IRS Criminal Tax Guide

IRS Criminal Investigation: Tax Crimes, Special Agents and Disclosure

By Ray Neu, Publisher | Last reviewed: October 26, 2026 | Reading time: 9 min

Short answer

IRS Criminal Investigation (IRS-CI) is the IRS division whose special agents investigate possible tax crimes. Unlike an audit, a case can end in a prosecution recommendation to the Justice Department. Willful tax evasion is a felony under 26 U.S.C. § 7201, and § 6531 allows 6 years to charge evasion and the other offenses it lists.

Below: the statutes, willfulness, fraud referrals, special agent contact and voluntary disclosure, sourced to the tax code, the Internal Revenue Manual (IRM), irs.gov and DOJ.

Deadline to know: In the Voluntary Disclosure Practice, IRM 9.5.11.9.1 requires Part II of Form 14457 within 45 days after written confirmation of preclearance. One additional 45-day extension may be granted on written request.

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How IRS Criminal Investigation differs from an audit

The IRS calls CI its “criminal investigative arm,” and its special agents are “the only federal law enforcement agents with investigative jurisdiction over violations of the Internal Revenue Code.” An IRS audit or collection case is civil. The Fraud Handbook (IRM 25.1.1.3.2) says civil fraud brings “remedial action,” such as civil penalties, while criminal penalties are fines or imprisonment and “are enforced only by prosecution.” One offense “may result in both civil and criminal penalties.”

At least two layers of CI management review and approve opening a “subject criminal investigation,” which can involve witness interviews, search warrants and bank subpoenas. It ends either discontinued or in a “special agent report” recommending prosecution, and any level of review may decline it. After referral, “the investigation is managed by the prosecutors.”

The main criminal tax statutes

Each requires willful conduct. Figures are statutory maximums, not sentences imposed.

Statute	What it covers	Maximum fine and prison term stated
§ 7201, evasion	Willfully attempting “in any manner to evade or defeat any tax”	Felony: $100,000 ($500,000 for a corporation), 5 years, or both, plus costs
§ 7202, failure to collect or pay over	Willfully failing to collect, or truthfully account for and pay over, a required tax	Felony: $10,000, 5 years, or both, plus costs
§ 7203, failure to file or pay	Willfully failing to pay tax, file a return, keep records or supply information	Misdemeanor: $25,000 ($100,000 for a corporation), 1 year, or both, plus costs; a willful § 6050I violation is a felony with up to 5 years
§ 7206(1), false return	Willfully signing a return under penalties of perjury not believed “true and correct as to every material matter”	Felony: $100,000 ($500,000 for a corporation), 3 years, or both, plus costs
§ 7206(2), aiding or assisting	Willfully aiding or advising a materially false return, even if the taxpayer did not know	Same as § 7206(1)
§ 7207, fraudulent documents	Willfully giving the IRS a document known to be false	$10,000 ($50,000 for a corporation), 1 year, or both

Fines can run higher. IRM 9.1.3 says 18 U.S.C. § 3571 raises the maximum fines to $250,000 for individuals and $500,000 for corporations under §§ 7201, 7202 and 7206, and to $100,000 and $200,000 for a § 7203 misdemeanor.

Section 7202 cases usually involve employers and withheld employment taxes, the IRM says; see our guide to payroll taxes and the trust fund recovery penalty. Under IRM 25.1.2, § 7206(2) can reach “lawyers, accountants, return preparers, and appraisers who counsel on a course of action.”

Tax evasion vs. tax avoidance

The IRM is direct: “Avoidance of tax is not a criminal offense.” One who avoids tax “does not conceal or misrepresent.” Evasion “involves some affirmative act,” such as deceit, subterfuge, camouflage or concealment.

What “willful” means, and civil fraud vs. prosecution

IRM 9.1.3 defines willfulness as “the voluntary, intentional violation of a known legal duty” and says “mere understatement of income and the filing of an incorrect return does not in itself constitute a willful attempt to evade tax.” For failure to file, willful means “voluntary, purposeful, deliberate, and intentional, as distinguished from accidental, inadvertent, or negligent.” The IRS voluntary disclosure page adds: “Willfulness is not simply making a mistake.”

