IRS Correspondence Audit — Complete Response Guide for Tax Professionals

What Is a Correspondence Audit?

A correspondence audit is the most common type of IRS examination, conducted entirely by mail without requiring the taxpayer to appear at an IRS office. According to the IRS Data Book, correspondence audits account for approximately 73% of all individual return audits. They are typically initiated by the Automated Underreporter (AUR) program, which matches information returns (W-2s, 1099s, K-1s) against the taxpayer's filed return and identifies discrepancies.

The most common correspondence audit notice is the CP2000 notice, which proposes changes to the return based on information the IRS received from third parties. Other common correspondence audit notices include CP2501 (initial contact before CP2000), Letter 2030 (examination of specific items), and Letter 566 (audit of itemized deductions or credits).

Common Correspondence Audit Triggers

Understanding what triggers a correspondence audit allows practitioners to advise clients proactively and prepare documentation in advance. The most common triggers include:

Unreported Income: The AUR program identifies income reported on 1099-NEC, 1099-K, 1099-B, 1099-INT, 1099-DIV, and W-2 forms that does not appear on the return. This is the most common trigger. The IRS receives copies of all information returns and compares them to the filed return using its AUR system.

Disallowed Credits: The EITC, Child Tax Credit, American Opportunity Credit, and Premium Tax Credit are frequently audited through correspondence. The IRS may request documentation proving the taxpayer meets the eligibility requirements for these credits.

Basis Reporting: When a taxpayer sells securities, the IRS compares the reported proceeds (from Form 1099-B) to the reported gain or loss. If the basis is missing or appears incorrect, the IRS may propose to treat the entire proceeds as gain.

How to Respond to a Correspondence Audit

The response strategy for a correspondence audit depends on whether the IRS's proposed adjustment is correct, partially correct, or entirely incorrect. The practitioner should take the following steps:

Step 1 — File Form 2848: File a Form 2848 (Power of Attorney) immediately to ensure all IRS communications are routed to the practitioner. This prevents the client from responding directly and potentially making admissions that expand the scope of the audit.

Step 2 — Analyze the Notice: Carefully compare the IRS's proposed changes to the original return. Identify each line item being questioned and determine whether the IRS's position is correct, partially correct, or incorrect. Request the client's complete records for each disputed item.

Step 3 — Prepare a Written Response: Submit a written response by the deadline (typically 30-60 days). The response should include: (a) a clear statement of the taxpayer's position, (b) supporting documentation, and (c) applicable legal authority (IRC sections, Treasury regulations, IRS publications). Always respond in writing — phone calls do not create a record.

Step 4 — If Partially Agreeing: If some items are correct and others are disputed, clearly delineate which items are agreed and which are disputed. Pay the agreed amount to stop interest from accruing on that portion.

Case Study: CP2000 for Unreported 1099-K Income

Client Profile: Sarah Mitchell, a freelance graphic designer, received a CP2000 notice proposing $18,400 in additional tax plus $3,200 in penalties and interest. The IRS identified $72,000 in 1099-K payments from PayPal and Stripe that did not appear on her Schedule C.

Analysis: Her practitioner reviewed her records and found that the $72,000 in 1099-K payments was already included in her reported Schedule C gross receipts of $89,000 — but the IRS's AUR system did not recognize this because the 1099-K amounts were aggregated differently than how she reported them. The 1099-K amounts were not "unreported income" — they were already on the return.

Response: The practitioner submitted a written response with a reconciliation schedule showing exactly how each 1099-K payment was included in the reported $89,000 gross receipts, supported by bank statements and accounting records. The response cited IRS CP2000 guidance on reconciliation procedures.

Outcome: The IRS accepted the response and closed the case with no change. The proposed $18,400 tax assessment was fully abated. Total time: 6 weeks from notice to resolution.

Frequently Asked Questions