IRS Correspondence Audit Response: Templates for the 5 Most Common Scenarios

Most IRS audits are not the sit-down-with-an-agent kind. Roughly 75% of individual audits are correspondence audits: the IRS sends a letter, you send a response, and the IRS decides. No meeting, no office visit, no field agent. The letter comes from the IRS’s Automated Underreporter (AUR) program or the examination function, and it says the IRS has information that does not match your return. Your response determines the outcome. A clear, documented response closes the case. A vague or missing response results in an assessment you did not need to owe. This page covers the five most common correspondence audit scenarios and how to respond to each.

What is a correspondence audit?

A correspondence audit is an IRS examination conducted entirely by mail (or fax). The IRS identifies a discrepancy on your return, sends you a notice describing the issue, and asks you to either agree with the proposed change or provide documentation showing why the change is wrong. The entire process happens through written communication.

The most common correspondence audit notices:

CP2000. The Automated Underreporter (AUR) program matches third-party information returns (W-2s, 1099s, 1098s, K-1s) against your tax return. When there is a discrepancy (income reported to the IRS by a payer that does not appear on your return, or appears at a different amount), the IRS sends a CP2000 proposing additional tax. This is the most common correspondence audit notice. For a detailed walkthrough, see IRS CP2000: respond, agree, or disagree.

CP2501. Similar to the CP2000 but used for discrepancies that need clarification before the IRS proposes a specific tax change. The CP2501 asks you to explain the difference rather than immediately proposing an adjustment.

Letter 566 (or 525, 950). A formal examination notice from the IRS examination function (not the AUR program). These letters identify specific items on the return being examined and request documentation. They are more targeted than CP2000 notices and may cover deductions, credits, or filing status rather than just income matching.

Scenario 1: Income was reported but on a different line

The IRS says you did not report $12,000 in income shown on a 1099-MISC. You did report it, but as self-employment income on Schedule C rather than as “other income” on Schedule 1. The amounts match; the IRS’s matching system did not connect the 1099-MISC to your Schedule C.

Response approach:

Your letter explains that the income was reported, identifies exactly where on the return it appears, and attaches a copy of the relevant pages.

Template structure:

Re: CP2000 for tax year [year], SSN [last 4], Notice date [date]

I received the CP2000 proposing additional tax of $[amount] based on unreported income of $[amount] from [payer name] shown on Form 1099-MISC.

This income was reported on my return. It appears on Schedule C, line 1 (gross receipts), as part of my self-employment income from [business name/activity]. The total on Schedule C line 1 is $[amount], which includes the $[amount] from [payer name].

Attached: (1) Copy of my filed Schedule C showing the gross receipts total. (2) Copy of the 1099-MISC from [payer name].

No additional tax is owed. Please close this matter.

This is the most common CP2000 scenario, and the simplest to resolve. The IRS’s matching algorithm is not sophisticated enough to trace a 1099-MISC to a specific line on Schedule C when the taxpayer has multiple income sources.

Scenario 2: The 1099 is wrong

The IRS says you received $25,000 from a brokerage, based on a 1099-B. You did sell securities, but the 1099-B shows gross proceeds without accounting for your cost basis, so the IRS is treating the entire $25,000 as gain when your actual gain was $3,000.

Response approach:

Your letter explains the correct calculation, provides the cost basis documentation, and shows that the tax was computed correctly on your return.

Template structure:

Re: CP2000 for tax year [year], SSN [last 4], Notice date [date]

The CP2000 proposes additional tax based on $25,000 in proceeds from [brokerage name] shown on Form 1099-B. The proposed change treats the full $25,000 as taxable income.

The $25,000 represents gross proceeds from the sale of securities. My cost basis in these securities was $22,000, resulting in a net gain of $3,000. This gain was reported on Schedule D and Form 8949 of my filed return.

Attached: (1) Copy of Form 8949 showing the transactions, proceeds, cost basis, and gain. (2) Copy of the 1099-B from [brokerage]. (3) Brokerage statement showing purchase dates and cost basis.

The correct additional tax is $0. The gain was already reported and taxed on my return.

This scenario is extremely common for investment accounts. Many 1099-Bs report gross proceeds without basis, and the IRS’s system computes tax on the full amount if the taxpayer did not file Form 8949.

Scenario 3: You agree with some items but not others

The IRS proposes changes covering three items: (1) unreported interest of $200 from a bank account you forgot about (you agree), (2) unreported dividend income of $1,500 from a brokerage (you reported it, just on a different line), and (3) a disallowed education credit of $2,500 (you disagree, you have the Form 1098-T).

Response approach:

Respond to each item separately. Agree where appropriate, explain the already-reported income, and provide documentation for the disputed credit.

Template structure:

Re: CP2000 for tax year [year], SSN [last 4], Notice date [date]

I received the CP2000 proposing changes based on three items. I respond to each below.

Item 1: Interest income of $200 from [bank name]. I agree. This interest was not included on my return.

Item 2: Dividend income of $1,500 from [brokerage name]. I disagree. This income was reported on Schedule B, line [X], as part of my total dividend income of $[amount]. See attached copy of Schedule B and the 1099-DIV.

Item 3: American Opportunity Credit of $2,500. I disagree. I was enrolled at [institution] and paid qualified tuition expenses of $[amount]. See attached Form 1098-T from [institution] and receipts for tuition and required fees.

