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The 75% Fraud Penalty: Who Has To Prove It

If your Notice of Deficiency asserts the civil fraud penalty, the IRS has to prove it by clear and convincing evidence. Here is what that means for you.

Liam Williams

Liam Williams

— 16 min read
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Your Notice of Deficiency doesn't say 20%. It says 75%, and somewhere on the page it uses the word fraud. That is the IRS's most serious civil penalty, and it changes everything about your case.

Here is the single most important thing to understand, and it cuts in your favor: on the fraud penalty, the IRS has to prove it—not you—and it has to prove it by a much higher standard than usual. A genuine mistake, sloppy records, or an aggressive-but-arguable position is not fraud. Fraud is intentional deceit, and the IRS has to convince the judge of it with clear and convincing evidence.

But be honest with yourself about where you are. The fraud penalty often travels alongside a criminal investigation, and it removes the statute of limitations entirely. This is the one merits issue in this whole library that is not a do-it-yourself fight. This article explains exactly what the IRS must prove and how high its bar is—so you are not paralyzed by the word "fraud"—and then points you, firmly, toward professional help.

The fraud penalty is the heavier cousin of the 20% accuracy penalty. If the IRS can't prove fraud, the case often drops to that lesser penalty—so read this alongside How To Fight the IRS Accuracy-Related Penalty in Tax Court, which owns the 20% rules and several defenses this article only summarizes.

What the Fraud Penalty Is—§ 6663

The civil fraud penalty lives in IRC § 6663. Three features make it different from every other penalty you might face.

The 75% rate—§ 6663(a). The statute says that "if any part of any underpayment of tax required to be shown on a return is due to fraud, there shall be added to the tax an amount equal to 75 percent of the portion of the underpayment which is attributable to fraud." Put plainly: it is three and three-quarter times the size of the 20% accuracy penalty, on the same dollar of underpaid tax.

The whole-underpayment presumption—§ 6663(b). This is the pivotal mechanic, and you need to understand it. Once the IRS establishes that any portion of an underpayment is due to fraud, "the entire underpayment shall be treated as attributable to fraud, except" any portion the taxpayer establishes—by a preponderance of the evidence—was not attributable to fraud.

Read that again, because it sets up two separate fights. The IRS only has to prove fraud as to one item by clear and convincing evidence. Once it does, the 75% penalty presumptively attaches to the whole underpayment for that year. The burden then shifts to you to peel off the honest portions—and your standard for that clawback is the lower "preponderance" (more likely than not) standard. So your two distinct goals are: (1) defeat the fraud finding entirely, by keeping the IRS from proving even one fraudulent item; or, failing that, (2) prove which portions were honest mistakes to shrink the 75% base.

One spouse only on a joint return—§ 6663(c). This is a real defense that readers miss. On a joint return, the fraud penalty "shall not apply with respect to a spouse unless some part of the underpayment is due to the fraud of such spouse." The penalty rides only on the spouse who actually committed fraud. The other spouse may also be a candidate for innocent-spouse relief—a separate escape hatch worth knowing about.

Civil Fraud Is Not the Criminal Charge

Keep two things separate. The § 6663 civil fraud penalty is a money penalty in a civil deficiency case. It is not the criminal charge. Criminal tax evasion lives in § 7201, is prosecuted by the Department of Justice, carries prison exposure, and must be proved "beyond a reasonable doubt." This article is about the civil penalty in Tax Court.

But the two often travel together, and you need to hear this clearly: a fraud allegation can signal a parallel or prior criminal referral to IRS Criminal Investigation. If there is any criminal exposure at all, you need a lawyer before you say anything to anyone—there are Fifth Amendment issues, and the risk that what you say in Tax Court is used against you elsewhere. This is the single strongest reason in this entire library to get professional help before you act.

Here is a piece of the doctrine that surprises people: a criminal acquittal does not save you from the civil penalty. In Helvering v. Mitchell, 303 U.S. 391 (1938), the Supreme Court held that the civil fraud addition is a remedial sanction—"a safeguard for the protection of the revenue and to reimburse the Government for the heavy expense of investigation"—not criminal punishment. So imposing it after a criminal acquittal does not violate the Double Jeopardy Clause. The mirror-image point matters more for most readers: because the civil penalty uses the lower clear-and-convincing standard, the IRS can lose (or never bring) a criminal case and still pursue the civil 75% penalty.

