First, if the preparer discloses the questionable position on the return using Form 8275, the standard drops from substantial authority to “reasonable basis,” a lower bar met by any position a knowledgeable professional could support with a straight face, even if it probably wouldn’t survive an audit.² The disclosure exception does not apply to tax shelters or reportable transactions; those require substantial authority regardless.

Second, no penalty applies if the preparer shows reasonable cause and good faith. A preparer who reasonably interpreted an ambiguous regulation, relied on well-established precedent that was later overturned, or made a judgment call within professional norms can defeat this penalty.³

The $5,000 or 75% Penalty for Willful or Reckless Conduct

The fine jumps sharply when the understatement is intentional or reckless. Here, the penalty is $5,000 or 75% of the preparer’s fee for the return, whichever is greater.⁴ This targets preparers who fabricate deductions, inflate expenses without documentation, or deliberately misapply rules they clearly understand.

The line between this penalty and the unreasonable-position penalty is intent. An unreasonable position may reflect poor judgment. Willful or reckless conduct involves a conscious choice to bypass the law, or a disregard of the rules so extreme it amounts to the same thing. IRS investigators look for patterns: repeated identical errors across multiple clients, deductions that consistently lack supporting records, returns that are too uniformly favorable to be coincidental.

One practical rule prevents double-counting. If a preparer already paid the unreasonable-position penalty for a particular return and is then also found liable for the willful-conduct penalty on the same return, the higher penalty is reduced by whatever was paid under the lower one.³ The IRS does not stack both full penalties on the same filing.

Who These Penalties Apply To

Federal law defines a “tax return preparer” as anyone who prepares a federal tax return or refund claim for compensation, or who employs others to do so. Preparing even a substantial portion of a return is enough.⁵ CPAs, enrolled agents, attorneys, and unenrolled preparers all fall within the definition.

Some roles fall outside it, and the Section 6694 penalties do not reach them. Someone providing only typing or mechanical assistance is not a preparer. Employees preparing returns for their own employer are excluded, as are fiduciaries preparing returns for the people or entities they serve.⁵ Unpaid help for a friend or relative is likewise outside the scope.

Professional Discipline Under Circular 230

Statutory penalties are not the only exposure. Tax professionals who practice before the IRS are governed by Circular 230, and the IRS Office of Professional Responsibility has exclusive authority over disciplinary proceedings. The available sanctions escalate:⁶

Censure, a formal public reprimand that stays on the practitioner’s record.
Suspension from practice before the IRS for a set period.
Disbarment, a permanent prohibition on practicing before the IRS.
Monetary penalties up to the gross income earned from the conduct at issue, imposed in addition to or instead of the other sanctions.

Monetary penalties can also reach the practitioner’s employer or firm if the entity knew or should have known about the misconduct.⁶ Circular 230 also imposes due diligence duties that matter directly to understatement cases: preparers must take reasonable steps to verify information on returns and cannot ignore red flags. Willful blindness violates these standards just as active misconduct does.⁷

Court Injunctions and Criminal Charges

The most severe outcomes are court-ordered bans and criminal prosecution.

Injunctions

The IRS can ask a federal district court to prohibit specific misconduct or bar a person from preparing returns entirely. The court must find that the preparer engaged in conduct subject to penalties under the tax code, misrepresented credentials, guaranteed refunds, or committed other fraudulent conduct interfering with tax administration.⁸ A complete ban requires an additional finding that the preparer has “continually or repeatedly” engaged in the prohibited conduct and that a narrower injunction would not be enough. Violating an injunction brings contempt-of-court consequences on top of everything else.

Criminal Charges

Fraud or false statements in connection with a tax return is a felony carrying up to $100,000 in fines and three years in prison, with the fine ceiling rising to $500,000 for corporations.⁹ Preparing fraudulent documents is a misdemeanor carrying up to $10,000 in fines and one year of imprisonment. Improperly disclosing or misusing client information supplied for return preparation is a separate misdemeanor with up to $1,000 in fines and one year in prison.¹⁰

How the IRS Assesses the Penalty and How to Fight It

The IRS follows a structured process. It typically starts with Letter 1125, which describes the proposed penalty and explains the preparer’s appeal rights. A preparer who disagrees can request a conference with the IRS Independent Office of Appeals before assessment. This pre-assessment appeal right covers penalties under both Section 6694 and Section 6695.¹¹

If the preparer ignores Letter 1125 or loses the appeal, the IRS assesses the penalty and demands payment. Even then, the preparer can pay, file a refund claim, and, if that claim is denied, take the case to federal district court or the Court of Federal Claims.¹¹ Unpaid penalties can lead to federal tax liens on the preparer’s property. Multiple opportunities exist to contest an IRS finding, but ignoring the first letter forfeits the easiest of them.

1
Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer
2
eCFR. 26 CFR 1.6694-2 – Penalty for Understatement Due to an Unreasonable Position
3
Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer
4
Office of the Law Revision Counsel. 26 USC 6694 – Understatement of Taxpayers Liability by Tax Return Preparer – Section: Understatement Due to Willful or Reckless Conduct
5
Office of the Law Revision Counsel. 26 USC 7701 – Definitions
6
Internal Revenue Service. Regulations Governing Practice Before the Internal Revenue Service (Circular 230)
7
Internal Revenue Service. Diligence in Practice Before the IRS
8
Office of the Law Revision Counsel. 26 USC 7407 – Action to Enjoin Tax Return Preparers
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Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements
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Internal Revenue Service. Tax Preparer Penalties
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Internal Revenue Service. Internal Revenue Manual 8.11.3 – Return Preparer Penalty Cases