Getting an IRS notice with words like “examination” or “audit” can spike your heart rate, but the process itself is orderly and rule-bound. The IRS follows a predictable sequence from the first letter to final closure, and each stage comes with specific rights, deadlines, and options. This guide walks through that timeline step by step so that if a notice ever lands in your mailbox, you will know exactly where you stand and what happens next.
The Three Types of IRS Audits
Not all audits look alike. The IRS uses three examination formats, and the timeline below applies to all of them with adjustments noted where they matter.
Correspondence audits are handled entirely by mail. The IRS asks for documentation supporting specific items on your return, and you respond with copies. These are the most common type and the least disruptive.
Office audits take place at an IRS office. You or your representative meet with an examiner in person, bring records, and answer questions about the return. They are more thorough than correspondence audits and usually involve multiple issues.
Field audits happen at your home, place of business, or your representative’s office. These are the most comprehensive, typically reserved for businesses and higher-income returns with complex issues.
Stage 1: The Notice (Days 1-30)
Every audit begins the same way: a letter in the mail. The IRS does not initiate audits by phone, email, text, or social media. If your first contact about an examination comes through any other channel, you are dealing with a scammer, not the IRS.
The notice will identify the tax year or years under examination, the specific items being questioned, the type of audit, and the deadline for your response. It will also name the examiner or unit handling your case and explain how to request more time if you need it. Read the notice twice. Circle the deadline. Then gather the records that relate to the items named, not your entire financial life. Examiners appreciate focused, organized responses, and a clean submission sets the tone for the whole examination.
If the notice raises an item you know was also reported differently by a third party, our guide on what triggers an IRS audit can help you understand why your return was selected in the first place.
Stage 2: The Examination (Weeks 2-12)
This is the information-gathering phase. The examiner reviews the documents you provide and compares them against your return. For correspondence audits, this means the copies you mailed in. For office and field audits, it means the records you present and the questions you answer.
Expect follow-up requests. It is normal for an examiner to ask for additional documentation after seeing your first submission. Bank statements, receipts, mileage logs, invoices, and contracts are the usual currency of this stage. Provide what is asked for, nothing more and nothing less. Volunteering unrelated records can expand the scope of the examination into areas that were never questioned.
Several practical rules make this stage smoother:
- Respond by the deadlines. Extensions are usually granted if you ask before the date passes, but missing a deadline without asking is one of the fastest ways to lose goodwill.
- Send copies, never originals. Documents get lost. Keep your originals in a safe place.
- Organize by issue. Label each batch of documents with the tax year and the item it supports. An examiner who can follow your records quickly forms a better impression than one who must decode a shoebox.
- Be truthful and concise. Answer the questions asked. Do not guess, speculate, or volunteer theories.
If you have a representative, such as a tax attorney or enrolled agent, they can handle communications and appear on your behalf. Many taxpayers find that professional representation reduces stress and prevents inadvertent misstatements.
Stage 3: The Findings and Proposed Changes (Months 2-6)
When the examiner finishes reviewing your records, you will receive the findings: a written explanation of what was accepted, what was disallowed, and what additional tax, if any, is proposed. The report shows the examiner’s reasoning item by item, so you can see exactly which deductions failed and why.
This is a proposal, not a final bill. At this point you have three options:
- Agree. If the examiner is right, you can sign the agreement form. You will owe the additional tax plus any interest and applicable penalties, and the case moves to closure.
- Disagree in whole or in part. You can provide additional documentation and discuss the issues with the examiner’s supervisor or request a conference with the IRS Independent Office of Appeals.
- Do nothing. This is never the right choice. If you ignore the findings, the IRS will issue a formal notice of deficiency and the proposed changes become much harder to unwind.
Many examinations end at this stage. Examiners are human, and a well-documented disagreement backed by records often narrows or eliminates the proposed changes. The key is to respond with evidence rather than argument.
