First: identify the clock
Before anything else, find the notice number and the dates on it: the notice date, any response date, and for statutory notices the last day printed for a petition or hearing request. Use the notice decoder if the number is unfamiliar. Then sort the notice into one of two groups.
- Statutory clocks are set by the Code. The IRS cannot extend them, and missing them ends a right. The clearest statement is in IRM 4.19.3.2.1.1 for notices of deficiency: the period “is statutory and IRS employees can’t extend it.”
- Administrative clocks are the IRS's own response dates. They can often be extended, and missing them usually moves the case to its next step rather than ending a right. For campus exams, IRM 4.19.13.11.7 says the taxpayer “will be automatically granted an additional 30 days on the first request.”
The clocks side by side
| Notice | Clock | Type | What missing it costs |
|---|---|---|---|
| Notice of deficiency (CP3219A, Letter 3219, Letter 531) | 90 days from mailing to petition the Tax Court; 150 if addressed outside the U.S. (IRC 6213(a)) | Statutory | Prepayment Tax Court review; the deficiency is assessed |
| CDP lien notice (Letter 3172) | 30-day period beginning the day after the fifth business day after the lien filing (IRC 6320) | Statutory | CDP hearing and Tax Court review; equivalent hearing within one year remains |
| CDP levy notice (LT11 / Letter 1058, CP90) | 30 days (IRC 6330) | Statutory | Same as above, with the one-year equivalent hearing window running from the day after the notice date |
| CDP notice of determination | 30 days to petition the Tax Court (IRC 6330(d)(1)) | Statutory | Judicial review of the Appeals determination |
| Letter 1153 (TFRP) | 60 days from mailing or delivery; 75 if addressed outside the U.S. (IRC 6672(b)) | Statutory | Pre-assessment Appeals hearing |
| 30-day letters (525, 950, 915) | 30 days | Administrative | Non-docketed Appeals; the case moves to a notice of deficiency |
| Exam contact (566, 2205) | Date on the letter; 14 days to call on a 2205 | Administrative | Items disallowed in a report, or escalation to Letter 2295 |
| CP2000 | Reply by the date listed | Administrative | A CP3219A notice of deficiency |
| Refund claim disallowance | 2 years from the mailing of the disallowance to sue (IRC 6532(a)) | Statutory | Refund suit |
Two background clocks run under every notice. The assessment statute in IRC 6501 generally requires assessment “within 3 years after the return was filed,” and the collection statute runs from assessment. A short assessment statute explains many IRS requests for Form 872, and it controls Appeals access: IRM 4.10.8.12.1 says a case received in Appeals needs at least 365 days remaining. See the assessment statute, the CSED and the statute date calculator.
Order of operations
- Calendar the deadline the day the notice arrives, using the date printed on the notice for statutory notices. For a notice of deficiency, IRC 6213(a) treats a petition “filed with the Tax Court on or before the last date specified for filing such petition by the Secretary in the notice of deficiency” as timely.
- Get authorized for the right form and periods. A Form 2848 to act, or a Form 8821 to receive information only. Once on file, the IRS sends the representative copies: for field exams, IRM 4.10.2.8.1 says the letter goes to the taxpayer “and a copy of the letter will be mailed to the representative with Letter 937.” See Form 2848 vs 8821 and Tax Pro Account.
- Pull transcripts. The account transcript shows assessments, payments, freezes and the transaction behind the notice; the wage and income transcript shows what third parties reported. See transcripts for practitioners.
- Identify what the IRS actually wants. Payment, documents, a signature, an explanation, or nothing (some notices are informational). Separate tax from penalties and interest; penalties often have their own relief route, such as First Time Abate.
- Check the statute and the client's history. Note the assessment statute date for exam and underreporter notices and the collection statute date for balance due notices. Check for other open years or notices.
- Decide the response and who signs it. Agreement forms (Form 5564, Form 4549, Form 870) are signed by the taxpayer, and both spouses for joint liabilities. IRM 4.19.2.4.6.6.1 instructs AUR that for joint returns both spouses must sign the same CP3219A for the response to count as agreement.
- If the clock is administrative and the response is not ready, ask for more time before the date. Document the request and the answer.
- If the clock is statutory, protect the right first. File the petition or the Form 12153 on time even while working the issue with the IRS. The IRS's CP3219A page puts it plainly: working with the IRS “won’t extend the time you have to file a petition in Tax Court.”