Civilly, 26 U.S.C. § 6663 adds 75 percent of the portion of an underpayment attributable to fraud, and once the IRS shows any portion is fraud, the whole underpayment is treated as fraud unless the taxpayer proves otherwise by a preponderance of the evidence. Per IRM 25.1.1.3.1, criminal guilt must be proven “beyond a reasonable doubt” and civil fraud “by clear and convincing evidence,” the burden resting on the government in both.

How a civil exam can become a criminal referral

CI cases can begin when “a revenue agent (auditor), revenue officer (collection) or investigative analyst detects possible fraud.” The Fraud Handbook separates mere indicators from affirmative acts (firm indications), and “Fraud cannot be established without affirmative acts of fraud.” The sequence:

Indicators. The examiner documents them and consults a group manager, then a fraud enforcement advisor (IRM 25.1.2.2).
Fraud development. A written plan is made to document any affirmative acts.
Suspension. Once affirmative acts are established, the employee “must suspend collection or examination activity.”
Referral. If criminal criteria are met, the advisor recommends referral to CI on Form 2797 (IRM 25.1.1.2).
Civil route. Otherwise, or if CI returns the case, the IRS considers the civil fraud penalty or the fraudulent failure to file penalty under § 6651(f).

A suspended audit, a special agent’s card, or a disclosure question?

A free, confidential evaluation can go over these procedures.

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When an IRS special agent makes contact

The IRS describes special agents as sworn federal law enforcement officers and “the only armed IRS employees.” They may visit or call unannounced, but they do not work civil tax cases or demand payment. They present law enforcement credentials, and the IRS-CI Employee Verification tool can confirm identity, though not during every enforcement action. The IRS also warns that a call, email or text that is unexpected, threatening or “Demands payment now” is not from it.

At a first interview with the subject of an investigation, IRM 9.4.5.8.3.1.1 has the agent display credentials and badge and read an advisement: “under the Fifth Amendment to the Constitution of the United States, I cannot compel you to answer any questions or to submit any information if such answers or information might tend to incriminate you in any way.” It adds that statements may be used in a criminal proceeding and that the person may seek an attorney before responding. The agent “will immediately terminate the interview” if the subject wishes to withhold testimony or consult an attorney. Grand jury investigations follow other procedures.

Statute of limitations for criminal tax offenses

Under 26 U.S.C. § 6531, charges must be brought within 3 years “next after the commission of the offense,” but within 6 years for listed offenses, including defrauding the United States, willful evasion, aiding a false return, willfully failing to pay tax or make a return, offenses under §§ 7206(1) and 7207, and conspiracy to evade under 18 U.S.C. § 371. Time outside the United States or as a fugitive is not counted. Per IRM 9.1.3, 3 years applies to information returns, records and supplying information.

Sources differ on § 7202. IRM 9.1.3 gives the Justice Department’s position that the period is six years under § 6531(4), and notes that two federal district courts have concluded it is three.

The IRS voluntary disclosure practice

IRM 9.5.11.9 describes the Voluntary Disclosure Practice as a way for “taxpayers with criminal exposure” to come into compliance “and potentially avoid criminal prosecution.” It is for willful violations; for non-willful conduct the IRM points to amended or past due returns (see unfiled tax returns). Illegal source income is excluded.

It is not immunity. A disclosure “will be considered along with all other factors” in deciding whether to recommend prosecution, the practice “creates no substantive or procedural rights,” and CI decisions on timeliness and acceptance cannot be appealed. It must be truthful, complete and timely, meaning received before the IRS has:

started a civil examination or criminal investigation, or said it intends to;
received information from a third party, such as an informant, another agency or the media; or
obtained related information from an enforcement action, such as a search warrant or grand jury subpoena.

Full cooperation, all returns for the disclosure period and arrangements to pay in full are also required. The irs.gov page words the timeliness conditions slightly differently, citing a John Doe summons.

