Table of Contents
- IRS Audits: A Beginner’s Guide to the Examination Process
- What Is An IRS Audit?
- How Does The IRS Decide To Audit A Return?
- How Are Taxpayers Notified?
- What Are The Main Types Of IRS Audits?
- Correspondence Audits
- Office And Field Audits
- What Happens Before The Examination Starts?
- What Records Does The IRS Usually Request?
- What Happens During The Examination?
- Can The IRS Ask To Extend The Time Limit?
- What Rights Does A Taxpayer Have During An Audit?
- How Does An Audit End?
- No Change
- Agreed Change
- Unagreed Change
- What If The Taxpayer Disagrees With The IRS?
- Can Taxpayers Get Help During An Audit?
- Why The Examination Process Can Become Bigger Than It First Looks
- A Short Summary For Beginners
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IRS Audits: A Beginner’s Guide to the Examination Process
Getting an IRS audit notice can feel personal, urgent, and confusing all at once. For many taxpayers, the first question is simple: What happens now? The good news is that an audit is a structured examination process, not an automatic finding of wrongdoing. In general terms, the IRS uses audits to verify items on a tax return, ask for supporting records, and decide whether any changes are appropriate.
In this post you’ll learn how the IRS examination process works for beginners, how audits usually begin, what records the IRS may ask for, what rights taxpayers have during the process, and where disagreements often go next. If you want a more detailed overview of the different audit formats and how the IRS handles records requests and proposed changes, it may help to start with this deeper breakdown of the main audit types.
Scroll to the bottom for every post in this series.
What Is An IRS Audit?
An IRS audit, also called an examination, is the IRS review of a tax return to confirm that reported income, deductions, credits, and other items are accurate. The IRS explains that audits may be handled by mail or through an in-person interview, and that the interview may take place at an IRS office, a home or business, or the office of a representative such as an accountant or attorney (IRS audits; Publication 3498, The Examination).
A lot of people hear “audit” and assume the return has already been found incorrect. That is not how the process is described by the IRS. An examination is a review. Sometimes it ends with no change. Sometimes it ends with additional tax. In some cases, the examination can even result in a refund (IRS Data Book 2024).
The IRS closed 505,514 tax return audits in Fiscal Year 2024, according to the agency’s latest Data Book, so while audits are not common for most taxpayers, they are also far from unheard of (IRS FY 2024 Data Book release).
How Does The IRS Decide To Audit A Return?
The IRS says returns may be selected through random selection and computer screening. The agency compares a return to “norms” for similar returns and also screens amended returns separately. The IRS also notes that a refund claim is not necessarily an audit trigger on its own (IRS audits).
That often means the issue is less about one dramatic red flag and more about whether a line item, deduction, credit, business loss, or income figure appears unusual compared with similar filings. In practical terms, audits often focus on documentation: whether the taxpayer can support what was reported.
This is one reason the early stage of an examination matters so much. A narrow inquiry can stay narrow, but some examinations may expand to other years or related returns. The IRS says that in certain audits, including correspondence audits, the review may be expanded to include prior and subsequent years and related returns (IRS review of requested items in audits).
How Are Taxpayers Notified?
One point the IRS states very clearly: the IRS initiates an audit by mail, not by phone (IRS audits). That matters because scam callers often claim to be from the IRS and try to create panic.
The first notice usually identifies the tax year under review, the items being examined, and the next step in the process. Depending on the type of audit, the notice may ask for specific documents, request a questionnaire, or schedule an in-person meeting. The IRS also says that if an audit is conducted by mail, it may require the taxpayer to complete a questionnaire in addition to sending records (Audits Records Request).
What Are The Main Types Of IRS Audits?
For beginners, it helps to think of audits in two broad categories: mail audits and in-person audits.
Correspondence Audits
A correspondence audit is handled through the mail. The IRS asks for documents supporting certain items on the return, and the taxpayer responds by sending copies. These audits often involve narrower issues, like proof of deductions, substantiation for credits, or confirmation of income items. The IRS notes that in a mail audit, it may also request a completed questionnaire (Audits Records Request).
