The IRS assesses dozens of different penalties, and they compound. A late return that sat unpaid for a few years can generate a failure-to-file penalty, a failure-to-pay penalty, and interest running on all of it, until the balance bears little resemblance to the original tax.
Penalties can be removed. What they cannot be is argued away by explaining that the amount is unfair.
The penalties that come up most
Failure to file
Five percent of the unpaid tax for each month the return is late, capped at twenty-five percent. It accrues far faster than the failure-to-pay penalty, which is why filing on time matters even when you cannot pay.
Failure to pay
Half of one percent per month on the unpaid balance, also capped at twenty-five percent. Modest monthly, substantial over years.
Accuracy-related
Twenty percent of the underpayment, asserted where there was negligence, disregard of rules, or a substantial understatement. Very commonly proposed alongside an examination adjustment, and very commonly contestable.
Fraud
Seventy-five percent of the underpayment attributable to fraud. The government carries a heavy burden of proof here, and the presence of this penalty changes the character of a case entirely.
Reasonable cause
The central standard is whether you exercised ordinary business care and prudence and were nonetheless unable to comply. That is a factual question, and it is won with documentation rather than description.
Circumstances that genuinely support relief include serious illness or death affecting the taxpayer or immediate family, destruction of records, reliance on incorrect written advice from a competent professional given the full facts, and events outside your control that made compliance impossible. What rarely succeeds on its own is not having the money, or not knowing about the obligation.
Reliance on a professional is not automatic. It supports relief where the adviser was competent, was given complete information, and the matter was one requiring professional judgment. It does not where the obligation was simply to file something by a date that everyone knew.
First-time abatement
An administrative waiver, available where the preceding three years are clean of penalties and current filing and payment obligations are met. It is straightforward, it does not require proving anything about circumstances, and it is routinely missed — the IRS does not usually volunteer it. Where both routes exist, it is worth thinking about which to use, since the waiver can only be spent once.
Interest is different
Interest on an underpayment is generally not abatable, because it compensates the government for the time value of money rather than punishing anything. The exception is interest attributable to unreasonable IRS error or delay in performing a ministerial or managerial act, which is narrow but occasionally real. Interest on an abated penalty comes off with the penalty.
What to do now
Obtain the account transcripts for the years involved so the penalties are itemised rather than aggregated into a single frightening number. Then work out which are eligible for the first-time waiver and which require a reasonable cause argument, and gather the documents that would support one.
Penalties larger than the tax?
Send the years involved and what the notice shows. Penalties are frequently the most movable part of a balance. No charge for the first conversation.
If your notice has a date on it, start now.
Send a general description of your situation. Please do not include Social Security numbers, account numbers, or documents in a first message.