Tax Fraud vs. Negligence: Where the IRS Actually Draws the Line

I’m Darrin Mish. Tampa tax attorney, 32 years in, more than $100 million in IRS debt resolved. What follows isn’t theory. It’s what I’ve actually watched work.

A client sat across from me once and said, “They’re calling it fraud.” He’d left some 1099 income off a return. One year. He was already picturing handcuffs.

He wasn’t facing fraud. He was facing a 20% penalty and a bad afternoon.

The difference between negligence and fraud is the difference between a bill you can pay and a problem that can put you in a federal courtroom. Most people cannot tell them apart, and a fair amount of what’s written online gets it wrong.

Here’s where the line actually sits.

The short version

Look at the “who proves it” row. That’s the whole ballgame, and I’ll come back to it.

What negligence actually means

The accuracy-related penalty under IRC 6662 is 20% of the portion of the underpayment it applies to. The statute defines negligence as “any failure to make a reasonable attempt to comply with the provisions of this title.”

That’s a low bar to trip over. The regulations spell it out further: failing to keep adequate books and records counts. Failing to substantiate an item counts. So does leaving off income that showed up on an information return. The IRS already has that document, and the regulation says negligence is “strongly indicated” when you omit it.

There’s a second trigger that has nothing to do with carelessness: substantial understatement. If your understatement exceeds the greater of 10% of the tax you should have shown or $5,000, the same 20% applies. Claim the Section 199A deduction and that 10% drops to 5%.

You can be perfectly diligent and still land here on the numbers alone.

One thing the penalty is not: a late-filing punishment. The IRM is explicit that it “will not be asserted solely for filing a return late.”

What tax fraud actually means

Civil fraud under IRC 6663 is 75% of the portion of the underpayment attributable to fraud. Not 75% of your tax bill. Not 75% of your balance. Seventy-five percent of the underpayment tied to the fraud.

The statute never defines fraud. The IRM does the work instead, and the sentence worth memorizing is this one:

“Intent is distinguished from inadvertence, reliance on incorrect technical advice, sincerely-held difference of opinion, negligence or carelessness.”

Fraud is a state of mind. Everything else on that list is a mistake. The IRS has to show you knew the return was false and filed it anyway, meaning to evade tax you believed you owed.

Now the provision nobody warns you about. Under IRC 6663(b), if the IRS establishes that any portion of the underpayment is fraudulent, the entire underpayment is treated as fraudulent. One bad year, one bad item, and the presumption swallows the whole thing.

You can rebut it, but only by showing which portions weren’t fraudulent, by a preponderance of the evidence. That’s your burden, not theirs. Most write-ups on this topic skip the rebuttal right entirely.

Who has to prove it, and why that decides cases

This is where tax negligence and tax fraud genuinely part ways, and it matters more than the penalty rates.

For the 20% penalty, you carry the burden. The IRS asserts it; you disprove it. IRC 7491(c) gives the IRS a burden of production on penalties against individuals, meaning they have to put something on the table, but the burden of persuasion stays with you.

For civil fraud, the burden flips entirely. IRC 7454(a): “the burden of proof in respect of such issue shall be upon the Secretary.” And Tax Court Rule 142(b) sets the standard at clear and convincing evidence, which is more than preponderance, less than beyond a reasonable doubt.

After 32 years, here’s the practical read: the IRS asserts negligence freely, because it costs them little to be wrong. They assert fraud carefully, because they have to carry it.

The badges of fraud, and the mistake people make with them

Direct proof of intent almost never exists. Nobody writes “I am now evading tax” in the margin. So the IRS builds the case circumstantially, using what it calls badges of fraud.

The short list runs to ten: understating income, fictitious deductions, two sets of books, obstructive conduct, a consistent multi-year pattern, implausible explanations, illegal activity, inadequate records, dealing in cash, and failing to file. The full enumerated list in the IRM runs to 67 items across six categories.

Here’s the mistake. People treat badges like a scoreboard, as though six of ten means you lose. The IRM says the opposite:

“An evaluation of fraud is based on the weight of the evidence rather than the quantity of the factors.”

And there’s a harder limit that rarely gets mentioned. The IRM draws a line between indicators of fraud and affirmative acts of fraud. Indicators only signal that something may have happened. Affirmative acts establish that something was deliberately done.

