Got an IRS CP3219A Notice of Deficiency?
The CP3219A, known as the 90-day letter, is the IRS formally proposing to assess additional tax. You have 90 days to petition the U.S. Tax Court, and unlike almost every other tax deadline, this one cannot be extended for any reason.
What a CP3219A actually is
A CP3219A is a Statutory Notice of Deficiency. It is the formal legal step the IRS must take before it can assess additional tax you have not agreed to. Most CP3219A notices follow an earlier proposal, typically a CP2000, that went unanswered or unresolved.
The notice states the additional tax, penalties, and interest the IRS intends to assess, and it explains your right to challenge the determination in the U.S. Tax Court before paying anything.
It is still not a bill. Nothing has been assessed yet. But it is the last structured exit: once the 90-day window closes without a Tax Court petition, the IRS assesses the tax and the matter moves into collections, where your options narrow considerably.
The deficiency is often built on bad numbers
A CP3219A usually inherits its numbers from the automated matching process that produced the original CP2000. That process sees gross proceeds, not your cost basis or deductions. A $20,000 stock or crypto sale can be treated as $20,000 of pure profit, and 1099-K totals can include refunds and amounts that were never taxable income.
In other words, the deficiency being statutory does not make it correct. If the underlying mismatch was wrong, the CP3219A is wrong by the same amount, plus penalties and interest computed on top of it.
You can still send the IRS documentation during the 90-day window, and the IRS may agree to correct the notice. But corresponding with the IRS does not pause the Tax Court deadline. The petition clock runs regardless of how productive your conversation with the IRS feels.
Your deadline: 90 days, no extensions
You have 90 days from the date on the notice (150 days if it is addressed to you outside the United States) to file a petition with the U.S. Tax Court. The last day to file is printed on the notice itself. This deadline is set by statute: the IRS cannot extend it, and neither can you.
Filing a Tax Court petition lets you dispute the tax before paying it. Cases of $50,000 or less per year can use simplified small-case procedures. If you do not petition by the deadline, the IRS assesses the proposed amounts, sends a bill, and collection begins. After that, disputing the numbers generally means audit reconsideration or refund claims, which are slower and weaker positions.
What to do, step by step
- 1
Find your deadline first
The last day to petition the U.S. Tax Court is printed on the notice. Mark it. Every other decision happens inside that window.
- 2
Compare the notice to your records
Match each adjustment against your return, your 1099s and W-2s, and your cost-basis records. Identify exactly which items are right, which are wrong, and what documentation proves it.
- 3
If you agree, sign Form 5564
If the deficiency is actually correct, signing the enclosed waiver (Form 5564) stops the delay and lets you arrange payment. Do not sign it if any part of the proposal is wrong.
- 4
If you disagree, respond with documentation and protect the deadline
You can send the IRS your documentation and ask it to revise the notice. But never let that correspondence run past the petition deadline: if the issue is not fully resolved in writing, file the Tax Court petition before day 90.
- 5
Consider the Tax Court petition seriously
A petition preserves your right to dispute the tax before paying. The filing fee is modest, small-case procedures exist for amounts of $50,000 or less per year, and many petitioned cases settle with IRS Appeals without a trial.
- 6
Get professional eyes on it quickly
A CP3219A is a legal deadline document. Have a qualified professional review the numbers and the strategy early in the window, not in the final week.
CP3219A questions, answered
Flat $199 CP3219A Review
An Enrolled Agent reviews your Statutory Notice of Deficiency against your records, tells you which adjustments are right or wrong, and maps your options against the 90-day deadline so you do not lose your strongest forum by default.
If you decide to have us prepare the response and work the case, the $199 fee is credited toward that representation.
Arc & Ledger is an independent tax and accounting firm. We are not affiliated with, endorsed by, or connected to the Internal Revenue Service or the Taxpayer Advocate Service. Our practitioner is an Enrolled Agent, enrolled to practice before the Internal Revenue Service.
Circular 230 Disclosure: The content on this page is for general informational purposes only and does not constitute tax advice. Viewing this page does not create a practitioner-client relationship. Tax laws change frequently; please consult a qualified tax professional about your specific situation.