The Good News—The IRS Has To Prove It, By Clear and Convincing Evidence

This is the conceptual heart of your case and your biggest source of leverage. In an ordinary Tax Court case, you carry the burden of proof on the deficiency—Tax Court Rule 142(a) puts "the burden of proof" on the petitioner. The fraud penalty is the dramatic exception.

The burden is on the IRS—§ 7454(a). IRC § 7454(a) says that "in any proceeding involving the issue whether the petitioner has been guilty of fraud with intent to evade tax, the burden of proof in respect of such issue shall be upon the Secretary." Not the burden of production that applies to the accuracy penalty—the full burden of persuasion, and it never shifts to you on the fraud issue.

At a heightened standard—Rule 142(b). Tax Court Rule 142(b) spells out the standard: in any case involving fraud with intent to evade tax, "the burden of proof in respect of that issue is on the respondent, and that burden of proof is to be carried by clear and convincing evidence." That is a higher bar than the ordinary civil "preponderance" standard, and it is the government's to clear.

What the IRS actually has to show. The Tax Court breaks the IRS's burden into two elements: (1) there was an underpayment of tax for each year at issue, and (2) at least some portion of that underpayment was due to fraud. And it defines fraud narrowly: fraud is intentional wrongdoing designed to evade tax believed to be owing. The IRS meets its burden by showing that the taxpayer intended to evade taxes known to be owing by conduct intended to conceal, mislead, or otherwise prevent the collection of taxes.

Fraud is never presumed. The courts say fraud "is not to be presumed or based upon mere suspicion." But because almost nobody admits to fraud, the IRS is allowed to prove intent with circumstantial evidence, and an intent to mislead can be inferred from a pattern of conduct. That is where the "badges of fraud" come in—the next section.

Your central theme: this was a mistake, not a scheme. Tie it all together. Clear and convincing evidence of intentional deceit is a high bar, and it is the IRS's to clear. A genuine error, sloppy records, an aggressive-but-arguable position, or reliance on a preparer is negligence at most—which supports the 20% accuracy penalty, not the 75% fraud penalty. If the IRS can't prove intent to deceive by clear and convincing evidence, the fraud penalty fails, and at worst the case drops back to the accuracy penalty you can fight on its own terms.

How the IRS Proves Intent—The Badges of Fraud

Because intent is almost never admitted, courts infer it from circumstantial "badges of fraud." This is the most practically useful thing to understand, because you can see exactly what the IRS will point to—and what an innocent explanation for each looks like.

Courts look at factors that include, but are not limited to:

  1. understating income
  2. keeping inadequate records
  3. giving implausible or inconsistent explanations of behavior
  4. concealing income or assets
  5. failing to cooperate with tax authorities
  6. engaging in illegal activities
  7. supplying incomplete or misleading information to a tax return preparer
  8. providing testimony that lacks credibility
  9. filing false documents, including false tax returns
  10. failing to file tax returns
  11. dealing in cash

The standard enumeration of these badges comes from Bradford v. Commissioner, 796 F.2d 303 (9th Cir. 1986). It is worth knowing what Bradford actually was, because it is not a taxpayer victory: the Tax Court found fraud by clear and convincing evidence, and the Ninth Circuit affirmed. Bradford had failed to file for four straight years, dealt in cash to avoid scrutiny, filed false W-4s, and refused to cooperate with the revenue agent—a classic multi-badge case. It is the source of the list, not an example of someone beating it.

No single badge is dispositive. The weighing rule, from Niedringhaus v. Commissioner, 99 T.C. 202 (1992), is that no single factor is dispositive, but the existence of several factors together is persuasive circumstantial evidence of fraud. One badge, innocently explained, is not clear and convincing evidence of intent. The IRS needs a pattern that excludes the innocent explanation.

