The Supreme Court gave federal agencies a green light decades ago that still shapes how investigations get built: civil and criminal cases can run on the same conduct at the same time, so long as the target can’t show substantial prejudice. That’s how a tax matter turns into an IRS civil audit, an IRS Criminal Investigation file, and a Justice Department grand jury inquiry all at once. It’s also how a securities question can pull in the SEC’s Enforcement Division and a U.S. Attorney’s Office on the same afternoon.
The person on the receiving end rarely sees any of that coordination. They see a civil letter one week, a subpoena the next, a knock at the door months later. The question worth sitting with is how the two modes, civil and criminal, feed each other, and when each one is the bigger threat.
The civil track looks polite, the criminal track doesn’t
A civil investigation feels administrative. You get information document requests, deposition notices, deadlines you can negotiate, and lawyers on the other side who return your calls. The criminal track feels nothing like that. Agents show up unannounced, warrants get executed at homes and offices, and the government tells you almost nothing about what it already knows.
The trap is assuming the polite track is the safe one. Statements made to civil investigators can be handed to criminal prosecutors later, and the target often has no idea a criminal file was opened alongside the civil one. That gap between what feels routine and what’s happening behind the scenes is where most of the damage gets done.
The IRS runs both sides of the same case
Tax matters are the clearest example of parallel machinery inside a single agency. The Internal Revenue Manual permits civil revenue officers and Criminal Investigation special agents to work the same conduct at the same time, with coordination meetings baked into the process. Revenue officers chase the money. Special agents build the potential prosecution.
For the taxpayer, a civil examiner who suddenly goes quiet is not always good news. A pause in civil activity can signal that a criminal referral is under review. The polite letter and the grand jury subpoena sometimes come out of the same agency, weeks apart, built on the same records.
The SEC and DOJ share facts, but not freely
Securities cases run on a different structure. The SEC handles civil enforcement, the DOJ handles criminal prosecution, and while they cooperate closely, the rules on what can pass between them are stricter than most people assume. The SEC can’t run an investigation purely to feed the DOJ, and grand jury material generally can’t move the other direction without a court order.
That legal wall matters in practice. A witness who sits for SEC testimony is usually warned, through Form 1662, that anything they say can end up in a criminal case. The Ninth Circuit in United States v. Stringer held that this disclosure alone was enough notice, and that the SEC had no obligation to reveal a parallel criminal investigation. Silence is legal.
Leaning into the civil process cuts both ways
Sometimes cooperating with the civil side is the right call. Fines, disgorgement, and consent decrees hurt, but they end the matter. If the underlying conduct is genuinely a compliance failure and the government’s theory is thin on intent, cooperating on the civil track can close the file before it ever becomes a criminal one.
That same instinct can backfire badly. When criminal exposure is real, every civil answer, every produced document, and every deposition transcript becomes evidence. The decisions that shape the outcome usually get made in the first few weeks, before most people have called counsel:
- Assume parallel tracks exist． If one agency is asking questions about conduct that could carry criminal exposure, work from the assumption that another agency is already looking, whether or not anyone has told you.
- Slow the civil clock． Extensions, narrowed requests, and privilege review buy time to understand what the government actually has before you hand over more.
- Separate the witnesses from the custodians． Producing documents is a different decision from putting an employee in a chair to answer questions. Handle them independently.
- Preserve everything． Deleting records after an inquiry begins turns a bad case into a much worse one. Litigation holds go out early, in writing.
Coordinated on paper, uneven in practice
The Justice Department’s own guidance encourages criminal prosecutors and civil trial counsel to coordinate on parallel matters to the fullest extent the law allows. In practice, that coordination is uneven. Some U.S. Attorney’s Offices run tight joint task forces with the SEC or IRS. Others barely talk to the civil side until charges are close.
That uncertainty is the argument for getting experienced counsel in early rather than late. A firm that handles federal investigation defense reads the signals across agencies, not the letter in front of you, and can push back on civil demands without giving up ground on the criminal side.
The mistake is treating three separate letters as three separate problems. They’re usually one problem with three faces.
This content is provided for informational purposes only and is not a substitute for professional advice. AFP editorial staff were not involved in the creation of this content.
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