There is a particular feeling that comes with finding an IRS envelope in your mailbox. The return address alone tightens your shoulders. You open it, you read words like “examination,” “information document request,” or “proposed adjustments,” and your brain starts running in three directions at once — What did I do wrong? How much will this cost? Should I call them right now?

Slow down. Before you call the IRS, before you fax anything, before you start digging through old shoeboxes of receipts, there are seven things you should do first. Done in the right order, they often determine whether you walk out of this audit owing nothing, owing what was actually proposed, or owing far more than necessary because of avoidable mistakes.

This guide walks through exactly what to do in the first days after an audit letter arrives. It is written for taxpayers — individuals, business owners, and self-employed professionals — not for tax pros. By the end, you will know which letter you actually received, what the IRS is really asking for, what deadlines are running, and how to avoid the early missteps that hurt audit outcomes more than the underlying tax issue ever does.

First, Understand What an IRS Audit Actually Is

An IRS audit — officially called an examination — is the IRS’s formal review of a tax return to verify that income, deductions, credits, and other items were reported correctly. Audits come in three flavors, and the type matters because each has its own procedures, timelines, and risks.

Correspondence audit (mail audit)

The most common type. You receive a letter, usually focused on one or two specific items — charitable contributions, mortgage interest, dependents, business expenses, the Earned Income Tax Credit, or a 1099 mismatch. You respond by mail or fax. Most CP2000 notices and IRS Letter 566 examinations begin this way. They sound routine, but they can grow into much larger issues if handled poorly.

Office audit

You are asked to come to an IRS office, usually a Taxpayer Assistance Center, with specific records. Office audits cover more issues than correspondence audits and are conducted by a Tax Compliance Officer. They are common for Schedule A itemized deductions, Schedule C self-employment income, and rental real estate.

Field audit

The most serious. A Revenue Agent comes to your business, your home, or your representative’s office. Field audits are typically reserved for businesses, complex returns, high-income individuals, and cases the IRS believes warrant a deeper look. Field audits routinely expand into multiple years and related entities.

Knowing which type of audit you are facing is step one. The strategy, the timeline, and the documentation effort vary dramatically. A correspondence audit treated like a field audit is overkill; a field audit treated like a correspondence audit is a disaster.

The 7 Things You Should Do Before You Respond

1. Read the Letter Carefully — Then Read It Again

Almost every audit mistake I see in my practice starts with a taxpayer who skimmed the letter, saw a number that scared them, and reacted to that number rather than to what the IRS actually said. IRS letters are written in a specific format that rewards careful reading.

Look for and write down:

The letter or notice number, printed in the upper-right corner. Common audit-related letters include CP2000, CP2501, Letter 525, Letter 566, Letter 915, Letter 950, Letter 2205, and Letter 3572. Each one means something different.
The tax year or years under examination.
The specific items being questioned (e.g., “Schedule C gross receipts,” “charitable contributions,” “dependency exemption for [name]”).
The response deadline. This is the single most important date in your file.
Whether the letter is a proposal (you can disagree) or a determination (your appeal rights are limited).
The contact information for the examiner — name, employee ID, phone, fax, and mailing address.

Do not assume the letter says what you think it says. A CP2000 “proposed change” is not a bill — it is the IRS’s opening position, and it is often wrong. A Letter 950 (30-day letter) is a proposal you can challenge in Appeals before tax is assessed. A Letter 3219 (90-day letter, also called a Statutory Notice of Deficiency) is the gateway to U.S. Tax Court and has a hard 90-day deadline that cannot be extended for any reason. Confusing these letters is one of the most expensive mistakes in tax practice.

2. Identify Every Deadline — and Calendar Them Today

IRS deadlines are not suggestions. Some can be extended with a phone call. Others, like the 90-day deadline on a Statutory Notice of Deficiency, are jurisdictional — missing them eliminates important rights forever.

