Sam Brotman, J.D., LL.M.

Tax Attorney · California Bar #274966 · Brotman Law · San Diego

What an IRS Special Agent Is

The IRS has two main enforcement divisions that interact with taxpayers. Revenue agents conduct civil audits. Special Agents work for IRS Criminal Investigation (IRS-CI) and investigate potential criminal violations of the federal tax code and related statutes.

Special Agents are federal law enforcement officers. They carry badges and firearms and have the authority to execute search warrants, issue grand jury subpoenas, and make arrests. Their investigations produce criminal referrals to the Department of Justice for prosecution.

If a Special Agent has contacted you — or has contacted your attorney, your CPA, your bank, or your employer — you are potentially the subject of a criminal tax investigation.

The distinction between a revenue agent and a Special Agent is not subtle. Revenue agents issue appointment letters through standard IRS correspondence and conduct their examinations through established audit procedures. Special Agents show up in person, present credentials, and conduct interviews as federal investigators. If the person contacting you identifies as a Special Agent, calls from an IRS-CI field office, or references a criminal investigation, that’s a materially different situation from a civil audit.

IRS-CI has approximately 2,000 Special Agents operating through 21 field offices nationwide. They investigate roughly 2,000 to 3,000 cases per year and refer the majority for prosecution. The conviction rate in IRS-CI prosecuted cases is historically over 90%. These are not statistics designed to frighten — they’re context for why representation matters from the moment of first contact.

Common IRS Criminal Investigation Targets

IRS-CI investigates violations under Title 26 (the Internal Revenue Code) and frequently works alongside other federal agencies on related statutes. Common investigation types include:

• Tax evasion (IRC §7201) — willful attempt to evade or defeat a tax
• Filing false returns (IRC §7206(1)) — willfully making and subscribing a return known to be false
• Failure to file (IRC §7203) — willful failure to file, pay, or supply information
• Employment tax fraud — failing to collect, account for, or pay over trust fund taxes
• Money laundering with tax components — often joint investigations with IRS, FBI, or DEA

Beyond these core categories, IRS-CI increasingly investigates cryptocurrency tax evasion, offshore account concealment (often alongside FBAR violations under Title 31), ERC fraud, and pandemic-era relief fraud. Joint investigations with the FBI, DEA, and Homeland Security Investigations are common when the underlying conduct involves both tax violations and other federal crimes.

The “willfulness” element is central to most criminal tax charges. The government must prove that the taxpayer knew they had a legal duty and intentionally chose to disregard it. This is what separates a criminal tax case from a civil deficiency — the government isn’t just saying you owe more tax, it’s saying you deliberately tried to evade your legal obligation. That standard is harder to prove than a civil underpayment, but IRS-CI builds their cases carefully before making contact.

Related: Criminal Tax Defense · Eggshell Audit Defense

What to Do When Contact Is Made

Do not speak with the Special Agent without counsel present. This is the most important immediate step. Special Agents are trained interviewers. They will present themselves professionally and ask questions that seem reasonable. The answers you provide — and what you don’t say — form part of the investigation record. You have a Fifth Amendment right to remain silent, and you should exercise it.

Do not contact the IRS on your own to “clear things up.” Voluntary statements to federal investigators can constitute admissions. There’s no way to explain away a criminal tax investigation with a phone call.

Preserve documents. Do not destroy, alter, or transfer documents, records, or data. Obstruction of justice is a separate federal crime under 18 U.S.C. §1519. Leave your records as they are.

Retain criminal tax counsel immediately. A criminal tax attorney can — and should — communicate with the investigating agents on your behalf, assess the scope of the investigation, and manage the document flow and any grand jury proceedings.

The correct response to a Special Agent’s request for an interview is brief: “I’d like to speak with my attorney before speaking with you.” No further explanation is required. You do not need to explain why, justify the exercise of your rights, or say anything that could be interpreted as a statement about the underlying matter. The agent may tell you that cooperation will help your situation. That may or may not be true in a specific case, and an attorney can evaluate it. You cannot evaluate it at the door.

What Happens in the Investigation

IRS-CI investigations typically begin long before the first taxpayer contact. Agents review transcripts, financial records, informant tips, or referrals from civil examination before approaching anyone. By the time a Special Agent appears, the investigation may have been running for a year or more.

After the investigation, IRS-CI either closes the case (decline prosecution) or refers it to the Department of Justice Tax Division for prosecution. The taxpayer has no right to know the current status of the investigation — which is why counsel who can communicate with the agents directly is essential.

The eggshell audit scenario — where a civil examination is running concurrently with a criminal investigation, or where civil becomes criminal — requires careful management. Statements made in a civil examination can be used in a criminal proceeding. This is where attorney representation from the beginning, not after the fact, matters most.

The timeline of a criminal tax investigation varies significantly. Simple cases — unfiled returns, clear-cut omissions — may be resolved quickly. Complex cases involving multiple years, business structures, and financial transactions may take several years from initial investigation to indictment. During that period, the target typically has no official notice that they’re under investigation. A proffer or voluntary disclosure, if appropriate, is something a criminal tax attorney evaluates based on the specific facts — not something to pursue without experienced counsel.

If IRS-CI closes the investigation without a referral, the civil case may still proceed. A declination to prosecute criminally doesn’t mean there’s no civil liability. The IRS can still assess tax, penalties, and interest on the underlying deficiency. The criminal and civil tracks are separate, and closing one doesn’t resolve the other.

Related: ERC Criminal Defense