Based on the above, the correct additional tax for item 1 is approximately $[amount] (interest income at my marginal rate). No additional tax is owed for items 2 and 3.

Partial agreement is common and appropriate. Agreeing to the items the IRS is right about while contesting the items it is wrong about shows good faith and focuses the dispute on the real issues.

Scenario 4: Cross-border income mismatch

The IRS says you received $8,000 in income from a Canadian source, shown on a 1042-S (Foreign Person’s U.S. Source Income Subject to Withholding). You are a Canadian resident who earned US-source income, and the 1042-S reports the gross amount before withholding. Your US return reported the net amount after the treaty-reduced withholding rate, or the income was exempt under the treaty and not reported on the US return at all.

Response approach:

This is the most common cross-border correspondence audit trigger. The IRS’s matching system does not account for treaty benefits, and 1042-S reporting frequently creates mismatches. Your response explains the treaty position and provides documentation.

Template structure:

Re: CP2000 for tax year [year], SSN [last 4], Notice date [date]

The CP2000 proposes additional tax based on $8,000 shown on Form 1042-S from [US payer]. I am a resident of Canada for purposes of the Canada-US Income Tax Convention (the “Treaty”).

[Option A, if treaty-exempt:] This income is exempt from US tax under Article [X] of the Treaty. As a Canadian resident, [description of income type] is taxable only in Canada under the Treaty. I claimed treaty benefits on Form 8833, which was filed with my return. See attached Form 8833 and the relevant pages of my return.

[Option B, if treaty-reduced rate:] This income was subject to a reduced withholding rate of [15%/10%/0%] under Article [X] of the Treaty. The 1042-S shows gross income of $8,000 and withholding of $[amount] at the treaty rate. This withholding was reported on my return as a credit on Form 1040, line [X]. The income was reported on [Schedule/line]. No additional tax is owed.

Attached: (1) Copy of Form 8833 (treaty-based return position). (2) Copy of Form 1042-S. (3) Relevant pages of my filed return showing the income and credit.

Cross-border filers receive CP2000 notices more frequently than domestic filers because the treaty reporting system creates structural mismatches. The IRS’s AUR system does not read Form 8833 or apply treaty rates automatically.

Scenario 5: You fully disagree and the IRS is wrong

The IRS proposes a $6,000 adjustment based on a 1099-NEC from a company you never worked for. The 1099 was issued in error (wrong SSN, confusion with another contractor, or the company issued a 1099 for amounts already reported on your W-2).

Response approach:

State clearly that the 1099 is erroneous, explain why, and provide any supporting documentation. If you can get a corrected 1099 from the issuer, include it. If the issuer will not correct it, explain that and provide whatever evidence you have.

Template structure:

Re: CP2000 for tax year [year], SSN [last 4], Notice date [date]

The CP2000 proposes additional tax based on a 1099-NEC showing $[amount] in non-employee compensation from [company name]. This 1099-NEC was issued in error.

[If corrected 1099 obtained:] I contacted [company name] and they issued a corrected 1099-NEC showing $0. See attached corrected Form 1099-NEC.

[If no corrected 1099:] I contacted [company name] on [date] and requested a corrected 1099-NEC. They have not issued one. The 1099-NEC is erroneous because [I never performed work for this company / the amounts shown were already reported on my W-2 from the same company / the SSN on the 1099-NEC does not match my records]. See attached: [correspondence with the company, W-2 showing the same amounts, other supporting documentation].

No additional tax is owed. I request that the proposed changes be withdrawn.

When a 1099 is wrong and the issuer will not correct it, the taxpayer must respond to the CP2000 with an explanation. The IRS cannot force the issuer to correct the 1099, but the IRS can accept the taxpayer’s explanation if it is supported by evidence.

General response rules

Respond before the deadline. The notice gives you 30 days (sometimes 60). If you need more time, call the number on the notice and request an extension. The IRS usually grants 30 additional days.

Send by certified mail or fax. The IRS occasionally claims it did not receive a response. Certified mail with return receipt (or fax with a confirmation page) creates proof of delivery. The mailbox rule under IRC 7502 treats a timely-mailed response as timely received.

Include the notice number and your SSN on every page. The IRS processes millions of pieces of correspondence. Your response must be matched to your case. The notice number (top right corner of the CP2000) and your SSN are the matching keys.

Attach copies, not originals. The IRS can lose documents. Keep originals in your files.

Do not call unless the issue is simple. For a simple matching error (scenario 1), a phone call to the number on the notice can sometimes resolve the issue immediately. For anything requiring documentation (scenarios 2 through 5), a written response with attachments is more effective and creates a record.

If you do not respond, the IRS will assess the proposed changes automatically. This is called a “statutory notice of deficiency” (90-day letter). Once the 90-day letter is issued, your only recourse is Tax Court within 90 days. Do not let a correspondence audit escalate to this stage by failing to respond.

What should I do next?

Read the notice carefully. Identify which items the IRS is questioning. Determine whether you agree, partially agree, or disagree. Gather the documentation for any items you dispute. Respond in writing before the deadline with the notice number, your SSN, a clear explanation for each item, and copies of all supporting documents. If the notice involves cross-border income, treaty positions, or foreign tax credits, the response requires documentation from both countries’ returns.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.