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What Criminal Tax Defense Covers
Criminal tax defense is representation in federal criminal investigations and prosecutions arising from alleged tax violations. The statutes involved are specific, the penalties are serious, and the government's conviction rate for cases it takes to prosecution is historically above 90%. The defense strategy depends on where in the process you are — preliminary inquiry, grand jury investigation, or indictment — and what exposure actually exists.
Here are the statutes we deal with most frequently, and what each one actually means:
26 U.S.C. § 7201 — Tax Evasion: A willful attempt to evade or defeat any tax imposed by the Internal Revenue Code. Felony. Up to five years imprisonment and a $250,000 fine. This is the most serious of the tax crimes. The government must prove willfulness — that you knew what you owed, and that you intentionally tried to avoid paying it. Willfulness is also where most defenses are built.
26 U.S.C. § 7203 — Failure to File, Pay, or Keep Records: Willful failure to file a return, pay a tax, or keep required records. Misdemeanor. Up to one year imprisonment. The government charges this in cases where it cannot prove evasion but can establish a pattern of deliberate non-compliance.
26 U.S.C. § 7206(1) — Filing a False Return: Willfully making and subscribing a return that contains a declaration under penalties of perjury that you did not believe to be true and correct. Felony. Up to three years imprisonment. This covers false deductions, understated income, and any material misstatement on a signed return.
26 U.S.C. § 7206(2) — Aiding or Assisting in Preparation of a False Return: Felony. Up to three years imprisonment. The government uses this to reach tax preparers, advisors, and others who participated in creating a false return — even if they did not sign it.
31 U.S.C. § 5324 — Structuring: Structuring cash transactions to evade bank currency reporting requirements (i.e., deliberately breaking up transactions to stay under the $10,000 reporting threshold). Common in cash-intensive businesses. Criminal structuring does not require that the underlying money came from illegal activity — the structuring itself is the offense.
18 U.S.C. § 371 — Conspiracy to Defraud the United States: Used frequently in tax cases when more than one party was involved. A conspiracy charge does not require that the underlying tax crime was completed — it requires only an agreement to commit a crime and an overt act in furtherance of it.
Who Investigates and Prosecutes Federal Criminal Tax Cases
IRS Criminal Investigation (CI) is the federal law enforcement division responsible for investigating potential criminal tax violations. CI special agents are armed federal law enforcement officers with arrest authority. They are not revenue agents. They have law enforcement training and criminal investigative powers. When a CI agent contacts you — even if they describe it as a "voluntary interview" — the conversation is evidence.
The IRS CI Los Angeles Field Office covers Southern California, including San Diego. Cases developed by CI are referred to the DOJ Tax Division or to the U.S. Attorney's Office for prosecution. Federal criminal tax cases in San Diego are prosecuted in the U.S. District Court for the Southern District of California, 333 W. Broadway.
How Criminal Tax Cases Develop
Most federal criminal tax cases begin as civil audits. The transition from civil to criminal is not abrupt — it follows a pattern you can recognize if you know what to look for.
The Civil-to-Criminal Referral Pathway
A revenue agent conducting a routine examination may notice patterns that suggest willful fraud: income substantially inconsistent with bank deposits, deductions for expenses that clearly did not occur, two sets of records, or unexplained cash flows. At that point, the revenue agent's job changes. They are no longer just adjusting a return — they are building a referral package.
The referral pathway works like this: the revenue agent refers the matter to CI for what CI calls "fraud development." CI conducts a preliminary inquiry to determine whether the evidence warrants opening a full investigation. If CI opens a full investigation, it may involve a grand jury, subpoenas, and formal interviews. Cases that CI develops to a sufficient level of evidence are referred for prosecution to the DOJ Tax Division or to the U.S. Attorney's Office.
The critical point is that this transition often happens while the civil audit is still open. The revenue agent may continue conducting the examination while CI is building its case in parallel. A taxpayer who does not know this is happening — or who responds to the revenue agent's questions without counsel — is generating evidence for both the civil and criminal case simultaneously.
Eggshell Audits — The Most Sensitive Representation Type
An eggshell audit is a civil examination where criminal exposure is already present before the audit begins. The revenue agent may or may not know it. The taxpayer usually does.
The goal in an eggshell audit is to resolve the civil examination without generating the evidence that CI would need to open a full investigation. That requires understanding precisely what the government needs to establish willfulness under § 7201 — and structuring the audit response so that the civil case closes, the adjustment is manageable, and no CI referral follows.
