A CP2000 arrives when the income or payment information the IRS received from third parties does not match your return. The IRS says it explains proposed changes and is not a bill. Many CP2000s also include a proposed accuracy-related penalty.

People focus on the tax, which makes sense. But the penalty deserves its own attention, because the way you respond, or do not respond, changes what the IRS has to do to assess it.

Where the penalty comes from

IRM 20.1.5.4.2 explains that the Automated Underreporter program matches information returns against individual income tax returns. If the accuracy-related penalty applies, the system generates a penalty paragraph for the CP2501 initial inquiry or the CP2000 notice of proposed adjustment. In the absence of a response, the manual says the penalty determination will be made on the basis of return information and the significance of the amounts omitted.

In practice, the penalty on a CP2000 is usually the substantial understatement component under IRC 6662(d), which applies when the understatement exceeds the greater of 10 percent of the correct tax or $5,000 for individuals, with 5 percent substituted for taxpayers who claim the section 199A deduction. IRM 20.1.5.8.1 also notes that regulations say negligence is strongly indicated where a taxpayer fails to report income shown on an information return.

Why responding changes the rules

Most accuracy-related penalties require written supervisory approval under IRC 6751(b) before they can be assessed. There is an exception for penalties automatically calculated through electronic means.

IRM 20.1.1.2.3.2 applies that exception to AUR and campus exam cases. If you do not respond to the letter that proposes the penalty, it is considered automatically calculated and may be assessed without written supervisory approval. But if you respond, orally or in writing, challenging the penalty or the tax it is based on, and an examiner considers your response before assessment or before a notice of deficiency, written supervisory approval is required. IRM 20.1.5.4.2 says the same: on AUR cases involving certain taxpayer contacts, asserting the penalty requires written supervisory approval.

That does not make the penalty go away. It means a human being has to look at it and a supervisor has to sign off. That is a better position than a default, and it preserves an issue you can check later. See supervisory approval under section 6751(b).

Respond on time

The IRS tells CP2000 recipients to reply by the date on the notice, complete and sign the response form if one is included, state whether you agree or disagree, and include supporting documentation. If you do not reply or the discrepancy cannot be resolved, it says it may send another notice and a bill. For an income tax adjustment, that next notice is typically a statutory notice of deficiency, which starts the time to petition the Tax Court.

If you need more time, the IRS says you can send an extension request using one of the reply options. Use it rather than missing the date.

Separate the tax from the penalty

Your response can agree with the tax and disagree with the penalty. The response form lets you state agreement or disagreement, and nothing stops you from agreeing with part of the notice and attaching an explanation about the rest. Many CP2000 cases are exactly that: the 1099 was right, the income was missed, and the question is whether the miss deserves a 20 percent penalty.

If you disagree with the tax, say why and prove it. A Form 1099-B with no cost basis, a 1099 reported under the wrong Social Security number, income already reported elsewhere on the return: fixing the tax may eliminate the understatement or drop it below the threshold, and the penalty goes with it.

If the notice is right but you have other items to report, the IRS says to file Form 1040-X with CP2000 written on top and send it with the response.

What to say about the penalty

Address the penalty in its own section of the response. The defenses that fit CP2000 cases most often:

  • No substantial understatement. After correcting the tax, check whether the understatement still exceeds the IRC 6662(d) threshold.
  • Reasonable cause and good faith under IRC 6664(c). Treas. Reg. 1.6664-4(b)(1) says reliance on erroneous information returns can qualify if you did not know or have reason to know they were wrong, and an isolated computational or transcriptional error is generally not inconsistent with good faith. Explain how the item was missed and what you did to get it right.
  • Experience and sophistication. IRM 20.1.5.7.3 says an honest misunderstanding that is reasonable in light of your experience, knowledge and education can support relief.
  • Reliance on a preparer who had the form. If you gave the preparer the Form 1099 and it was left off, that is reliance on advice and preparation, evaluated under Treas. Reg. 1.6664-4(c). Show what you provided.

Remember that first-time abatement does not apply to the accuracy-related penalty. It is a common mistake to ask for it on a CP2000. The full set of defenses is in accuracy-related penalty defenses.

A sample structure for the response

A hypothetical taxpayer agrees she omitted a Form 1099-INT but disagrees with the proposed penalty. Her response might look like this:

  • The signed response form, checking that she partially agrees, with a cover statement referencing the notice number, tax year and her taxpayer identification number.
  • Section one, the tax: she agrees the interest income was omitted and does not dispute the tax increase.
  • Section two, the penalty: she requests that the accuracy-related penalty not be assessed under IRC 6664(c). She explains that the interest came from a small savings account she had forgotten after her bank merged with another, that the Form 1099-INT was mailed to an address she had left the year before, that she never received a statement for the account at her new address, and that she reported every other information return she received.
  • Attachments: the address history, the account opening documents, and her prior returns showing consistent reporting.

Whether that explanation succeeds depends on the facts and the reviewer. But it gives a human being something specific to evaluate, which is exactly what a default never does.

After the CP2000

If the IRS does not accept your response, an income tax CP2000 case generally leads to a statutory notice of deficiency, which gives you the right to petition the Tax Court before assessment. Do not ignore it. Publication 5 says the time to petition is usually 90 days, or 150 days if the notice is addressed to a person outside the United States, and the IRS and the Tax Court cannot change that period.

If the penalty is assessed and you then ask for abatement, IRM 20.1.5.5 says the request will be considered on the evidence, but post-assessment accuracy-related penalty requests are not forwarded to Appeals, and the remaining recourse after a denial is to pay and file a claim for refund. That is a harder path than responding to the CP2000.

Also check prior years. The IRS's CP2000 page suggests that if earlier returns have the same issue, you file amended returns. Amending before the IRS contacts you about those years can make them qualified amended returns, which under Treas. Reg. 1.6664-2(c) avoid the accuracy-related penalty on the corrected tax.

One letter, sent on time, with the penalty addressed separately and supported by facts. That is most of the battle.