Is a CP2000 an Audit? How Underreporter Notices Differ From Exams

"I'm being audited." That is how most people describe a CP2000. I understand why. The IRS is questioning your return and proposing more tax. It feels like an audit.

Legally and procedurally, it is not one. The IRS runs the Automated Underreporter program and the examination program as separate operations with separate rules. Knowing which one you are in tells you what can happen next.

What the IRS says a CP2000 is

The AUR manual spells it out. IRM 4.19.3.1.2 states that Rev. Proc. 2005-32 provides authority to treat taxpayer contacts to verify a discrepancy between your return and an information return, or between your return and other information the IRS has, as contacts "not considered an examination, inspection or reopening."

Then the manual tells its own tax examiners, in capital letters, to "AVOID 'AUDITING' RETURNS." It explains that all returns in the AUR inventory were previously screened for unallowable items and audit potential and were not selected for action on either ground (IRM 4.19.3.2).

In plain English: your return was looked at by the exam selection process and passed. Then a computer noticed that a W-2 or 1099 did not match. That mismatch, and only that mismatch, is what the CP2000 is about.

Side by side

	CP2000 (AUR)	Examination
How it starts	Computer match of your return against information returns	DIF scoring and classification, related cases, research samples, referrals
Who works it	Campus tax examiners in AUR operations	Campus tax examiners (mail), tax compliance officers (office), revenue agents (field)
What it covers	Discrepancies between your return and third-party data, plus the tax effects that flow from them	Whatever items the IRS classified, and potentially more
First notice	CP2501 inquiry or CP2000 proposal	Initial contact letter, sometimes with a proposed Form 4549
Treated as an exam?	No, per Rev. Proc. 2005-32 as cited in IRM 4.19.3.1.2	Yes
End point if unresolved	Statutory notice (CP3219A), then assessment	30-day letter, statutory notice (Letter 3219 in campus exams), then assessment
Fixing it after assessment	AUR reconsideration, worked in AUR	Audit reconsideration under IRM 4.13

Why the label matters: four practical consequences

1. The scope is narrow

An AUR case is about the mismatch. The CP2000 can affect related items on your return, such as credits, deductions and the tax computation, because changing income changes the math. The table of contents of IRM 4.19.3 shows the recomputation reaches items like the earned income credit, education credits and the qualified business income deduction. But the AUR examiner is not supposed to go hunting through your Schedule A for things that look odd. That is what exam does.

Compare that with an exam, where the examiner can be told the audit "may be expanded to additional issues" right in the scheduling call (IRM 4.10.2.8.2). See audit scope expansion.

2. The year can still be audited

Section 7605(b) of the Code and the regulation at 26 CFR 301.7605-1(h) say only one inspection of a taxpayer's books of account shall be made for each taxable year unless the taxpayer requests otherwise or the IRS notifies the taxpayer in writing that an additional inspection is necessary. Because the IRS treats AUR contacts as not an examination, inspection or reopening, a CP2000 does not use up that one inspection.

So resolving a CP2000 does not mean the year is closed for good. An examination of the same year is still possible while the assessment period remains open. That is not a reason to panic. It is a reason to answer the CP2000 accurately, without overstating or improvising.

3. Exam and AUR talk to each other

If both programs touch the same year, the IRS coordinates. IRM 4.19.13.4.2 tells campus examiners to check for AUR involvement every time they handle an exam case. If an AUR case is open and no statutory notice has gone out, the AUR case can be closed and the underreported issues folded into the exam. If AUR has already issued its statutory notice, the exam may be closed if the issues are the same or suspended until AUR finishes.

What that means for you: if you get a CP2000 and an exam letter for the same year, tell each office about the other in writing. Do not assume they know.

4. The fix-it route after assessment is different

Audit reconsideration under IRM 4.13.1 is the process for reopening an exam assessment. But the IRM's list of requests the Central Reconsideration Unit does not work includes "ASFR or AUR assessments," which are routed elsewhere (IRM 4.13.1.4.9.1). AUR reconsideration requests go to the campus where the assessment originated (IRM 4.13.1.3.2) and are worked under the AUR reconsideration procedures in IRM 4.19.3.27.

The substance is similar: bring information that was not considered. The routing is not. Sending an AUR reconsideration to the wrong office costs months. See what to do after an ignored CP2000 and audit reconsideration.

Penalties and interest work the same way in both

Do not assume a CP2000 is the gentler of the two just because it is not an exam. The AUR manual has its own sections on penalties, including the accuracy-related penalty for a substantial understatement of tax and for negligence (IRM 4.19.3.19.5 and 4.19.3.19.6), and on computing interest for the notice (IRM 4.19.3.19.9). A large unreported 1099 can produce a proposal that looks a lot like an audit report: tax, a penalty line at the 20 percent rate set by IRC 6662(a), and interest.

So the response deserves the same care. If a penalty is proposed and you had a good reason for the mismatch, say so in your response with the facts that support it. The penalty and the tax are separate questions, and you can win one even if you lose the other.

What is the same

Both programs can produce a statutory notice of deficiency. For AUR, that is the CP3219A. For a correspondence exam, it is Letter 3219. Either way, the notice gives you 90 days (150 if addressed outside the United States) to petition the Tax Court, and that period cannot be extended.

Both programs also rest on the same basic rule: the IRS can assess what you owe, and you carry the job of showing why a reported item is wrong or a claimed item is right. In a CP2000 involving a disputed information return, there is a statutory twist worth knowing, IRC 6201(d), which I cover in when the 1099 is wrong. For the general rules, see burden of proof in an audit.

Can a CP2000 turn into an audit?

A CP2000 does not convert into an examination on its own. But the information you send can raise questions, and AUR can refer matters elsewhere. The AUR manual has procedures for fraud referrals and for frivolous arguments (IRM 4.19.3.5.8, 4.19.3.23.11). The IRM also notes that if a taxpayer with an acceptable explanation still wants an interview, AUR resolves the case and tells the taxpayer to contact the local Area Office if they still want one (IRM 4.19.3.23.6).

The practical lesson is simple. Answer the CP2000 about the CP2000. Explain the mismatch with documents. Do not volunteer theories about the rest of the return.

How to use this

• Got a CP2000? Treat it seriously, but recognize its limits. Work the mismatch. Start with how to respond to a CP2000.
• Got an exam letter? Different process, broader scope. Start with correspondence audits or office audits.
• Got both? Get organized, put each office on notice of the other, and consider representation.

A CP2000 is a question about a number. An audit is a question about a return. Know which question you are answering.