IRS Criminal Investigation (CI) — Complete Practitioner Guide

Understanding IRS Criminal Investigation

IRS Criminal Investigation (CI) is the law enforcement arm of the IRS. CI special agents are federal law enforcement officers with authority to make arrests, execute search warrants, and serve subpoenas. CI investigates tax crimes including tax evasion (IRC §7201), filing false returns (IRC §7206), failure to file (IRC §7203), and money laundering. CI also investigates financial crimes that intersect with tax law — fraud, embezzlement, and identity theft.

CI is highly selective — it only pursues cases with a high probability of conviction. In FY 2024, CI initiated approximately 2,667 investigations, recommended 1,788 for prosecution, and achieved a conviction rate of over 90%. When CI is involved, the stakes are criminal prosecution, not just civil tax liability.

Signs That CI Is Involved

Practitioners must recognize the warning signs that a civil matter has become a criminal investigation. The following indicators suggest CI involvement:

The target letter: A target letter from the Department of Justice Tax Division notifies the recipient that they are a target of a federal grand jury investigation. Target letters are serious — they indicate that the government has substantial evidence of criminal conduct and is considering indictment. Upon receipt of a target letter, the client must immediately retain a criminal defense attorney. The civil tax practitioner should step back from all civil proceedings until criminal counsel is retained and has assessed the situation.

Practitioner Obligations and Limitations

Civil tax practitioners — CPAs, EAs, and non-attorney practitioners — have significant limitations in criminal tax matters. They are not authorized to represent clients in criminal proceedings, and their communications with clients may not be protected by attorney-client privilege. This creates serious risks in criminal tax cases.

Attorney-client privilege: Communications between an attorney and client are protected by attorney-client privilege — they cannot be compelled in court proceedings. Communications between a CPA or EA and a client are generally not privileged, except for limited tax advice under IRC §7525 (the "federally authorized tax practitioner" privilege). The §7525 privilege does not apply to criminal proceedings — it is limited to civil tax matters. This means that a CPA's workpapers and communications with a client can be subpoenaed in a criminal investigation.

Kovel arrangements: To extend attorney-client privilege to a CPA or EA working on a criminal tax matter, the attorney can retain the accountant under a "Kovel arrangement" — named after the Second Circuit case United States v. Kovel. Under a Kovel arrangement, the accountant works under the direction of the attorney, and the accountant's work product is protected by the attorney's privilege. This is the standard structure for criminal tax defense teams.

Voluntary disclosure: If a client has unreported income or unfiled returns and CI has not yet initiated an investigation, voluntary disclosure through the IRS Voluntary Disclosure Practice (IRM 9.5.11) may be available. Voluntary disclosure does not guarantee immunity from prosecution, but it significantly reduces the likelihood of criminal charges. The client must make a timely, accurate, and complete disclosure and pay all taxes, interest, and penalties.

Case Study: Recognizing a CI Referral During an Audit

Client profile: Michael D., age 52, restaurant owner. He was under examination by an IRS Revenue Agent for his 2020 and 2021 tax returns. The Revenue Agent had been asking increasingly detailed questions about cash receipts and had requested bank records going back 5 years. The RA then stopped scheduling meetings and the audit went silent for 3 months.

Warning signs: The practitioner recognized the warning signs: (1) the RA's focus on cash receipts and bank records suggested an unreported income theory; (2) the sudden silence after 3 months of active examination suggested a CI referral; (3) the RA had asked questions about Michael's intent — a classic fraud development technique.

Practitioner response: The practitioner immediately advised Michael to retain a criminal defense attorney. The attorney contacted the IRS and confirmed that the civil examination had been suspended pending a CI review. The attorney then worked with Michael to assess the exposure and develop a defense strategy. After a 6-month CI review, CI declined to pursue criminal charges due to insufficient evidence of willful intent. The civil examination resumed and was resolved through a settlement.

Key lesson: Practitioners who recognize CI warning signs early can protect their clients by ensuring criminal counsel is retained before the client makes any statements that could be used in a criminal prosecution.

Frequently Asked Questions