# CP3219A: the notice of deficiency that follows an income mismatch

Source: https://backtaxesdesk.com/irs-notices/irs-notice-cp3219a
Publisher: Back Taxes Desk (backtaxesdesk.com), independent editorial site
Topic: IRS Notices and Letters
Last updated: 2026-09-18

> CP3219A is a Statutory Notice of Deficiency. The IRS compared your return with W-2, 1099 and other reports from employers and banks, found income or payments that do not match, and now proposes a tax increase. You have 90 days from the notice date (150 if addressed outside the US) to petition the US Tax Court, and that deadline cannot be extended.

## Key facts

- What it is: Statutory Notice of Deficiency based on third-party income reports
- Tax Court deadline: 90 days from the notice date, 150 days if addressed outside the US
- Form to agree: Form 5564, Notice of Deficiency Waiver
- Tax Court filing fee: $60, waiver available

## What does a CP3219A mean?

A **CP3219A** is the IRS's formal, legally required notice that it intends to assess more tax for a specific year. It comes out of the automated income matching program, which lines up your return against the W-2s, 1099s and similar forms that employers, banks, brokers and others filed about you. When the figures do not agree and the difference was not resolved earlier, the IRS issues this notice.

The notice is not a bill and it is not an audit. It lists the items that did not match, shows how the proposed tax, any penalty and interest were figured, and explains your choices. Because it is a statutory notice, it also opens your one chance to take the dispute to the US Tax Court before the tax is assessed.

The broader rules for this type of letter are covered in our page on the [IRS notice of deficiency](https://backtaxesdesk.com/irs-notices/notice-of-deficiency); this page focuses on the income-mismatch version and how to answer it.

## CP3219A vs CP2000: how the two notices connect

Both notices come from the same matching program, but they sit at different stages. A [CP2000](https://backtaxesdesk.com/irs-notices/irs-cp2000-notice) is a proposal: the IRS asks you to agree, disagree with documents, or send a corrected return. A CP3219A is usually the next step when a CP2000 went unanswered or your reply did not settle the difference.

| Point | CP2000 | CP3219A |
| --- | --- | --- |
| Legal status | Proposed adjustment | Statutory Notice of Deficiency |
| Tax Court right | No petition right yet | Petition within 90 days (150 abroad) |
| Deadline | Response date printed on the notice | Petition date fixed by law, no extensions |
| Form to agree | Signed response form | Form 5564 |
| If ignored | IRS issues a notice of deficiency | Tax is assessed and billed |

CP2000 compared with CP3219A

The practical difference is the clock. With a CP2000 you are negotiating. With a CP3219A, missing the petition date means the tax is assessed and your remaining options become slower routes such as audit reconsideration or a refund claim after paying.

## The 90-day CP3219A deadline

The notice prints the last day to file a Tax Court petition. Count from the notice date, not the day it reached your mailbox. A CP3219A dated March 2, 2027, for example, carries a petition deadline of May 31, 2027, which is 90 days later. If the notice was addressed to you outside the United States, the window is 150 days.

The IRS will keep working with you during those 90 days if you send documents, but talking to the IRS does not pause the Tax Court clock. If you disagree and the IRS has not accepted your reply by the printed date, file the petition anyway. The court cannot hear a late petition.

> **No extensions:** Neither the IRS nor the Tax Court can extend the petition date on a notice of deficiency. Mark the printed date on a calendar the day the letter arrives.

## Agreeing with the notice: Form 5564

If the changes are correct, sign and return **Form 5564, Notice of Deficiency Waiver**, which comes with the notice. Signing it lets the IRS assess the tax without waiting for the petition period to end. You then receive a bill for the tax, any penalty and interest.

Interest keeps building on the unpaid amount until it is paid in full, so paying early reduces the total. If you cannot pay it all, you can ask for a payment plan once the bill arrives. See [ways to pay back taxes](https://backtaxesdesk.com/back-taxes/how-to-pay-back-taxes) for the payment methods.

