Step 1: Relax. There Is Still Time to Take Care of This.
Seeing the words Internal Revenue Service on an envelope can be unsettling. It does not automatically mean you are being audited, that you owe the amount shown, or that the IRS is about to levy your bank account. Many notices concern routine issues such as a proposed change, an unpaid balance, a delayed refund, or identity verification. What matters is understanding the specific letter and acting promptly.
Do not ignore it. Some IRS letters have short deadlines, and missing them can limit your ability to dispute a proposed assessment, appeal a collection action, or avoid additional interest and penalties. Even if you cannot pay or do not agree, you may have options.
Step 2: Find the CP or Letter Number
Look near the upper right corner of the first page for a notice number, often labeled CP followed by numbers, or a LTR / Letter number. You can use this identifier to look up the specific notice on the IRS notice and letter information page.
What does CP mean?
CP notices are standardized IRS notices commonly generated through IRS processing and compliance systems. For example, a CP14 generally concerns a balance due, while other CP notices may concern changes to a return, identity verification, or collections. A CP prefix is useful for identifying the notice, but it does not by itself tell you whether the matter is minor or urgent.
What does LTR or Letter mean?
LTR / Letter identifies an IRS letter. Some are sent during examinations, identity-verification procedures, or collection cases, while others are routine. Certain letters can involve an assigned IRS employee or a more advanced stage of a case. But the letter prefix alone does not prove that a person personally wrote it or that enforcement is imminent. Read the actual instructions, deadline, and rights described in the letter.
Important: The IRS's own guidance uses CP and LTR numbers to help taxpayers identify correspondence. The precise notice or letter number—not merely its prefix—is the starting point for understanding what the IRS wants.
Step 3: Read the Entire Letter, Especially the Deadline
Identify the tax year, tax form, reason for the correspondence, proposed adjustment or balance, and what the IRS is asking you to do. Look for a response date, payment date, or appeal deadline. Some deadlines are legally significant, so do not assume that calling after the date will preserve your rights.
If you agree with a notice, follow its instructions; the IRS does not always require a reply. If you disagree, follow the dispute instructions and provide supporting documents. If you cannot pay in full, you may still be able to discuss payment arrangements or other resolution options.
Step 4: Contact the Department or Person Identified on the Notice
Use the telephone number, mailing address, fax instructions, or named contact printed on your specific IRS notice or letter. That information directs you to the department or individual responsible for the matter. A general IRS customer-service number may not be the best way to reach the unit handling your case.
Before calling, have the notice, tax return, supporting records, and any previous correspondence available. Ask what action is required, whether a deadline applies, and how to submit a response. Record the date of the call, the representative's name or ID if given, and any instructions. Verify suspicious correspondence independently through IRS.gov before sharing sensitive information.
Step 5: Decide Whether You Agree, Disagree, or Need More Information
- If you agree: Take the action requested, such as paying, providing documents, or updating your records.
- If you disagree: Respond in writing when instructed, explain why, and attach copies—not originals unless specifically required—of supporting records. Preserve proof of timely submission.
- If you cannot pay: Do not assume there is no solution. Payment plans and other IRS collection alternatives may be available depending on your circumstances.
- If the IRS changed your return: Compare the IRS figures against the return you actually filed and your records before accepting the change.
Step 6: Recognize Notices That Need Especially Prompt Attention
Some correspondence may involve an audit appointment, a proposed deficiency, a summons, a final notice of intent to levy, or notice of federal tax lien filing. These situations can carry important response or appeal deadlines. For example, a statutory notice of deficiency commonly has a 90-day Tax Court petition period (150 days in certain cases), and some collection due process notices have a 30-day hearing-request deadline. Always verify the exact deadline and rules stated in your notice.
Do not wait for a second or third notice. Responding early can help prevent a correctable issue from progressing into assessments or collection action.
Common IRS Notices and Letters: What They Usually Mean
The following is a practical guide, not a complete list. Always read the exact notice and its deadline. A notice can have different consequences depending on your tax account and prior correspondence.
