How to Appeal an IRS Audit: The 30-Day Letter and Beyond

You don’t have to accept an IRS auditor’s conclusions. The Office of Appeals is an independent branch of the IRS — separate from the examination division — and its job is to resolve disputes without litigation. Most cases that go to Appeals settle, often for less than the auditor’s proposed adjustment. Here’s how the process works.

When to appeal

At the close of an audit, the examiner will issue a “30-day letter” — typically with an attached examination report (Form 4549 or similar). The 30-day letter offers you the chance to either agree, ignore (which leads to a Statutory Notice of Deficiency), or formally protest to Appeals.

Appeals is the right venue when you have a genuine factual or legal disagreement with the adjustment, or when penalties are being asserted that you believe lack reasonable cause or supervisory approval. For more on penalties specifically, see IRS Audit Penalties: What They Are and How to Fight Them.

The formal protest

For disputes over $25,000, you must file a written protest. It should include:

• Your name, address, and a daytime phone number
• A statement that you want to appeal the findings
• A copy of the letter showing the proposed changes
• The tax periods at issue
• A list of changes you disagree with
• Facts supporting your position
• Law or authority supporting your position
• A signed penalties-of-perjury statement

For disputes of $25,000 or less, a Small Case Request (Form 12203) is sufficient — just check the boxes for items you disagree with and briefly explain why.

Who is the Appeals Officer?

An Appeals Officer is an experienced IRS employee — often a former agent or attorney — whose job is to evaluate the hazards of litigation. They are explicitly required to consider what a court would likely do if the case were tried. That makes Appeals a forum where new legal arguments and settlement offers actually move the needle, in a way they often don’t with the examining agent.

What to expect at the conference

Appeals conferences are usually held by phone or video, occasionally in person. They are informal compared to court — no sworn testimony, no formal evidence rules. You (or your representative) present your facts and legal arguments. The Appeals Officer asks questions, and both sides discuss whether a settlement makes sense.

The Officer cannot use “settlement value” of an issue as an excuse to give you a bad deal — settlements are based on the Officer’s assessment of how the case would resolve if litigated. That’s leverage in your favor when the underlying law is genuinely uncertain or the IRS’s facts are weak.

If Appeals doesn’t resolve it

If you can’t reach agreement, the IRS issues a Statutory Notice of Deficiency (the “90-day letter”). You then have 90 days to file a petition in the U.S. Tax Court — the only court where you can litigate without first paying the tax. Filing the petition preserves your rights and can land your case in Appeals a second time before trial.

Key procedural points

• The 30 days runs from the date on the letter — not the date you receive it
• You can request an extension if needed, but get it in writing
• New issues raised in Appeals — unless connected to the original audit issues — may be sent back to Exam
• Once a case is in Appeals, the examining agent typically cannot be involved in settlement discussions (the “ex parte” rule)

If you haven’t already received your audit notice or letter, start here: How to Respond to an IRS Audit Letter. For more on the timing of the overall process, see IRS Audit Timeline.