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An IRS audit is an examination of a tax return; an appeal is an administrative review within the IRS; a lawsuit is a court case; and a settlement is an agreement that can resolve a dispute at more than one stage. The terms are not interchangeable, and the notice you receive determines what options and deadlines apply. This guide covers U.S. federal tax procedures, not state tax audits or court proceedings.
How an audit, appeal, lawsuit, and settlement differ
The key differences are who is reviewing the issue, where the process is happening, and what notice or agreement controls the next step.
| Term | What it means | Who handles it | What may happen |
|---|---|---|---|
| Audit (examination) | The IRS reviews items on a filed return for accuracy. | An IRS examination function. | The examination may end with no change, a refund, agreed adjustments, or proposed adjustments. IRS Publication 556 |
| Appeal | Administrative review of a disputed IRS decision. | The IRS Independent Office of Appeals, separate from the examining office. | Appeals may resolve issues without litigation. IRS Appeals at a Glance |
| Lawsuit | A judicial challenge to an eligible IRS determination. | Usually the U.S. Tax Court for a petition following a qualifying notice; other federal court routes may apply in different circumstances. | A Tax Court case begins when an eligible taxpayer files a petition by the deadline for the case type. U.S. Tax Court guidance |
| Settlement | An agreement resolving some or all disputed issues or liability. | It may occur in Appeals, during a Tax Court case, or through a collection program. | A Tax Court settlement may be submitted as a stipulated decision for the Court to enter. U.S. Tax Court guidance |
An audit can lead to a disagreement, but it is not itself a lawsuit. An appeal is still an IRS process, not a court proceeding. A settlement describes a possible resolution, not a single procedural stage.
What happens during an IRS audit?
The IRS accepts most returns as filed but examines some returns to check whether income, expenses, credits, and other items were reported accurately. It may select returns through computerized screening, random samples, or information matching. Selection does not, by itself, mean the taxpayer made an error or acted dishonestly; examinations can result in a refund or acceptance without change. IRS Publication 556
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If the examination proposes changes
Read the examination report and accompanying letter carefully. Identify the specific items you disagree with and collect records supporting your position. The appropriate next step depends on the letter: it may describe how to agree, how to request an appeal, or what deadline applies. The IRS advises taxpayers to explain the disputed items and reasons when preparing an appeal request. Preparing a Request for Appeals
How an IRS appeal works
The IRS Independent Office of Appeals reviews eligible disputes separately from the office that examined the return. Appeals reviews facts, law, and each side’s positions, and its role includes resolving tax controversies without litigation. It handles matters before a Tax Court petition and cases after one has been filed. IRS Appeals at a Glance
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Not every disagreement qualifies
Do not assume that any IRS bill or notice can be appealed. The IRS says an appeal may be appropriate when the correspondence explains appeal rights, you disagree with the decision, and you have not signed an agreement. Its guidance generally does not treat a bill that mentions no appeal right, or a concern limited to inability to pay, as an Appeals matter. Follow the rights and instructions in your own letter. IRS: Considering an Appeal
Fast Track mediation
Fast Track is a voluntary IRS mediation option for many unresolved examination and collection issues after the examiner or collection officer has completed work. A mediator helps the parties try to reach a resolution but cannot force either side to participate or accept an outcome. If the issue is not resolved, the taxpayer may retain access to traditional Appeals. Availability depends on the issue and program rules. IRS Fast Track
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When an IRS dispute becomes a lawsuit
A Tax Court lawsuit starts with a petition filed in response to a qualifying notice. Receiving an audit letter or disagreeing with an examiner does not, on its own, start a court case. The notice and the type of case determine whether a Tax Court petition is available and how long you have to file. U.S. Tax Court: Starting a Case
Check the deadline on the notice
For a deficiency notice, the general petition deadline is 90 days after the notice is mailed, or 150 days if it is addressed to someone outside the United States. The Tax Court describes this deadline as strict and generally not extendable for a deficiency notice. Other notice types and case types have different filing periods, so do not apply the deficiency deadline universally. Check the notice and the Court’s instructions for the controlling date. U.S. Tax Court: Starting a Case
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A perceived settlement does not cancel a new notice
If you believe you reached an agreement but then receive a notice giving you petition rights, do not ignore it. Tax Court guidance says to protect your position by filing within the period stated in that notice; the IRS may be proceeding as though no settlement exists. Get advice promptly if the agreement and notice appear inconsistent. U.S. Tax Court: Starting a Case
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What “settlement” means in tax matters
A settlement is an agreement resolving some or all of a dispute or liability. It can be reached administratively through Appeals before a court case, or after a Tax Court petition has been filed. The word alone does not establish that every issue or tax year is resolved, or that a filing deadline has stopped running.
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Settlement after a Tax Court petition
A pending Tax Court case may settle without going to trial. In the process described by the Court for self-represented petitioners, the IRS prepares a stipulated decision, both the taxpayer and IRS sign it, and the IRS submits it to the Court for entry. When the Court enters the decision, the case closes in that situation without the taxpayer needing to appear at trial. U.S. Tax Court: Things That Occur Before Trial
An Offer in Compromise is a specific collection option
An Offer in Compromise (OIC) is an agreement to settle a tax liability for less than the full amount owed. It is a collection option, with OIC appeals handled through the IRS collection Appeals process; it is not a synonym for appealing an audit or settling a Tax Court lawsuit. IRS: Preparing a Request for Appeals
Quick Recap
What to do when you receive an IRS notice
- Identify what the notice is. Note whether it concerns an examination, proposed changes, appeal rights, a deficiency, collection, or a court petition. The letter’s stated rights and instructions determine the applicable route.
- Record every date and deadline. Do not substitute a general deadline for the date on your notice. If it gives petition rights, treat the filing period as active unless a qualified adviser confirms otherwise.
- Organize the disputed items and supporting records. Compare the IRS position with your return and evidence, and make a clear list of what you agree or disagree with.
- Use the channel the notice allows. Request Appeals only when the correspondence and your circumstances support that route; file a Tax Court petition only when eligible and within the applicable period.
- Seek qualified help where timing or complexity warrants it. For an active petition deadline or complex dispute, consider tax controversy counsel or a Low-Income Taxpayer Clinic. The Tax Court lists these as sources of help. U.S. Tax Court guidance
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