This is the most technically demanding type of tax representation. A mistake — the wrong document produced, the wrong explanation given to the revenue agent, a voluntary disclosure of something beyond the IDR's scope — can convert a manageable civil matter into a federal criminal prosecution. We have handled eggshell audits extensively. If you are in this situation, do not respond to the revenue agent before retaining counsel.
Grand Jury Subpoenas
If CI has opened a grand jury investigation, you may receive a grand jury subpoena for documents, records, or testimony. A grand jury subpoena is not voluntary. That said, your rights in responding to it are significant: you have Fifth Amendment protections for testimonial and incriminating production, the right to counsel before and during any testimony, and the right to challenge the subpoena's scope through a motion to quash.
Do not produce documents or appear before a grand jury without counsel. The way you respond to a grand jury subpoena — what you produce, in what form, and what you say — is itself evidence. We manage grand jury subpoena responses as part of criminal tax defense.
Target Letter, Subject Letter, Witness Letter — What Each Means
If the government's investigation focuses on you, you may receive one of three letters indicating your status in the grand jury proceeding:
A target letter means the government has substantial evidence that you committed a crime and considers you a putative defendant. This is the most serious status.
A subject letter means your conduct is within the scope of the grand jury's investigation, but the government has not yet made a determination about whether you are a target. Subject status can change.
A witness letter means you have information relevant to the investigation, but you are not currently a subject or target. Witness status does not mean you have no exposure — it means the government does not currently view you as a potential defendant.
Regardless of which letter you receive, retain counsel before responding to the government or testifying. A witness today can become a subject tomorrow if the testimony generates new evidence.
Attorney-Client Privilege in Criminal Tax Matters
Attorney-client privilege is your primary protection in a criminal tax matter. It applies to communications with your attorney. It does not apply to communications with your CPA.
The attorney-client privilege protects confidential communications between a client and their attorney made for purposes of obtaining legal advice. Your attorney cannot be compelled to testify about what you told them. This protection is absolute in its core application and survives the attorney-client relationship indefinitely.
CPA-client privilege under IRC § 7525 is far narrower. It covers federal tax advice in non-criminal matters only. It explicitly does not apply in criminal tax proceedings. That means your accountant can be subpoenaed and compelled to testify about what you told them, what they found in your books, and what conclusions they reached. Anything your CPA knows about your tax situation is potentially available to prosecutors.
The Kovel arrangement — from United States v. Kovel, 296 F.2d 918 (2d Cir. 1961) — solves this problem in the defense context. When we retain a forensic accountant under a Kovel letter, the accountant is working as an agent of the law firm for purposes of providing legal advice. Their work product and communications with us are protected by the attorney-client privilege. We use Kovel arrangements when forensic accounting work is necessary in a criminal tax defense — it allows us to get the accounting analysis we need without creating a privilege gap that prosecutors can exploit.
Fifth Amendment protections also matter in criminal tax cases. You have the right not to be compelled to be a witness against yourself. In practice, this means you can decline to answer questions in a voluntary CI interview, assert a Fifth Amendment privilege over documents that are testimonial and incriminating in nature, and decline to testify before a grand jury. The act-of-production doctrine — which recognizes that producing documents can itself be a testimonial act — is a live issue in cases involving personal records. Corporations and other entities have more limited Fifth Amendment protections; individuals have the full benefit.
What to Do If Contacted by IRS Criminal Investigation
If a CI special agent contacts you — by phone, at your door, or by letter — you are not obligated to speak with them. Coordinate any contact through counsel.
CI agents regularly conduct what they describe as "voluntary interviews." There is no legal compulsion to participate. That said, declining an interview is not the same as doing nothing — how you decline, what you say in declining, and what happens next all require legal judgment. The default is to say nothing and call counsel.
A few specific points:
Do not produce documents voluntarily. Document production in a criminal tax investigation should be reviewed before any disclosure. What you produce — and what you do not produce — is a strategic decision with legal consequences. Producing documents without counsel reviewing them first is the kind of mistake that is very difficult to undo.
Do not destroy or alter records. Obstruction of justice and evidence tampering are separate federal crimes that compound any underlying tax liability. If you have received any government contact indicating that an investigation is underway, preserve all records exactly as they are.
Federal criminal tax investigations are methodical. Your defense should be too. CI does not improvise. Neither should your response to CI contact.
How Brotman Law Handles Criminal Tax Defense
We handle criminal tax defense from preliminary CI inquiry through federal trial — and we manage the parallel civil matter at the same time.
