How to Tell if Your IRS Audit Has Become a Criminal Investigation

If you're being audited by the IRS and you start noticing changes, a new agent suddenly involved, more probing questions about intent rather than amounts, requests for personal financial records that don't seem related to the issues, your audit may have crossed into a criminal investigation. The earlier you recognize the indicators of crossover, the more options you have to protect yourself, because the most effective defenses are the ones available before IRS Criminal Investigation makes its referral decision.

KEY TAKEAWAYS

• IRS Criminal Investigation (CI) is a separate division within the IRS that handles federal tax crime referrals and investigations.

• The transition from civil audit to criminal investigation often happens quietly, without any formal notice to the taxpayer that the case has changed character.

• The principal federal tax crimes are 26 U.S.C. § 7201 (tax evasion), § 7203 (failure to file or pay), and § 7206 (false statements on returns or to the IRS).

• Cases are tried in U.S. District Court, for Houston taxpayers, the Southern District of Texas.

• Eggshell audit dynamics, where a civil examination has criminal exposure embedded in the underlying facts, require careful coordination of civil and criminal defense strategy.

•The Kovel privilege is the mechanism for extending attorney-client privilege to a CPA's analytical work, and getting the engagement structure right matters.

What Is IRS Criminal Investigation?

IRS Criminal Investigation, generally referred to as IRS-CI, is the law enforcement arm of the IRS. It is staffed by special agents, federal law enforcement officers with badges and arrest authority, not the revenue agents who conduct civil examinations. CI investigates violations of the Internal Revenue Code and related financial crimes, develops criminal cases for prosecution, and refers cases to the Department of Justice Tax Division for indictment. The unit is small but consequential: CI brings only a few thousand cases per year nationally, and the prosecution rate on cases that proceed to indictment exceeds 90%.

CI cases originate from several sources. Some come from civil examination, a revenue agent in the IRS Examination Division identifies criminal indicators during an audit and makes a referral. Some come from the IRS Whistleblower Office under IRC § 7623. Some come from joint investigations with other federal agencies, the FBI, DEA, IRS-CI joint task forces on financial crime, or the U.S. Attorney's office on parallel investigations. Once CI accepts a case, the special agent assigned conducts a primary investigation, builds the evidence file, and recommends prosecution to the local United States Attorney.

What Are the Most Common Federal Tax Crimes?

Three statutes account for the substantial majority of criminal tax prosecutions. Each addresses a different type of misconduct, and the elements of proof differ in ways that shape defense strategy.

The willfulness element runs through all of the criminal tax statutes and is more demanding than the civil willfulness standard discussed in TFRP cases. Criminal willfulness under Cheek v. United States, 498 U.S. 192 (1991), requires the government to prove the defendant had a voluntary, intentional violation of a known legal duty. A genuine, good-faith misunderstanding of the law, even an unreasonable one, can defeat willfulness. That's why criminal tax defense often turns on what the defendant knew about the tax law and when they knew it, rather than on whether the underlying conduct happened.

What Triggers a Criminal Referral From a Civil Audit?

Most civil audits never become criminal cases. The vast majority of revenue agent examinations end with a no-change letter, a tax adjustment, or a civil penalty assessment. The audits that cross into criminal territory typically share common features that put the revenue agent on notice that something more serious is happening.

Common criminal referral triggers include patterns suggesting unreported income, large unexplained bank deposits, lifestyle inconsistent with reported income, off-the-books cash transactions identified through the bank deposits method or the cash expenditures method. False statements during the audit itself, including affirmative denials of facts the agent later proves through third-party records. Falsified documents, altered invoices, fabricated receipts, backdated documents. Patterns of activity suggesting concealment of assets, offshore accounts, nominee structures, structured transactions designed to avoid currency reporting under 31 U.S.C. § 5324.

When a revenue agent identifies these indicators, the agent generally suspends the civil examination and makes a referral to IRS Criminal Investigation. The referral is internal, the taxpayer is not told the audit has been suspended for criminal evaluation. The civil case sits in suspense while CI evaluates whether to accept the referral, and during that period the taxpayer may continue receiving routine civil correspondence that suggests the audit is still proceeding normally.

What Is an Eggshell Audit?

An eggshell audit is a civil examination in which the underlying facts contain criminal exposure that has not yet been recognized by the revenue agent. The audit is proceeding as a civil matter, but each interaction with the agent has potential criminal consequences if the agent identifies the embedded exposure. The metaphor is apt: every step has to be careful, because the wrong move can crack the shell and convert the civil audit into a criminal referral.

Eggshell audit dynamics arise in a wide range of settings. Unreported income discovered during routine examination. False statements on the original return that surface when the agent reconstructs the records. Documents produced in response to an Information Document Request that contain inconsistencies the agent can detect. Statements made during a taxpayer interview that contradict documentary evidence. Each of these creates the risk that the agent identifies the criminal exposure and refers the case.

Defending an eggshell audit is fundamentally different from defending an ordinary civil examination. The objective is no longer just minimizing the tax adjustment, it is preserving the criminal defense and avoiding admissions or document productions that would strengthen a future criminal case. That requires careful analysis at the start of the engagement to identify the criminal exposure, careful management of the document production to avoid producing privileged or incriminating materials, careful preparation of the taxpayer for any interview, and where appropriate, the use of the Fifth Amendment privilege against self-incrimination at strategic points in the audit.

The Kovel Privilege and Why Engagement Structure Matters

The Kovel doctrine, named after United States v. Kovel, 296 F.2d 918 (2d Cir. 1961), extends the attorney-client privilege to a CPA's analytical work when the CPA is engaged by the attorney as part of providing legal advice to the client. The privilege protects the CPA's work product and communications from disclosure to the IRS or to a grand jury, which can be the difference between a defendable case and an indictable one.