Common audit-related deadlines and what they mean:

CP2000 / CP2501 response date — typically 30 days. Missing it usually triggers automatic assessment of the proposed tax.
Information Document Request (Form 4564) deadline — usually 30 days, often extendable. Persistent non-response can lead to summonses.
30-day letter (Letter 525, 950, 1912, etc.) — 30 days to file a written protest and request Appeals. Missing it doesn’t end your rights, but it forces you onto a harder path.
90-day letter / Statutory Notice of Deficiency (Letter 3219, Letter 531) — 90 days (150 if addressed to a person outside the U.S.) to petition U.S. Tax Court. Missing this deadline means the tax is assessed and your only remaining option is to pay and sue for refund in District Court or the Court of Federal Claims.
Statute of limitations on assessment (IRC § 6501) — generally three years from the date the return was filed, six years if there is a substantial omission of income, and unlimited for fraud or unfiled returns. Examiners often request extensions on Form 872 — those decisions matter.

Put every date on your calendar with a buffer of at least 7 to 10 days. Then set a second reminder a week before that. Audits are won and lost on the calendar.

3. Verify the Letter Is Legitimate

IRS impersonation scams remain one of the most common consumer frauds in the country. Before you do anything else, confirm the letter is real.

Real IRS audit letters:

Arrive by U.S. mail, almost without exception. The IRS does not initiate audits by email, text message, or social media.
Reference your specific tax year and Social Security number or EIN, partially redacted.
Include a notice or letter number in the upper-right corner that you can verify on the IRS website.
Request payment, if any, only to “United States Treasury” — never to a person, a third-party processor not listed on irs.gov, or via gift cards, wire transfers, or cryptocurrency.
Provide an IRS phone number you can verify by calling the IRS main line at 800-829-1040 (individuals) or 800-829-4933 (businesses).

If anything looks off, do not call the number on the letter — call the IRS main line directly, give them the letter number, and confirm whether it was issued. Five minutes of verification can save you from handing your data to a scammer.

4. Stop — Do Not Call the Examiner Yet

This is the single most important sentence in this article: do not call the IRS examiner the day you receive the letter.

I know that feels counterintuitive. The natural instinct is to pick up the phone, explain yourself, clear up the misunderstanding, and move on with your life. In a correspondence audit, that instinct is almost always a mistake. In an office or field audit, it can be catastrophic.

Why? Because IRS examiners are trained interviewers. They ask open-ended questions. They take notes. They look for inconsistencies between what you say and what is on the return. They are required to consider expansion of the audit when something new comes up. A 20-minute phone call where you “just try to explain” can produce admissions about other tax years, related entities, cash income, foreign accounts, payroll practices, or asset transfers that the examiner had no reason to ask about — until you brought them up.

Under IRC § 7521(b)(2) and Circular 230, you have the right to representation. Once you sign a Form 2848 Power of Attorney designating an Enrolled Agent, CPA, or attorney, the IRS communicates with your representative — not with you. Your representative can call the examiner, set the tone, scope the audit, and respond to questions in writing where every word is considered.

If you must speak with the examiner before you have representation — for example, to confirm receipt of a letter — keep the conversation short, polite, and procedural. Confirm you received the letter, confirm the deadline, and tell the examiner you will be responding through representation. Do not discuss substance. Do not answer “just a couple of quick questions.” Do not agree to a meeting date until you have spoken with a tax pro.

5. Pull and Review Your Original Return Before You Touch a Single Receipt

You cannot defend a return you don’t remember. Before you start gathering documents the IRS asked for, sit down with the actual return that’s being audited — every page, every schedule, every form — and reconstruct in your own mind why each number is what it is.

Pay particular attention to:

The line items the IRS is questioning. Do you remember how the number was calculated? Where did it come from?
Items adjacent to what the IRS is questioning. If they’re looking at charitable contributions, are mortgage interest and unreimbursed employee expenses also vulnerable? Auditors expand.
Anything that looks unusual at a glance. A large casualty loss, a Schedule C with zero income, a rental with consistent losses, a high charitable percentage relative to income — these draw attention even if they’re fully supportable.
Items where the documentation may be weak. Cash contributions over $250 without a written acknowledgement, vehicle expenses without a mileage log, business meals without context, home office without measurements — all common audit losses for taxpayers who are otherwise honest.

If you used a tax preparer, request the preparer’s workpapers. If you used software, pull the underlying inputs. If neither is available, request an account transcript and a return transcript from the IRS — those are your record of what was filed and what was assessed. Knowing your own return cold is the foundation of every successful audit defense.

6. Gather Documentation — Carefully and Selectively

The instinct in an audit is to gather everything you can find and send it all to the examiner to show good faith. That instinct is wrong, and it is one of the costliest mistakes I see.