| Notice / letter | Typical purpose | What to check |
|---|---|---|
| CP12 | IRS made a correction to your return that changes your refund. | Compare the IRS adjustment with your filed return. |
| CP14 | Initial bill for unpaid federal taxes. | Balance, payment deadline and whether you disagree. |
| CP23 / CP24 / CP25 | Discrepancy involving estimated tax payments or credits. | Payment records, credits and the IRS calculation. |
| CP49 | Refund applied to another tax debt. | Which tax period received the credit. |
| CP59 | IRS has no record of a required return. | Whether you filed and proof of filing. |
| CP75 / CP75A | IRS is examining certain credits or return items and requests documentation. | Requested evidence and response deadline. |
| CP90 / CP297 | Final notice of intent to levy with hearing rights. | Urgent: levy warning and appeal deadline. |
| CP2000 | Proposed adjustment because third-party income/payment records differ from the return; not itself a bill. | W-2/1099 matching and response instructions. |
| CP3219A / Letter 3219 | Statutory notice of deficiency, often following unresolved proposed adjustments. | Urgent: Tax Court petition deadline. |
| CP501 / CP503 | Reminder notices about unpaid taxes. | Outstanding balance and next collection steps. |
| CP504 | Urgent unpaid-tax notice that warns of levy action, including certain state refunds. | Exact levy language and payment/response date. |
| CP523 | Proposed termination/default of an installment agreement. | Urgent: reason for default and appeal rights. |
| Letter 12C | IRS needs more information to process a return. | Missing forms or supporting documents. |
| Letter 4883C / 5071C / 5747C | Identity verification requested before processing a return. | Use only the verification instructions and official channels. |
| Letter 525 / 566 | Correspondence examination or audit-related request. | Exam issues, documents requested and due date. |
| Letter 1058 / LT11 | Final notice of intent to levy and collection due process rights. | Urgent: hearing request deadline and levy risk. |
| Letter 3172 | Notice of federal tax lien filing and right to a hearing. | Urgent: lien details and hearing deadline. |
For the official explanation of a particular identifier, use the IRS notice lookup or the Taxpayer Advocate Service notice directory. Not every notice is a demand for payment, and not every IRS letter indicates enforcement.
IRS Departments and Offices: Who Is Handling Your Case?
IRS correspondence normally provides the telephone number, address, reply method or employee contact for the unit handling your matter. Use that contact information first; the list below helps explain what different offices do. These are functional descriptions, not a promise that your notice comes from a particular office.
| IRS office or function | Typical responsibility |
|---|---|
| Accounts Management / Customer Account Services | Account questions, payment credits, adjustments, refunds and correspondence. |
| Submission Processing | Processing tax returns, payments and certain return-processing corrections. |
| Automated Underreporter (AUR) | Information mismatches such as CP2000 notices. |
| Examination / Audit | Reviews tax returns and supporting records; may use correspondence, office or field examinations. |
| Automated Collection System (ACS) | Works many delinquent accounts by phone and correspondence, including balances and unfiled returns. |
| Field Collection / Revenue Officers | IRS employees who handle assigned collection cases, often more complex or unresolved matters. |
| Independent Office of Appeals | Considers eligible disputes over examinations, collection actions, penalties and other determinations. |
| Taxpayer Advocate Service (TAS) | Independent organization within the IRS that may assist with unresolved problems or qualifying hardship. |
| Taxpayer Assistance Centers (TACs) | Local in-person taxpayer assistance, generally by appointment; not necessarily the office assigned to your case. |
| Identity Verification / Return Integrity functions | Investigate possible identity theft or questionable return filings and request verification. |
| Offer in Compromise (OIC) units | Review eligible offers to settle tax liabilities for less than the full amount owed. |
| Criminal Investigation (CI) | Investigates potential criminal violations of tax and financial laws; distinct from routine civil notices. |
Important: A notice may be issued by a centralized IRS unit even when you live in California. Do not mail documents to a nearby IRS office unless your notice specifically instructs you to do so. For in-person assistance, use the official IRS Taxpayer Assistance Center locator.
Step 7: Keep Copies and Document Every Response
Save the entire notice, envelope if useful, copies of tax returns, supporting documents, letters you send, proof of mailing or electronic submission, and notes of phone conversations. If you authorize a tax professional to represent you, they may need an appropriate IRS authorization such as Form 2848.
Frequently Asked Questions
Does getting an IRS letter mean I am being audited?
No. IRS correspondence can concern many routine processing, refund, identity, or balance issues. Read the specific notice to learn why it was sent.
Does a CP notice mean it was generated by a computer?
Many CP notices are standardized, system-generated correspondence, but the CP designation is not a reliable standalone test of how the notice was created or how serious it is.
Is an IRS LTR notice more serious than a CP notice?
Not necessarily. Some IRS letters concern serious examination or collection matters, while some CP notices also have significant deadlines. The specific notice number, content, and deadline determine urgency.
Who should I call about my IRS notice?
Start with the contact number or assigned person or department shown on the notice. If the letter seems fraudulent, verify it through the official IRS website or independently obtained IRS contact information.
What if I missed the deadline?
Act immediately. Some options may remain, but certain appeal and court deadlines are strict. Professional review may help identify what can still be done.
Not Sure What Your IRS Notice Means? We Can Help.
You do not have to interpret an unfamiliar IRS notice on your own. D'Ruiz Services in Chula Vista helps taxpayers understand IRS correspondence, review disputed balances and proposed adjustments, prepare responses, and explore representation and resolution options. Roberto E. Ruiz is an Enrolled Agent authorized to represent taxpayers before the IRS.
Call 619-425-9388 and tell us the CP or letter number, the tax year involved, and the response deadline. We can discuss the next step and whether professional representation is appropriate.
1680 Broadway Ave, Suite D, Chula Vista, CA 91911 • English / Español
Source: IRS — Understanding Your IRS Notice or Letter. This page provides general information, not individualized tax or legal advice. IRS procedures and deadlines vary by notice and taxpayer circumstances.