Updated October 19, 2026. Quick answer: A CP3219A is a notice of a proposed change to your tax based on information from employers, banks and others. It is not a bill or an audit. You have a 90 day response period: reply with Form 5564 if you agree, reply right away with information if you disagree, or file a petition in U.S. Tax Court by the date on the notice. The IRS cannot extend the petition deadline.
Quick reference
| Item | As the IRS describes it |
|---|---|
| What it is | A notice of a proposed change in your tax (statutory notice of deficiency) |
| Is it a bill or audit? | Neither |
| Response period | 90 days |
| If you agree | Reply with Form 5564, Notice of Deficiency, Waiver |
| Tax Court | File a petition by the date listed on the notice |
| Extensions | None; the IRS cannot extend the time to file a petition |
| Time to allow for an IRS reply (Tax Topic 651) | At least 30 days |
| Petition deadline can be extended | No; it cannot go beyond the original 90 days (Publication 5181) |
| Amend later: generally within (Form 1040-X instructions) | 3 years of filing the original return, or 2 years of paying the tax, whichever is later |
What the notice says
“The notice isn’t a bill or audit. It notifies you of a proposed change in your tax.” It explains the calculation, what to do if you agree or disagree and “how you can challenge the decision in U.S. Tax Court if you choose.”
If you agree
“Follow the notice instructions on how to respond. Reply to us with the enclosed Form 5564.” The IRS notes the amounts on Form 5564 may not match the earlier notice because not every item can be challenged in Tax Court.
If you disagree
“Reply to us right away. We’ll work with you to resolve your issue during the 90-day response period.” The IRS adds “You also have the right to file a petition with the U.S. Tax Court if you feel you need to.”
Send your information and a signed statement; the IRS says it can generally accept information by phone. If the information others reported is wrong, “Contact the business or person who reported the information.” and ask for a corrected document.
The Tax Court deadline
“File your petition by the date listed on the notice. The Tax Court can’t consider your case if you file the petition late.”
Working with the IRS does not stop that clock: “We’ll work with you to resolve your issues during the 90-day period, but this won’t extend the time you have to file a petition in Tax Court.” The IRS says it cannot grant an extension of the time to respond or to file a petition, and that if it hears nothing and no petition is filed, “we’ll assess the proposed changes and send you a bill.”
Identity theft and amended returns
If someone else is using your name and Social Security number, include a completed Form 14039 with your reply. To report other income, the IRS says to complete Form 1040-X, write CP3219A at the top and send it with Form 5564. Compare CP2501 and CP2000, the earlier notices.
If you need to correct the return yourself later
The Form 1040-X instructions give the time limit: “Generally, for a credit or refund, you must file Form 1040-X within 3 years (including extensions) after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.” See Form 1040-X for the form itself.
The 90 days in Publication 5181
The IRS publication on these reviews repeats the deadline: “You have 90 days from the date of the notice to petition U.S. Tax Court for a determination on the proposed liability”. It adds “The time to file a petition can’t be extended beyond the original 90 days.”
Where this comes from
The IRS page read for this page is the one titled Understanding your CP3219A notice on irs.gov, as served on 2026-10-19. Your own notice controls: the dates, amounts and phone or fax numbers on it are the ones to use, and the IRS can update its page after we read it.
For IRS notices in general, Tax Topic 651 says “You should allow at least 30 days for a reply from the IRS.” It also says “Keep a copy of all IRS correspondence for your tax records.”
Common mistakes
- Treating the notice as a bill and ignoring the Tax Court date. A late petition cannot be considered.
- Waiting for the IRS to finish talking before you decide about Tax Court. Working with the IRS does not extend the petition deadline.
- Asking for an extension. The IRS says it cannot extend the time to file a petition.
- Skipping Form 5564 when you agree.
Related: IRS Notice CP2501, the CP2000 notice, and IRS notices and letters.
Sources
- IRS, Understanding your CP3219A notice (irs.gov): https://www.irs.gov/individuals/understanding-your-cp3219a-notice
- IRS Publication 5181 (12-2022), Tax Return Reviews by Mail: CP2000, Letter 2030, CP2501, Letter 2531: https://www.irs.gov/pub/irs-pdf/p5181.pdf
- Instructions for Form 1040-X (Rev. December 2025), Amended U.S. Individual Income Tax Return: https://www.irs.gov/pub/irs-pdf/i1040x.pdf
- IRS, Tax Topic 651, Notices: what to do (irs.gov): https://www.irs.gov/taxtopics/tc651
Read from the IRS pages linked above on October 19, 2026. General information, not tax or legal advice. Your own notice and facts decide the outcome, and the number printed on your notice is the right place to confirm anything consequential.