### Worked example

Say you forgot a 1099-INT reporting $2,400 of bank interest, and your top bracket for that year was 22%. The proposed tax increase would be about $528 (22% of $2,400), plus interest from the original due date and possibly a penalty if the notice lists one. The notice shows the exact computation for your return.

## Disagreeing with a CP3219A: reply and petition

If you think the IRS is wrong, you have two tracks and can use both at once. The first is a written reply to the IRS with proof. The second is a Tax Court petition, which protects your rights if the reply does not resolve things in time.

1. Compare each listed item with your records and the original forms.
2. If a payer reported wrong figures, ask it for a corrected W-2 or 1099.
3. Write a signed statement explaining which items are wrong and why, and attach copies of your proof.
4. Send it through the IRS Documents Upload Tool (the IRS calls this the fastest option), by fax to the number for your location, or by mail to the address on the notice.
5. If the issue is not settled well before the printed date, file a Tax Court petition with the $60 fee (waiver available), online through DAWSON or on paper.

### What a CP3219A response letter should include

People often search for a CP3219A response letter sample. There is no required wording, but a useful reply covers these points in plain sentences:

- Your name, taxpayer ID number, the tax year and the notice number and date
- Each disputed item, quoted as the notice lists it
- Why it is wrong, such as a duplicate 1099, income already reported on another line, or basis missing from a 1099-B
- A list of the enclosed documents
- Your signature and a daytime contact method

If the income belongs to someone who used your identity, attach Form 14039, Identity Theft Affidavit, to the reply.

### Using the small tax case option

Disputes of $50,000 or less per year can use the Tax Court's small tax case procedure. It is less formal, but the decision cannot be appealed. Our [Tax Court petition](https://backtaxesdesk.com/irs-audits/tax-court-petition) guide walks through the filing.

## What happens if you ignore a CP3219A

When the petition date passes without a petition, the IRS assesses the proposed tax and mails you a bill for the balance, penalty and interest. From there the normal collection sequence applies, described in our [IRS notices guide](https://backtaxesdesk.com/irs-notices).

You can still contest the amount after assessment through audit reconsideration if you have new information and the tax is unpaid, or by paying and filing a refund claim. Both take longer than answering the notice on time.

## Common questions

### What is a CP3219A notice from the IRS?

It is a Statutory Notice of Deficiency issued after the IRS found income or payments on third-party forms that do not match your return. It proposes more tax and gives you 90 days to petition the Tax Court.

### How long do I have to respond to a CP3219A?

The notice lists a specific date, which is 90 days from the notice date, or 150 days if it was addressed to you outside the US. That date is the last day to file a Tax Court petition and cannot be extended.

### Can I still talk to the IRS after a CP3219A?

Yes. The IRS will review documents you send during the 90 days. Contact with the IRS does not stop the Tax Court deadline, so file a petition if the issue is not settled in time.

### What is Form 5564?

Form 5564 is the Notice of Deficiency Waiver that comes with a CP3219A. Signing it means you agree with the proposed changes and lets the IRS assess the tax immediately.

### Is a CP3219A the same as an audit?

No. It comes from automated matching of information returns, not from an examiner reviewing your books. It is a formal notice of proposed tax with Tax Court rights.

### Does interest keep growing after a CP3219A?

Yes. Interest runs on the unpaid balance from the original due date until it is paid in full, whether or not you agree with the notice.

## Sources

- [Understanding your CP3219A notice](https://www.irs.gov/individuals/understanding-your-cp3219a-notice)
- [US Tax Court, starting a case](https://www.ustaxcourt.gov/petitioners_start.html)
- [US Tax Court, case procedure](https://www.ustaxcourt.gov/case-procedure/)
- [Understanding your CP2000 notice](https://www.irs.gov/individuals/understanding-your-cp2000-notice)