What happens if you ignore a CP2000, and how to avoid it
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What happens if you ignore a CP2000, and how to avoid it
By Tax Letter Desk Updated November 4, 2026
Short answer
If the IRS doesn’t hear from you by the response date, it sends a Statutory Notice of Deficiency, the CP3219A.
Pub 5181 gives 90 days from that notice to petition the Tax Court.
Without a petition, the IRS assesses the changes and sends a bill.
Checked November 4, 2026 against IRS Topic 652 (Oct 16, 2026) , IRS Pub 5181 (Dec 2022) , IRS CP3219A page (Oct 2, 2026) .
In this article
What does the IRS send if I don’t reply?
How long do I have after a CP3219A?
What if I don’t petition?
How do I avoid it?
Do you help with a CP3219A?
Questions
What does the IRS send if I don’t reply?
A Statutory Notice of Deficiency, the CP3219A. Pub 5181 says it comes by certified mail.
It explains how the amount was figured, and how to challenge it in the U.S. Tax Court.
How long do I have after a CP3219A?
Pub 5181 gives 90 days from the date of the notice to petition the Tax Court.
File by the date listed on the notice. The court can’t consider a late petition.
The IRS keeps working with you during the 90 days. That doesn’t extend the court date.
Get your reply ready before the date on your notice.
What if I don’t petition?
If you don’t respond and don’t file a petition, the IRS assesses the changes and sends a bill.
Interest keeps accruing until the balance is paid.
How do I avoid it?
Reply by the response date on the CP2000. Find your reply date
Need more time? Send your extension request with a reply option, or call the number on the notice.
Do you help with a CP3219A?
No. Tax Letter Desk helps with CP2000 replies only.
For a CP3219A, follow the notice. Free help may be available from the Taxpayer Advocate Service or a Low Income Taxpayer Clinic.
Notices we don’t cover
Sources
Topic no. 652, Notice of underreported income, CP2000 IRS, updated October 16, 2026
Understanding your CP3219A notice IRS, updated October 2, 2026
Publication 5181, Tax return reviews by mail (PDF) IRS, revision December 2022
Understanding your CP2000 series notice IRS, updated July 14, 2026
Questions
No. The IRS says it can’t extend the time, but you can still send information as soon as possible.
No. Interest continues to accrue until the amount is paid in full.
Pub 5181 says the Statutory Notice of Deficiency is sent by certified mail.
Related guides
How to respond to a CP2000 notice Pillar guide
CP2000 extension: how to ask for more time Article
CP2000 response deadline calculator Tool