CP3219A Notice: The IRS Statutory Notice of Deficiency
A CP3219A is the Statutory Notice of Deficiency, or “90-day letter,” that the IRS Automated Underreporter program mails after an unresolved CP2000. Under 26 U.S.C. § 6213(a), a petition to the U.S. Tax Court is due within 90 days of mailing (150 if addressed outside the United States). Without a petition, the tax can then be assessed.
Here a proposed change becomes a legal determination with a fixed court deadline. Drawing on the statute, the Internal Revenue Manual (IRM), IRS pages and Tax Court guidance, this page covers the notice’s contents, the deadline, the petition, the small tax case option, and what follows once the period ends.
Deadline to know: Section 6213(a) allows 90 days after the notice is mailed, or 150 days if it is addressed to a person outside the United States, to petition the Tax Court. Neither the IRS nor the Court can extend that period. A petition filed on or before the last date the IRS printed on the notice is treated as timely.
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What a CP3219A notice is
IRM 4.19.3.2.1.1 calls a CP 3219A “the legal notice in which the Commissioner determines the taxpayer’s tax deficiency,” also known as a SNOD or “90-Day Letter.” It cites IRC 6212, IRC 6213, IRC 6214 and IRC 6215 as requiring this notice before the IRS assesses additional income tax, unless the taxpayer agrees.
Section 6212(a) authorizes the IRS to send it by certified or registered mail and requires it to tell the taxpayer about the right to contact a local office of the taxpayer advocate. Under § 6212(b)(1), mailing to the last known address is enough. For a joint return, § 6212(b)(2) permits a single joint notice, but if either spouse has told the IRS they now live apart, each spouse gets a duplicate original.
Why the IRS page calls it a proposed change
The IRS CP3219A page says the notice “isn’t a bill or audit” and “notifies you of a proposed change in your tax.” That holds in a narrow sense, since nothing is assessed yet; what is new is the statutory clock. The page’s FAQ adds that payer matching “takes several months to complete.”
What comes with the notice
According to IRM 4.19.3.2.1.1, a CP3219A consists of four parts:
- A letter explaining the purpose of the notice, the deficiency amount and the options.
- A waiver that lets the taxpayer agree to the added liability. The IRS page names it Form 5564 (Notice of Deficiency Waiver).
- A computation statement showing how the deficiency was figured.
- An explanation of each adjustment.
The IRS warns that the Form 5564 amount “may not match your prior notice amount due. This is because you can’t challenge all items in U.S. Tax Court.” Section 6213(d) gives every taxpayer the right, by a signed written notice, to waive the restrictions on assessing all or part of a deficiency.
How it differs from the CP2000
The earlier notice is covered in the CP2000 guide. Side by side:
| Point | CP2000 | CP3219A |
|---|---|---|
| Nature | A proposal (Tax Topic 652) | Statutory notice of deficiency under § 6212 (IRM) |
| Time limit | Date on the notice; Topic 652 says 30 days, or 60 outside the United States | 90 days from mailing, or 150 if addressed outside the United States, under § 6213(a) |
| More time | Can be requested (Publication 5181) | “No,” per the IRS FAQ; the period is statutory |
| Agreement document | Response form | Form 5564 |
| If nothing is done | A statutory notice of deficiency (Topic 652) | Assessment and a bill (§ 6213(c), IRS FAQ) |
Counting the 90 days
Section 6213(a) runs the period from the date the notice “is mailed,” and a Saturday, Sunday or legal holiday in the District of Columbia does not count as the last day. The Tax Court’s guidance says the IRS notice usually gives the number of days, that the mailing date “is usually stamped on the notice of deficiency,” and that the notice may also state the last date to file.
The printed date carries legal weight. Section 6213(a) says a petition filed on or before “the last date specified for filing such petition by the Secretary in the notice of deficiency shall be treated as timely filed.” The IRS page puts it plainly: “The Tax Court can’t consider your case if you file the petition late.”
Talking with the IRS does not pause the clock. The IRS page says it will keep working on the case during the 90-day period, “but this won’t extend the time you have to file a petition in Tax Court.”
Electronic and paper filing
The Tax Court says an eFiled petition generally must be received by 11:59 pm Eastern Time on the last day. A paper petition is generally timely if its envelope bears a legible U.S. Postal Service postmark inside the period; the Court calls certified or registered mail, or a designated private delivery service, strong evidence, and says a private meter stamp will not prove timely mailing.
Resolving it with the IRS instead
A petition is not required. The IRS FAQ says the dispute may be settled by replying with Form 5564, documents, and a signed statement naming the disputed items and the reasons. When a payer’s report is wrong, the page says to ask that payer for a corrected document or statement and to tell the IRS while waiting. It adds that the IRS “can generally accept information over the phone.”
If a reply changes the numbers while petition time remains, IRM 4.19.3.21.2 describes a recomputed CP2000D. A CP2000E closes a partly agreed case after that time has expired.
For those who agree, the IRS page says to follow the notice instructions and reply with Form 5564; when other items need reporting, Form 1040-X goes in with Form 5564 and “CP3219A” written at the top. Payment alone is not treated as consent: IRM 4.19.3.22.1 says full payment after a statutory notice “can’t be accepted as agreement to the tax increase,” and IRM 4.19.3.23.13.3 says such cases, lacking the needed signatures, are closed as defaults.
Weighing a Tax Court petition?
An attorney can review the notice, the printed petition date, and the choices the law leaves open before it.
Filing a Tax Court petition
The Tax Court calls itself “an independent judicial forum” that is “not controlled by or connected with the Internal Revenue Service.” A case begins with a petition on the Court’s standard form, T.C. Form 2, eFiled or sent on paper.