Office And Field Audits
The IRS says in-person examinations may happen at an IRS office or at the taxpayer’s home, place of business, or representative’s office (IRS audits). These are often described as office or field exams. In many situations, a field audit signals a more detailed review, especially if the IRS wants to examine books, business operations, assets, or accounting practices more closely.
If you want the distinction between these formats explained in more depth, along with how records requests and proposed changes usually fit into the timeline, it may help to read our more detailed explanation of the audit formats and what they often involve.
What Happens Before The Examination Starts?
Before the examination moves into active fact-finding, the IRS typically identifies the return, sends the notice, and tells the taxpayer what it wants reviewed. Publication 3498, the IRS booklet on examinations, outlines the process in stages: before the examination, during the examination, results of the examination, appeal rights, and what happens after the examination (Publication 3498, The Examination).
At this stage, a taxpayer often learns three basic things:
- Which year is under examination
- Which issues the IRS wants to examine
- What records or explanations the IRS wants first
In general terms, this early notice sets the tone for the rest of the case. If the IRS asks for five items, the examination may begin with those five items. If the response is incomplete or inconsistent, the inquiry can become broader.
What Records Does The IRS Usually Request?
The IRS says every audit focuses on certain aspects of a return, and that the records requested will depend on the issues under review. Its records-request guidance explains that no record stands on its own and that taxpayers should include the circumstances surrounding the documents they submit. The IRS also advises sending copies, not originals (Audits Records Request).
The exact records vary, but common categories include:
- Receipts and invoices
- Bank statements
- Canceled checks
- Mileage logs
- Payroll records
- Closing statements for real estate
- Brokerage records
- Business books and ledgers
- Documentation supporting dependents, credits, or deductions
That “no record stands on its own” point is more important than it sounds. A receipt may show a purchase, but not why it was ordinary and necessary for a business. A bank statement may show a deposit, but not whether it was income, a transfer, a gift, or loan proceeds. Examinations often turn on context as much as paper.
What Happens During The Examination?
During the examination, the IRS reviews the materials provided and compares them with the return. In a correspondence audit, that review usually happens by mail, sometimes followed by additional written questions or telephone follow-up. In an in-person audit, the IRS examiner may ask about business operations, accounting methods, or how particular figures were calculated.
The IRS says the length of an audit varies based on the type of audit, the complexity of the issues, the availability of requested information, scheduling, and whether the taxpayer agrees with the findings (IRS audits).
The National Taxpayer Advocate’s 2025 Annual Report to Congress reported that the average days to audit completion declined from 259.9 days in FY 2023 to 249.9 days in FY 2024 and 228.3 days in FY 2025, suggesting that examination timelines can still stretch across many months even as average closure times improve (National Taxpayer Advocate 2025 Annual Report to Congress).
Can The IRS Ask To Extend The Time Limit?
Yes. The IRS explains that if an audit is not resolved, it may ask the taxpayer to extend the statute of limitations for assessment. In general, the IRS says the assessment period is generally three years after a return is due or filed, whichever is later, though there are exceptions (IRS audits).
The IRS also states that a taxpayer does not have to agree to extend that period. At the same time, the IRS notes that if no extension is agreed to, the examiner may make a determination based on the information then available (IRS audits).
That can be a consequential moment in the case, because it often affects how much time remains to gather records, explain disputed items, or evaluate the proposed changes with a representative.
What Rights Does A Taxpayer Have During An Audit?
This is one of the most important parts of the process. The IRS states that Publication 1, Your Rights as a Taxpayer explains taxpayer rights and the processes for examination, appeal, collection, and refunds (About Publication 1).
