Misprision of a felony is a federal crime that punishes someone who knows a federal felony has been committed, fails to report it promptly to authorities, and takes an affirmative step to hide it. The offense carries up to three years in prison and a fine of up to $250,000 under 18 U.S.C. § 4.1Office of the Law Revision Counsel. 18 USC 4 – Misprision of Felony2Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine It is a lower-tier felony that shows up most often in federal practice as a plea-down from more serious charges like obstruction of justice or accessory after the fact.
The Four Elements the Government Must Prove
Section 4 is a one-sentence statute, but courts have broken it into four elements, each of which the prosecution must establish beyond a reasonable doubt.1Office of the Law Revision Counsel. 18 USC 4 – Misprision of Felony
First, someone else must have actually committed a federal felony — an offense punishable by more than one year in prison under federal law.3Office of the Law Revision Counsel. 18 USC 3559 – Sentencing Classification of Offenses State felonies do not count, no matter how serious. Second, the defendant must have had actual knowledge the felony occurred. Suspicion or rumor is not enough. Third, the defendant must have failed to notify a federal judge or someone in civil or military authority “as soon as possible.” The statute sets no fixed deadline, but the phrase makes clear that delay matters. Fourth, the defendant must have taken an affirmative act to conceal the crime.
Drop any one of these and the charge fails. The combination of elements three and four is what gives the statute its real shape: it is aimed at people who go out of their way to keep federal law enforcement in the dark, not at bystanders who simply mind their own business.
What Counts as Concealment
The concealment element is where most of the real litigation happens. The Supreme Court confirmed in Roberts v. United States that misprision requires “both knowledge of a crime and some affirmative act of concealment or participation.”4Legal Information Institute. Roberts v United States, 445 US 552 (1980) Staying silent, by itself, is not a crime. You cannot be convicted under § 4 for simply knowing about a felony and choosing not to pick up the phone.
Qualifying conduct covers a wide range. Lying to federal agents during an interview is among the most common examples. Destroying or altering documents to hide financial fraud, cleaning a crime scene, hiding a weapon, intimidating witnesses, burying financial records, or using encrypted channels specifically to shield criminal proceeds all satisfy the element. The act does not need to be sophisticated or successful. Any deliberate step to keep the felony hidden counts.
The dividing line is between doing nothing and doing something. A person who watches a bank robbery and walks away without calling anyone has not committed misprision. A person who watches the same robbery and then tells investigators they were not present has crossed the line.
Penalties on Conviction
Misprision is classified as a Class E felony, the lowest tier of federal felonies, covering offenses punishable by more than one year but less than five years.3Office of the Law Revision Counsel. 18 USC 3559 – Sentencing Classification of Offenses1Office of the Law Revision Counsel. 18 USC 4 – Misprision of Felony2Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine Courts may also order restitution if the concealment caused direct financial loss to a victim.
How the Guidelines Calculate Prison Time
Federal judges do not pick a number out of the range at random. They apply the U.S. Sentencing Guidelines, and under §2X4.1, the misprision offense level is set nine levels below the offense level for the underlying felony, with a floor of 4 and a ceiling of 19.5United States Sentencing Commission. USSG 2X4.1 – Misprision of Felony The 19 ceiling matters because it caps the guideline calculation even when the concealed crime was extremely serious.
At the floor, a first-time offender faces a guideline range of zero to six months, which makes probation realistic. At level 19, a first-time offender faces 30 to 37 months.6United States Sentencing Commission. 2025 Guidelines Manual – Sentencing Table A defendant with significant criminal history at the same level could see 63 to 78 months on paper, though the three-year statutory cap controls.
Collateral Consequences
Because misprision is a felony, a conviction brings consequences beyond the sentence. A convicted felon cannot possess firearms or ammunition under federal law.7Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts Most states restrict voting rights for people with felony convictions during incarceration, and many continue those restrictions through probation or parole.8United States Department of Justice. Federal Statutes Imposing Collateral Consequences Upon Conviction
Professional licensing is another concern. Federal law bars people convicted of offenses involving dishonesty from working in banking and financial services, and misprision frequently involves concealing financial crimes.8United States Department of Justice. Federal Statutes Imposing Collateral Consequences Upon Conviction State boards governing law, medicine, and education routinely ask about felony convictions. For non-citizens, a felony conviction can trigger deportation proceedings or bar future immigration benefits.
How It Differs From Related Federal Charges
Misprision sits at the lighter end of a spectrum of post-crime offenses, which is why it matters to understand what the heavier charges look like.
