What Is CP3219A?

CP3219A is a statutory notice of deficiency associated with proposed return changes, often following an unresolved CP2000. It provides an opportunity to petition the U.S. Tax Court before paying the disputed deficiency.

Find the Last Day to Petition

The period is generally 90 days from mailing, or 150 days when the notice is addressed to a person outside the United States. Locate the last date printed on your notice and verify the applicable filing rules. The Tax Court's starting-a-case guidance explains how to begin.

Do not rely on an extension or on equitable tolling to rescue a late filing. Questions about a late or defective notice require case-specific advice. Preserve the envelope as well as the notice.

Can You Still Respond to the IRS?

Yes. The IRS CP3219A instructions expressly allow you to submit information and work toward resolution during the response period. The administrative conversation is not automatically over.

That conversation does not extend the Tax Court deadline. Sending documents to the IRS is not the same as filing a petition with the Court. If the dispute remains unresolved, protect the court-filing deadline rather than waiting for an IRS reply.

What If You Agree?

Follow the notice's response instructions, including any enclosed Form 5564. Understand what you are agreeing to before signing a waiver. If only some items are correct, identify the disputed items and obtain advice about preserving the appropriate rights.

Organize the Dispute

  • Keep the complete CP3219A and its envelope.
  • Gather the earlier proposal, your response, and delivery confirmations.
  • Match each disputed adjustment to a return line and supporting document.
  • Write down the petition deadline separately from your planned IRS follow-up date.
  • Keep any court filing receipt and subsequent orders.

When to Get Help

Seek prompt review if the deadline is close, the notice arrived late, several years are involved, or you are unsure which amounts you can contest. Do not wait to collect every document before asking about the filing deadline.

If your notice says CP3219N, use that guide instead: it concerns a nonfiler determination, not the same underlying process as CP3219A.