# IRS notices and letters: what each one means and what to do next

Source: https://backtaxesdesk.com/irs-notices
Publisher: Back Taxes Desk (backtaxesdesk.com), independent editorial site
Topic: IRS Notices and Letters
Last updated: 2026-10-20

> An IRS notice is a letter the IRS mails when it needs something from you: payment of a balance, a reply to a proposed change, a missing return, or confirmation that it plans to collect. The notice code, such as CP14 or LT11, sits in the top or bottom right corner and tells you which kind of letter it is and how long you have to act.

## Key facts

- How the IRS first contacts you: By mail, not by phone or email
- Where the notice code is printed: Top or bottom right corner
- Deadline to request a hearing after LT11 or Letter 1058: 30 days
- Deadline to petition Tax Court after CP3219A: 90 days (150 if addressed outside the US)

## What an IRS notice is and why the code matters

An IRS notice is an official letter about your federal tax account. The IRS begins almost every contact by mail, and each letter carries a code: a CP number or an LT or LTR number. That code is the fastest way to know whether you are holding a bill, a warning, a proposed change or a request for information.

Once you know the code, you can look up the IRS explanation page for that notice, which says what the letter means and what response the IRS expects. If you are not sure why the envelope arrived at all, start with [why you got an IRS letter](https://backtaxesdesk.com/irs-notices/why-did-i-get-irs-letter).

> **This site is independent:** Back Taxes Desk is not the IRS. Always confirm a letter against IRS.gov or your IRS online account before paying anything.

## How to read an IRS letter in the right order

Most IRS letters follow the same layout. Reading these parts in order takes a few minutes and tells you nearly everything you need.

1. **Notice code and date.** Look in the top or bottom right corner. The date printed there usually starts the clock for your response.
2. **Tax year and form.** The letter names the year and the return type, such as Form 1040 for 2024. Pull your copy of that return.
3. **Amount.** A bill shows tax, penalties and interest separately. A proposal such as CP2000 shows the change the IRS wants to make.
4. **Response date.** Many notices print a specific date. Others state a number of days from the notice date.
5. **What the IRS wants.** Payment, a signed response form, a missing return or documents.
6. **Where to reply.** The mailing address, fax number or upload instructions printed on the notice.

Keep the original letter with your tax records. The IRS asks every recipient to review the notice carefully and hold on to it, and you will need its code and date when you call, write or upload.

## The balance-due sequence: CP14 to the final levy notice

When you file a return but do not pay in full, the IRS sends a series of IRS notices that grow firmer over time. The first is the [CP14 balance due notice](https://backtaxesdesk.com/irs-notices/irs-notice-cp14). Reminders follow as CP501 and CP503, then a CP504 notice of intent to levy, and then the final notice that gives you a hearing right.

The gap between letters varies, and a letter can be skipped when the IRS moves an account along faster. What stays the same is the direction of travel: each stage adds consequences. After the CP504, for example, the IRS may take a state tax refund, and the failure-to-pay penalty can rise from 0.5% to 1% a month if the balance is not paid within 10 days of a notice of intent to levy.

### Why the early letters are the cheapest to answer

At the CP14 stage you have the most choices and the lowest cost. A short-term plan of up to 180 days has no setup fee for balances under $100,000, and a long-term plan set up online with direct debit costs $29. By the time a final notice arrives, the balance is larger and the IRS can levy wages and bank accounts after the 30-day window closes.

## Enforcement and hearing-rights notices

A handful of letters carry legal weight because they trigger or protect rights. Treat any of these as urgent and note the date printed on the letter.

- **CP504, Notice of Intent to Levy.** Issued under Internal Revenue Code section 6331(d). It allows the IRS to levy a state tax refund, but it does not by itself give Collection Due Process rights. See our [CP504 notice guide](https://backtaxesdesk.com/irs-notices/irs-notice-cp504).
- **LT11 or Letter 1058, Final Notice of Intent to Levy and Notice of Your Right to a Hearing.** You have 30 days from the date of the notice to request a Collection Due Process hearing on Form 12153. Our page on the [final notice of intent to levy](https://backtaxesdesk.com/irs-notices/irs-final-notice-intent-levy) covers the hearing in detail.
- **CP90.** Intent to levy certain assets, plus the right to a Collection Due Process hearing.
- **Letter 3172.** Tells you a Notice of Federal Tax Lien was filed and gives a separate 30-day hearing right; the letter states the date that window ends.
- **CP523.** The IRS plans to end a defaulted installment agreement and levy. Contact the IRS within 30 days of the notice date.
- **CP508C.** Your seriously delinquent tax debt was certified to the State Department, which can deny or revoke a passport. The 2026 threshold is $66,000; the 2027 figure is not yet announced and usually appears with the October or November inflation adjustments.

## Adjustment and deficiency notices

Not every IRS letter is a bill. Some propose a change to a return that is already filed, and they come with a response window instead of a payment due date.

- **CP2000.** Income or payments reported by employers, banks or brokers do not match your return. The IRS calls it a proposal, not a bill. Reply within 30 days of the notice date, or 60 days if you live outside the US. Read our [CP2000 notice explainer](https://backtaxesdesk.com/irs-notices/irs-cp2000-notice).
- **CP3219A, Statutory Notice of Deficiency.** You have 90 days (150 if the notice is addressed outside the US) to petition the US Tax Court, and that deadline cannot be extended. See [CP3219A](https://backtaxesdesk.com/irs-notices/irs-notice-cp3219a).
- **CP11.** The IRS corrected what it sees as a math or clerical error on your return, and you now owe. Ask for a reversal by the date on the notice; you have 60 days. See our [CP11 notice](https://backtaxesdesk.com/irs-notices/irs-notice-cp11) page.
- **CP22A.** The IRS changed your return because you asked it to, and you now owe.
- **CP59.** The IRS has no record of a prior-year return. File it, or explain why you did not need to file.