Stage 4: Agreement or Appeal (Months 4-12)
If you and the examiner cannot agree, the case moves up. The IRS Independent Office of Appeals is separate from the examination function, and its job is to settle disputes fairly without litigation. Appeals officers look at the hazards of litigation for both sides, which means reasonable cases often settle for less than the full proposed amount.
The appeals process typically involves a written protest or a small-case request, depending on the amount at stake, followed by a conference that can happen by phone, video, or in person. Most appeals conferences last a few hours, and many cases settle in a single session. If you reach an agreement at appeals, you sign a closing agreement and the case ends.
If appeals does not resolve the dispute, you retain the right to petition the U.S. Tax Court, where many cases also settle before trial. At every level, the quality of your documentation matters more than the quality of your rhetoric. If the disputed amount is substantial or the legal issues are complex, this is the stage where hiring a tax attorney pays for itself. See our guide on when to hire a tax attorney for the situations where professional help is most valuable.
Stage 5: Closure (Final Resolution)
Every audit ends in one of three ways: agreement, default, or litigation. Agreement is the cleanest. You receive a closing letter confirming the changes, if any, and any balance due. Pay it, set up a payment arrangement if needed, and the case is closed.
Default happens when a taxpayer ignores the process. The IRS issues a statutory notice of deficiency, the taxpayer fails to petition the Tax Court in time, and the proposed tax is assessed by default. This is the worst outcome because it surrenders every right to dispute the findings.
Litigation is rare but available. Tax Court decisions can be appealed to the circuit courts, though most taxpayers never go beyond appeals.
After closure, keep all audit records for as long as the related tax years could be relevant. If you agreed to additional tax, interest continues to accrue on any unpaid balance, so resolving the balance quickly saves money.
Typical Timelines at a Glance
Correspondence audits often wrap up in a few months because they involve a single issue and paper submissions. Office audits commonly run several months to a year depending on the number of issues and the responsiveness of the taxpayer. Field audits of businesses can take a year or longer when the books are complex. Appeals add months on top of whatever the examination took. The single biggest variable is responsiveness: organized taxpayers who meet deadlines move through the system far faster than those who stall.
Mistakes That Make Audits Longer and Costlier
A handful of avoidable errors turn straightforward examinations into drawn-out ordeals. The most common is silence: ignoring the notice, missing deadlines, or failing to request an extension before the date passes. Examiners interpret silence as noncooperation, and cases with no response move to the harshest default track automatically.
A close second is disorganization. Dumping unsorted receipts and unreconciled bank statements on an examiner forces them to reconstruct your records, which takes months and rarely flatters the taxpayer. A related mistake is over-sharing: sending records for issues the examiner never raised can expand the audit into new territory. Stay responsive, stay organized, and stay within scope.
Finally, many taxpayers make verbal claims they cannot document. Statements like “I drove ten thousand business miles” mean nothing without a mileage log. If you say it, back it with a record. Examiners are required to work from evidence, and evidence you can produce early often ends an issue on the spot.
Your Rights During the Process
Throughout every stage, you have rights the IRS is required to honor: the right to be informed, the right to quality service, the right to pay no more than the correct amount of tax, the right to challenge the IRS’s position, the right to appeal, the right to finality, the right to privacy, the right to confidentiality, the right to retain representation, and the right to a fair and just tax system. If you believe an examiner has overstepped, you can raise the issue with their manager or contact the Taxpayer Advocate Service.
One more protection worth knowing: a mismatch notice like a CP2000 is not an audit at all. It is an automated proposal based on third-party reporting, with its own simpler response process. Our guide on how to respond to a CP2000 notice walks through the agree and disagree paths for that specific letter.
Preparing Before a Notice Ever Arrives
The best audit timeline is the one you never experience. File accurate returns, keep supporting records for every deduction and credit, reconcile third-party forms before filing, and respond to every IRS letter promptly. If your return was selected because of something specific, understanding the common audit triggers helps you fix the underlying issue for future years. And for the official word on examinations, the IRS maintains a page on IRS audits describing the process and taxpayer rights.
This guide is for general information only and is not tax or legal advice. Consult a qualified tax attorney about your situation.