Your education and sophistication cut against you. Courts weigh the badges in light of the taxpayer's education and sophistication. This is a double-edged sword. The more financially sophisticated you are, the harder it is to argue "I didn't understand"—an accounting degree or experience as a financial professional makes an innocent-mistake story far less plausible.

How to answer a badge. Start from the exam report: the badges the IRS is relying on are spelled out in your Form 4549 and the agent's workpapers, so list them out and take them one at a time. For each, your job is to assemble the contemporaneous record—bank statements, the 1099 you never received, the preparer's notes, an amended return you filed before the audit—that converts the badge from "concealment" into ordinary error or disorganization. Keep the standard in mind: the IRS must exclude the innocent explanation by clear and convincing evidence, so a documented, plausible innocent story for each badge is exactly what defeats the inference. Give each badge its counter-narrative:

  • Understating income → an honest omission of a 1099 you never received, or a reasonable basis-tracking error—not concealment.
  • Inadequate records → poor recordkeeping is negligence, not fraud, unless it is paired with active concealment.
  • Cash dealing → an ordinary cash business whose bank deposits match the income you reported—the opposite of Bradford.
  • Inconsistent explanations or non-credible testimony → this is precisely why a fraud case is not a do-it-yourself fight. Your own words on the stand can sink you, and a story that shifts under questioning is itself a badge.

The Supervisory-Approval Lever—§ 6751(b)

The fraud penalty is a "penalty under this title," so it is subject to the written-supervisory-approval requirement of IRC § 6751(b)(1): no penalty "shall be assessed unless the initial determination of such assessment is personally approved (in writing) by the immediate supervisor" of the person who made it. And this lever really does kill penalties.

The clearest illustration is Beleiu v. Commissioner, T.C. Memo. 2025-70 (discussed in full below): the IRS conceded the entire 2015 civil fraud penalty because it could not show it had obtained timely managerial approval under § 6751(b) for that year. For the other years, the parties agreed the approval was timely, so the penalty fight went forward on the merits. Same case, both outcomes: no approval, penalty gone; approval present, penalty proceeds.

So in your petition, deny that the penalty received timely written supervisory approval, and demand the approval form. For the full machinery—the December 2024 final regulation and its bright-line timing, and how this fits the IRS's burden—see the accuracy-penalty article, which owns the § 6751(b) deep dive. One note specific to fraud: a fraud penalty is never "automatically calculated through electronic means," so the electronic-means exception that complicates some accuracy-penalty cases simply does not apply here.

Reasonable Cause—Why It's Rarely the Answer to Fraud

The reasonable-cause defense in IRC § 6664(c)(1) says that "no penalty shall be imposed under section 6662 or 6663"—note that it names the fraud penalty—for any portion of an underpayment where there was reasonable cause and the taxpayer acted in good faith. So on paper, reasonable cause is a defense to fraud.

In practice, it is nearly a logical impossibility to win against a proven fraud finding. Reasonable cause requires good faith; the fraud penalty requires the IRS to prove intent to deceive. If the IRS has proven intentional wrongdoing by clear and convincing evidence, then by definition you were not acting in good faith on that portion. The two cannot coexist on the same dollars.

So treat § 6664(c) as a defense to the non-fraud portions—the § 6663(b) clawback—and to the accuracy penalty in the alternative, not as a way to defeat a fraud finding the IRS has already established. Your real defense to the fraud penalty is to defeat intent (the burden and the badges, above). The reasonable-cause standard itself—the Neonatology reliance test, the "effort to assess the proper tax" factor, and the Boyle deadline boundary—is explained in the accuracy-penalty article.

The Statute of Limitations Disappears—§ 6501(c)(1)

This is the consequence that makes the fraud penalty uniquely dangerous, and it is probably your biggest worry: can they really go back that far?

Normally, IRC § 6501(a) gives the IRS 3 years after a return is filed to assess additional tax. But § 6501(c)(1) carves out fraud: "in the case of a false or fraudulent return with the intent to evade tax, the tax may be assessed, or a proceeding in court for collection of such tax may be begun without assessment, at any time."

In plain terms: a fraudulent return has no statute of limitations. The IRS can assess the tax and the 75% penalty decades later. That is what lets a fraud case sweep in many more years than a normal three-year audit.

