What is a CP2000 Notice?

A CP2000 Notice is an IRS notice proposing changes to a tax return because information reported by employers, banks, brokerages, or other third parties does not match information shown on the return.

The notice explains the discrepancy and allows the taxpayer to agree with the proposed change or provide information showing why the filed return is correct.

A CP2000 is not a tax bill or a formal IRS audit. The proposed adjustment may increase tax, decrease tax, or result in no tax change.

The IRS CP2000 series guidance explains how to handle these proposed changes.

The IRS uses a broader CP2000 notice series, including CP2000, CP2000A, CP2000B, CP2000C, CP2000D, and CP2000E.

Taxpayers should follow the instructions printed on the specific notice they receive.

Why Does the IRS Send a CP2000 Notice?

The IRS sends a CP2000 when information reported by third parties differs from the income, payments, credits, or deductions reported on a taxpayer's return.

For example, an employer may report wages that do not match the wages shown on the taxpayer's return.

A bank, brokerage, business, or another payer can create a similar discrepancy through an information return.

The IRS explains this information-matching process in Topic No. 652 - Notice of Underreported Income, CP2000.

How Does the IRS Automated Underreporter Program Detect Differences?

The Automated Underreporter (AUR) program compares information reported on a taxpayer's return with information the IRS receives from third parties.

The process generally follows this relationship:

Third-party information return → IRS matching process → tax return comparison → potential discrepancy → tax examiner review → CP2000

A tax examiner reviews the potential discrepancy before the IRS issues the notice.

Can W-2, 1099, or Other Information Return Differences Trigger a CP2000?

Yes. Differences involving information returns can lead to a CP2000 when information received by the IRS does not match the filed return.

Common information sources include:

Form W-2, Wage and Tax Statement for wages and withholding;
Forms 1099 and other information returns for various types of income and payments;
Form 1098, Mortgage Interest Statement and other 1098-series reporting;
brokerage and investment reporting; and
information submitted by banks, businesses, employers, or other payers.

The reporting problem can originate with the third party rather than the taxpayer. In that situation, the organization that submitted the incorrect information may need to issue corrected information.

What Information Does a CP2000 Notice Show?

A CP2000 identifies the information behind the proposed adjustment so the taxpayer can compare it with their records.

According to IRS Topic No. 652, a CP2000 can show:

Amounts reported on the original or processed amended return;
Amounts reported to the IRS by a payer;
The payer's identifying information;
The information document involved;
Proposed changes to income, tax, credits, or payments; and
Instructions for responding.

The notice also provides the applicable response date and relevant contact information.

Is a CP2000 Notice an Audit or a Tax Bill?

No. A CP2000 Notice is generally neither a formal IRS audit nor an immediate final tax bill.

It proposes a change because information available to the IRS appears inconsistent with the filed return. The taxpayer can review the proposed adjustment and respond before the change becomes final.

A CP2000 doesn’t automatically mean you owe more tax. Resolving the issue could increase your tax, decrease it, or leave it unchanged.

What Should You Do After Receiving a CP2000 Notice?

Review the entire notice and compare each listed item with the tax return and supporting records before responding.

The basic process is:

Review the notice → verify the underlying information → determine whether you agree → submit the appropriate response by the stated deadline

What Happens If You Agree With the CP2000 Changes?

If the proposed changes are correct, complete, sign, and date the applicable response form and return it according to the instructions provided with the notice.

For a jointly filed return, both spouses may need to sign the response. If the adjustment creates an amount due, follow the payment instructions contained in the notice.

Agreeing with a CP2000 doesn’t always mean you must file an amended return.

How Do You Dispute a CP2000 or Correct Incorrect Third-Party Information?

If some or all of the proposed change is incorrect, provide an explanation and documentation supporting the position reported on the tax return.

If an employer, bank, brokerage, or another payer reported the wrong amount, contact that organization and request corrected information.

For example, an employer may need to correct wage reporting associated with a Form W-2, while another payer may need to correct an applicable Form 1099 information return.

The taxpayer should still respond to the IRS by the date shown on the notice.

What If Only Part of the CP2000 Notice Is Correct?

A taxpayer can agree with certain proposed changes while disputing others.

The response should identify which items are accepted and which are disputed and provide supporting documentation for the disputed amounts.

How Can You Respond to a CP2000 Notice?

Depending on the instructions accompanying the notice, the IRS may allow a response through:

The IRS Document Upload Tool;
Fax; or
Mail.

Use the submission instructions printed on the individual notice.

What Happens After the IRS Receives Your Response?

The IRS reviews the taxpayer's explanation and supporting documentation.

