If you receive an IRS audit notice, it is not a random piece of mail. It is the government’s formal announcement that it is questioning the accuracy of your return and, in many cases, evaluating whether your conduct was merely mistaken or potentially fraudulent. An IRS audit is an examination of your books, accounts, and financial records to verify that the tax reported on your return is correct under federal law. For clients who have taken aggressive positions, underreported income, claimed dubious credits, or simply “fudged the numbers,” an audit notice is often the first visible sign of a high-risk civil examination that could evolve into an eggshell or reverse eggshell audit and, in the worst cases, a criminal tax investigation.
At the Tax Law Offices of David W. Klasing, we focus on precisely these types of high-stakes situations. Understanding what your audit notice is, what it is not, and how it fits into the broader examination process is the first step in protecting both your net worth and your liberty.
How IRS Audit Notices Work and Which Ones Really Matter
The IRS issues hundreds of letters and “CP” notices, and not every letter is a proper audit notice. Some simply confirm a refund change or request identity verification. When we talk about “audit notices,” we are usually dealing with a handful of categories that signal the IRS is formally questioning your return:
Initial Examination Letters
For many individuals and small businesses, the first indication of an audit is a correspondence exam notice in the Letter 566 series. These letters state that your return has been selected for examination and list the items that are being verified, often including credits, dependents, Schedule C expenses, or other specific issues. In practice, Letter 566 serves as both a notice of audit and a request for documentation supporting the items under review.
Notice of Audit and Examination Scheduled / Letter 2205 series
In office and field audits, you will often receive a letter titled “Notice of Audit and Examination Scheduled” or a Letter 2205 variant. These letters tell you that your return has been selected for an in-person examination, identify the years and issues under review, and set an appointment at an IRS office or your business. In-person office and field exams are significantly more intrusive than correspondence exams and are frequently used in higher-risk cases.
Underreporter Notices (CP2000)
Notice CP2000 is generated when IRS computer systems detect that income or other data reported by third parties, such as employers and financial institutions, does not match what you reported. Technically, a CP2000 is not an audit but a proposed adjustment based on those mismatches. In practice, however, it serves a similar function: it lays out the IRS’s proposed changes and gives you a chance to agree, dispute, or provide additional documentation. Mishandling a CP2000 can result in a formal assessment and, in some cases, trigger a complete examination.
30-day Letters and Examination Reports
As examinations proceed, the IRS may issue “30-day letters” that include an examination report and give you 30 or 45 days to agree, provide additional information, or request a conference with the IRS Independent Office of Appeals. These letters are a critical turning point. If the IRS’s position is fundamentally flawed or overreaches the law and facts, failing to respond can allow those proposed adjustments and penalties to harden into the government’s default position.
Statutory Notice of Deficiency (CP3219A)
If issues are not resolved at the examination or Appeals level, the IRS may issue a Notice of Deficiency, most commonly in the form of CP3219A. This “90-day letter” is your legal notice that the IRS intends to assess additional tax, and it explains your right to file a petition in the U.S. Tax Court within 90 days of the notice date, or 150 days if the notice is addressed to you outside the United States. Missing this deadline usually means losing your pre-payment forum and allowing the IRS to assess its version of your liability.
Each of these notices carries its own deadlines and implications. Some can be handled through targeted documentation and negotiation. Others, particularly a Statutory Notice of Deficiency, may require a strategic decision whether to litigate in Tax Court. Across all of them, what you say and what you produce becomes part of a permanent record that can be reviewed later by IRS Criminal Tax Investigation and the Department of Justice if your case has fraud implications.
Indicators That an Audit Notice May Signal Higher-Risk Or Criminal Tax Exposure
Not every audit notice means you are headed toward a criminal tax investigation. Many examinations are resolved as routine civil matters, even where additional tax is ultimately due. However, certain patterns in the notices and the surrounding facts should prompt immediate caution and professional representation:
Multiple Years and Broad Issues
If the notice indicates that several years are under examination, or that multiple areas such as income, cost of goods sold, and cash deposits are being reviewed simultaneously, the IRS may be looking at broader patterns rather than a single mistake.
Field or In-Person Office Exam Focused on a Cash-Intensive Business
Field audits conducted at your business or home are generally reserved for more complex or higher-dollar cases. Cash-intensive industries and self-employed taxpayers who have historically underreported income account for a large share of the fraud cases the IRS pursues.
