CP3219A Notice of Deficiency: The 90-Day Letter Explained

A CP3219A is a Statutory Notice of Deficiency. It is the legal notice the IRS must send before it can assess most additional income tax. It usually follows a CP2000 that was not answered or not resolved. It is not a bill yet, but it is the most time-sensitive notice in this process: it opens your one chance to dispute the tax in the U.S. Tax Court without paying first, and that chance has a hard deadline.

Why you got a CP3219A

The IRS adjusted your income tax based on information from employers, banks or other payers that did not match your return. A CP3219A is sent when:

• You did not respond to a CP2000 or other earlier notice.
• You responded, but the IRS did not accept your explanation, and you did not reach agreement.
• You agreed on only part of the changes, and the rest is still in dispute.

Audits by mail and in person can end with a similar notice under a different number (Letter 3219 or Letter 531). The rules below apply the same way.

What the CP3219A says

Find these items first:

• The notice date. Your time runs from the date the notice was mailed.
• The last day to file a petition with the Tax Court. The law requires the IRS to print this date on the notice. Under the tax code, a petition filed by that printed date is treated as on time.
• The proposed deficiency: the extra tax, plus any penalties, for each tax year.
• Form 5564, Notice of Deficiency – Waiver, which you sign if you agree. The IRS notes that its amounts may not match your earlier notice, because some items (such as interest) cannot be challenged in Tax Court.
• Contact information for the IRS office handling your case.

What to do

Decide quickly which path fits. Whatever you choose, do not let the printed last day pass without acting if you still disagree.

If you agree

Sign Form 5564 and return it by upload, fax or mail as the notice instructs. If you have other income, credits or expenses to report, include Form 1040-X with "CP3219A" written at the top. Pay what you can; interest runs until the balance is paid. If you cannot pay in full, look at payment plans.

If you disagree and have new information

Reply to the IRS right away with a signed statement and copies of your documents. The IRS says it can often take information by phone and will keep working with you during the 90-day period. If a payer's form is wrong, ask the payer for a corrected form and tell the IRS you are waiting for it.

The IRS is clear on one point: working with you does not extend the time to file in Tax Court. If your issue is not settled in writing well before the printed date, the only way to keep your court rights is to file a petition.

If you want to go to Tax Court

You can file a petition with the U.S. Tax Court without paying the tax first. The court explains the process on its website:

• Deadline. The petition must be filed by the 90th day after the notice was mailed, or the 150th day if it is addressed to someone outside the United States. If the last day is a Saturday, Sunday or legal holiday in Washington, D.C., you have until the next business day. Neither the IRS nor the court can extend it.
• How to file. Electronically through the court's DAWSON system (by 11:59 p.m. Eastern time on the last day), by mail, or by hand delivery in Washington, D.C. The court does not accept petitions by fax or email. If you mail it, use USPS certified or registered mail, or a designated private delivery service, and keep the receipt.
• Filing fee. $60 as of 2026, according to the Tax Court. The court may waive it if you cannot pay and file its Application for Waiver of Filing Fee.
• Small tax case ("S case"). If the deficiency in dispute, including penalties, is $50,000 or less for any one year, you can ask for the small tax case procedure. It is less formal and usually faster, but the decision cannot be appealed.
• Privacy. Black out your Social Security number on the copy of the notice you attach, and give the number only on the court's Form 4.

Once you file, an IRS Appeals office normally reviews the case for settlement before any trial. Many cases settle there.

What happens if you ignore it

If you do not agree, do not reach a settlement and do not petition by the printed date, the IRS assesses the tax and sends a bill, usually a CP14. Collection notices follow, which can lead to a levy or federal tax lien. You lose the chance to go to Tax Court before paying. Your remaining options are slower, such as audit reconsideration, or paying and suing for a refund in another federal court.

Is this notice real?

A real notice of deficiency comes by certified or registered mail. Confirm it by checking your IRS Online Account or calling the IRS at a number from irs.gov. The IRS does not ask for gift cards, prepaid debit cards or wire transfers. See our guide to IRS scams.

IRSV.com is an independent guide and is not affiliated with the IRS. This page is general information, not tax or legal advice. Rules change; confirm details on IRS.gov or with a tax professional. Found an error? Tell us.