The two-part Form 14457 process

Part I requests preclearance, which checks eligibility and timeliness but does not assure acceptance. Part II, due within 45 days, requires a narrative signed under penalties of perjury. On approval, CI issues a Preliminary Acceptance Letter and sends the case to a civil examiner; failure to cooperate can lead to revocation.

Civil penalties: current terms and a pending proposal

Under the Form 14457 instructions (Rev. 7-2025), the disclosure period is generally six years, and a civil fraud penalty under § 6663 or fraudulent failure to file penalty under § 6651(f) “will apply to at least one year” (the highest-liability year in its examples), in place of accuracy-related and delinquency penalties for the others. Willful FBAR penalties apply where supported.

A December 22, 2025 IRS proposal would instead use failure-to-file penalties for delinquent returns, a 20-percent accuracy-related penalty for amended returns, penalties up to $10,000 per international information return per year, and full payment within three months. The IRS says it creates no rights for those who applied before it is finalized; the Taxpayer Advocate Service reported in August 2026 that final procedures had not been published. The irs.gov FAQ lists the 20-percent figures without labeling them proposed.

When an attorney matters

Under Circular 230 (31 CFR 10.3) and Publication 947, attorneys, CPAs and enrolled agents may all practice before the IRS. A criminal matter differs:

Confidentiality. Section 7525 extends attorney-style confidentiality to other federally authorized tax practitioners, but § 7525(a)(2) says it “may only be asserted in” noncriminal tax matters and proceedings.
Prosecutors decide charges. The IRS sends tax prosecution recommendations to the “Department of Justice, Tax Division,” or a U.S. Attorney. The Justice Department now describes the Tax Section of its Criminal Division as “responsible for handling or supervising most federal criminal tax prosecutions.”

See tax attorney vs. CPA vs. enrolled agent and what an IRS tax attorney does.

Related guides

Frequently Asked Questions

What is the difference between tax avoidance and tax evasion?

The Internal Revenue Manual says avoidance is not a crime: it uses legitimate means and does not conceal or misrepresent. Evasion involves an affirmative act such as deceit or concealment, and a willful attempt is a felony under 26 U.S.C. § 7201.

Do IRS special agents demand payment?

No. The IRS says CI special agents do not work civil tax cases or demand payment, and that a call, email or text demanding payment now is not from the IRS.

How long does the government have to bring criminal tax charges?

Under 26 U.S.C. § 6531, generally 3 years, but 6 years for listed offenses including evasion, willful failure to pay tax or file a return, false returns under § 7206(1), and aiding a false return.

Does a voluntary disclosure prevent prosecution?

Not necessarily. IRM 9.5.11.9 says a disclosure is considered along with all other factors and is no assurance of immunity from prosecution. CI decisions cannot be appealed.

Can a civil audit become a criminal case?

Yes. Under IRM 25.1.2, once affirmative acts of fraud are established, the examination is suspended, and a CI referral is recommended if criminal criteria are met.

Questions about a criminal tax matter?

A free, confidential evaluation can go over IRS-CI contact, a fraud referral or a voluntary disclosure.

Start Your Free Evaluation Call (202) 968-1121

About the Author

Ray Neu

Ray Neu is the publisher of IRSAttorneys.net. A former law enforcement officer with a background in criminal justice and digital publishing, he oversees editorial direction, partnership standards, and compliance review for the site. He is not an attorney and does not provide legal advice; all tax law content is sourced and reviewed against the standards documented on the Editorial Team & Standards page.

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Sources

IRS Circular 230 Disclosure: To ensure compliance with Treasury Department rules governing tax practice, any tax information contained on this website was not written and is not intended to be used, and cannot be used, for the purpose of avoiding any federal tax penalty. You should consult a licensed tax professional regarding your individual situation.

Results described on this website are not a guarantee, warranty, or prediction of the outcome of any tax matter. Every situation is different. Prior results do not guarantee a similar outcome. Article content reflects general information about federal tax procedure as of the last reviewed date and may not reflect subsequent changes in IRS policy, regulations, or case law.