That review may result in:

Acceptance of the originally filed return;
Acceptance of the proposed adjustment;
A revised proposed adjustment;
A request for additional documentation; or
Further deficiency procedures if the issue remains unresolved.

If only part of the discrepancy is resolved, the IRS may issue a revised CP2000 reflecting the remaining proposed changes.

Do You Need to File Form 1040-X After a CP2000 Notice?

Receiving a CP2000 does not automatically require an amended return.

If the notice is correct and there are no additional income, credits, expenses, or other items to report, the IRS generally does not require an amended return solely because the taxpayer agrees with the CP2000.

If the CP2000 notice is correct and you have other income, credits, or expenses to report, complete Form 1040-X, Amended U.S. Individual Income Tax Return, write “CP2000” at the top, and submit it with your CP2000 response form and supporting documentation.

Taxpayers should also review prior-year returns for the same reporting issue. If the same discrepancy appears in another year, a separate amended return may be appropriate for that tax year.

How Long Do You Have to Respond to a CP2000 Notice?

Use the response date printed on the notice as the controlling deadline.

IRS Topic No. 652 states that taxpayers should generally respond within 30 days of the notice date, or 60 days if they live outside the United States.

The date printed on the individual notice should always be checked before responding.

What Happens If You Do Not Respond to a CP2000 Notice?

If the taxpayer does not respond by the deadline on the CP2000 notice, the IRS may issue aCP3219A, Statutory Notice of Deficiency.

The CP3219A formally states the proposed tax deficiency and generally gives the taxpayer 90 days to petition the U.S. Tax Court before the IRS assesses the proposed tax.

What Is a CP3219A, Statutory Notice of Deficiency?

A CP3219A is the Statutory Notice of Deficiency that the IRS may issue when a proposed adjustment remains unresolved.

It explains the proposed deficiency and informs the taxpayer of the deadline for filing a petition with the U.S. Tax Court.

The notice is different from the earlier CP2000:

CP2000 → proposes an adjustment and requests a response

CP3219A → formally states the proposed deficiency and provides applicable Tax Court rights

CP2000 Notice Example

Suppose a brokerage reports taxable investment income to the IRS, but the amount does not match the taxpayer's return.

The Automated Underreporter process identifies the discrepancy, and the IRS proposes an adjustment through a CP2000.

If the brokerage information is correct, the taxpayer can accept the proposed change. If the reporting is wrong, the taxpayer can obtain corrected documentation and explain the discrepancy in the response.

Key CP2000 Terms to Know

Term	Meaning in the CP2000 Process
Automated Underreporter (AUR)	IRS information-matching process used to identify potential discrepancies.
Information Return	A form submitted by a third party to report income, payments, or other tax information.
Form W-2	IRS wage and withholding reporting form.
Form 1099	Family of information returns used to report various types of income and payments.
Form 1098	IRS information return used for certain reportable payments, such as mortgage interest.
Underreported Income	Income the IRS believes may not match information received from third parties.
Proposed Adjustment	A change proposed by the IRS before it becomes a final assessment.
Form 1040-X	Amended U.S. Individual Income Tax Return.
Form 2848	Power of Attorney and Declaration of Representative used to authorize an eligible representative.
Form 14039	Identity Theft Affidavit used in applicable tax-related identity theft situations.
Statutory Notice of Deficiency (CP3219A)	IRS notice that formally states a proposed deficiency and provides applicable Tax Court petition rights.

CP2000 Notice FAQs

Can a CP2000 Notice Be Wrong?

Yes. A CP2000 represents a proposed adjustment based on information available to the IRS.

If third-party information or the IRS's proposed calculation is incorrect, the taxpayer can disagree and submit documentation supporting the filed return.

What If the Income Listed on My CP2000 Is Not Mine?

Income that does not belong to the taxpayer may result from incorrect third-party reporting or possible identity theft.

When tax-related identity theft applies, the IRS may requireForm 14039, Identity Theft Affidavit.

Does a CP2000 Always Mean You Owe More Tax?

No. Resolving the reporting discrepancy can result in additional tax, reduced tax, or no change to the taxpayer's liability.

Can a CPA Respond to a CP2000 for a Taxpayer?

Yes. A CPA, enrolled agent, attorney, or other eligible tax professional can help review the discrepancy, research the underlying issue, prepare supporting documentation, and communicate with the IRS when properly authorized.

For representation before the IRS, the taxpayer may useForm 2848, Power of Attorney and Declaration of Representative, when applicable.

Can Penalties and Interest Result From a CP2000 Adjustment?

Yes. If a CP2000 adjustment results in additional tax, applicable penalties and interest may also apply.

Interest generally accrues from the original return due date, without regard to extensions, until the balance is paid in full. Paying the amount due within 30 days of the notice date may help limit additional interest and penalties.