IRS & CT DRS Tax Letters Explained › CP3219A
IRS CP3219A Explained: Notice of Deficiency and Your Tax Court Deadline
By Andrew Nocera, Tax Preparer & Small-Business Finance Consultant, Enhance Finance LLC (serving all of Connecticut from Shelton). Updated November 2026.
A CP3219A says the IRS plans to change your tax because income reported by employers, banks or others doesn't match your return. It isn't a bill or an audit, but it sets a firm deadline that can't be extended. Read this one the day it arrives.
IRSRespond directly| What it is | A proposed tax change from income-report mismatches, with Tax Court rights. Not a bill. |
|---|---|
| Deadline | Reply by the date listed. Tax Court petition by the date listed; it can't be extended. |
| Official page | IRS: Understanding your CP3219A notice |
What the CP3219A is
The IRS says it found your income tax "needs to be adjusted because of information we received from others like your employer or bank." It adds: "The notice isn't a bill or audit. It notifies you of a proposed change in your tax. It explains how the amount was calculated, what to do if you agree or disagree and how you can challenge the decision in U.S. Tax Court if you choose."
The notice comes with Form 5564, Notice of Deficiency - Waiver. The IRS warns the amount on Form 5564 may not match a prior notice "because you can't challenge all items in U.S. Tax Court."
Why you got it
- A W-2, 1099 or other income form (including from payment apps or online marketplaces) wasn't on your return, or the amount differs.
- You may have had an earlier CP2000 about the same issue. (See the CP2000 summary.)
- The information someone reported is wrong, or someone used your identity.
If it seems late, the IRS explains that matching returns against information from employers, banks and others "takes several months to complete."
Deadline
If you don't respond and don't file a petition, the IRS says it will "assess the proposed changes and send you a bill." Interest accrues on the unpaid balance until it's paid in full.
What to do, step by step
- Write down the dates on the notice: the reply date and the Tax Court petition date. Put them on your calendar today.
- Compare each item the IRS lists with your records and income forms.
- If you agree: follow the notice instructions and reply with the enclosed Form 5564. If you also have other income, credits or expenses to report, the IRS says to complete Form 1040-X, write "CP3219A" on top, and send it with Form 5564.
- If you disagree: reply right away with a signed statement explaining which items you disagree with and why, plus your documents. The IRS says it can generally accept information over the phone at the number on the notice.
- If the payer's report is wrong: ask the business or person who reported it for a corrected form or a supporting statement, and tell the IRS you're waiting on it.
- Identity theft? Reply with a completed Form 14039, Identity Theft Affidavit.
- Send your reply by the IRS document upload tool, fax or mail, as the notice and the IRS page describe.
- If you choose Tax Court, file the petition by the date on the notice. The IRS points to the U.S. Tax Court's guidance for taxpayers.
- Check prior years for the same issue. The IRS says to file an amended return for those if they have it too.
Common mistakes
- Treating it like any other letter. The Tax Court date is firm.
- Thinking talks with the IRS pause the Tax Court clock. The IRS says they don't.
- Signing Form 5564 when you disagree. Form 5564 is the reply for agreeing.
- Replying without documents or a signed statement.
- Fixing this year and forgetting prior years with the same issue.
When to get help
Respond directly to the IRS by the dates on the notice. If you're thinking about a Tax Court petition, or the amount is large, consider an enrolled agent, CPA or attorney. If you agree with the change and just need help understanding the math, gathering your 1099s and other records, or arranging payment, we can help with that. The IRS lists payment plans as an option (IRS: Payment plans).
General information, not advice for your situation. Not tax, legal, investment, or insurance advice. Agency rules and procedures change; always follow the instructions and dates on your own notice and check the official sources below.
Frequently asked questions
Is a CP3219A a bill?
No. The IRS says the notice is not a bill or an audit. It notifies you of a proposed change to your tax and explains how you can challenge it in U.S. Tax Court. If you do not respond or petition, the IRS will assess the change and send a bill.
Can I get more time to respond to a CP3219A?
No. The IRS says it cannot extend the time you have to respond or to file a Tax Court petition. It will work with you during the 90-day period, but that does not extend the petition deadline.
Do I have to go to Tax Court?
No. The IRS says you may be able to resolve the dispute with it. Reply with Form 5564 and your documents, plus a signed statement explaining which items you disagree with and why.
What is Form 5564?
Form 5564, Notice of Deficiency - Waiver, comes with the CP3219A. You reply with it if you agree with the proposed changes. The IRS says the amount on it may not match an earlier notice.
Will I owe interest?
If your tax goes up, yes. The IRS says interest accrues on the unpaid balance until you pay it in full.
Sources (checked November 10, 2026)
- IRS, Understanding your CP3219A notice (not a bill or audit, Form 5564, reply by date listed, Tax Court petition date, 90-day period, no extensions, how to reply, Form 1040-X, Form 14039): www.irs.gov
- IRS, Understanding your CP2000 series notice: www.irs.gov
- IRS, Payment plans (installment agreements): www.irs.gov
Got a CP3219A you agree with, but need the numbers and payment sorted? Talk it through with a Connecticut tax preparer.