A perjurer is a person who, while under a valid oath or signing a document under penalty of perjury, willfully makes a false statement about something material to the matter at hand. Under federal law, that conduct is a felony punishable by up to five years in prison and fines reaching $250,000.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally2Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine Honest mistakes, faulty memory, and offhand lies in everyday conversation don’t fit the term. The label is reserved for someone who knowingly deceives a court, grand jury, or government agency about something that could actually influence the outcome.
What the Law Requires
Three elements have to line up before someone is legally a perjurer. Remove any one and the conduct, however distasteful, isn’t perjury.
A Valid Oath or Penalty-of-Perjury Statement
The oath is the gateway. A statement only becomes perjury if the speaker was first sworn in by someone authorized to administer oaths — a judge, court clerk, or notary — or signed a document carrying a penalty-of-perjury declaration.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally3U.S. Department of State Foreign Affairs Manual. 7 FAM 850 Taking an Affidavit That formal threshold puts the person on notice that false statements now carry criminal consequences.
Willful Intent to Deceive
The statute uses the word “willfully.” The speaker has to know the statement is false when they make it and say it anyway.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally A witness who misremembers a date or mixes up two events isn’t a perjurer, because the government would have to prove they knew the right answer and gave a different one on purpose. Confusion and bad memory aren’t crimes. Deliberate deception is.
Materiality
The lie also has to matter. A statement is material when it has a natural tendency to influence the decision being made.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Getting your phone number wrong on the stand probably isn’t material. Lying about whether you were at the scene of a crime almost certainly is. This requirement keeps every minor inaccuracy from being charged as a felony.
The Two Federal Perjury Statutes
Federal prosecutors have two main tools, and the choice between them changes the rules of the case.
General Perjury Under 18 U.S.C. § 1621
This is the broader provision. It reaches false statements made under oath in any federal proceeding where an oath is authorized, as well as false statements on documents signed under penalty of perjury.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally A person can become a perjurer under § 1621 without ever walking into a courtroom, simply by signing a false federal form.
Section 1621 also carries an old common-law feature called the two-witness rule. The government generally cannot convict on this statute based on one person’s word alone against the defendant’s. It needs a second witness or independent corroborating evidence to prove the statement was false.
False Declarations Under 18 U.S.C. § 1623
This statute is narrower in scope — it applies only to proceedings before a federal court or grand jury — but friendlier to the prosecution.4Office of the Law Revision Counsel. 18 USC 1623 – False Declarations Before Grand Jury or Court The two-witness rule does not apply. Prosecutors can also win a conviction by showing that the person gave two irreconcilably contradictory statements under oath, without having to prove which one was the lie.
Section 1623 includes a recantation defense that § 1621 lacks. If the person admits the false statement during the same continuous proceeding, and the lie hasn’t yet substantially affected the proceeding or been exposed, that admission bars prosecution.4Office of the Law Revision Counsel. 18 USC 1623 – False Declarations Before Grand Jury or Court Timing is everything. Once the damage is done or the falsehood is about to come out anyway, taking it back no longer helps.
When a False Impression Isn’t Perjury
Perjury is harder to prove than people assume, partly because of a Supreme Court decision that drew a sharp line around what counts. In Bronston v. United States, the Court held that a literally true but misleading answer does not violate the federal perjury statute, even if the witness intended to create a false impression.5Justia. Bronston v. United States, 409 US 352 (1973) If the questioner asks something vague and gets a technically accurate but evasive response, the fix is a better follow-up question, not a perjury charge.
The practical effect is that the phrasing of questions carries as much weight as the answers. A careful witness can navigate around dangerous topics without technically lying, and the statute won’t reach that behavior. The Court’s reasoning was that cross-examination already exists to deal with evasive witnesses, and stretching perjury law to cover misleading-but-true statements would cause more problems than it solved.
The element-by-element requirements are themselves defenses. Showing the statement wasn’t material, wasn’t willful, or wasn’t made under a proper oath defeats the charge. Under § 1623, timely recantation within the same proceeding adds a statutory escape hatch.
Criminal Penalties
Both § 1621 and § 1623 make perjury a felony punishable by up to five years in federal prison.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Individual fines can reach $250,000 under the general federal fine statute.2Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine State penalties vary but most classify perjury as a felony with maximum sentences between three and five years. The federal statute of limitations gives prosecutors five years from the date of the false statement to bring charges.6Office of the Law Revision Counsel. 18 USC 3282 – Offenses Not Capital
Convincing Someone Else to Lie
You don’t have to tell the lie yourself to be charged with a perjury offense. Under 18 U.S.C. § 1622, anyone who persuades or induces another person to commit perjury is guilty of subornation of perjury and faces the same five-year maximum.7Office of the Law Revision Counsel. 18 USC 1622 – Subornation of Perjury The catch is that the perjury must actually have happened. Coaching a witness to lie when the witness ends up telling the truth doesn’t fit the statute, though obstruction of justice or witness tampering might still apply.
Consequences Beyond Prison
A perjury conviction follows a person well past any sentence. It’s a felony, and felony convictions reach into professional licensing, immigration status, and civil rights. Licensed professionals — lawyers, doctors, accountants, real estate agents — face disciplinary proceedings that can end in suspension or revocation. For attorneys, perjury is the kind of offense that routinely leads to disbarment.
For noncitizens, a perjury conviction is widely treated as a crime involving moral turpitude under immigration law, which can trigger deportation proceedings or bar future admission to the United States.
Where Perjury Actually Happens
Most people picture a witness box, but the bigger exposure sits in paperwork. The federal statute reaches any document signed under penalty of perjury, including tax returns, bankruptcy petitions, immigration applications, loan documents submitted to federally regulated institutions, and sworn affidavits filed with government agencies.1Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Depositions count too, because the witness is placed under oath before questioning begins. If there’s an oath or a penalty-of-perjury clause on the page, the statute applies the same way it would in open court.