Two precision points. First, the unlimited period turns on fraud on the return, and there is a verified circuit split on whether a preparer's fraud (without the taxpayer's own intent) opens it—the Federal Circuit requires the taxpayer's intent, the Third Circuit holds preparer fraud is enough. That split, and the cases behind it, are owned by Understanding IRS Statutes of Limitations; read it there rather than here.

Second, the § 6501(c)(1) standard mirrors the § 6663 standard: the IRS must prove the return-fraud by clear and convincing evidence, the same proof it needs for the penalty. So in practice, a year in which the IRS sustains the fraud penalty is also a year for which the limitations period was open—the same evidence does double duty. The fraud finding is what keeps an old year alive.

Your Total Exposure—75% Plus Interest Across Many Years

Before you build a defense, get clear on what is actually at stake, because in a fraud case it is far more than the disallowed item. Your exposure has three layers, and they compound on each other:

  1. The deficiency—the additional tax. Because of § 6501(c)(1), this can span many more years than a normal audit.
  2. The 75% fraud penalty, presumptively on the whole underpayment for each fraud year under § 6663(b).
  3. Interest under IRC § 6601, running on the deficiency from the original due date of the return.

That interest layer is the silent killer in fraud cases. Because the years go back so far, decades of compounding interest can exceed the tax and the penalty combined—the total bill for an old year can end up larger than the income you earned that year. How Interest Works on Your IRS Tax Debt and Understanding Your IRS Balance show how the pieces stack up.

Make this concrete. Suppose the IRS finds a $40,000 underpayment for a single year and asserts fraud on all of it. The 75% penalty alone is $30,000—where the 20% accuracy penalty on the same dollars would have been $8,000. Add the $40,000 tax, the $30,000 penalty, and years of interest on top, and a single fraud year can run well past $80,000–$100,000 before you account for the other years § 6501(c)(1) drags in. That gap between $30,000 and $8,000—on identical dollars—is exactly why the fraud-versus-accuracy question is the whole ballgame.

Verify what the IRS actually asserted. Before you fight, confirm which penalty is on the table, because the defenses are completely different:

  • Form 4549 (Report of Income Tax Examination Changes) and the examination report behind your 30-day or 90-day letter spell out the proposed deficiency and the penalty—including whether the IRS asserted § 6663 (fraud) or § 6662 (accuracy). Read it line by line and find the penalty code. If it cites § 6662, you are in the accuracy-penalty world, not this one. If it cites § 6663, look for the IRS's fraud explanation: the badges it is relying on, the years it claims are fraudulent, and the "intent" language. That tells you the case the IRS thinks it can prove—and where its evidence is thin.
  • Your IRS account transcript is taxpayer-accessible through IRS.gov Get Transcript. Pull it to confirm exactly what was assessed and when. For the code map, see How To Get and Read Your IRS Transcripts and How To Read IRS Transcript Codes rather than guessing at a transaction code here.
  • Check the underpayment math itself, not just the penalty code. The 75% rides on the underpayment, so every dollar you knock off the IRS's income or deficiency figure also removes 75 cents of penalty. Reconcile the IRS's income numbers against your own records and transcripts the way you would in an unreported-income case—the deficiency is not a fixed number just because the notice prints one. And even on a year where the fraud finding sticks, the § 6663(b) clawback lets you shrink the base by proving, more likely than not, which dollars were honest.

A Real Case—Beleiu

Beleiu v. Commissioner, T.C. Memo. 2025-70, decided in July 2025, is a clean walk through every moving part of a fraud case—and a sober one. Two cautions up front: the taxpayer here was not pro se. Mrs. Beleiu had counsel and used accountants, and she still lost on the merits for the years that mattered. This is what the standard looks like in practice, not a template for a win.