Criminal tax defense is not just about defending against a prosecution. It is also about managing the civil examination that may be running in parallel, and about making strategic decisions at each stage that affect both tracks. Here is what our representation covers:
Preliminary investigation and CI contact: If CI has contacted you or is likely to, we get involved early. We manage all government contact, evaluate the scope of the investigation, and develop a defense strategy before the government's case is fully formed. Early involvement matters.
Grand jury defense: If a grand jury subpoena has been issued, we manage the response — including document review, privilege assertions, and representation in any grand jury testimony. We assess whether a motion to quash is appropriate and advise on Fifth Amendment protections.
Parallel civil defense: In eggshell audits and cases where a civil exam is open alongside a criminal investigation, we manage both. The goal is to resolve the civil matter in a way that does not generate additional evidence for the criminal case. This requires coordinating the civil and criminal strategy from the start — they cannot be handled independently.
Voluntary disclosure: For taxpayers who are considering coming forward before CI makes contact, the IRS Voluntary Disclosure Practice (updated November 2018) provides a pathway to resolve criminal exposure through a civil resolution with reduced risk of prosecution. Voluntary disclosure is not for everyone, and it is not available once a criminal investigation has already been opened. If you are considering it, we evaluate whether the facts and your specific situation make it a viable option.
Federal trial: If the case proceeds to indictment and trial, we defend in U.S. District Court for the Southern District of California. Criminal tax trials are technical — they involve complex financial records, expert witnesses, and IRS procedural issues. We prepare them as such.
For a deeper look at how the IRS's criminal investigation process works, see our Guide to IRS Criminal Investigations. For the civil audit side of any case with potential criminal exposure, see our IRS Audit Defense page.
If you have received CI contact, a grand jury subpoena, or a target or subject letter, book a free 15-minute call. We can discuss where you are and what the realistic options are.
Frequently Asked Questions
What is the difference between tax fraud and tax evasion?
Tax fraud is a broad term that covers any willful violation of the tax laws — filing a false return under 26 U.S.C. § 7206(1), aiding in the preparation of a false return under § 7206(2), or structuring transactions to evade reporting under 31 U.S.C. § 5324. Tax evasion under 26 U.S.C. § 7201 is the most serious of these — it requires proof of a willful attempt to evade or defeat a tax, not merely a false statement. Evasion is a felony with a five-year maximum sentence. The practical distinction matters because the government's proof requirements and your defense options differ significantly depending on which statute is at issue.
What happens when the IRS refers my case to Criminal Investigation?
When a revenue agent refers a matter to IRS Criminal Investigation, CI begins a preliminary inquiry to assess whether the evidence warrants a full investigation. If CI opens a full investigation, they may conduct covert surveillance, interview witnesses, issue summonses, and — if a grand jury is convened — issue subpoenas. The civil examination may continue in parallel. This is the stage where getting counsel involved early makes the most difference. Once CI opens a formal investigation, your options narrow as the government's case develops.
Can I still resolve my case civilly after CI is involved?
It depends on where in the process CI is. In some cases — particularly early-stage referrals where CI has not yet opened a full investigation — a civil resolution is still achievable, and managing the civil examination properly can prevent the referral from going further. Once CI has formally opened a criminal investigation, a purely civil resolution is much harder to achieve and requires a different kind of negotiation with both CI and the DOJ Tax Division. Voluntary disclosure under the IRS Voluntary Disclosure Practice may be relevant if CI has not yet made contact with you, but that window closes once CI opens an investigation.
What is an eggshell audit?
An eggshell audit is a civil IRS examination where criminal exposure already exists — typically because the taxpayer knows there are facts in the returns that, if the revenue agent uncovers them, could support a § 7201 evasion charge. The term comes from the fragility of the situation: one wrong step cracks it. The defense goal is to close the civil audit cleanly, at the lowest possible adjustment, without generating a CI referral. That means controlling document production carefully, managing what the revenue agent learns and in what order, and structuring the audit response so that willfulness is not apparent from the record. This is the most technically demanding type of audit representation we handle.
Do I have to talk to IRS Criminal Investigation special agents?
No. CI interviews described as "voluntary" are, in fact, voluntary — you are not legally required to participate. That said, how you decline matters, and declining without counsel present is still a judgment call with legal implications. The clearest rule is this: do not speak with CI special agents without counsel present. Coordinate any IRS contact through your attorney. This applies whether you believe you have anything to hide or not — what you say in a voluntary interview is evidence, and CI agents are trained interviewers.