A CP2000 notice is typically the beginning of a process, not the end of it. Whether you respond or not, agree or dispute, the IRS generates additional notices at each stage of the process.

Understanding what each follow-up notice means, what it requires from you, and what consequences follow if it is ignored is essential to managing the CP2000 process effectively.

This article covers every major follow-up notice that can arise from a CP2000, in the order they typically appear, along with the required response and what happens if each is missed. Check our associated hub for more on what happens after a CP2000 response. 

Interim Acknowledgment Letters

After the IRS receives a CP2000 response, it sometimes issues an interim letter acknowledging receipt and informing the taxpayer that the matter is under review. These letters are informational only. They do not require action and do not indicate a decision.

Not all CP2000 responses trigger an interim acknowledgment. If you do not receive one, it does not mean your response was not received or is not being reviewed. Verify delivery through your certified mail tracking record if you are uncertain.

Request for Additional Documentation

If the examiner reviewing your dispute needs more information, the IRS will issue a letter requesting specific documents or explanation. This letter will include a response deadline – typically 30 days. This deadline is not as firm as the original CP2000 deadline, but missing it risks the examiner closing the review based only on what was already submitted, which may result in the proposed adjustments being maintained.

Respond to any documentation request promptly and completely. If you need more time, call the number on the letter and request an extension before the deadline.

CP22A: Notice of Change to Your Tax Return

The CP22A is issued when the IRS formally assesses additional tax – either because you agreed with the proposed changes or because an agreed portion of a partial agreement has been assessed. The notice shows:

• The total amount assessed
• Interest that has accrued through the assessment date
• Any penalty assessed
• The total balance due

If you paid with your response, the CP22A should reflect the payment and show a zero or small remaining balance. If not, it is a formal bill. Payment options include IRS Direct Pay, EFTPS, check with the payment voucher, or a request for an installment agreement.

Closing Letter

When the IRS accepts a dispute and determines that no additional tax is owed, it issues a closing letter confirming the resolution. This is the final notice for a successfully disputed CP2000. No response or action is required. File and retain this letter permanently – it is your documentation that the matter is closed.

Revised CP2000

A revised CP2000 is issued when the IRS has accepted part of a response but is maintaining proposed changes on other items. It has the same format as the original CP2000 and carries its own response deadline. You must respond to a revised CP2000 within the stated deadline. Treat the revised notice the same as the original: agree, disagree, or partially agree with documentation for any disputed items.

CP3219A: Statutory Notice of Deficiency

The CP3219A is the most legally significant notice in the CP2000 follow-up sequence. It is issued when:

• You did not respond to the CP2000 within the deadline
• You responded and the IRS did not accept your position
• A 30-day letter was issued and the matter was not resolved

The CP3219A is the Statutory Notice of Deficiency required by Internal Revenue Code Section 6212 before the IRS can formally assess additional income tax. It includes Form 5564 (Notice of Deficiency Waiver) and gives you 90 days (150 days for foreign addresses) to petition the United States Tax Court.

The 90-day petition deadline is jurisdictional – it cannot be extended. If you receive a CP3219A and believe the proposed tax is incorrect, petition the Tax Court immediately or contact a tax professional to evaluate your options. If you agree with the proposed assessment, sign and return Form 5564 to accelerate the assessment.

If the 90-day window expires without a petition, the IRS formally assesses the proposed tax and proceeds to collection.

CP14: Notice and Demand for Payment

After the tax is formally assessed (either through agreement or after the CP3219A window expires), the IRS issues a CP14 – the formal bill and demand for payment. The CP14 shows the full assessed balance including tax, penalties, and interest through the assessment date.

Payment is due within 21 days of the CP14 date. If payment is not made, the collection notice sequence begins.

Collection Notices: CP501, CP502, CP503, CP504

If the CP14 balance is not paid, the IRS sends a series of escalating collection notices:

• CP501: First notice of balance due – reminder of the outstanding amount
• CP502: Second notice – balance remains due; IRS notes the account is past due
• CP503: Third notice – urgent request for payment; notes that further action may be taken
• CP504: Final Notice Before Levy – the IRS notifies you that it may levy your state income tax refund and other assets. This notice also alerts you that the IRS may file a federal tax lien.

These notices arrive at approximately 30-day intervals. None requires a response beyond payment. If you cannot pay, contact the IRS to arrange an installment agreement before collection action escalates.

Letter 1058 or LT11: Final Notice of Intent to Levy

Before the IRS can levy wages, bank accounts, or other assets, it must issue a Final Notice of Intent to Levy and Notice of Your Right to a Collection Due Process Hearing. This notice gives you 30 days to:

• Pay the balance in full
• Request a Collection Due Process (CDP) hearing with IRS Appeals

Requesting a CDP hearing within the 30-day window suspends levy action while the hearing is pending. The CDP hearing allows you to raise collection alternatives (installment agreement, offer in compromise, currently not collectible status) and, in limited circumstances, challenge the underlying tax liability. Missing the 30-day CDP request window converts your right to a “Equivalent Hearing,” which does not suspend levy action.