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Automated Underreporter (AUR) Notice

IRS Notice CP2000: What It Means and How to Respond

An IRS CP2000 is not a formal tax bill or a comprehensive audit. It is a proposed assessment generated by the IRS Automated Underreporter (AUR) computer system when third-party reporting documents (such as Forms 1099-B, 1099-MISC, 1099-K, or W-2) do not match the income reported on your Form 1040.

Statutory Deadline30 Days (60 Days if Outside U.S.)
Governing AuthorityIRC §6213(b) & IRC §6662(d)
IRS Procedure ManualInternal Revenue Manual 4.19.3

The Statutory Risk & Common Pitfall

The AUR computer assumes 100% of reported gross third-party transactions are pure taxable gain. For stock sales, crypto trades, or business revenue, it routinely sets your cost basis and expense deductions to $0.00, resulting in massive erroneous tax calculations.

⚠️ Do Not Ignore Deadlines: Unlike civil disputes, the Internal Revenue Code grants the IRS automatic assessment authority once response windows expire without formal administrative rebuttal.

NoticeFix 5-Point Defense Protocol

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Compare the CP2000 line-by-line against your filed Form 1040 and Schedule 1/C/D.
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Order your IRS Wage and Income Transcript to inspect what third parties reported under your SSN/EIN.
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Check for missing cost basis on Form 1099-B (crypto, brokerage transactions) or unreflected business expenses.
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Do NOT file an amended tax return (Form 1040-X) if the notice instructions explicitly mandate responding directly to the AUR unit address.
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Submit a formal written rebuttal with signed Form 2848 Power of Attorney before the statutory 30-day window expires.

Statutory Questions & Legal Authorities

Is the CP2000 notice an audit?

Technically no. CP2000 notices are handled administratively through the Automated Underreporter program at centralized IRS service centers, not through revenue agent field examinations.

What happens if I ignore the CP2000?

If no response is received by the statutory deadline, the IRS will issue a formal Statutory Notice of Deficiency (90-Day Letter). Once that window lapses, the proposed tax, penalties, and interest are permanently assessed.

Can I abate the 20% accuracy-related penalty?

Yes. Under IRC §6664(c), accuracy-related penalties under IRC §6662 can be eliminated if you demonstrate Reasonable Cause and that you acted in good faith.