IRS Audit and Notice Response Checklist
Overview
When you receive an IRS notice questioning your tax return, understanding what type of notice you received determines your response strategy. The IRS uses different processes: CP2000 notices are automated underreporter inquiries (not audits), while CP75 notices and examination letters are actual audits conducted by IRS examiners. This checklist applies to individuals who have received their first notice from the IRS and have not yet received a final determination, a statutory notice of deficiency, or a collection notice.
Who This Checklist Is For
This checklist applies if you:
● You received a CP75 audit notice, an examination letter, or a CP2000 underreporter notice from the IRS.
● The notice clearly identifies the specific tax years and items under review.
● You have not yet received a 90-day statutory notice of deficiency.
● You are unsure how to respond to the notice or what documentation you need to provide.
This checklist does NOT apply if you:
● You received a statutory notice of deficiency, also known as a 90-day letter.
● You are currently appealing a final audit decision.
● You received a collection notice, levy notice, or bill demanding payment for taxes already assessed.
● You already have professional representation actively handling your audit or examination case.
What Matters Most in Your Response
Your initial response quality determines whether your case resolves quickly or escalates into multiple review cycles. The IRS prioritizes whether you acknowledge the notice by the deadline, provide complete and organized documentation on the first submission, and demonstrate cooperation. Missing deadlines or submitting incomplete responses triggers additional notices and extends the process, potentially leading to unfavorable determinations made without your input.
Step-by-Step Response Checklist
Step 1: Identify Your Notice Type Within 24 Hours
Read your notice immediately to determine if it is a CP2000 automated matching notice, which informs you of discrepancies in your tax return, a CP75 examination notice requesting documentation, or another examination letter requiring an in-person meeting. Note the specific tax year, items under review, and response deadline date.
Step 2: Confirm Your Response Deadline and Method
Calculate the exact deadline from the notice date, typically 30 days for most initial notices. Determine if your notice requires mailed documentation only or an in-person office or field examination appointment. Mark the deadline on your calendar as soon as possible.
Step 3: Request an Extension if Needed
If you cannot meet the deadline, contact the IRS office listed on the notice immediately by phone to request a brief extension before it passes. Document the date, time, agent name, and extension granted for your records.
Step 4: Gather Only the Requested Documents
Gather precisely the documents specified in the notice—such as receipts, logs, bank statements, or other supporting documentation for the specific items in question. Do not send unrequested documents, as extra paperwork complicates review and signals disorganization. Create a checklist that matches notice requests with the gathered documents.
Step 5: Organize Documents Clearly
Arrange documents in the order specified by the notice, or create a simple index listing each document by the line item of the tax return it supports. Number each page in the top right corner and label documents clearly with dates and descriptions.
Step 6: Write a Brief Factual Cover Letter
Prepare a one-page cover letter stating what you are submitting, identifying any missing items with honest explanations, and addressing the review subject factually. Never admit fault, apologize, or volunteer information beyond what was asked. Example: “Enclosed are the 2023 mileage logs and vehicle documentation requested in your notice dated January 15, 2026.”
Step 7: Make Complete Copies for Your Records
Create two complete sets of all documents before mailing: one for the IRS and one for your permanent files. Never send original documents unless specifically requested, and only then with copies retained for your records. Use a stapler or binder clips to organize each set.
Step 8: Mail Using Certified Mail with Return Receipt
Send your response via USPS Certified Mail with Return Receipt Requested to create proof of delivery and meet the deadline requirement. If fewer than five business days remain before the deadline, hand-deliver it to the IRS office address listed on the notice instead.
Step 9: Send Your Response at Least Five Business Days Early
Submit your complete response at least five business days before the stated deadline to allow for processing time. If you must send your response within three days of the deadline, please hand-deliver it to ensure timely receipt.
Step 10: Wait for the IRS Response
After mailing, allow 30 to 60 days for the IRS to review your submission and respond. Do not contact the IRS to check the status unless more than 90 days pass without communication. The IRS will issue either a closure letter, a request for additional information, or a 30-day letter proposing adjustments.
Step 11: Respond to Follow-Up Requests Promptly
If the IRS requests additional documents or clarification, treat the follow-up with the same care as the initial response: gather the ordered items, submit within the new deadline, and include a brief explanation. Follow-up requests often indicate the examiner needs clarification, not that problems were found.
Step 12: Understand Your Options if You Receive a 30-Day Letter
If you receive a Letter 525, Letter 915, or similar 30-day letter proposing adjustments after the examination, you have 30 days to either accept the findings, request an Appeals conference, or hire professional representation to negotiate. This is distinct from a statutory notice of deficiency.
Common Mistakes That Worsen Your Situation
● If you miss the response deadline, the IRS may proceed without your input and issue proposed adjustments based solely on third-party information. However, extensions are often granted if you request one before the original deadline expires.
● When you send incomplete documentation, the IRS will typically issue additional follow-up requests, which lengthen the review process and may create the impression that you are not fully cooperating, potentially influencing the examiner’s decision.
● If you include written admissions such as “I made a mistake” or “I should have kept better records,” those statements become part of your permanent IRS file and may be used against you in future appeals or collection proceedings.
● When you respond only by phone and do not provide a written follow-up, there is no formal record of the discussion in your IRS file, so you should always confirm phone conversations in writing to document what was discussed.
● If you send original documents without keeping copies for your records, you risk losing proof of submission if they are misplaced during mailing or IRS processing, which can delay resolution and require you to recreate the records.
● Adding unsolicited documents or explanations not requested in the notice may unintentionally complicate the review, introduce new issues, and make your response appear unfocused or disorganized.
If You Ignore the Notice
Ignoring an IRS notice allows the examination or underreporter inquiry to proceed based only on your original tax return and third-party information reports the IRS has on file. The IRS will make determinations without considering your documentation or explanations. You will receive a 30-day letter proposing adjustments and offering appeal rights. If you ignore that letter, the IRS will issue a statutory notice of deficiency (also known as a 90-day letter), which is your final opportunity to petition the Tax Court without first paying the tax. After 90 days without a petition, the IRS assesses the tax and begins collection.
When to Seek Professional Help
Consider hiring a tax professional before responding if the audit involves complex business deductions, depreciation, or cost-basis calculations that require specialized knowledge. Professional help becomes critical if you lack the requested records, if the notice concerns multiple tax years or income categories, if you have received a field or office audit requiring in-person meetings, or if you have received numerous follow-up requests indicating that the case is not resolving simply.
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This checklist is for educational purposes only and does not constitute tax or legal advice. Always review official IRS instructions and consult a qualified professional for guidance.