Here is the right approach:

Respond only to what was asked. If the IRS asked for documentation of charitable contributions, send documentation of charitable contributions — not bank statements, not credit card statements, not the rest of your life. Information you send becomes part of the case file and can be used to expand the audit.
Organize the documentation. Examiners process dozens of cases. A binder or PDF with a clear table of contents, a tab for each issue, totals that tie to the return, and supporting documents in a logical order will be reviewed differently than a shoebox of receipts. Make their job easy and they will be more receptive.
Reconstruct missing records before you concede. Lost receipts are not the end. Bank statements, credit card statements, mileage apps, calendars, email confirmations, and vendor records can rebuild documentation. The Cohan rule (from Cohan v. Commissioner, 39 F.2d 540) sometimes allows reasonable estimates for ordinary business expenses where exact records are unavailable, though it does not apply to items with strict substantiation rules under IRC § 274 (travel, meals, entertainment, listed property).
Never alter or fabricate records. It is hard to overstate how much damage a doctored receipt or a recreated mileage log presented as contemporaneous can do. The IRS sees a lot of audits. They recognize fabrication. Fabrication transforms a civil audit into a potential fraud case under IRC § 6663 or worse.
Make complete copies for yourself. Send copies to the IRS, never originals. Keep a complete duplicate set of everything you submit, including the cover letter and the certified mail receipt.

7. Engage a Qualified Representative Before You Respond

This is not a sales pitch. It is the practical observation, after more than two decades of representing taxpayers, that audits handled by qualified representatives produce dramatically better outcomes than audits handled solo — not because the IRS is unfair to unrepresented taxpayers, but because the rules of the road are technical, the language matters, and the dynamics of the examination change once a representative is involved.

A qualified representative for IRS examinations is one of three credentials:

Enrolled Agent (EA) — a federally licensed tax practitioner with unlimited rights to represent taxpayers before the IRS in all 50 states under Treasury Department Circular 230. EAs are tested specifically on tax law and tax procedure.
Certified Public Accountant (CPA) — state-licensed accounting professionals with unlimited representation rights before the IRS. Best when the audit also involves complex financial accounting or audited financial statements.
Tax Attorney — licensed attorney with unlimited representation rights. Best when there is potential criminal exposure, U.S. Tax Court litigation is likely, or attorney-client privilege is essential.

Anyone else — a bookkeeper, a financial planner, an unlicensed “tax preparer,” a national “tax relief” call center salesperson — either cannot represent you in a real audit or should not. Always check the credential of the specific person who will be on your Form 2848. Their license, not the firm’s logo, is what matters.

Frequently Asked Questions

Q1. Why was I selected for an audit? Did I do something wrong?

Probably not. The IRS selects returns through several methods, most of which have nothing to do with wrongdoing. The Discriminant Inventory Function System (DIF) scores returns based on statistical norms; returns that look unusual relative to peers get a higher score. Document matching programs flag mismatches between W-2s, 1099s, K-1s, and what was reported on the return. Related examinations pull in returns connected to a taxpayer already under audit. Random sampling under the National Research Program selects returns for compliance research.

Selection alone is not an accusation. It is a question. The right response is to answer the question accurately and concisely — not to panic, and not to confess to imagined sins.

Q2. Can the IRS audit me for tax years I thought were closed?

Generally, the IRS has three years from the date a return was filed to assess additional tax (IRC § 6501(a)). The clock extends to six years if there is a substantial understatement of gross income (more than 25%, under IRC § 6501(e)) and is unlimited for fraudulent returns or unfiled returns.

Examiners frequently request extensions of the statute of limitations on Form 872. Whether to consent is a strategic decision, not a courtesy. Refusing can force the examiner to issue a Statutory Notice of Deficiency on incomplete information, which sometimes works in your favor and sometimes does not. Make this decision with representation, not on impulse.

Q3. The letter says I owe a lot of money. Should I just pay it to make this go away?

Almost never — at least not before the audit is properly worked. CP2000 and Letter 525 amounts are the IRS’s opening position, calculated by computer or by an examiner working with limited information. In my experience, those numbers are reduced significantly in a meaningful percentage of cases through proper documentation, accurate reconciliation, application of correct law, or both.

