Understanding IRS and California Tax Notices
Most tax notices are routine and resolvable. A few carry rights that expire — and the difficulty is that they look almost identical to the ones that came before them.
Two federal notices in particular start a 30-day clock, after which the ability to be heard before an independent forum is lost. Both arrive in the same envelope style as several earlier reminders that carried no deadline at all.
This page identifies what each notice means and what it requires. We respond to notices on behalf of clients in Temecula, Murrieta, San Diego, Riverside, and San Bernardino.
The Notices That Carry Deadlines
| Notice | What it is | Deadline |
|---|---|---|
| CP2000 | Proposed changes from information return mismatch | 30 days to respond |
| CP3219A / Letter 3219 | Statutory notice of deficiency — the 90-day letter | 90 days to petition the Tax Court |
| Letter 1058 / LT11 | Final Notice of Intent to Levy and right to a hearing | 30 days to request a CDP hearing |
| Letter 3172 | Notice of Federal Tax Lien filing | 30 days from the fifth business day |
| Letter 950 / 525 | Examination report — the 30-day letter | 30 days to protest to Appeals |
| CP508C | Passport certification for seriously delinquent debt | No appeal window — act to reverse |
The 90-day letter is the most consequential. Petitioning the Tax Court within 90 days preserves the right to contest the liability before paying it. Let it lapse and the deficiency is assessed; the only remaining route is to pay in full and sue for a refund. The deadline cannot be extended for any reason.
The Collection Sequence
Automated collection follows a script, and knowing where you are in it tells you how much time remains:
- CP14 — first balance due notice after a return is processed showing tax owed
- CP501 / CP502 / CP503 — reminders at roughly five-week intervals
- CP504 — Notice of Intent to Levy. Despite the name it permits levy only on state tax refunds. Serious, but not the final step.
- LT11 or Letter 1058 — the Final Notice. This is the one. Thirty days, then wages, bank accounts, and receivables are exposed.
- LT38 — a reminder letter used when automated notices resume after a pause. It is a reminder, not a new legal step, and it does not carry its own appeal right.
A timely CDP request on Form 12153 suspends levy action, moves the case to the independent Office of Appeals, allows collection alternatives to be proposed, permits a challenge to the underlying liability where there was no prior opportunity, and preserves Tax Court review. Filed late, it becomes an equivalent hearing — the same conversation without the judicial backstop.
Notices That Are Frequently Wrong
CP2000 deserves particular attention because it is the most common notice and among the least accurate.
It reflects third-party data with no offsetting items. A brokerage 1099-B reporting $400,000 of proceeds generates a proposed assessment on $400,000 with no basis — even where the securities were sold at a loss. Similarly, 1099-NEC income appears with no business expenses, and 1099-K amounts may include transfers or sales tax collected on behalf of a state.
A CP2000 is a proposal, not a bill. Responding with documentation frequently reduces or eliminates it entirely. Ignoring it converts the proposal into an assessment by default, followed by a 90-day letter.
The same applies to notices arising from substitute for return assessments under IRC 6020(b), where the IRS files for a non-filer using gross receipts with no deductions, no basis, no credits, and single filing status. See unfiled returns.
The Passport Notice
CP508C certifies “seriously delinquent” tax debt to the State Department under IRC 7345. For 2026 the threshold is more than $66,000 in assessed tax, penalties, and interest, with a filed Notice of Federal Tax Lien whose appeal rights have lapsed, or an issued levy.
The State Department will generally not issue a passport and may revoke an existing one. Certification is prevented or reversed by an installment agreement, an accepted offer in compromise, currently not collectible status, or a timely innocent spouse request.
One procedural point that matters: CP508C is sent to the taxpayer only — not to a representative holding a power of attorney. If you have counsel, forward it.
California Notices
California’s notices carry their own deadlines, and they are shorter than the federal equivalents in the case most likely to arise.
