Notice of Deficiency: 90 days, and no extensions exist
The letter that ends the administrative stage. It carries the only window in which you can have a court decide the amount before paying it, and that window is statutory.
THE CLOCK — 90 DAYS — 150 IF THE NOTICE IS ADDRESSED OUTSIDE THE UNITED STATES
Counted from the date of the notice, not from receipt. A petition filed on day 91 is dismissed for lack of jurisdiction regardless of its merits. No IRS employee can extend this and no hardship shortens it.
What this letter is for
Before the IRS may assess most income tax deficiencies, it has to give you an opportunity to have the matter heard by a court that does not require you to pay first. The Notice of Deficiency is that opportunity, and it is the only general one in the system.
It arrives as CP3219A after an unanswered CP2000, or as Letter 3219 at the end of an examination that did not reach agreement. Either way it states a proposed deficiency, explains the basis for it, and encloses a waiver.
Signing the waiver is a real decision, not a formality. It consents to immediate assessment, which ends the 90 days and moves the case into collection. It is the right choice when you agree with the figure and want the account to settle; it is the wrong one if you do not.
The 90 days
The period runs from the date printed on the notice. Mail delay, a wrong address the IRS was never told about, an accountant who did not forward it, illness — none of these extend it. The Tax Court has repeatedly held it has no jurisdiction over a late petition, and jurisdiction is not something a judge may waive out of sympathy.
During the 90 days, and for as long as a timely petition is pending, the IRS may not assess or collect. That protection is automatic and substantial.
The petition itself is short. It identifies the notice, states what you disagree with and why, and asks the court to redetermine the amount. It does not have to be the finished argument. Most petitioned cases are settled with Appeals rather than tried.
PRACTICAL POINTS ABOUT THE PETITION
- The filing fee is modest, and a waiver is available on financial hardship
- Cases of fifty thousand dollars or less per year may elect small tax case procedures — informal, faster, and not appealable
- Filing does not require a lawyer; petitioners may represent themselves
- Most petitions are resolved with the Independent Office of Appeals before ever reaching a courtroom
- The court may find a larger deficiency than the notice proposed, so the underlying position should be sound
If the 90 days pass
The deficiency is assessed and the collection sequence begins with a CP14. What is lost is the right to dispute the amount without first paying it.
Two routes remain. Audit reconsideration asks the IRS to reopen the assessment on the basis of information it has not previously considered — genuinely useful where records exist that were never supplied, and entirely discretionary. Or you pay the tax, file a claim for refund, and if the claim is denied, sue in a district court or the Court of Federal Claims.
There is one further consequence that matters later. Where a deficiency notice was issued for a period, you generally cannot dispute the underlying liability for that period at a collection due process hearing. The opportunity has already been given.
Notices sent to an address you no longer use
The statute requires the notice to be sent to your last known address, which the IRS takes from the most recently filed return unless it has been told otherwise in the form it requires.
A notice properly sent to that address is valid whether or not it reached you. Someone who moved and filed a change of address only with the postal service, or who has not filed a return for several periods, can lose the 90 days without ever seeing the envelope.
Where a notice genuinely was not sent to the last known address, that is an argument with substance. It is also an argument better made early than after a levy.
Where this comes from
The statutes behind this page, so you can check any of it rather than take it on trust.
- IRC §6212
- Authorizes the notice and requires it to be sent to your last known address.
- IRC §6213(a)
- The 90-day period, and the bar on assessment or collection while it runs and while a timely petition is pending.
- IRC §6214
- The Tax Court's authority to redetermine the deficiency — including, in some cases, to find a larger one.
- IRC §6511
- Governs the alternative route: pay, claim a refund, and sue. The claim has its own deadlines.
This page explains what the IRS or the Massachusetts Department of Revenue does and cites the statute. It is not advice about your situation, which depends on facts none of this knows. Tell us what your letter says and what date is on it. Please do not send Social Security numbers or tax documents through the form.
Notice CP2000
An automated comparison found income reported to the IRS that does not appear on your return. The proposed tax is frequently much larger than the correct answer, because the computer does not know what anything cost you.
Audit reconsideration
A discretionary process for reopening an assessment where the IRS has information it has not previously considered. It is the main remaining route once the 90-day Tax Court window has passed.
Audit and examination letters
Most examinations are conducted entirely by mail about a single line on a return. The letter number tells you which kind you have, and that determines almost everything about how it should be handled.
Collection due process
An independent review of a proposed levy or a filed lien, with judicial review behind it. It is the strongest procedural right in collection, and it is available in a 30-day window that most people miss.
Questions about notice of deficiency.
- Can the IRS extend the 90 days if I ask?
- No. The period is set by statute and no IRS employee has authority to extend it. Correspondence with the IRS during the 90 days does not pause it either, which is a common and expensive misunderstanding.
- I petitioned. Does the IRS stop collecting?
- Yes. Assessment and collection are barred while a timely petition is pending. That protection is one of the main practical reasons to file.
- Do I need a lawyer to petition the Tax Court?
- No. Petitioners may appear for themselves, and small tax case procedures for smaller amounts are designed to be usable without counsel. Whether you should is a different question and depends on the amount and the issue.
- What if I agree with part of it?
- Petition anyway, on the part you dispute. Partial agreement is normal and gets resolved with Appeals. Signing the waiver because most of it is right gives away the part that is not.
- I found the notice after 90 days had passed.
- Then the Tax Court route is gone and the practical options are audit reconsideration, which is discretionary and depends on having documents the IRS has not seen, or paying and claiming a refund. Move quickly on either, because collection is now running.
- Does this notice mean I did something wrong?
- It means the IRS and your return disagree about an amount, and the disagreement was not resolved earlier in the process. A significant share of these are documentation problems rather than substantive ones.
Tell us what the letter says and what date is on it.
Scope and price in writing before anything starts. Where what you need is something we do not do, you will be told that instead.
Please don't send Social Security numbers or tax documents through this form.