Paying immediately is appropriate only when (a) you have reviewed the proposal carefully with a representative, (b) you agree the math is right, (c) you have considered penalty abatement opportunities, and (d) you understand whether paying admits issues that affect other years or related taxpayers. Otherwise, paying first and challenging later is a much harder path than challenging first and paying any final number.

Q4. What about penalties? Can those be reduced?

Often, yes. Common penalties in audit cases include the accuracy-related penalty under IRC § 6662 (typically 20% of the underpayment), the failure-to-file penalty under IRC § 6651(a)(1), and the failure-to-pay penalty under IRC § 6651(a)(2). Each can be challenged on grounds such as reasonable cause, reliance on a competent tax professional, substantial authority, adequate disclosure, or first-time abatement.

Penalty defense is its own discipline. Many audits that look like losses on the underlying tax issue end up with significantly reduced total liability because penalties were properly contested. This is rarely done well by an unrepresented taxpayer because the technical standards (e.g., Treas. Reg. § 1.6664-4 reasonable cause analysis) are demanding.

Q5. Can the audit expand to other years or other issues?

Yes. Examiners are required to consider audit expansion when significant issues surface. A correspondence audit on a single year’s charitable contributions can become a multi-year office audit covering Schedule C, rental real estate, and unreported income if the examiner sees a pattern. Field audits often start with one year and expand to two or three.

This is exactly why the temptation to “just send everything” in response to a narrow request is so dangerous. Every additional document is an invitation to expand. A disciplined response that fully addresses the issues actually raised — nothing more, nothing less — is your best protection against expansion.

Q6. What if I disagree with the auditor’s findings?

Disagreement is not the end of the road — it is, in many cases, the beginning of the most productive part of the case. Your options after an unfavorable examiner’s report typically include:

Closing conference with the examiner. A final discussion to resolve issues directly with the examiner before the report goes out.
Request a meeting with the examiner’s group manager. Often available informally and sometimes very effective for cases where reasonable disagreement exists.
Written protest and Appeals. In response to a 30-day letter, you can file a written protest requesting consideration by the IRS Independent Office of Appeals — a separate function that resolves cases based on the “hazards of litigation.” Appeals is where many cases are settled at far better terms than the examiner offered.
S. Tax Court petition. In response to a Statutory Notice of Deficiency (90-day letter), you can petition Tax Court without paying the proposed tax first. This is a hard 90-day deadline.
Pay and sue for refund. After paying, you can file a refund claim and, if denied, sue in U.S. District Court or the Court of Federal Claims.

Each path has different procedures, evidentiary rules, and costs. Choosing among them is a strategic decision that should be made with representation.

Q7. The IRS asked for my QuickBooks file. Do I have to give it to them?

This question comes up constantly, and the answer is more nuanced than “yes” or “no.” In a field audit of a business, the IRS is increasingly asking for backup files of accounting software — QuickBooks, Xero, Sage, and similar. Their position is that the file is part of the books and records they have authority to examine.

In reality, accounting files often contain personal information, transactions for unrelated entities, prior years not under examination, and notes that may be protected. Handing over an unfiltered file is rarely the right move. A qualified representative can negotiate scope — producing reports rather than the file itself, limiting to the year(s) under exam, and removing irrelevant information — while staying within the rules of IRC § 7602 and the Internal Revenue Manual.

Q8. Can the IRS audit me in person if I don’t want them to?

In a correspondence audit, no — the audit is conducted by mail. In an office audit, you can often have your representative attend in your place once a Form 2848 is on file. In a field audit, the IRS has the right to examine books and records where they are kept (IRC § 7605), but “where they are kept” can often be at your representative’s office rather than your home or business. This is a meaningful protection — and one most taxpayers don’t know they have.

The Most Common Mistakes Taxpayers Make in IRS Audits

After two decades of representing taxpayers, I can predict how an audit will go based largely on what the taxpayer did in the first two weeks. The mistakes below are the ones that turn manageable cases into expensive ones.

Mistake 1: Ignoring the letter.

Audits don’t go away. Ignored letters become defaults. Defaults become assessments. Assessments become liens, levies, and Revenue Officer cases. Engagement is always cheaper than avoidance.

Mistake 2: Calling the examiner without preparation.

