HOW-TO GUIDE
How to Handle an IRS Notice — Complete Response Guide 2026
Step-by-step guide to responding to IRS notices — CP2000, CP14, CP501, LT11, audit notices, and when to involve a tax professional.
IRS Notice Overview: What Every Notice Means
The IRS sends over 200 million notices per year. Most are routine — balance due reminders, requests for information, or proposed changes to your return. But some notices require immediate action and have strict deadlines. The first step when receiving any IRS notice is to identify the notice type and understand the deadline.
Every IRS notice has a notice number in the upper right corner (e.g., CP2000, LT11, CP90). The notice number tells you exactly what the IRS is communicating and what action is required. Never ignore an IRS notice — even if you believe it is wrong, you must respond by the deadline to preserve your rights.
| Notice | What It Means | Deadline | Action Required |
|---|---|---|---|
| CP14 | Balance due — first notice | 21 days | Pay or contact IRS |
| CP501 | Balance due — second reminder | 21 days | Pay or set up payment plan |
| CP503 | Balance due — third reminder | 21 days | Pay or set up payment plan |
| CP504 | Urgent — IRS may levy state refund | 30 days | Pay or contact IRS immediately |
| LT11 / CP90 | Final notice of intent to levy | 30 days | Request CDP hearing (Form 12153) |
| CP2000 | Proposed changes to your return | 60 days | Agree, disagree, or provide documentation |
| CP3219A | Statutory notice of deficiency | 90 days | Pay, agree, or file Tax Court petition |
| Letter 531 | Notice of deficiency (audit) | 90 days | Pay, agree, or file Tax Court petition |
| Letter 525 | Audit report — proposed changes | 30 days | Agree or appeal to IRS Appeals |
| CP75 | Audit — EIC documentation request | 30 days | Provide documentation |
Step-by-Step IRS Notice Response
Step 1 — Read the Notice Carefully: Identify the notice number, the tax year involved, the amount at issue, and the deadline. Write the deadline on your calendar immediately. Read the entire notice — the IRS often includes specific instructions for responding.
Step 2 — Verify the IRS's Information: Compare the IRS's information with your records. For CP2000 notices (proposed changes based on third-party information), compare the IRS's figures with your W-2s, 1099s, and other income documents. For balance due notices, compare with your tax return and payment records.
Step 3 — Determine Your Response: (a) If the IRS is correct — pay the amount owed or set up a payment plan. (b) If the IRS is partially correct — agree with the correct portion and dispute the incorrect portion with documentation. (c) If the IRS is wrong — respond with a written explanation and documentation.
Step 4 — Respond in Writing: Always respond to IRS notices in writing, even if you also call. Send your response by certified mail with return receipt requested — this creates a record of timely response. Include: the notice number and date; your name, address, and Social Security Number; a clear statement of your position; and supporting documentation.
Step 5 — Follow Up: The IRS can take 30–90 days to process responses. If you do not receive a response within 90 days, call the IRS at 1-800-829-1040 to check the status. Keep copies of all correspondence.
Case Study: CP2000 — $8,400 Proposed Deficiency Reduced to Zero
The IRS sent Maria a CP2000 notice proposing $8,400 in additional tax for 2023. The IRS claimed she had unreported income of $32,000 from a 1099-NEC. Maria's practitioner reviewed the notice and determined: the $32,000 was correctly reported on Schedule C; the IRS's automated system had not matched the Schedule C income to the 1099-NEC because Maria had used a slightly different business name. The practitioner responded with a written explanation and a copy of the Schedule C showing the income was reported. The IRS accepted the response and closed the case with no additional tax owed. Response time: 45 minutes. Fee: $350.
Client Conversation Script
Client: 'I got a letter from the IRS. It says I owe $4,200. What should I do?' Practitioner: 'What is the notice number? Look in the upper right corner.' Client: 'It says CP14.' Practitioner: 'That is the first balance due notice. You have 21 days to respond. Let me look at your return and compare it with what the IRS says. If they are correct, we need to pay or set up a payment plan. If they are wrong, we respond with documentation. Either way, do not ignore it — ignoring IRS notices leads to levies and liens. Can you scan it and send it to me today?'
Connect Your Clients with Uncle Kam Tax Professionals
Uncle Kam connects clients with licensed CPAs, EAs, and tax attorneys who specialize in this area.
Apply to Join the Marketplace →Frequently Asked Questions
Read the notice carefully, identify the notice number and deadline, verify the IRS's information against your records, and respond by the deadline. Never ignore an IRS notice. Always respond in writing by certified mail with return receipt requested.
A CP2000 notice is a proposed change to your tax return based on information the IRS received from third parties (employers, banks, brokers). The IRS compares the income reported on your return with W-2s, 1099s, and other information returns. If there is a discrepancy, the IRS proposes additional tax. You have 60 days to agree, disagree, or provide documentation.
A CP2000 is an automated notice generated by the IRS's computer matching program. It is not technically an audit — it is a proposed change based on information returns. An audit (examination) is a more formal review of your return by an IRS examiner. However, if you do not respond to a CP2000, it can escalate to a Statutory Notice of Deficiency (CP3219A), which is a formal legal notice.
A Statutory Notice of Deficiency (SNOD) is a formal legal notice from the IRS that it intends to assess additional tax. You have 90 days to file a petition with the U.S. Tax Court to contest the deficiency without first paying the tax. If you miss the 90-day deadline, you must pay the tax and then file a claim for refund to contest it.
You can call the IRS, but always follow up in writing. Phone calls are not documented — if there is a dispute later, you have no record of what was discussed. Send a written response by certified mail with return receipt requested, even if you also call. Keep copies of all correspondence.
If you cannot pay the full amount, contact the IRS to set up a payment plan (installment agreement). For balances under $50,000, a streamlined installment agreement is available online at IRS.gov. For larger balances, call the IRS or work with a tax professional to set up a regular installment agreement.
Hire a tax professional for: Statutory Notices of Deficiency (90-day deadline, Tax Court petition may be required); Final Notices of Intent to Levy (30-day CDP hearing deadline); audit notices (examination of your return); and any notice involving significant amounts or complex issues. For simple balance due notices, you may be able to handle the response yourself.
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
Tax Clients Are Searching for Specialists on Uncle Kam. Join the Marketplace.
Uncle Kam connects clients with licensed tax professionals who specialize in complex tax situations. Free to join.