Accessory after the fact under 18 U.S.C. § 3 applies when someone actively helps an offender avoid arrest, trial, or punishment. The penalty runs up to half the maximum for the underlying crime, or up to 15 years if that crime carries life or death.9Office of the Law Revision Counsel. 18 USC 3 – Accessory After the Fact The difference comes down to whether the defendant helped the person or helped hide the crime.
Obstruction of justice under 18 U.S.C. §§ 1503, 1512, and 1519 covers witness tampering, evidence destruction, and interference with judicial proceedings. Penalties range from 10 to 20 years depending on the statute and can reach life or death if the obstruction involves killing or attempting to kill a witness.10Congressional Research Service. Obstruction of Justice: An Overview of Some of the Federal Statutes
False statements under 18 U.S.C. § 1001 criminalizes lying to a federal agent and carries up to five years.11Office of the Law Revision Counsel. 18 US Code 1001 – Statements or Entries Generally Someone who lies to the FBI about a crime they witnessed can face both a misprision charge and a § 1001 charge for the same lie.
Why Misprision Shows Up So Often in Plea Deals
In federal practice, misprision is one of the most common plea-down charges. Prosecutors who could prove accessory or obstruction will sometimes offer a misprision plea because the three-year maximum and the compressed guideline range make it attractive to defendants facing much heavier exposure. The charge lets both sides resolve a case where the defendant’s involvement was real but secondary.
That matters for anyone researching the offense. A misprision conviction often reflects a negotiated outcome rather than a case the government built from scratch under § 4. Defense attorneys regularly evaluate whether misprision is a viable landing spot when a client had knowledge of a co-conspirator’s crime and took some step to hide it but was not deeply involved in the underlying offense.
Statute of Limitations
Federal prosecutors have five years to bring a misprision charge, under the general rule in 18 U.S.C. § 3282 for non-capital federal offenses.12Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital Misprision does not fall within any of the extended limitation periods that apply to offenses like terrorism or financial institution fraud.13United States Department of Justice. Criminal Resource Manual 650 – Length of Limitations Period
One wrinkle: misprision can be a continuing offense. If you learn about a felony and spend the next two years actively hiding evidence, the clock may not start until the last act of concealment. The five-year window runs from when the misprision offense is complete, not from when the underlying felony occurred.
Defenses and Privileges
The Fifth Amendment
Passive silence is not misprision because the statute itself requires an affirmative act of concealment, not because the Constitution excuses silence. The Fifth Amendment becomes relevant in a different way: when reporting the felony would force the person to incriminate themselves. Under Hoffman v. United States, a person can invoke the privilege against self-incrimination when there is a “real and appreciable” danger that disclosure would provide a link in a chain of evidence against them.14Constitution Annotated (Congress.gov). The Fifth Amendment – Privilege Against Self-Incrimination Someone who participated in the felony, or in a related crime, has a legitimate reason not to walk into an FBI office and confess their own conduct along with someone else’s.
Attorney-Client and Spousal Privileges
Attorneys who learn about a client’s past crimes through privileged communications are protected by attorney-client privilege and generally have no duty to report. The privilege covers past conduct. It does not extend to helping a client plan or carry out a future crime, which is where the crime-fraud exception comes in.
Spousal privilege can also matter. Federal courts recognize two forms: the testimonial privilege, which prevents compelling a married person to testify against their spouse, and the confidential communications privilege, which protects private conversations between spouses during the marriage. Either could complicate a misprision prosecution where the defendant’s only knowledge came through a spouse’s private disclosure. These defenses are fact-specific.
How to Report a Federal Felony
For someone who knows about a federal felony and wants to report it rather than risk exposure, the process is straightforward. The FBI handles the broadest range of federal offenses, the DEA handles drug offenses, and the ATF investigates firearms violations, arsons, and bombings.15Federal Bureau of Investigation. How Does the FBI Differ From the Drug Enforcement Administration (DEA) and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)? When in doubt, the FBI is almost always the right starting point.
Most agencies run 24-hour tip lines and online portals that accept digital evidence. Visiting a local field office to speak with a duty agent is another option. Useful details to gather before reporting include the nature of the crime, names or descriptions of the people involved, when and where it happened, and any evidence you can access. Reporter identity is generally kept confidential during the early stages of an investigation.
The statute requires reporting “as soon as possible.” There is no bright-line deadline, but delay creates risk, particularly if anything you do in the meantime could be characterized as concealment. Anyone unsure whether reporting could expose them to criminal liability should talk to a defense attorney before making a disclosure. That consultation is itself privileged and cannot be used against you.