Already covered above, but it bears repeating: every word said to an examiner becomes part of the file, and IRS examiners are trained to listen for what was not said as well as what was.

Mistake 3: Sending too much documentation.

“I have nothing to hide” is a fine sentiment and a poor audit strategy. Examiners cannot expand into issues they don’t see. Sending more than was requested is one of the most common ways audits get bigger.

Mistake 4: Sending too little documentation — or none at all.

The opposite mistake is also common. If you cannot substantiate a deduction, do not just refuse to respond. Engage with the issue, reconstruct what you can, and concede in writing what you must — ideally as part of a broader resolution. Silence reads as disregard, and disregard supports the accuracy-related penalty under IRC § 6662.

Mistake 5: Reconstructing records dishonestly.

Recreating a mileage log from credit card statements is acceptable. Backdating a mileage log to look contemporaneous is not. The IRS sees fabrication regularly and treats it as a fraud indicator. There is no upside that justifies the risk.

Mistake 6: Missing the 30-day or 90-day deadline.

These deadlines are the gateway to Appeals and to Tax Court, respectively. Missing them collapses your options to the most expensive paths — paying first, suing later, or trying to negotiate post-assessment with no procedural leverage.

Mistake 7: Hiring the wrong representative.

National “tax relief” firms with aggressive television advertising have produced some of the worst audit outcomes I’ve been brought in to fix. Watch for: salespeople who are not the person who will represent you, large upfront fees with vague deliverables, promises about outcomes before any document review, and an inability to tell you who specifically will sign your Form 2848. Your representative’s name and credential is on the form. Make sure you know who they are.

Mistake 8: Letting the audit drift.

Audits without a representative tend to drift. Examiners get busy, deadlines slip, requests pile up, and what should have been a 90-day matter becomes a year-long ordeal that picks up additional issues along the way. A represented audit moves on a defined timeline toward a defined resolution. That alone often saves clients more than the cost of representation.

Your First Week Checklist

If an IRS audit letter arrived this week, here is your week-one playbook in priority order:

Day 1: Open the letter. Identify the letter number, tax year, and deadline. Verify the letter is legitimate by calling the IRS main line.

Day 1–2: Calendar every deadline with at least a 7–10 day buffer. Set a second reminder a week before each.

Day 2–3: Pull the original return. Review every line item being questioned. Note items adjacent to those being questioned.

Day 3–4: Engage qualified representation. Sign Form 2848 with an Enrolled Agent, CPA, or tax attorney.

Day 4–5: Begin gathering documentation — only what was requested, organized cleanly. Reconstruct missing records honestly.

Day 5–7: Coordinate with your representative on response strategy, scope, and any extension requests. Confirm the response will go out well before the deadline, by certified mail with proof of delivery.

Why Clients Choose My Firm, Mike Habib, EA

My firm, Mike Habib, EA, is a tax representation practice based in Whittier, Los Angeles County, California, serving clients in all 50 states and Americans living overseas. I am a federally licensed Enrolled Agent with more than 20 years of experience handling IRS, FTB, EDD, and CDTFA examinations, audit defense, collections, and complex tax planning.

Before building this practice, I served as Controller at Xerox Corporation and Director of Finance at AEG. That corporate finance background means I read financial statements, general ledgers, payroll registers, and accounting files the way an examiner reads them — which makes a measurable difference when defending a Schedule C, a rental portfolio, an S-Corp, or a multi-state business under audit.

Clients who hire my firm work directly with me. Not a salesperson. Not a junior staff member. Not a rotating call center. The Enrolled Agent on your Form 2848 is the same person who reads your file, calls the examiner, drafts the protest, and — if it comes to it — represents you in IRS Appeals.

My fees run $400 to $500 per hour, compared to $850 to $1,500 per hour at large national firms, and many engagements are handled on a flat-fee basis so you have cost certainty from day one. The goal is straightforward: a defensible audit outcome, no surprises, and your life back.

If you have an IRS audit letter in hand, the most valuable thing you can do today is get a clear read on what you’re facing before the deadline runs. Visit myirstaxrelief.com or call my office at 1-877-788-2937. We can review the letter, confirm what is actually being asked, lay out your real options, and — if you choose to engage — step in with a Form 2848 so the examiner is talking to me, not to you.