What Is IRS Notice CP3219A?

The CP3219A — also called a Statutory Notice of Deficiency or a "90-day letter" — is one of the most legally significant notices the IRS sends. It means the IRS has proposed an additional tax assessment (typically following a CP2000 that you either ignored or disagreed with) and is giving you a formal opportunity to challenge the assessment in U.S. Tax Court before the IRS can collect it.

The 90-day deadline in the name is critical. You have exactly 90 days from the date of the notice (150 days if you're outside the U.S.) to file a petition with the U.S. Tax Court. If you don't petition the Tax Court within that window, the IRS automatically assesses the proposed deficiency and begins collecting it — at that point, your options to dispute the underlying amount become much more limited. The 90-day period is a strict statutory deadline; courts cannot extend it, and the IRS cannot waive it.

If you file a Tax Court petition within the 90-day window, you'll have the opportunity to present your case — either through the Tax Court's simplified small case procedure (for cases under $50,000) or through formal Tax Court litigation. Many Tax Court cases settle before trial through negotiation with IRS counsel. Filing a petition doesn't mean you have to go to trial; it gives you a structured forum to resolve the dispute.

Even if you don't want to go to Tax Court, filing a petition can create time and leverage for negotiation. However, if you agree with the proposed deficiency, you can simply pay the amount and the IRS will not assess it through the formal process. If you can't pay the full amount, you can still explore installment agreements or an Offer in Compromise for the confirmed amount. Given the strict 90-day deadline and the complexity of Tax Court procedures, receiving a CP3219A is a strong signal to consult a tax professional immediately if you disagree with the proposed assessment.