## IRS notice codes: full list with meanings and deadlines

This table lists the IRS notice codes this site covers, in rough order from first bill to enforcement, followed by adjustment letters. Deadlines come from the IRS explanation page for each notice.

| Notice | What it means | Time to act |
| --- | --- | --- |
| CP14 | First bill for an unpaid balance | Due date printed on the notice |
| CP501 | Reminder that the balance is still unpaid; lien warning | Pay or contact the IRS promptly |
| CP503 | Second reminder; the IRS has not heard from you | Pay or contact the IRS promptly |
| CP504 | Notice of intent to levy under IRC 6331(d) | 30 days from the notice date |
| LT11 / Letter 1058 | Final notice of intent to levy and right to a hearing | 30 days to request a CDP hearing |
| CP90 | Intent to levy certain assets and right to a hearing | 30 days to request a CDP hearing |
| LT16 | Unpaid tax and/or missing returns; enforcement may follow | File and pay, or contact the IRS |
| CP71 | Annual reminder of an unpaid balance | Pay or arrange a plan |
| CP523 | Intent to end a defaulted payment plan and levy | 30 days from the notice date |
| CP508C | Debt certified to the State Department for passport action | Resolve the debt to reverse it |
| CP2000 | Reported income or payments do not match the return | 30 days (60 if outside the US) |
| CP3219A | Statutory notice of deficiency | 90 days (150 if outside the US) |
| CP11 | Math or clerical error corrected; balance due | Date on the notice; 60 days to ask for a reversal |
| CP22A | Return changed at your request; balance due | Due date printed on the notice |
| CP59 | No record of a prior-year return | File now or explain on Form 15103 |

Common IRS notices about balances, changes and enforcement

## How to know an IRS letter is real

Scammers copy the look of IRS letters, so check before you act. The IRS contacts people about taxes by mail first and notifies audits by mail only. A real notice matches a tax year you recognize and asks you to pay the United States Treasury, never a gift card, payment app or private person.

- Sign in to your IRS online account; certain notices appear there and can be viewed and downloaded.
- Check that the notice code exists on IRS.gov and that the letter describes what that page says it should.
- If a private collection agency writes to you, you should first have received IRS Notice CP40. The only agencies the IRS uses are CBE Group, Coast Professional and ConServe, and they cannot ask you to pay them directly.

Our guide to [IRS letter scams](https://backtaxesdesk.com/tax-help/irs-letter-scam) walks through the warning signs in more detail.

## What happens if you ignore an IRS notice?

Ignoring an IRS letter does not pause anything. Balances keep collecting interest, currently 7% a year compounded daily through December 2026 (the January to March 2027 rate is not yet announced and usually comes out in late November). Penalties keep adding up to their caps.

Ignored balance-due letters move toward a filed lien and a levy on wages or bank accounts. An ignored CP2000 becomes a statutory notice of deficiency, and if that deadline passes too, the proposed tax can be assessed and billed. Missed hearing deadlines narrow your appeal options. To guarantee your appeal rights, the IRS says to reply by the due date on the notice. Our step-by-step guide to [responding to an IRS notice](https://backtaxesdesk.com/irs-notices/how-to-respond-to-irs-notice) shows how.

> **Some letters are good news:** Under the Automatic Exemption from Penalty announced on July 8, 2026, eligible taxpayers with a clean compliance history are not assessed failure-to-file, failure-to-pay or failure-to-deposit penalties at all, and the IRS sends a notice confirming the relief.

## Common questions

### Where is the notice number on an IRS letter?

It is printed in the top or bottom right corner of the first page. It starts with CP, LT or LTR, followed by numbers, for example CP14 or LTR 1058.

### Why did I get a notice from the IRS?

The most common reasons are a balance due, a change to your return, a question about something you reported, a missing return, or a need to verify your identity. The notice code tells you which one applies.

### What happens if I ignore an IRS notice?

Interest and penalties keep growing, and the IRS moves to the next, firmer letter. Balance-due letters can end in a tax lien or a levy on wages and bank accounts, and ignored adjustment letters can lead to tax being assessed without your input.

### How do I know if an IRS letter is real?

Compare it with your IRS online account, where certain notices appear, and check that the notice code and wording match the explanation on IRS.gov. Real letters ask for payment to the United States Treasury, never to a person or gift card.

### Do I have to reply to every IRS notice?

No. If you agree with a notice, the IRS says you only need to take the requested action, such as paying, and you do not need to reply unless the letter asks you to. If you disagree, follow the dispute instructions on the notice and include copies of your documents.

### Which IRS letter gives me the right to a hearing?

LT11, Letter 1058 and CP90 give the right to a Collection Due Process hearing before a levy, and Letter 3172 gives it after a lien is filed. You request it on Form 12153 within the 30-day window the letter states.

## Sources

- [Understanding your IRS notice or letter](https://www.irs.gov/individuals/understanding-your-irs-notice-or-letter)
- [Understanding your CP504 notice](https://www.irs.gov/individuals/understanding-your-cp504-notice)
- [Understanding your LT11 notice or Letter 1058](https://www.irs.gov/individuals/understanding-your-lt11-notice-or-letter-1058)
- [Collection due process (CDP) FAQs](https://www.irs.gov/appeals/collection-due-process-cdp-faqs)
- [Topic no. 652, Notice of underreported income, CP2000](https://www.irs.gov/taxtopics/tc652)
- [Failure to pay penalty](https://www.irs.gov/payments/failure-to-pay-penalty)