“Fraud cannot be established without affirmative acts of fraud.”

Messy records and a bad year are indicators. Destroying records after the audit opened is an affirmative act. That distinction wins cases.

Civil fraud versus criminal charges

Criminal tax evasion under IRC 7201 requires a tax due and owing, an affirmative attempt to evade, and willfulness, defined as “the voluntary, intentional violation of a known legal duty.” Maximum five years.

The statute says the fine maxes at $100,000, and that figure gets quoted constantly. It’s outdated as applied. 18 U.S.C. 3571 raises it to $250,000 for individuals and $500,000 for corporations, or twice the gross gain or loss, whichever is greater. The IRS acknowledges this in its own manual.

But IRC 7201 isn’t the charge you’re most likely to see. IRC 7206(1), filing a false return under penalties of perjury, gets charged more often, carries three years, and requires no proof that you owed a dime. The government only has to prove the return was false as to a material matter and that you didn’t believe it was true.

That has a consequence worth knowing. A 7201 conviction collaterally estops you from contesting civil fraud for those years. The fight is over. A 7206(1) conviction does not, because it never required proof of intent to evade tax. You can be convicted under 7206(1) and still defend the 75% penalty.

Also true, and it surprises people: the civil fraud penalty can be imposed on someone never charged criminally. Lower standard of proof, separate proceeding.

The statute of limitations myth

You will read, on a lot of websites, that tax fraud extends the IRS assessment window to six years. That is wrong, and it confuses two provisions that have nothing to do with each other.

• Normal rule (IRC 6501(a)): three years from filing.
• Fraud (IRC 6501(c)(1)): “the tax may be assessed… at any time.” No limit. Ever.
• Six-year rule (IRC 6501(e)(1)(A)): applies when you omit more than 25% of gross income. It turns on the size of the omission, not on intent. An honest mistake can trigger it.

No return filed at all? Also unlimited, under 6501(c)(3).

So a fraudulent return from 2009 is still assessable today. That is not a scare tactic. That is the statute.

Can you get hit with both penalties on the same money?

No. IRC 6662(b) says it plainly: “This section shall not apply to any portion of an underpayment on which a penalty is imposed under section 6663.”

One rate per dollar. Where two could apply, the higher one governs.

What you will see, and what gets misread as stacking, is the IRS asserting the 20% penalty as an alternative position in a notice of deficiency. That’s a fallback if the fraud case fails, not a second penalty.

Both can appear on the same return, though, applied to different portions of the underpayment.

What actually protects you

IRC 6664(c) provides a reasonable cause and good faith exception, and it covers both the accuracy-related penalty and the fraud penalty by its own terms. There are carve-outs for economic substance transactions, certain conservation easement disallowances, gross valuation overstatements on donated property.

In practice the defense does real work against negligence and almost none against fraud, for an obvious reason: if you genuinely acted in good faith, the IRS cannot prove the intent it needs. The defense is redundant by the time you’d need it.

The regulation names the factor that matters most: “the extent of the taxpayer’s effort to assess the taxpayer’s proper tax liability.” Not whether you got it right. Whether you tried.

One threshold catches people out. Under IRC 6664(b), neither penalty applies unless a return was actually filed. Non-filers don’t escape. They face the fraudulent failure to file penalty under IRC 6651(f) instead, proved on the same standard.

Where the line really sits

Avoidance is legal. The IRM says so directly. You have every right to “reduce, avoid, or minimize” your taxes by legitimate means. Someone who avoids tax “does not conceal or misrepresent, but shapes and preplans events” within the law.

Evasion conceals. That’s the line, and it isn’t about how much you owe or how messy your shoebox of receipts is.

If you’re reading this because something is wrong with a return you filed, the honest answer is that most of what looks like tax fraud from the inside is negligence from the outside. Bad records. A missed 1099. A deduction you couldn’t support. Expensive, fixable, not criminal.

The cases that turn into fraud cases usually involve something someone did after the problem started: moved money, altered a document, lied to an examiner. If that describes your situation, stop talking to the IRS and call a lawyer. Not a CPA. A lawyer.

Get Help Now

If you are facing an IRS penalty and you are not sure whether they are calling it negligence or fraud, you do not have to handle it alone. Contact the Law Offices of Darrin T. Mish, P.A. at (813) 229-7100 for a free consultation.