Perjuring yourself in court is a felony. If you lie under oath, a judge can stop the proceeding on the spot, hold you in contempt, strike your testimony, or declare a mistrial, and a prosecutor can later charge you with perjury carrying up to five years in federal prison and a fine.1Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally A conviction also follows you for life, costing professional licenses, firearm rights, voting rights, and, for non-citizens, your immigration status.
What the Judge Can Do Right Away
When a judge suspects a witness is lying during testimony, the response can be immediate. The judge may stop the proceedings and warn the witness directly, reminding them of their obligation to tell the truth and giving them a chance to correct what they said. Most judges try this first because it keeps the case on track.
If the lie is obvious, the judge can strike the testimony from the record and instruct the jury to disregard it. In theory, jurors then pretend they never heard it. In practice, unringing a bell is difficult, and experienced trial lawyers know that a struck statement can still leave an impression.
A judge can also hold the witness in contempt of court, which is a separate matter from perjury. Criminal contempt under federal law carries up to six months in jail for summary proceedings, and the judge imposes it directly, without a separate trial.2United States Department of Justice Archives. Criminal Resource Manual 728 – Criminal Contempt That makes contempt one of the fastest penalties in the legal system.
If the perjury is discovered mid-trial, the judge can go further and declare a mistrial, forcing the entire case to start over. Witness misconduct, including perjury, is a recognized ground for mistrial.3Cornell Law School. Mistrial
What It Does to Your Case
Even if no one ever files criminal charges, lying under oath can destroy the case you were trying to help. Once a witness is caught in a lie, their credibility is gone. Judges and jurors don’t limit their skepticism to the one false statement; they tend to distrust everything else that witness said. Trial attorneys call this the “false in one, false in all” principle, and it can cause an entire side’s case to unravel if that witness was carrying key testimony.
If the perjury only surfaces after a verdict, the disadvantaged party can appeal, arguing they were denied a fair trial. An appellate court that agrees can overturn the verdict and order a new trial. The person who lied hasn’t just risked their own freedom; they may have sabotaged the outcome for the side they were supporting.
False statements in court filings bring their own penalties in civil cases. Federal Rule of Civil Procedure 11 lets a judge order the lying party to pay the opposing side’s attorney’s fees, pay monetary penalties into the court, or issue a retraction, all on top of any criminal exposure.4LII / Legal Information Institute. Rule 11 – Signing Pleadings, Motions, and Other Papers; Representations to the Court; Sanctions
What Your Own Lawyer Must Do
If your attorney learns you’ve lied on the stand, they face an ethical conflict that will affect your case. The ABA Model Rules of Professional Conduct require attorneys to take “reasonable remedial measures” when they know a client or witness has offered materially false evidence to a tribunal. Your lawyer will first urge you to correct the record yourself. If you refuse, the attorney may be required to disclose the problem to the court, even though doing so means revealing information you shared in confidence. State rules vary on exactly how far this obligation extends, but in most jurisdictions, the duty of candor to the court overrides attorney-client privilege when it comes to active fraud on the tribunal.
The Criminal Charge: What Prosecutors Must Prove
Not every wrong answer under oath is perjury. To convict you, prosecutors have to prove three things: you were under a valid oath, you made a false statement on purpose, and the statement was material to the proceeding.
The oath requirement is straightforward. Before testifying, every witness swears or affirms they will tell the truth.5Cornell Law School. Rule 603 – Oath or Affirmation to Testify Truthfully No magic words are needed. Written statements count too. If you sign an affidavit or a tax return under penalty of perjury, you’re held to the same standard as if you raised your hand in a courtroom.1Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally
Intent is what separates perjury from a bad memory. You must have knowingly said something you believed to be false. A witness who says the car was blue when it was actually green hasn’t committed perjury if they genuinely remembered it wrong. If they saw a green car and deliberately said blue, that’s the willful falsehood prosecutors look for.6United States Department of Justice Archives. Criminal Resource Manual 1745 – Elements of Perjury
Materiality means the false statement had to be capable of influencing the outcome. Lying about your middle name in a contract dispute probably doesn’t meet this bar. Lying about when you signed the contract almost certainly does, because it directly affects the legal rights at stake.
