What to Expect During an IRS Correspondence Audit: A Step-by-Step Guide

How to read the notice (and what it means for you)

When the IRS opens a correspondence audit, it will send a written notice by U.S. mail identifying the tax year and the specific items it is questioning. The notice will tell you exactly what documents or explanations the IRS wants and include a deadline—usually 30 days from the date of the notice, though some notices allow 60 days (check your letter). Always read the notice header for the notice type (for example, CP-series or a customized letter number) and the tax year shown.

Why this matters: the IRS is not asking to review your entire return in a correspondence audit. Instead, it’s focusing on select discrepancies—such as a reported deduction that needs proof or a wage/1099 mismatch (the CP2000 notice is related to income-matching and is different from some audit letters). Responding precisely to what’s requested is the fastest way to close the case. (IRS: “Correspondence Audits”)

Sources: IRS, “Correspondence Audits” (irs.gov/businesses/small-businesses-self-employed/irs-correspondence-audits).

Step-by-step: How a correspondence audit typically proceeds

1. Notice arrives by mail

• Check the notice number, tax year, and requested documents.
• Do not panic. Many correspondence audits are resolved with routine documentation.

1. Organize requested documents

• Create a packet that directly mirrors the IRS request. If the IRS asks for “home office expenses for 2022,” include the business-use calculation, receipts, a floor-plan or square-footage worksheet, and your 2022 Schedule C excerpt.
• In my practice I’ve found that a one-page cover letter and clearly tabbed documents reduce follow-up requests.

1. Prepare a concise cover letter

• Put the taxpayer name, SSN or EIN (last four digits preferred for mailed copies if security is a concern), tax year, and notice/case number at the top.
• State each issue and the documents attached that address it (e.g., “Issue 1: Home office. Attached: floor plan, calendar of business activities, receipts totaling $X”).

1. Choose a secure delivery method

• Use certified mail with return receipt, a tracked courier, or the IRS secure e-file portal (available to practitioners). Keep copies of everything you send. Do not send originals unless the IRS explicitly asks for them.

1. Wait for IRS review

• The IRS reviewer will accept documentation, ask follow-up questions, propose adjustments, or close the case. Typical resolution can be weeks to a few months, depending on complexity and IRS workload.

1. Respond to follow-up quickly

• If the IRS asks for more information, respond within the new deadline. Timely, complete answers reduce the chance of escalation to an office or field audit.

1. Result: Agreement, adjustment, or further action

• The IRS may accept your documentation, propose additional tax owed (with interest/penalties if applicable), or refer the case for a higher-level review or in-person audit if there are unresolved issues.

Documentation checklist — what to gather

• Income: W-2, 1099s, bank deposits tied to business, ledger reconciliations.
• Deductions: Receipts, invoices, canceled checks, merchant statements, credit card statements.
• Business use of home: square footage worksheet, photos/floor plan, records of time spent on business activities.
• Vehicle use: mileage logs, dates/purposes of trips, odometer readings.
• Proof of identity/filing: copy of the filed tax return pages showing the item(s) in question.

Tip from practice: organize items in the same order the IRS listed them and include a short, numbered reconciliation showing how each document supports the line item on the return.

Communication best practices

• Never delay. Most IRS notices include a deadline; missing it can lead to default adjustments and collections.
• Keep written records of all communications and shipping receipts. If you speak with an IRS agent by phone, note the date/time, the agent’s name/ID, and a short summary.
• Protect yourself from scams: the IRS usually initiates contact by mail. If someone calls demanding immediate payment or threatens arrest, it is likely a scam. Verify mail notice numbers on irs.gov.

Authoritative resources: IRS notices guidance and “Understanding Your IRS Notice” pages at irs.gov provide official notice descriptions.

If you can’t find requested documents

Explain the situation clearly in your cover letter and provide alternative substantiation (bank statements, ledgers, contemporaneous records). The IRS accepts reasonable reconstructions in many cases, though stronger documentation is preferable. If records were lost (fire, theft, computer crash), provide supporting evidence (insurance claims, police reports, or other corroboration) and a detailed explanation of efforts taken to reconstruct the records.

When to get professional help

• Complex issues (business income mismatches, large charitable deductions, casualty losses).
• Requests involving multiple years or potential penalties.
• You prefer representation: an enrolled agent (EA), CPA, or tax attorney can correspond with the IRS on your behalf when authorized by Form 2848 (Power of Attorney) (see IRS Form 2848). Having a practitioner handle communications often reduces taxpayer stress and lowers the risk of missteps.

Possible outcomes and appeals

Outcomes typically include acceptance of your documentation, a proposed adjustment with a balance due, or referral for additional review. If you disagree with an adjustment, you can:

• Request an explanation in writing and provide new documentation.
• File an appeal with the IRS Office of Appeals (procedures are described in the notice you receive).
• Consider Tax Court only after paying a proposed deficiency or following the appeals process and time limits.

The IRS provides a Taxpayer Bill of Rights explaining your appeal and representation rights (irs.gov/taxpayer-bill-of-rights).

How to avoid correspondence audits in the future

• Keep year-round organized records and contemporaneous documentation.
• Reconcile income and 1099s with your reported amounts before filing.
• Use consistent bookkeeping and consider payroll for family or employee wages where appropriate.
• When claiming uncommon deductions (large charitable gifts, home office, business start-up costs), maintain extra documentation and be prepared to explain your method.

See our detailed guides on assembling a packet and remote documentation tactics: Preparing a Document Packet for an IRS Correspondence Audit and Preparing for a Correspondence Audit: Remote Documentation Tactics.

Also useful: Responding to IRS Correspondence: Best Practices and Timelines.

Timing expectations

• Initial review: typically within 30–90 days after the IRS receives your response, though complexity and IRS backlog can extend that timeline.
• If the IRS proposes an adjustment, they must provide an explanation and appeal rights with the notice.

Avoiding common mistakes

• Don’t over-explain: answer only what is asked and provide clear, labeled documents.
• Don’t ignore identity protection: redact full SSNs on mailed copies if your notice allows (include last four digits and return the original to IRS if requested).
• Don’t admit guilt in a cover letter. Present facts and evidence without speculative statements.

Final steps after resolution

Keep all correspondence and copies of what you sent for at least three years (longer if issues relate to unreported income or fraud). If you paid an assessed amount and later discover an error, consult a tax professional about refund claims or amended returns.

Professional disclaimer

This article is educational and does not constitute tax advice. For guidance tailored to your situation, consult a qualified tax professional (CPA, EA, or tax attorney). Sources consulted include IRS correspondence guidance and procedural pages (irs.gov) and IRS Form 2848 for representation authority.

Sources and further reading

• IRS, “Correspondence Audits” (irs.gov/businesses/small-businesses-self-employed/irs-correspondence-audits)
• IRS, “Taxpayer Bill of Rights” (irs.gov/taxpayer-bill-of-rights)
• IRS Form 2848 (Power of Attorney) and instructions (irs.gov/forms-pubs/about-form-2848)

If you’re preparing documents now, start with the checklist above and use the sample cover-letter approach: it makes reviews faster and reduces the chance of follow-up requests in my experience.