- Filing fee. $60 as of October 25, 2026, per the Court’s fees page, waivable for a petitioner who shows an inability to pay.
- Collection on hold. The Court says that once a petition is filed, “payment of the underlying tax ordinarily is postponed until the case has been decided.” Section 6213(a) bars assessment and levy until the decision is final.
- Settlement track. IRM 4.19.3.2.1.1 says the IRS usually sends a petitioned case to Appeals to try to settle before trial, unless the taxpayer already went through Appeals. The Court notes that “Most cases are settled by mutual agreement without trial.” Trials are before one judge, without a jury.
Small tax case (S case) procedure
Section 7463(a) offers a simplified procedure when the deficiency in dispute is no more than $50,000 for any one taxable year, at the taxpayer’s option with the Court’s agreement. Under § 7463(e), penalties count toward that amount; the Court’s case procedure page gives the same limit as of October 2026. The choice is made on line 4 of the petition (unchecked means a regular case), and a qualifying case can switch before trial begins.
The Court lists less formal procedures and relaxed evidence rules (judges “can consider any evidence that’s relevant”). The trade-off is in § 7463(b): an S case decision “shall not be reviewed in any other court and shall not be treated as a precedent for any other case.” This Tax Court limit is separate from the $25,000 small case request Publication 5181 describes for IRS Appeals.
After the deadline passes
Section 6213(c) says that when no timely petition is filed, the deficiency “shall be assessed, and shall be paid upon notice and demand.” The IRS FAQ puts it as “we’ll assess the proposed changes and send you a bill,” and interest accrues until the balance is paid in full.
IRM 4.19.3.2.1.1 notes that the IRS permits reconsideration of examination assessments in some situations, but that without a petition the taxpayer “loses significant administrative and judicial avenues to dispute the IRS’ decision.” For paying an assessed balance, the IRS page mentions a payment plan or offer in compromise. See owing back taxes and installment agreements.
When an attorney matters
The Tax Court allows a taxpayer to file and argue a case without a representative, though an unrepresented petitioner “is still required to abide by the Tax Court Rules of Practice and Procedure.” Anyone who does represent a petitioner “must be admitted to practice before the Tax Court,” and that is where the credentials diverge:
- Attorneys. Rule 200(a)(2) admits an attorney on an application, a fee ($50 per the Court’s practitioner page as of October 2026) and a certificate of good standing executed within 90 calendar days.
- Nonattorneys. Rule 200(a)(3) requires an applicant who is not an attorney to pass a written examination given by the Court, and Rule 200(c) requires two sponsors already admitted. Rule 200 contains no separate route for CPAs or enrolled agents. The exam application fee is $150 as of October 2026.
- Before the IRS. Form 2848 authorizes a person eligible to practice before the IRS; Publication 5181 limits Appeals conference representation to attorneys, CPAs and enrolled agents.
- Privilege. Section 7525 confidentiality for nonattorney practitioners covers only noncriminal tax matters before the IRS and noncriminal tax proceedings in federal court.
The Court also lists tax clinics in its Clinical Program, which have income restrictions. A broader comparison is in the tax attorney vs CPA vs enrolled agent guide.
Related guides
Frequently Asked Questions
Is CP3219A the same as a 90-day letter?
Yes. IRM 4.19.3.2.1.1 says a CP 3219A, Statutory Notice of Deficiency, is also called a SNOD or 90-Day Letter. It is the legal notice the IRS must issue before assessing additional income tax unless the taxpayer agrees.
Can the CP3219A deadline be extended?
No. The IRS FAQ answers that question with “No,” IRM 4.19.3.2.1.1 says IRS employees can’t extend the period, and the Tax Court says it cannot extend the time either. Working with the IRS during the period does not move the date.
What if the notice was addressed outside the United States?
Section 6213(a) allows 150 days instead of 90 when the notice is addressed to a person outside the United States. The IRS CP3219A page mentions only a 90-day period; the statute also treats a petition filed by the last date printed on the notice as timely.
How much does it cost to file in Tax Court?
The filing fee is $60 as of October 2026, per the Tax Court’s fees page. The Court may waive it for a petitioner who shows an inability to pay, using an Application for Waiver of Filing Fee signed under penalty of perjury.
What is an S case?
A small tax case under § 7463, available when the deficiency in dispute, including penalties, is $50,000 or less for any one year. Procedures are less formal, but the decision cannot be appealed and sets no precedent.
Talk through a CP3219A while the petition window is open
A free, confidential evaluation can help clarify the deadline on the notice and the options the law provides.
Ray Neu
Ray Neu is the publisher of IRSAttorneys.net. A former law enforcement officer with a background in criminal justice and digital publishing, he oversees editorial direction, partnership standards, and compliance review for the site. He is not an attorney and does not provide legal advice; all tax law content is sourced and reviewed against the standards documented on the Editorial Team & Standards page.
Sources
- IRS: Understanding your CP3219A notice
- IRM 4.19.3
- 26 U.S.C. § 6212, notice of deficiency
- 26 U.S.C. § 6213, petition to Tax Court
- 26 U.S.C. § 7463, small tax cases
- 26 U.S.C. § 7525
- U.S. Tax Court: Starting a case
- U.S. Tax Court: About the Court
- U.S. Tax Court: Case procedure
- U.S. Tax Court: Court fees
- U.S. Tax Court: Practitioners
- Tax Court Rule 200
- IRS Pub. 5181, reviews by mail
- IRS Topic 652
- IRS: CP2000 series notice
- IRS: Form 2848 page
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Results described on this website are not a guarantee, warranty, or prediction of the outcome of any tax matter. Every situation is different. Prior results do not guarantee a similar outcome. Article content reflects general information about federal tax procedure as of the last reviewed date and may not reflect subsequent changes in IRS policy, regulations, or case law.