Audit & Examination Notices

IRS Audit Notices Explained

Understand what each IRS audit notice means, what documentation you need, and how to respond to protect your rights

Understanding IRS Audit Notices

IRS audit notices are sent when the IRS questions specific items on your tax return or finds discrepancies between your return and third-party reports (W-2s, 1099s, etc.). Most audits are handled by mail (correspondence audits), giving you the opportunity to provide documentation and explanations without an in-person meeting.

Documentation Required

Audit notices specify exactly what documents the IRS needs. Gather receipts, bank statements, and supporting records immediately.

30-Day Response Window

Most audit notices give you 30 days to respond. Missing this deadline can result in automatic assessment of proposed changes.

Appeal Rights

If you disagree with the IRS findings, you have the right to appeal to the Office of Appeals before any assessment becomes final.

Common IRS Audit Notices

HIGHCP2000
CP2000 - Proposed Changes to Tax Return

IRS found income discrepancies between your return and third-party reports (W-2s, 1099s)

Deadline:30 days
MEDIUMCP2501
CP2501 - Underreported Income Inquiry

Preliminary notice about potential income discrepancies before formal CP2000

Deadline:30 days
HIGHCP75
CP75 - Earned Income Credit Examination

IRS is examining your Earned Income Tax Credit claim

Deadline:30 days
HIGHCP75A
CP75A - Additional EITC Documentation Request

Follow-up request for more documentation to support your EITC claim

Deadline:30 days
CRITICALLetter 566
Letter 566 - Correspondence Audit Notice

IRS is auditing specific items on your return via mail correspondence

Deadline:30 days
HIGHLetter 525
Letter 525 - General 30-Day Letter

Proposed changes to your return with 30 days to respond or appeal

Deadline:30 days

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