Sending the response
Use the channel the notice gives: the notice address, the fax number, the document upload tool or secure messaging. Include a copy of the notice (or its reply form) on top so the response is associated with the case, the client's name and TIN on every page, and a short cover letter listing the enclosures.
Proof of timely mailing matters most for statutory deadlines. IRC 7502(a) treats a document delivered by U.S. mail after the deadline as filed on the date of the U.S. postmark if the postmark falls within the period, and IRC 7502(c) makes registered and certified mail prima facie evidence of delivery. IRM 8.25.1.4 applies the same principle to TFRP protests: a protest “is considered timely if it is mailed on or before the 60th day (75th if outside of the United States), i.e., timely mailed is timely filed.”
For campus exams, the representative should get copies of IRS letters. IRM 4.19.13.11.1 tells examiners: “The POA must be contacted in lieu of the taxpayer when a valid POA is present.” If letters keep going only to the client, check the CAF record; see CAF numbers and when the IRS contacts the client directly.
When the response is not working
| Problem | Route | Page |
|---|---|---|
| Exam or AUR disagreement before a notice of deficiency | Ask for the manager, then Appeals (written request; Form 12203 if $25,000 or less) | Small case request |
| Response was ignored or the account is stuck | Practitioner Priority Service, then the Taxpayer Advocate Service | Form 911 |
| Collection action other than CDP (lien, levy, installment agreement) | Collection Appeals Program | CAP |
| Notice of deficiency already issued | Petition the Tax Court; docketed cases generally go to Appeals | Tax Court petitions |
| Assessment already made after a default | Audit reconsideration, refund claim after payment, or doubt as to liability offer | Audit reconsideration |
Before a notice of deficiency, IRM 4.19.13.17 describes what campus exam needs to send a case to Appeals: a written request with the changes disagreed and why, the supporting facts and law, and “If deficiency is $25,000 or less, include Form 12203, Request for Appeals Review.” After the notice issues, that route closes for campus cases: “Once a case is in status 24, it cannot be forwarded to Appeals as non-docketed.”
Common mistakes
- Counting from the wrong date. CDP lien deadlines run from the lien filing, not the letter date; notice of deficiency deadlines run from mailing. Use the date printed on the notice.
- Paying instead of agreeing. After a statutory notice, IRM 4.19.3.22.1 says full payment “can’t be accepted as agreement to the tax increase.” Sign the waiver if agreement is the goal.
- Assuming an extension. Confirm any extension of an administrative date and its new due date (SB/SE campuses confirm with Letter 686-B under IRM 4.19.13.11.7). Statutory clocks cannot be extended at all.
- Sending new evidence to Appeals first. IRM 4.10.8.12 notes that new information raised in Appeals generally sends the case back to Examination.
- Letting a short statute surprise the client. Under 13 months, campus exam asks for Form 872 before an Appeals transfer (IRM 4.19.13.17).
- Relying on rescission. IRC 6212(d) allows rescission of a notice of deficiency only by agreement, and IRM 4.8.9.30.3 says it will not be entered into once the petition period has expired.
For intake, the client notice intake form collects the dates and documents this sequence needs.
Questions practitioners ask
Which IRS deadlines can never be extended?
The Tax Court petition period after a notice of deficiency (IRC 6213(a)), the CDP hearing request period (IRC 6320 and 6330), and the 30 days to petition the Tax Court after a CDP determination (IRC 6330(d)(1)).
Does the timely mailing rule apply to IRS notices?
IRC 7502 applies to documents required to be filed within a prescribed period, delivered by U.S. mail after the deadline. Keep the certified mail receipt; registered and certified mail are prima facie evidence of delivery.
Should I call or write?
Call to understand the issue or ask for time; write to create a record of what was sent and when. For anything with a statutory deadline, file in writing.
The client got a notice but I didn't. Why?
The Form 2848 may not cover that form or period, may not be on the CAF, or the notice type may not be copied to representatives. Check the CAF record and the authorization.
What if the deadline already passed?
It depends on the clock: an equivalent hearing for missed CDP dates, audit reconsideration or a refund claim after a defaulted notice of deficiency, or simply a late response for most administrative dates.
When does the Taxpayer Advocate Service help?
TAS helps taxpayers and representatives resolve problems with the IRS when normal channels have not worked; requests go on Form 911. Contacting TAS does not extend the time to petition the Tax Court.