I Did Not Know: When Ignorance of the Law Supports Penalty Relief

Ignorance of the law is no excuse. Everyone has heard that. In tax penalty cases, it is mostly true. Mostly.

The Internal Revenue Manual does not say ignorance of the law is never reasonable cause. It says ignorance alone is not enough, and then it tells IRS employees what else to look for. If you were penalized for an obligation you did not know existed, those factors are your roadmap.

The starting point

IRM 20.1.1.3.2.2.6 opens by acknowledging that taxpayers may not be aware of specific obligations to file or pay. It then sets the baseline: the ordinary business care and prudence standard requires taxpayers to make reasonable efforts to determine their tax obligations.

The IRS website says the same thing more bluntly. In its list of reasons that generally do not qualify as reasonable cause for failing to file or pay, it includes lack of knowledge, explaining that you are responsible for knowing or getting advice on filing requirements, deadlines and amounts owed.

So the question is never just whether you knew. It is whether a reasonable person in your position would have found out.

The five factors

The manual says reasonable cause may be established if the taxpayer shows ignorance of the law in conjunction with other facts and circumstances, and lists these:

• Your education.
• Whether you have previously been subject to the tax.
• Whether you have been penalized before.
• Whether there were recent changes in the tax forms or law that you could not reasonably be expected to know.
• The level of complexity of the tax or compliance issue.

It then states the test in two alternatives. You may have reasonable cause due to ignorance of the law if either a reasonable and good faith effort was made to comply, or you were unaware of a requirement and could not reasonably be expected to know of it.

And it adds a caution worth repeating: reasonable cause should never be presumed, even when ignorance of the law is claimed.

When the argument is strong

Put the factors together and a pattern emerges. The argument is strongest when several of these are true at once:

• The obligation was new to you. You had never been subject to this tax or required to file this form before.
• The rule was new or recently changed, or the form itself changed in a way that was not obvious.
• The issue was genuinely complex, not a basic deadline.
• You had no prior penalties suggesting you had been put on notice.
• Once you learned of the obligation, you complied promptly and completely.

Think of a first-time obligation on an obscure information return, triggered by an unusual transaction, where the requirement is buried in regulations most professionals rarely see. That is different in kind from forgetting that individual returns are due in April.

When it fails

The argument fails when the obligation is basic. The Supreme Court made this point about deadlines in United States v. Boyle, 469 U.S. 241 (1985), observing that no special training is needed to learn that returns have due dates and taxes must be paid when due. Not knowing the filing deadline for your own income tax return is not the kind of ignorance the manual protects.

It also fails when your history shows you knew. If you filed the same return in prior years, or were penalized for the same failure before, the IRS will conclude you were on notice. The manual lists both as factors for exactly this reason.

And it fails when you did nothing to find out. The first alternative in the manual's test requires a reasonable and good faith effort to comply. Even if you did not know the specific rule, did you ask anyone? Did you use a preparer? Did you read the instructions for the forms you did file? Effort matters even when it does not produce the right answer.

Ignorance plus advice

The most common winning version of this argument combines ignorance with reliance. You did not know the rule, so you asked a competent professional, who told you the requirement did not apply. That is not really an ignorance defense anymore. It is a reliance on substantive advice defense, which the Supreme Court recognized in Boyle when it said that relying on an adviser's advice on a question of tax law, such as whether a liability exists, can be reasonable.

If that is your situation, frame it that way and document the advice. The tax professional reliance guide explains how.

The manual's reliance section also cross-references this one. It asks whether a failure to comply was due to a change in tax law the taxpayer could not reasonably be expected to know. Recent law changes are where ignorance and reliance overlap most often.

Information returns and first-time filers

For information return penalties, the regulations take a related approach. The IRS website lists being a first-time filer of a particular form among the significant mitigating factors that can support a reasonable cause waiver under Treas. Reg. 301.6724-1, along with acting in a responsible manner. That is a separate test with its own elements, covered in the information return penalty waiver guide.

Two hypothetical taxpayers

Consider two hypothetical people, both penalized for failing to file an information return they had never heard of.

The first is a retired schoolteacher who inherited an interest in a small foreign business from a relative abroad. She had never owned a foreign interest, never filed an international information return, and had no prior penalties. She filed her own Form 1040 on time every year. When a new preparer told her about the filing requirement, she filed within weeks. Her education, her lack of prior exposure, the complexity of the rule and her prompt correction all point the same way.

The second is a business owner with a finance background who had filed the same form for the same entity for several years, then stopped. His claim that he did not know the requirement applies runs straight into two of the manual's factors: he had previously been subject to the obligation and his background suggests he could have found out.

Same claim. Opposite results. The factors decide, not the words I did not know.

One caution about the first example: many international information return penalties have their own rules and are outside first-time abatement, as the manual's list of excluded returns shows. The ignorance argument there would be made as reasonable cause under the specific penalty's standard.

Presenting the argument

If you are going to rely on ignorance of the law, answer each of the manual's five factors directly. Describe your education and background honestly. Explain that you were never previously subject to this obligation, if true. Identify the rule and explain why it was not something a person in your position would have known, citing any recent change. Describe the complexity. And show what you did as soon as you learned.

Then add everything else that shows ordinary business care. You kept records. You filed your other returns on time. You responded to the first IRS notice. The manual says ignorance works in conjunction with other facts. Give it the other facts.

If your history is clean, check first-time abatement before building this argument, since it requires no explanation at all for failure-to-file, failure-to-pay and deposit penalties. Ignorance of the law is a hard road. Do not take it if an easier one is open.