What to Do If You Receive an IRS Audit Letter (2026) — Correspondence Audits, CP2000 Notices, and When to Hire Representation

The IRS conducts examinations in three formats. Understanding which type you are dealing with determines how you respond and how much urgency the situation carries.

A CP2000 is not technically an audit, but it arrives like one. The IRS's Automated Underreporter (AUR) system compares income reported on 1099s, W-2s, and other third-party documents against what appeared on your tax return. When it finds a discrepancy, it generates a CP2000 — a proposal to adjust your income, tax, credits, or deductions. It is a proposal, not a bill and not a formal audit finding.

You have 30 days from the notice date to respond (60 days if you live outside the US). If you agree with the proposed change, sign the response form and return it — with or without payment. If you disagree, check the disagreement box, write a brief explanation, and include supporting documentation showing why the income was already reported, was not taxable, or was offset by deductions the IRS did not have on file.

Most IRS letters set a response deadline — typically 30 days from the notice date. The IRS systems are largely automated: when a response deadline passes with no reply, the case advances to the next stage automatically. An unanswered correspondence audit can become an unanswered 30-day letter; an unanswered 30-day letter becomes a Statutory Notice of Deficiency; a Statutory Notice of Deficiency, if not responded to within 90 days, results in a tax assessment that can then be collected.

The IRS does grant extensions in many cases — but you have to ask. Call the number on the notice, explain that you need additional time to gather records, and request an extension before the deadline passes. Extensions are generally granted for correspondence audits; they are not guaranteed, but a proactive call almost always produces a better result than silence.

In an IRS examination, the burden of proof generally rests with the taxpayer. The IRS doesn't have to disprove what you claimed — you have to prove you were right. This is why documentation discipline matters: receipts, bank statements, mileage logs, donation acknowledgment letters, and contract records are the evidence that resolves a correspondence audit quickly.

Before sending anything to the IRS: make photocopies of every document you submit. Send copies only — never originals. The IRS will not return documents you send, and originals are difficult to replace if lost in transit or processing.

The documentation you should already have on file: bank statements for the tax year, receipts for deductions claimed (business meals, equipment, home office), mileage logs for vehicle deductions, charitable donation acknowledgment letters for gifts over $250, and 1099s and W-2s matching what you reported. If you can't locate a receipt, a bank or credit card statement showing the charge may be acceptable as a secondary source — but the stronger the documentation, the faster the case closes.

"Most correspondence audits close the same way they start — by mail. The IRS asks for evidence of a specific deduction. You send copies of the receipts. The case closes with no change. The taxpayers who panic and don't respond are the ones who end up with an unwanted assessment they didn't fight."

Not every audit requires professional representation. A simple correspondence audit asking for receipts to back up a charitable deduction is something most taxpayers can handle on their own. But as complexity, dollar amounts, or risk levels rise, professional help pays for itself.

A general rule: if the amount the IRS proposes to assess exceeds what a professional would charge to represent you, hire the professional. If the audit is a straightforward correspondence audit over a deduction you can document with paperwork you have on file, handle it yourself — but don't skip responding.

The IRS is required to inform every taxpayer of their rights under the Taxpayer Bill of Rights. There are 10 of them, codified in IRC §7803(a)(3) and published in IRS Publication 1. Several matter directly in an audit context.

If you go through an audit and disagree with the result, you don't have to accept it. After the examination closes, the IRS sends a 30-day letter proposing changes. You have 30 days to request an appeals conference with the IRS Office of Appeals — an independent body within the IRS that reviews examination decisions.

Appeals is a legitimate and frequently used path. The Office of Appeals operates separately from the examination function, and its role is to resolve disputes without litigation. It is free to use (no filing fee). If you can't resolve the matter through appeals, you may then petition Tax Court — but that step is less common and typically involves attorney representation.

If you believe the IRS is being unresponsive or that the process is taking an unreasonable amount of time, the Taxpayer Advocate Service (TAS) is an independent organization within the IRS that helps taxpayers resolve problems. TAS can intervene when normal IRS channels are stalled. Their website is at taxpayeradvocate.irs.gov.

• Don't ignore the letter. An unanswered IRS notice escalates automatically through the IRS system.
• Don't sign anything you don't understand. Read the response form carefully and consult a professional if anything is unclear.
• Don't volunteer information beyond what the notice specifically asks for. The scope of a correspondence audit is defined by what the IRS letter requests — keep your response focused.
• Don't lie or fabricate records. Tax fraud carries criminal penalties. If your records are incomplete, a tax professional can help you reconstruct them from legitimate sources.
• Don't send original documents. The IRS does not return documents. Send copies and keep originals.

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