- FTB Notice of Proposed Assessment — 60 days to protest; a timely protest suspends collection and preserves the right to contest without paying
- FTB Notice of Action — the protest decision, appealable to the Office of Tax Appeals, generally within 30 days
- FTB Demand for Tax Return — ignoring it produces an assessment computed from gross receipts with no deductions
- CDTFA Notice of Determination — 30 days to file a Petition for Redetermination, after which the liability is final, due, and payable
- EDD Notice of Assessment — petition for reassessment within 30 days, heard by the CUIAB, a different forum from the OTA
Note that the FTB can levy bank accounts without the federal notice sequence — there is no Letter 1058 equivalent and no 30-day CDP right, so a taxpayer waiting for a “final notice” can be levied without ever seeing one. See liens, levies, and garnishments.
Responding
Verify it is genuine. Legitimate IRS notices carry a notice number in the upper right and are sent by mail. The IRS does not initiate contact demanding immediate payment by phone, text, email, or gift card. Verify by calling the IRS directly rather than a number printed on a suspicious letter.
Calendar the deadline immediately, counting from the notice date, not the date received.
Respond to what is actually asked. A CP2000 questioning one item does not invite a general submission of your records.
Do not ignore it. Nearly every irreversible outcome in tax procedure begins with an unanswered notice.
Why Notices Go to the Wrong Address
A recurring and avoidable category of tax disaster begins with notices that were properly mailed and never received.
The IRS sends notices to the taxpayer’s last known address, which is generally the address on the most recently filed return. A taxpayer who moved and did not file in the interim — common for non-filers, and for people going through a divorce, a business failure, or a period abroad — has notices going to a place they left years ago.
The consequences are severe because the deadlines run from the notice date regardless of receipt. A 90-day letter mailed to a former address expires on schedule, the deficiency is assessed, and the first the taxpayer learns of it is a levy. Examination results become final by default in the same way.
The fix is Form 8822 for individuals or 8822-B for businesses, filed on a change of address rather than waiting for the next return. Updating an address with the post office is not sufficient for these purposes, though forwarding helps in practice.
Where notices genuinely never arrived, remedies exist — audit reconsideration can reopen a default examination assessment, and in some circumstances a notice sent to an address the IRS knew was incorrect may be challenged. Neither is as good as having received the notice, which is why the address question is worth handling proactively.
Frequently Asked Questions
Which notices actually have deadlines?
The 30-day letter, the Final Notice of Intent to Levy, the lien filing notice, and the 90-day statutory notice of deficiency. Earlier reminders escalate but do not start an appeal clock.
Does a CP2000 mean I owe the money?
No. It proposes changes based on third-party data without basis or offsetting items. Documentation frequently reduces or eliminates it.
What if I missed the 30 days on a levy notice?
You can request an equivalent hearing — the same discussion with Appeals, without Tax Court review. Collection alternatives remain available.
What is an LT38?
A reminder letter issued when automated collection notices resume after a pause. It restates an existing balance and does not carry its own appeal right, but it usually signals that the automated sequence has restarted.
Is this notice a scam?
Check for a notice number and verify with the IRS directly. Genuine notices arrive by mail and do not demand immediate payment by phone or gift card.
Why did California send a notice when the IRS already closed my case?
The agencies assess independently, and federal adjustments must be reported to the FTB within six months under R&TC 18622. Never reporting leaves California’s window open indefinitely.
Can I just call and sort it out?
Sometimes, for simple mismatches. Where the notice proposes a substantial adjustment, starts an appeal clock, or involves a business or unfiled years, get advice before responding.
Bring the Notice In Early
The date on the notice is usually the most important fact in the file. Bring it in with the envelope if you have it — most matters are considerably more workable at day three than at day thirty-one.
Pietro Canestrelli holds an LL.M. in Taxation and responds to IRS, FTB, CDTFA, and EDD notices on behalf of individuals and businesses. Schedule a consultation, or review our IRS representation and tax relief pages.
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