Federal agents can investigate you for as long as the statute of limitations for the suspected crime allows them to file charges, which is five years for most federal offenses but stretches to six or ten years for certain categories and never expires for a handful of the most serious ones.1Office of the Law Revision Counsel. 18 U.S. Code 3282 – Offenses Not Capital Several doctrines can also pause or restart that clock, so the practical window during which the feds can be building a case against you is often longer than the statute alone suggests. And you may never know an investigation is underway, because prosecutors have no obligation to tell you.
The Default Five-Year Deadline
For most non-capital federal crimes, prosecutors have five years from the date the offense was committed to return an indictment. Miss that window, and they lose the ability to prosecute.1Office of the Law Revision Counsel. 18 U.S. Code 3282 – Offenses Not Capital The five-year rule is the baseline for drug offenses, most fraud, firearms violations, and the broad run of federal criminal statutes that don’t have their own limitations period.
The deadline is about fairness. Memories fade, witnesses move or die, records disappear. But five years is the maximum for filing charges, not for the investigation itself. Agents can spend four years and eleven months quietly building a case, file the indictment on the last available day, and only then let you know charges exist.
Crimes With Longer or No Time Limits
Congress has written longer windows into specific statutes where evidence is harder to develop or the offense is especially serious.
Tax Crimes
Most criminal tax offenses carry a six-year statute of limitations. That covers tax evasion, filing a fraudulent return, willfully failing to file or pay, and conspiring to defraud the IRS.2Office of the Law Revision Counsel. 26 U.S. Code 6531 – Periods of Limitation on Criminal Prosecutions Less serious tax offenses have a three-year baseline, but the six-year window covers the violations that IRS Criminal Investigation typically pursues. The criminal deadline is separate from the civil audit window, which follows its own rules.
Financial Institution Fraud
Fraud that targets a financial institution gets a ten-year limitations period. That includes bank fraud and any mail or wire fraud that affects a bank, credit union, or similar institution.3Office of the Law Revision Counsel. 18 U.S. Code 3293 – Financial Institution Offenses The same ten-year window covers embezzlement from a bank, false entries in bank records, and racketeering tied to bank fraud. The longer deadline reflects how long it can take to trace money through complex financial systems.
No Deadline at All
Some federal offenses can be charged at any time. Any offense punishable by death has no statute of limitations.4Office of the Law Revision Counsel. 18 U.S. Code 3281 – Capital Offenses Terrorism offenses that caused or created a foreseeable risk of death or serious bodily injury also have no deadline.5Office of the Law Revision Counsel. 18 U.S. Code 3286 – Extension of Statute of Limitation for Certain Terrorism Offenses Neither do child kidnapping and most federal child sexual abuse and trafficking offenses.6Office of the Law Revision Counsel. 18 U.S. Code 3299 – Child Abduction and Sex Offenses For these categories, evidence surfacing decades later can still lead to charges.
When the Clock Starts Later Than You Think
The limitations period generally runs from the date the crime was committed. For ongoing criminal activity, that date can arrive far later than people expect.
Conspiracy
Federal conspiracy is one of the most commonly charged offenses, and it gives prosecutors a real timing advantage. For a conspiracy that requires an overt act, the limitations period doesn’t start until the date of the last overt act in furtherance of the conspiracy.7United States Department of Justice. Criminal Resource Manual 652 – Statute of Limitations for Conspiracy If you joined a scheme years ago but a co-conspirator took a step to advance it last month, the five-year clock may have just restarted for everyone involved.
Continuing Offenses
Some crimes are treated as continuing offenses, meaning they aren’t complete until the last illegal act occurs. Courts apply the doctrine to offenses that by their nature involve sustained conduct rather than a single act. When prosecutors can characterize an offense that way, every day of ongoing activity pushes the deadline further out.
What Can Pause the Clock
Even after the limitations period starts running, several mechanisms can stop it.
Fleeing From Justice
If you flee to avoid prosecution, the statute of limitations stops entirely. The statute is blunt: no limitations period applies to a person fleeing from justice.8Office of the Law Revision Counsel. 18 U.S. Code 3290 – Fugitives From Justice The clock stays frozen until the person is located or surrenders. Leaving the country to avoid a known investigation is the clearest example, but courts have applied the provision in less obvious situations as well.
Foreign Evidence Requests
When evidence sits overseas, prosecutors can ask a federal court to suspend the limitations period while they pursue a formal request to a foreign government. The suspension starts when the request is made and ends when the foreign authority responds, capped at three years total across all requests for a given offense.9Office of the Law Revision Counsel. 18 U.S. Code 3292 – Suspension of Limitations to Permit United States to Obtain Foreign Evidence For an offense with a five-year deadline, that can effectively give prosecutors up to eight years.
Tolling Agreements
Sometimes the person under investigation agrees to pause the clock. That sounds counterintuitive, but there is a strategic logic. When the limitations period is about to expire, prosecutors face a choice: indict now with the case they have or let the deadline pass. A tolling agreement gives both sides room. The defense may use the extra time to present evidence that convinces prosecutors to decline, to negotiate a resolution, or to avoid a rushed and potentially overbroad indictment. These agreements are voluntary and typically negotiated through counsel.
Sealed Indictments
A grand jury can return an indictment that stays sealed, kept secret until the defendant is arrested or a court orders it unsealed. For limitations purposes, the indictment is generally considered filed when the grand jury returns it, not when it becomes public.10Congressional Research Service. Statute of Limitation in Federal Criminal Cases: An Overview Prosecutors can file a sealed indictment on day 1,825 of a five-year period and unseal it months later. From your vantage point, the investigation still looks open; charges have technically already been filed. Some courts have pushed back when sealing appears tactical rather than a genuine effort to prevent flight, but the practice is well established.
You Often Won’t Know You’re Being Investigated
The Department of Justice classifies people involved in a federal investigation into three categories, and where you fall affects what the government owes you in the way of notice.
- A target is someone the prosecutor or grand jury has substantial evidence linking to a crime, and who is a likely defendant.
- A subject is someone whose conduct falls within the scope of the investigation but hasn’t risen to target status.
- A witness is someone with relevant information who isn’t suspected of criminal involvement.
DOJ policy requires that targets and subjects called before a grand jury receive an advice-of-rights notification covering the right to counsel and Fifth Amendment protections.11United States Department of Justice. Justice Manual 9-11.000 – Grand Jury When a target is not called to testify, prosecutors are encouraged, but not required, to notify the target before seeking an indictment so the person can present their side. That notification often takes the form of a target letter. In many cases, especially where prosecutors believe notice could prompt flight or destruction of evidence, no advance warning is given at all.
Your status can shift as the investigation develops. A witness can become a subject as new evidence emerges, and a subject can become a target. The reverse also happens, particularly when a subject cooperates.
Investigations end in one of two ways: charges or no charges. When prosecutors decline, they have no obligation to tell you. You may spend months or years wondering whether charges are coming, and the answer might be that the government quietly moved on without ever letting you know.