Here is the sequence the case illustrates:

  • The 75% rate and the § 6663(b) presumption. The court applied § 6663(a)'s 75% penalty and § 6663(b)'s rule that once the IRS proves fraud as to part of an underpayment, the whole underpayment is treated as fraudulent unless the taxpayer shows otherwise by a preponderance.
  • The clear-and-convincing burden, on the IRS. The court held the Commissioner had to prove the two elements—an underpayment, and that at least some part was due to fraud—by clear and convincing evidence under § 7454(a) and Rule 142(b).
  • The badges, applied. The fraud rode on omitted business income, and the court worked through the badges. It leaned heavily on Mrs. Beleiu's sophistication—an accounting degree, an MBA, and work as a financial analyst—which made her "I didn't understand" explanation implausible. Sophistication that cuts against the taxpayer is the recurring lesson.
  • The § 6751(b) lever worked—for one year. The IRS conceded the entire 2015 penalty because it had not secured timely supervisory approval. For 2012–2014, approval was stipulated as timely, and those penalties were sustained.
  • The non-liable spouse—§ 6663(c). The IRS pursued Mrs. Beleiu, who prepared the returns and omitted the income, and conceded that Mr. Beleiu was not liable for the fraud penalties for any year. The penalty rode only on the spouse who committed the fraud.
  • The accuracy penalty went moot. The IRS had asserted the § 6662 accuracy penalty in the alternative. Once the court sustained the 75% fraud penalty, the 20% alternative fell away—you cannot stack both on the same dollars.

The takeaway is not "you can beat this on your own." It is the opposite: even a represented, financially sophisticated taxpayer lost the merits, and the only year that fell did so on a procedural lever, not on the facts. That is the standard you are up against.

What To Do Now

A fraud allegation is the moment to be most careful and least alone. A concrete sequence:

  1. Calendar the 90 days deadline from the date on your Notice of Deficiency (150 days if you are addressed outside the US). It cannot be extended. See How To File Your Tax Court Petition for the mechanics.
  2. If there is any criminal angle, talk to a lawyer before you talk to anyone—especially IRS Criminal Investigation. Do not give a statement, sit for an interview, or volunteer documents until you have counsel. This comes before everything else on this list.
  3. Pull your account transcript and read Form 4549. Confirm the IRS asserted § 6663 (fraud) and not just § 6662 (accuracy)—the defense is completely different. Identify the years and the badges the IRS is relying on.
  4. In your petition, deny fraud and deny § 6751(b) approval, and demand the approval form. Denying fraud puts the burden where the law already puts it: on the IRS, at the clear-and-convincing standard. The supervisory-approval demand costs you nothing and, as Beleiu shows, can end a penalty year outright. You will lay this out in detail in your pretrial memorandum and force production through discovery.
  5. Pick the right track. A fraud-penalty case will almost always exceed the $50,000 small-case ceiling once you add the 75% penalty, so it is typically a regular case. See Small Case or Regular Case: Which Should You Choose.
  6. Expect settlement to be part of the path. Most (76%) of Tax Court cases close by formal settlement, and more than 99% resolve without a trial on the merits. Fraud penalties are frequently conceded or reduced in settlement—especially where the IRS's intent evidence is thin or supervisory approval is missing—but a genuine fraud case is high-stakes, and that negotiation should be done with professional help, not alone.

Get Help

Around 89% of Tax Court petitioners represent themselves, and for many ordinary disputes that is entirely workable. A fraud case is the exception. The win-rate gap is real—about 12% for pro se petitioners versus about 23% for represented ones in the most recent data—and it matters most precisely where the IRS alleges fraud and a criminal referral may be lurking.

If your income is at or below 250% of the poverty line and your dispute is at or below $50,000 per tax year, you may qualify for free representation through a Low Income Taxpayer Clinic. Fraud cases often exceed that dispute limit because of the 75% rate, but many clinics will still consult or point you to counsel. For the broader decision about when to bring in help, see When To Get Professional Help With Your Tax Dispute. With a fraud allegation, that answer is: now.

Resources

Statutes and rules:

IRS forms:

  • Form 4549, Report of Income Tax Examination Changes — shows the proposed deficiency and whether the § 6663 fraud penalty or the § 6662 accuracy penalty was asserted
  • IRS Get Transcript — pull your account transcript to confirm the assessed penalty

Cases cited:

Companion articles on TaxCourtHelp:

This article is for informational purposes only and does not constitute legal or tax advice. For advice specific to your situation, consult a qualified tax professional or attorney.

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