IRS CP3219A: Statutory Notice of Deficiency (90 Day Letter)

The short version. A CP3219A is the IRS formal, legal notice that it is proposing additional tax. It usually follows an unanswered CP2000. It gives you one important right: to petition the United States Tax Court within 90 days to dispute the tax before you have to pay it. That 90 day deadline is set by law and is the heart of this notice.

The deadline is the whole point

Everything about a CP3219A turns on the 90 day window. It is a hard legal deadline, not a suggestion.

Within 90 days you can

Petition the U.S. Tax Court to dispute the tax.
Challenge the proposed amount without paying it first.
Keep working with the IRS to try to resolve it.
Agree and sign Form 5564 if the change is correct.

What the deadline means

The 90 days generally cannot be extended.
Talking to the IRS does not pause or extend it.
If you do not petition in time, the IRS assesses the tax and bills you.
After assessment, disputing it becomes much harder.

Why this notice is different from a CP2000

A CP2000 is a proposal you respond to informally. A CP3219A is a legal notice with a court deadline attached. If a CP2000 went unanswered or unresolved, this is what follows. The practical difference is that your main remaining way to dispute the tax without paying it first is a timely Tax Court petition, so the date on the notice matters more than anything else on it.

What you can do about it

Decide quickly whether you agree, and if not, protect your Tax Court option. Each step is part of the normal deficiency process.

Note the petition deadline firstFind the date on the notice and count the 90 days. Protecting that date comes before everything else.
Decide whether the proposed tax is rightCompare it to your records and to any earlier CP2000.
Keep trying to resolve it with the IRSYou can still work it out, but remember this does not extend the 90 days.
Agree and limit the damage if it is correctIf the change is right, signing Form 5564 stops further interest from building on delay.

This one has a court deadline. Do not let it pass.

A CP3219A is the last step before the tax is assessed. Send your case in for a free review and we will tell you how much time you have, whether the proposed tax holds up, and whether this is one to hand to a professional.

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Related IRS notices

Not your notice? Look yours up on the home page.

The legal basis

What this is grounded in

Authority to issue a statutory notice of deficiency: Internal Revenue Code section 6212(a).
Right to petition the Tax Court within 90 days, 150 if outside the United States: Internal Revenue Code section 6213(a).
Statutory notice of deficiency procedures: IRM 8.2.2.
Agree by signing Form 5564. Details in IRS Publication 5181.
Official IRS explanation of this notice: Understanding your CP3219A notice.

These are the controlling Internal Revenue Code sections and Internal Revenue Manual parts. Links go to the live IRS.gov pages so you can confirm every point yourself.

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Got an IRS CP3219A Notice? Here Is What It Means.