How Long Does an IRS Criminal Investigation Take: DOJ Handoff

An IRS criminal investigation typically takes 12 to 24 months from the day the case is formally opened to the day special agents submit a prosecution recommendation. Simple cases can wrap in about six months. Cases with offshore accounts, shell entities, or multiple co-conspirators routinely run past three years. And that window covers only the investigative phase — once the case is referred to the Department of Justice, more months of review, and potentially a trial, come after.

What Fills Those Months

IRS Criminal Investigation (IRS-CI) is the law enforcement arm of the IRS, with roughly 2,100 special agents who investigate willful tax violations and related financial crimes.¹ Once a case is opened — usually through an internal referral from a revenue agent, a whistleblower tip, or information handed over by another federal agency — it lands with one or more special agents who build the case from the ground up.²

Evidence gathering is the longest single phase. Under 26 USC 7602, agents can summon any person to appear and produce books, papers, records, or other data relevant to a tax inquiry.³ In practice that means account statements, wire transfer logs, and loan applications from banks and brokerages, plus interviews with accountants, employees, and business associates. Interviews serve two purposes: they map the money, and they establish that the taxpayer acted intentionally.

When records don’t come voluntarily, or agents believe evidence is being hidden, they seek search warrants. A warrant requires probable cause that a crime occurred and that evidence will be found at the location searched.⁴ Agents can then seize documents, computers, and phones.⁵ Seized devices go through forensic examination, which can recover deleted files, hidden accounts, and encrypted communications. That work adds weeks or months on its own.

Why Offshore Cases Take Longer

Cases involving foreign accounts or foreign assets sit on the long end of the range for a specific reason: getting evidence out of another country is slow. Requests move through tax treaty exchange-of-information channels, coordinate with foreign governments, and route through the IRS Deputy Commissioner (International). The IRS’s own internal guidance tells agents to “start early” on international requests because responses can take weeks or months, and cooperation from foreign governments is never guaranteed.⁶ A single stalled information request can hold up an entire investigation.

What Pushes a Case Faster or Slower

The 12-to-24-month figure is a midpoint. A handful of variables move any given case toward one end or the other.

Financial complexity. A wage earner who underreported side-business income is a simpler case than someone using multiple LLCs, nominee accounts, and foreign trusts. Each additional layer multiplies the analysis.
Volume of evidence. Working through tens of thousands of transactions across multiple accounts and multiple tax years is painstaking, and forensic work on seized devices piles on top.
Cooperation. When taxpayers or witnesses refuse to cooperate, agents shift to grand jury subpoenas and court orders to compel testimony or records, which is slower than a voluntary interview.
Number of subjects. A single-taxpayer case moves faster than a conspiracy investigation with co-conspirators in different jurisdictions. More people means more interviews, more records, and more coordination.
International evidence. As above, overseas requests can add months by themselves.

The Civil Audit Running Alongside

Something worth knowing about the clock: the IRS can run a civil audit and a criminal investigation against the same taxpayer at the same time. The agency calls these “parallel investigations,” and they operate under specific coordination rules meant to keep the two tracks separate while preventing the civil side from undermining the criminal case.⁷

IRS-CI cannot direct the revenue officer’s work on the civil side, but the civil side must coordinate any taxpayer contact, enforced collection action, or settlement agreement with the Special Agent in Charge before proceeding. Civil activity may be temporarily suspended for up to 90 days while the criminal side reaches a critical point.⁷ The practical effect: someone who thinks they’re only dealing with an audit may discover a criminal investigation has been running quietly in parallel for months. By the time a special agent makes contact, substantial evidence is often already in hand.

After Agents Finish: The DOJ Adds Its Own Clock

When evidence gathering is done, the lead special agent writes a Special Agent Report (SAR) laying out the evidence, the findings, and the recommended charges.⁸ The SAR moves through a multi-level internal review inside IRS-CI. If the recommendation to prosecute survives, the agency’s Chief Counsel for Criminal Tax prepares a separate memo evaluating the legal merits and specific charges. The case is then referred to the DOJ Tax Division or, in some instances, directly to a U.S. Attorney’s Office.

That referral is not the end of the timeline. The DOJ designates each case as “complex” or “non-complex.” Non-complex cases must be considered by the U.S. Attorney’s Office within 90 days of receipt. Complex cases, which involve indirect methods of proof or sensitive legal issues, get a deeper review with no fixed deadline. Final authority to prosecute or decline a criminal tax case rests with the Assistant Attorney General of the Tax Division, not the IRS.⁹ If DOJ declines, or if IRS-CI itself concludes the evidence is insufficient, the criminal investigation closes and the file may go back to the civil division for taxes, interest, and civil fraud penalties.

How Far Back Charges Can Reach

Even a long investigation has an outer limit. The default statute of limitations for criminal tax offenses is three years from the date the offense was committed. For the offenses prosecutors actually pursue most often — tax evasion, filing a false return, fraud against the United States, and willful failure to file — the window is six years.¹⁰

The six-year clock starts on the date the fraudulent return was filed or on the statutory due date, whichever is later. File early, and the clock still starts at the due date. File late, and it starts the day you actually filed.¹¹ For failure to file, it starts on the return’s due date. The clock pauses entirely while the taxpayer is living outside the United States or is a fugitive from justice; that time does not count toward the six years.¹⁰

If a Special Agent Contacts You

The clearest sign the investigation involving you is criminal, not civil, is a specific warning a special agent must read before asking questions, even outside a formal arrest. The IRS’s non-custodial warning tells you that under the Fifth Amendment you cannot be compelled to answer questions or provide information that might incriminate you, that anything you say or submit can be used against you in criminal proceedings, and that you have the right to consult an attorney before responding.¹²

By the time you hear that warning, months of investigative work have usually already happened. The right to counsel is the single most important thing to exercise at that moment. What sounds like a routine explanation can become evidence, and once it does, none of the time remaining on the investigation’s clock will help you take it back.

1
Internal Revenue Service. Criminal Investigation (CI) at a Glance
2
Internal Revenue Service. How Criminal Investigations Are Initiated
3
Office of the Law Revision Counsel. 26 USC 7602 – Examination of Books and Witnesses
4
Internal Revenue Service. Internal Revenue Manual 38.1.1 – Prereferral Assistance, Visitations and Investigative Tools
5
Internal Revenue Service. Internal Revenue Manual 9.4.9 – Search Warrants, Evidence and Chain of Custody
6
Internal Revenue Service. Internal Revenue Manual 35.4.5 – Evidence and Information from Abroad
7
Internal Revenue Service. Internal Revenue Manual 5.1.5 – Balancing Civil and Criminal Cases
8
Internal Revenue Service. Internal Revenue Manual 9.5.8 – Investigative Reports
9
U.S. Department of Justice. Justice Manual 6-4.000 – Criminal Tax Case Procedures
10
Office of the Law Revision Counsel. 26 USC 6531 – Periods of Limitation on Criminal Prosecutions
11
Department of Justice. Criminal Tax Manual 7.00 – Statute of Limitations
12
Internal Revenue Service. Internal Revenue Manual 9.4.5 – Interviews