According to the IRS audit guidance, those rights include:
- The right to professional and courteous treatment
- The right to privacy and confidentiality
- The right to know why the IRS is asking for information, how it will be used, and what may happen if it is not provided
- The right to representation
- The right to appeal disagreements within the IRS and before the courts (IRS audits; Publication 1)
For many people, the right to representation is the turning point. An IRS examination can start as a records issue and evolve into a legal and strategic issue if questions of substantiation, timing, characterization of income, or penalties begin to surface. In those situations, some taxpayers explore whether a tax attorney, CPA, or enrolled agent can help present the facts more clearly and keep the scope of the examination from becoming more difficult than it already is.
How Does An Audit End?
At the end of the examination, the IRS generally reaches one of three broad outcomes:
No Change
The IRS accepts the return as filed on the issues examined.
Agreed Change
The IRS proposes changes and the taxpayer agrees with them.
Unagreed Change
The IRS proposes changes and the taxpayer does not agree.
The IRS Data Book shows that examinations do not all end the same way. In FY 2024, some examinations resulted in recommended additional tax, while others resulted in recommended refunds (IRS Data Book 2024). That reinforces a point beginners often miss: an audit is a review process, and the outcome depends on the facts, records, and law tied to the items under examination.
What If The Taxpayer Disagrees With The IRS?
If the taxpayer disagrees with the IRS findings, the next question is often whether the case can go to the IRS Independent Office of Appeals. The IRS says Appeals may be available when all of the following are true:
- The taxpayer received a letter explaining appeal rights
- The taxpayer disagrees with the IRS decision
- The taxpayer has not signed an agreement form (Considering an appeal)
The IRS also explains that Appeals is a separate and independent office designed to resolve disputes without litigation where possible (Appeals). At the same time, the IRS notes that Appeals is generally not the right path if the taxpayer simply received a bill with no appeal language, failed to provide supporting information during the audit, or is concerned only about the ability to pay (Considering an appeal).
That distinction matters. If the disagreement is factual or legal, Appeals may become part of the path forward. If the issue is payment, different IRS processes may apply.
Can Taxpayers Get Help During An Audit?
Yes. The IRS says taxpayers may represent themselves or have an authorized representative handle the matter (IRS audits; Taxpayers can appeal when they disagree with an IRS decision).
There is also the Taxpayer Advocate Service, an independent organization within the IRS that assists eligible taxpayers, especially where there is financial hardship, repeated failed attempts to resolve an issue, or a system or process problem (Taxpayer Advocate Service; TAS overview).
In practical terms, representation can be especially relevant when:
- The audit involves a business or self-employment issues
- The IRS is questioning large deductions or credits
- The examination starts expanding to other years or entities
- Penalties are being discussed
- There is an unagreed report and appeal rights are approaching
Why The Examination Process Can Become Bigger Than It First Looks
A beginner’s guide would be incomplete without this reality: many audit cases are not just about paperwork. They can become questions about how the return was prepared, how transactions were characterized, whether records match the story being told, and whether the audit stays limited or broadens.
That is why even a routine-looking records request can carry more significance than people expect. The IRS’s own guidance says audits may be conducted by mail or in person, may involve questionnaires, may request additional documentation, and in some settings may expand beyond the original return year (IRS audits; Audits Records Request; Review of Requested Items in Audits).
For that reason, some taxpayers in similar situations look for counsel early, especially where the audit involves substantial dollars, multiple years, business entities, or a concern that casual explanations could make the case harder to unwind later.
A Short Summary For Beginners
An IRS audit is a formal examination of a tax return. It usually starts with a mailed notice, not a phone call. The IRS may conduct the review by correspondence or through an in-person interview. The process often centers on records, explanations, and whether the items on the return can be substantiated. Taxpayers have important rights during the examination, including the right to know why information is being requested, the right to representation, and the right to appeal many disagreements.
For some people, the examination remains narrow and resolves quickly. For others, it becomes a broader tax dispute with proposed changes, deadlines, and appeal considerations. If your situation feels more than routine, an attorney might help you determine how to protect the record, communicate strategically, and evaluate the next step based on the actual notice and facts involved.
Visit ReferU.AI to get matched with an attorney who has demonstrable experience in cases like yours — for free.