The Kovel structure requires three elements: (1) the CPA must be engaged by the attorney rather than directly by the client, (2) the CPA's work must be incident to and necessary for the attorney's legal advice, and (3) the engagement must be documented in a written engagement letter that establishes the legal-advice purpose. Without these elements, the CPA's work is treated as ordinary accountant work product and is fully discoverable by the IRS. Many criminal tax cases have been damaged because the taxpayer's pre-existing CPA continued working on the matter after criminal exposure became apparent, without the Kovel structure, every analysis the CPA produced is fair game in the criminal case.

This is one practical reason why dual-credentialed counsel matters in eggshell audit and criminal tax matters. A JD/CPA can perform much of the analytical work that would otherwise require a separate Kovel engagement of an outside CPA, and the privilege analysis is cleaner because the work is performed by the attorney directly. North Star Law Firm structures eggshell audit and criminal tax engagements to preserve privilege from the start, including establishing Kovel relationships with outside CPAs where the volume of analytical work warrants it.

What to Do if You're Contacted by an IRS Special Agent

If a person who identifies as an IRS special agent contacts you, or if a revenue agent on an existing audit suddenly steps back and a new agent is introduced who asks different kinds of questions, the right response is to engage criminal tax counsel before any further substantive communication. Special agents are law enforcement officers, their questions are designed to elicit admissions that will be used in a criminal case. Anything the taxpayer says to a special agent without counsel can be used in the case-in-chief at trial, and the special agent is under no obligation to advise the taxpayer of the right to counsel during a non-custodial interview.

The most important early action is to invoke the right to counsel and decline to answer questions until counsel is present. This is not an admission of wrongdoing, it is the standard practice of any sophisticated defendant in any criminal investigation. The special agent will document the invocation, but that documentation is generally not admissible against the taxpayer at trial, while uncounseled statements absolutely are.

Frequently Asked Questions

What's the difference between a civil audit and a criminal investigation?

A civil audit is conducted by a revenue agent in the IRS Examination Division and ends in a tax adjustment, civil penalty, or no change. A criminal investigation is conducted by a special agent in IRS Criminal Investigation and ends in either a declination, a civil referral back to Examination, or a recommendation for prosecution to the Department of Justice. Different agents, different procedures, different consequences.

What is § 7201 (tax evasion)?

26 U.S.C. § 7201 makes it a felony to willfully attempt to evade or defeat any federal tax. Conviction requires proof of (1) substantial tax due, (2) an affirmative act of evasion (not mere failure to file or pay), and (3) willfulness. Maximum penalty is five years imprisonment plus fines. § 7201 is the headline tax crime and the one most commonly charged in cases involving substantial unreported income or offshore concealment.

What is § 7203 (failure to file)?

26 U.S.C. § 7203 makes it a misdemeanor to willfully fail to file a required return, supply required information, or pay tax. Maximum penalty is one year imprisonment per count. Section 7203 is often used as the principal charge in cases where evasion is harder to prove but a clear pattern of nonfiling exists. Multiple-year nonfilers face cumulative exposure.

What is § 7206 (false statements)?

26 U.S.C. § 7206 has two key subsections. Section 7206(1) makes it a felony to willfully make and sign a return under penalty of perjury that the signer does not believe to be true and correct as to every material matter. Section 7206(2) makes it a felony to willfully aid in the preparation of a materially false return for another taxpayer. Maximum penalty is three years imprisonment per count.

Can my CPA represent me if my case becomes criminal?

A CPA can technically practice before the IRS in civil matters under Circular 230, but a CPA cannot represent a defendant in a criminal tax prosecution, that requires admission to the relevant federal court. More importantly, communications with a CPA outside a Kovel engagement are not privileged, which means anything you tell the CPA can be subpoenaed and used in the criminal case. Once criminal exposure is apparent, transition to criminal tax counsel and structure the CPA's continued involvement through a Kovel engagement.

What is a Kovel engagement?

A Kovel engagement, named after United States v. Kovel, 296 F.2d 918 (2d Cir. 1961), is the structure for extending attorney-client privilege to a CPA's work when the CPA is engaged by the attorney to assist in providing legal advice. The CPA must be engaged by the attorney (not the client), the work must be incident to legal advice, and the engagement must be documented in writing. Properly structured, a Kovel engagement protects the CPA's work product from IRS discovery.

What are the penalties for tax evasion?

Section 7201 carries a statutory maximum of five years imprisonment per count plus fines (up to $250,000 for individuals or $500,000 for corporations). Actual sentences depend on the U.S. Sentencing Guidelines, which calculate the offense level based on the tax loss, with adjustments for sophisticated means, abuse of trust, role in the offense, and acceptance of responsibility. Tax-loss-driven sentences typically produce 12 to 36 months of imprisonment for individual cases involving $100,000 to $500,000 of tax loss, with longer sentences for larger losses.

Next Steps for Houston Taxpayers Facing Criminal Exposure

If your civil audit shows signs of crossing into criminal territory, or if you've been contacted by an IRS special agent, the time to engage criminal tax counsel is now, not after the next interview, not after the next document request. North Star Law Firm represents Houston taxpayers on eggshell audit and criminal tax matters at flat fees with payment plans available. The combination of JD and CPA training, Tax Court admission, and bankruptcy court admission produces the analytical depth these cases require.

Flat Fees. No Hourly Billing. Payment Plans Available.

North Star Law Firm | Houston, Texas

Phillip Zagotti, JD/CPA | 832-384-4526

11740 Katy Freeway, Suite 1700, Houston, TX 77079