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IRS Notice CP3219A: Notice of Deficiency

Notice CP3219A is a statutory Notice of Deficiency — often called the "90-day letter." It is issued when the IRS proposes additional tax and you have either not responded to a prior CP2000 or have disagreed with the proposed changes. CP3219

By Sarah Mitchell·3 min read·Updated April 23, 2026
Critical Urgency
Notice CP3219A is a statutory Notice of Deficiency — often called the "90-day letter." It is issued when the IRS proposes additional tax and you have either not responded to a prior CP2000 or have disagreed with the proposed changes. CP3219A gives you exactly 90 days to petition the U.S. Tax Court before the tax is formally assessed. This is your last opportunity to contest the liability before assessment and collection.

The 90-day Tax Court petition deadline

Within 90 days of the notice date (150 days for taxpayers outside the United States), a petition can be filed with the U.S. Tax Court contesting the proposed deficiency. The properly filed petition stops assessment: the IRS cannot assess the tax or begin collection until the Tax Court case is resolved. Tax Court is a specialized federal court that hears tax disputes pre-assessment, without requiring the disputed tax to be paid first. Petitions have strict format, content, and filing-fee requirements; deficient petitions are dismissed, and the 90-day deadline is statutory — missing it forfeits Tax Court jurisdiction entirely.

Alternatives to Tax Court petition

If you agree with CP3219A, sign the enclosed waiver and return it — this accepts the assessment and moves you into collection. If you partially agree, you can still petition on the disputed portion. If you cannot afford Tax Court litigation, low-income taxpayers can seek help from Low Income Taxpayer Clinics (LITCs), which represent qualifying taxpayers at no cost.

What happens after the 90-day window

If no petition is filed within 90 days, the IRS assesses the tax. You lose the right to pre-assessment judicial review. Post-assessment, your only litigation option is paying the tax in full and suing for refund in U.S. District Court or Court of Federal Claims — a much harder path. Collection begins with CP14 and proceeds through the standard sequence.

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Frequently asked questions

Is CP3219A the same as the 90-day letter?+

Yes. CP3219A is one of the forms of statutory Notice of Deficiency, colloquially called the "90-day letter" because of the 90-day Tax Court petition window.

Do I need a lawyer to file a Tax Court petition?+

No. Taxpayers can represent themselves in Tax Court ("pro se"). For simpler cases under $50,000 per tax year, the small case procedure (S-case) is available and designed for self-representation. More complex cases benefit from professional representation.

Can I negotiate with the IRS after receiving CP3219A?+

Yes. Filing a Tax Court petition typically leads to IRS Appeals review before trial. Many 90-day letter cases settle at Appeals without ever going to trial. Even without filing a petition, you can call the IRS contact listed on the notice.

What if the 90-day deadline is missed?+

Options narrow significantly. The tax will be assessed. Remaining options include paying and suing for refund (in District Court or Court of Federal Claims), pursuing Audit Reconsideration administratively, or seeking relief through other procedures. Each has its own qualifying criteria and procedural complexity. An experienced tax professional can evaluate which post-90-day options are viable for a given situation.

Does the 90-day clock start from the notice date or receipt date?+

The 90-day period runs from the date on the notice, not when you receive it. Review the notice date immediately upon receipt and calendar the deadline carefully. The Tax Court strictly enforces this deadline.

About the author

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Sarah Mitchell

Consumer Affairs Editor · Fresh Start Division Editorial

Sarah Mitchell is the Consumer Affairs Editor at Fresh Start Division. She reports on predatory tax resolution practices, consumer protection, and advocacy for taxpayers navigating the IRS.

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