Prosecutors also face the federal two-witness rule: one person’s testimony isn’t enough on its own to prove the lie. There must be a second witness or independent corroborating evidence.7U.S. Courts. 24.14 Perjury – Testimony (18 U.S.C. 1621) Model Jury Instructions Because of these hurdles, perjury prosecutions tend to be reserved for lies that were blatant and well-documented. That isn’t a reason to shade the truth; it means the cases that do get charged usually leave the defendant very little room to maneuver.
Prison Time, Fines, and How Long You Can Be Charged
Under 18 U.S.C. § 1621, perjury carries a maximum sentence of five years in federal prison and a fine.1Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally A separate statute, 18 U.S.C. § 1623, covers false declarations before a court or grand jury and carries the same five-year maximum for most proceedings. For cases involving the Foreign Intelligence Surveillance Court, that ceiling jumps to ten years.8Office of the Law Revision Counsel. 18 U.S. Code 1623 – False Declarations Before Grand Jury or Court State penalties vary but generally treat perjury as a felony with fines that commonly range from $5,000 to $25,000.
The federal statute of limitations is five years from the date of the offense, the general federal limitations period for non-capital crimes.9Office of the Law Revision Counsel. 18 U.S. Code 3282 – Offenses Not Capital You can be charged years after the trial where you lied, long after you thought the matter was behind you.
Can You Take It Back? The Recantation Window
Federal law offers a narrow escape hatch. Under 18 U.S.C. § 1623, if you admit your statement was false during the same continuous proceeding in which you made it, that admission can block prosecution entirely. Two conditions apply: at the time you come clean, the false statement must not have already substantially affected the proceeding, and it must not yet be obvious that your lie has been or will be exposed.8Office of the Law Revision Counsel. 18 U.S. Code 1623 – False Declarations Before Grand Jury or Court
Timing matters more than anything. There’s no fixed deadline measured in days. The question is whether the proceeding has moved past the point where your lie can be undone. If the opposing side has already built arguments around your false testimony, or if a prosecutor has independently uncovered the truth, recanting won’t save you. The defense rewards people who correct themselves before the damage is done, not those who confess only after getting caught.
This defense applies only to charges under § 1623. The older general perjury statute, § 1621, does not include a recantation provision, so whether this defense is available depends on which statute the prosecutor chooses to charge under.
What a Conviction Costs You Afterward
A perjury conviction is a felony, and a felony record creates problems that outlast any prison sentence.
- Many licensing boards for professions like law, medicine, accounting, and real estate treat a perjury conviction as grounds for suspension or revocation. Outside licensed professions, a felony record disqualifies you from many jobs, especially in government or positions requiring security clearances.
- Federal law prohibits convicted felons from possessing firearms, and a perjury conviction triggers that ban.
- Most states restrict or eliminate voting rights for people with felony convictions, at least during incarceration and often during parole. Felons are also generally disqualified from serving on juries.
- For non-citizens, a perjury conviction is classified as a crime involving moral turpitude under U.S. immigration law, which can make a person deportable or inadmissible for future entry.10Foreign Affairs Manual (FAM). Crimes Involving Moral Turpitude – INA 212(a)(2)(A)(i)(I)
The five years of prison exposure get the headlines, but for many people the professional and civil consequences end up being far more damaging over a lifetime.
Getting Someone Else to Lie Is Its Own Crime
You don’t have to be the one on the witness stand to be charged. Convincing, coaching, or pressuring someone else to lie under oath is a separate federal crime called subornation of perjury. Under 18 U.S.C. § 1622, anyone who procures another person to commit perjury faces the same maximum penalty: up to five years in prison and a fine.11Office of the Law Revision Counsel. 18 U.S. Code 1622 – Subornation of Perjury If a party in a lawsuit tells a friend to testify that they were together on a certain night when they weren’t, both the friend who lies and the party who arranged it can be charged with separate felonies, even after the underlying case has concluded.