IRS CP3219A Notice: Statutory Notice of Deficiency (90-Day Letter)
A CP3219A is the Statutory Notice of Deficiency — the IRS's formal determination that you owe additional tax, giving you exactly 90 days to petition the U.S. Tax Court before the tax is assessed.
Deadline calculator
The CP3219A clock runs from the date printed on the notice — not the day you opened it.
Estimate only, based on the standard 90-day CP3219A window. Your notice controls — always use the specific date printed on it.
What a CP3219A actually means
This usually follows an unanswered CP2000 or audit. It's the legal turning point: after 90 days, the proposed tax becomes a real assessed debt and collection begins.
Petitioning Tax Court sounds drastic but is often just leverage — most petitions settle with IRS counsel or appeals without a trial, and filing preserves your right to dispute without paying first. Alternatively, you can still submit documentation to the IRS during the window and ask them to reverse the deficiency.
How to recognize a real CP3219A
The IRS Automated Underreporter program sends the CP3219A by certified mail when a CP2000 proposal wasn't resolved. It is based on information from employers, banks, and other payers, and it is the legal notice of deficiency that gives you the right to go to the U.S. Tax Court before the tax is assessed.
- It is titled Statutory Notice of Deficiency and arrives by certified mail. It is also called the 90-day letter.
- It includes Form 5564, Notice of Deficiency - Waiver. The IRS warns that the amounts on Form 5564 may not match your earlier notice.
- It shows the last day to petition the Tax Court. That's 90 days from the notice date, or 150 days if the notice is addressed to someone outside the United States.
- It explains the proposed changes to your income or credits and how the IRS calculated the new tax.
- It lists ways to reply to the IRS (document upload tool, fax, or mail), which are separate from filing a petition with the Tax Court.
What to do, step by step
- 1Calendar the 90-day deadline (it's printed on the notice) — no extensions exist.
- 2If the IRS is simply wrong, immediately send documentation to the address on the notice and ask for a corrected (rescinded) notice — but don't let this run out your clock.
- 3To preserve all rights, file a Tax Court petition before day 90 (the filing fee is modest and cases usually settle).
- 4If the deficiency is correct, you can sign the waiver (Form 5564) to limit interest accrual and arrange payment.
- 5Get professional help — this letter has the most rigid deadline in tax procedure.
Illustrative example
Example: Using the 90 days on two tracks at once
Illustrative scenario: Ben ignored a CP2000 about $22,000 in 1099-NEC income from a side job. On June 2 a CP3219A arrives by certified mail proposing $6,100 in tax plus penalties, with August 31 printed as the last day to petition. Ben did report the income, on Schedule C, under his business name, with $9,000 of expenses.
He works on two things at once. In June he uploads a signed statement, his Schedule C, and the 1099-NEC to the IRS, showing where the income was reported. He also puts a reminder on his calendar for mid-August. When the IRS still hasn't answered by then, he files a petition online with the Tax Court, which the court must receive by 11:59 p.m. Eastern on August 31, pays the $60 filing fee, and attaches the notice.
In September the IRS accepts his documents and the Tax Court case is settled with no extra tax. If Ben had relied only on his reply to the IRS and the IRS had been slow, he would have missed the petition deadline. Replying to the IRS does not extend the deadline to petition the Tax Court.
Names and numbers are made up to show how this notice typically plays out.
Mistakes that make a CP3219A worse
- Sending the petition to the IRS. The petition goes to the U.S. Tax Court, not the IRS, and the court must receive an electronic filing by 11:59 p.m. Eastern Time on the last day.
- Assuming that talking with the IRS stops the clock. The Taxpayer Advocate Service and the IRS both say that working with the IRS does not extend the petition deadline, and the Tax Court can't extend it either.
- Signing Form 5564 without checking it against the CP2000. The amounts may be different. Signing agrees to the assessment and gives up the right to go to Tax Court.
- Not filing because of the court fee. The filing fee is $60, and the Tax Court accepts an Application for Waiver of Filing Fee if you can't pay.
- Letting interest build while you dispute it. Publication 5181 explains you can stop interest by paying the proposed amount and labeling it a "6603 deposit," with a copy of the notice attached.
What happens if you ignore a CP3219A
If there's no agreement and no Tax Court petition by the last day shown, the proposed tax is assessed with penalties and interest, and the IRS sends a bill. The Tax Court can't hear a late petition, so you would have to pay first and claim a refund, or ask for audit reconsideration.
Often comes before a CP3219A
Can come next
Common questions
Can I still fix things after a 90-day letter without going to court?+
Yes — the IRS can rescind or correct a Notice of Deficiency if you provide convincing documentation during the window. But documentation alone doesn't stop the 90-day clock; only a Tax Court petition preserves your pre-payment appeal rights.
What happens after 90 days if I do nothing?+
The tax is assessed, bills begin (CP14), and the collection sequence follows. Your only remaining dispute path is paying first and suing for refund, or audit reconsideration — both harder than acting in the window.
Checked against IRS primary sources — see how we source these guides. You can verify any notice directly at IRS.gov. The dates and instructions printed on your specific notice always control. Official IRS explanation: Understanding your CP3219A notice (IRS).
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