IRS Notice of Deficiency (CP3219A): What to Do Next

What CP3219A Is and Why It Matters

CP3219A — sometimes also issued as Letter 3219 — is the Statutory Notice of Deficiency, often called the "90-day letter." It's the IRS's formal determination that you owe additional tax based on a completed examination, and it triggers a hard statutory deadline. You have 90 days from the date on the notice to petition U.S. Tax Court under IRC § 6213(a), or 150 days if you're outside the United States.

The 90-day window is a jurisdictional deadline. Missing it by a single day strips your right to contest the deficiency in Tax Court — the only forum where you can dispute the IRS's position without first paying the tax. After the 90 days expire, the IRS automatically assesses the deficiency and begins collection.

Your Options Inside the 90 Days

First option: pay the proposed deficiency and move on. If the adjustment is correct and small, this avoids the cost of litigation and stops the interest accrual.

Second option: petition Tax Court. Filing a Tax Court petition is procedurally simple — a short form, $60 filing fee, mailed to the U.S. Tax Court in Washington D.C. with a copy to the IRS. Once filed, the case automatically goes to the IRS Office of Appeals before any trial scheduling. The vast majority of Tax Court petitions settle at Appeals without ever reaching a trial calendar.

Third option: respond directly to the IRS within the 90 days to ask for reconsideration of the examination findings. This is informal and doesn't stop the 90-day clock — you should file a protective Tax Court petition if you can't resolve the disagreement well before day 89, or you lose Tax Court rights forever.

Fourth (post-90-day) option: pay the tax in full and sue for refund in U.S. District Court or the Court of Federal Claims. This forum is open even after the Tax Court window closes, but it requires payment first, which most taxpayers facing a deficiency can't manage. Audit reconsideration is also available after assessment if new documentation surfaces.

Receiving an IRS Notice of Deficiency, officially known as CP3219A, can be a disconcerting experience. This notice is a formal communication from the Internal Revenue Service (IRS) indicating that they have determined a tax deficiency in your return, resulting in additional taxes owed. It's crucial to understand the implications of this notice and what steps you should take next to address it effectively. This comprehensive guide will walk you through the essential aspects of the IRS Notice of Deficiency and help you make informed decisions.

Frequently Asked Questions

What happens if I don't respond to the Notice of Deficiency (CP3219A)?

If you take no action within the period stated on the notice — generally 90 days, or 150 days if it was addressed to you outside the United States — the IRS can assess the additional tax and begin collection. Importantly, that deadline is also your window to petition the U.S. Tax Court before paying. Letting it pass means losing the chance to dispute the amount in Tax Court, so it's the one date on the notice you don't want to miss.

Can I negotiate with the IRS after receiving a Notice of Deficiency?

You can still engage with the IRS after a CP3219A arrives. If you have information showing the proposed change is wrong, you can submit it and ask the IRS to reconsider, and disputes that reach the Tax Court are frequently resolved through IRS Appeals before trial. Separately, if you ultimately owe a balance, payment options exist for how it's settled. Because the timeline is tight, it helps to map out your approach with a tax attorney early.

Is it advisable to represent myself when disputing a Notice of Deficiency?

You are allowed to handle a deficiency dispute on your own, and the Tax Court even has simplified procedures for smaller cases. Still, these matters involve strict deadlines, evidence rules, and technical tax law, and a misstep can be costly. Many taxpayers find that having a tax attorney evaluate the notice and the strength of their position helps them decide whether self-representation makes sense for their particular facts.

What if I missed the 90-day deadline on the Notice of Deficiency?

Once the deadline passes, the IRS can assess the tax and you generally can no longer take the case to Tax Court. You still have options, though: you can pay the balance and then file a claim for refund, request audit reconsideration if you have new documentation, or pursue relief through Appeals on collection matters. A tax attorney can review which of these routes remains realistic given what happened with the deadline.

Can I set up a payment plan with the IRS for the additional taxes owed after a Notice of Deficiency?

Yes. Once the additional tax is assessed, you can generally request an installment agreement to pay it over time, and many taxpayers qualify to apply online for balances under the IRS thresholds. Depending on your finances, other resolution options such as an Offer in Compromise may also be worth exploring. Interest and any applicable penalties continue to accrue until the balance is paid, so it's best to address payment arrangements promptly.

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This content was written and reviewed by the licensed tax attorneys at Victory Tax Lawyers, LLP. Our attorneys specialize in IRS tax relief and are licensed members of the California State Bar with a nationwide practice.

Last Reviewed: 2026  ·  Meet Our Attorneys →

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