Requests for Complete Accounting Files and Bank Records
When an initial audit notice or follow-up information document request demands full QuickBooks or other general ledger files, extensive bank and credit card statements, and source documents across many categories, the examination team may be evaluating whether your books can support reported income and deductions under traditional forensic accounting methods, such as the bank deposits or net worth approaches that are also used in criminal tax prosecutions.
History of “Fudging” or Unresolved Noncompliance
If you know that prior returns involve unreported cash, fabricated deductions, or omitted foreign accounts, a seemingly routine audit notice should be treated as the front end of a potential eggshell audit. In its public guidance, the IRS’s Office of Fraud Enforcement specifically trains examiners to identify “indicators” and “affirmative acts” of fraud and, where present, to consult Fraud Enforcement Advisors about possible criminal referrals.
Once a civil audit is referred to IRS Criminal Investigation, the rules change dramatically. CI’s published statistics consistently reflect conviction rates near 90 percent in cases it chooses to prosecute, with billions of dollars in financial crimes identified each year. The safest course is to structure your audit response from day one as if CI and a federal prosecutor may ultimately review the file.
What You Should and Should Not Do When You Receive An IRS Audit Notice
When a new client brings us an audit notice, our first advice is simple: do not ignore it and do not handle it alone. The IRS stresses that carefully reading the notice, understanding the deadline, and responding promptly are essential to protecting your rights. But equally important is how you respond and through whom.
Some key principles apply in almost every serious audit:
Do Not Call the Examiner on Your Own to “Explain” the Return
Anything you say can be documented and used against you if the case later takes on a criminal tax dimension. Examiners and revenue officers are trained to probe intent when they see patterns of underreporting or inconsistent statements.
Do Not Assume Your Original Preparer is the Right Advocate
Conversations with a nonlawyer preparer are generally not protected by the attorney-client privilege, and preparers under scrutiny can have every incentive to preserve their own license and reputation at the client’s expense. If the audit reveals false entries or fabricated deductions, your preparer may become a witness against you rather than an ally.
Centralize All Communications Through Experienced Counsel
When you retain the Tax Law Offices of David W. Klasing, your interactions with our dual-licensed Attorneys and CPAs are protected by the attorney-client privilege and the attorney work-product doctrine, as our CPAs are employees of the firm and part of the legal team. That allows you to speak candidly about what was actually done on prior returns so that we can design a defense strategy that is both realistic and protective.
Let Professionals Control Document Production and Narrative
Audit notices often include or are followed by detailed information document requests. We work with clients to determine which records must be produced, how to organize and present them, and when it may be appropriate to resist overbroad or misleading requests. The objective is to answer what must be answered, avoid volunteering damaging admissions or unnecessary detail, and present your story in a way that supports a defensible civil outcome while minimizing criminal tax risk.
Handled correctly, even a serious audit notice can be the starting point for negotiated resolution, limited adjustments, or, in some cases, litigation in the U.S. Tax Court if the IRS will not move off an unreasonable position. Handled poorly, it can be the first chapter in a life-altering criminal tax investigation.
Contact the Tax Law Offices of David W. Klasing if You Have Received an IRS Audit Notice
If you have just opened an IRS audit notice, or if multiple letters have already arrived and deadlines are approaching, you are at an inflection point. Responding late, responding carelessly, or relying on a nonlawyer preparer can lock you into a catastrophic result or, in cases involving badges of fraud, invite a criminal tax investigation by IRS Criminal Investigation and the Department of Justice.
At the Tax Law Offices of David W. Klasing, our dual-licensed civil and criminal tax defense Attorneys and CPAs focus on high-risk federal and California tax controversies, including IRS audits, eggshell and reverse-eggshell examinations, administrative appeals, and Tax Court litigation. We review your audit notice line by line, analyze the years and issues under scrutiny, compare the IRS’s focus with your actual reporting history, and build a strategy that protects both your net worth and your liberty. Because our CPAs are employees of the firm and function as part of your legal team, their forensic accounting and return reconstruction work is conducted within the umbrella of the attorney-client privilege and work product protections that you simply do not get by working directly with a stand-alone preparer.
If you have received an IRS audit notice or suspect that one may be on the way, contact the Tax Law Offices of David W. Klasing for a confidential, reduced-rate initial consultation. Call us at 800-681-1295 or complete our online contact form HERE to schedule an appointment. The sooner you put experienced, privileged representation between you and the IRS, the more options we will have to contain the audit, minimize civil damage, and guard against the risk of a life- and career-destroying criminal tax investigation or prosecution.
