What is perjury?

Understanding Perjury: Definition, Laws, and Consequences

Perjury is the criminal act of deliberately making a false statement while under oath or affirmation in a judicial or official proceeding. It is a serious offense that strikes at the heart of the legal system because courts, government agencies, and other institutions depend on truthful testimony to function properly. In the United States, perjury is a felony under federal law (18 U.S.C. § 1621) and is also prosecuted under the criminal statutes of every state.

Key Aspect	Details
Definition	Knowingly making a false material statement under oath
Classification	Felony (federal and most state jurisdictions)
Federal statute	18 U.S.C. § 1621
Maximum federal penalty	Up to 5 years in prison and fines
Burden of proof	Beyond a reasonable doubt
Common settings	Court testimony, depositions, sworn affidavits, government forms

The word "perjury" comes from the Latin perjurium, meaning a false oath. While most people associate perjury with lying on the witness stand during a trial, the offense covers a much broader range of situations. Any false statement made under oath or penalty of perjury, including those on written documents, tax returns, immigration forms, and sworn declarations, can qualify.

Understanding perjury is essential for anyone who may be called to testify, sign legal documents, or interact with the justice system. This article explains the elements of perjury, how it differs from related offenses, the penalties involved, possible defenses, and notable historical cases.

Elements of Perjury

To secure a perjury conviction, the prosecution must prove several specific elements beyond a reasonable doubt. Simply making an incorrect statement under oath is not enough. The false statement must be deliberate, material to the proceeding, and made while the person is legally sworn to tell the truth.

Element	What the Prosecution Must Prove
Oath or affirmation	The statement was made under a legally administered oath
Falsity	The statement was objectively false
Intent (willfulness)	The person knew the statement was false when making it
Materiality	The false statement was relevant to the proceeding or matter at hand

Oath or affirmation

The statement must have been made while the person was under a legally valid oath or affirmation. This includes testimony in court, statements during depositions, declarations on government forms signed "under penalty of perjury," and affidavits. If the oath was not properly administered, a perjury charge may fail.

Falsity

The statement itself must be demonstrably false. Opinions, beliefs held in good faith, and statements that are technically accurate (even if misleading) generally do not constitute perjury. The prosecution must show that what the person stated as fact was objectively untrue.

Intent and willfulness

Perjury requires specific intent, meaning the person must have known that their statement was false at the time they made it. Honest mistakes, faulty memory, confusion, or misunderstandings do not meet this threshold. The prosecution must demonstrate that the individual deliberately chose to lie.

Materiality

The false statement must be material, meaning it had the potential to influence the outcome of the proceeding or the decision being made. A trivial or irrelevant false statement, even if made intentionally under oath, typically does not rise to the level of perjury. Courts generally apply an objective standard: could the statement have affected the proceeding, regardless of whether it actually did?

Federal Perjury Law

Under federal law, perjury is primarily governed by three statutes, each addressing different aspects of false sworn statements. These laws give federal prosecutors broad authority to charge individuals who lie under oath in federal proceedings or on federal documents.

Federal Statute	Scope	Maximum Penalty
18 U.S.C. § 1621 (Perjury generally)	False statements under oath in federal proceedings	Up to 5 years in prison
18 U.S.C. § 1622 (Subornation of perjury)	Inducing or procuring another person to commit perjury	Up to 5 years in prison
18 U.S.C. § 1623 (False declarations before a grand jury or court)	False material declarations in federal court or grand jury proceedings	Up to 5 years in prison

18 U.S.C. § 1621: Perjury generally

This is the primary federal perjury statute. It applies to any person who, having taken an oath before a competent tribunal, officer, or person, willfully states or subscribes to any material matter that they do not believe to be true. It covers both oral testimony and written statements signed under penalty of perjury.

Convictions under this statute carry a maximum prison sentence of 5 years, along with potential fines. The actual sentence depends on the severity of the false statement, the context, and federal sentencing guidelines.

18 U.S.C. § 1622: Subornation of perjury

Subornation of perjury occurs when a person persuades, induces, or procures another individual to commit perjury. The person who suborns perjury does not need to testify themselves. Instead, they face prosecution for orchestrating the false testimony of someone else.

For a conviction, the prosecution must prove that perjury was actually committed and that the defendant knowingly and intentionally caused it. The penalties mirror those for perjury itself: up to 5 years in federal prison.

18 U.S.C. § 1623: False declarations

This statute specifically addresses false material declarations made in federal court proceedings or before a federal grand jury. It differs from § 1621 in two important ways. First, it uses an objective materiality standard rather than requiring proof that the defendant subjectively believed the statement to be false. Second, it includes a "recantation defense," which allows a person to avoid conviction if they correct their false statement during the same proceeding before it substantially affects the case.

State Perjury Laws

Every U.S. state has its own perjury statutes, and while they share core principles with federal law, penalties and specific definitions vary considerably. Some states classify perjury into degrees, while others treat it as a single offense with sentencing discretion left to the judge.

State	Classification	Maximum Penalty
California (Penal Code § 118)	Felony	Up to 4 years in state prison
New York (Penal Law § 210)	Felony (first degree) / Misdemeanor (second degree)	Up to 7 years (first degree)
Texas (Penal Code § 37.02)	Felony (third degree)	2 to 10 years in prison
Florida (§ 837.02)	Felony (third degree)	Up to 5 years in prison
Illinois (720 ILCS 5/32-2)	Class 3 felony	2 to 5 years in prison

Degrees of perjury

Some states, such as New York, distinguish between first-degree and second-degree perjury. First-degree perjury typically involves false testimony in a judicial proceeding like a trial or grand jury hearing, while second-degree perjury covers false sworn statements in other official contexts, such as affidavits or government applications. First-degree perjury carries significantly harsher penalties.

Aggravated perjury

Certain states recognize aggravated perjury as a more serious offense. In Texas, for example, aggravated perjury (Penal Code § 37.03) applies when the false statement is made during an official proceeding and is material to the matter at hand. This is classified as a third-degree felony with penalties of 2 to 10 years in prison and fines of up to $10,000.

Where Perjury Can Occur

Perjury is not limited to courtroom testimony. The offense can be committed in a wide range of legal and official settings where individuals are required to provide truthful information under oath or affirmation.

Setting	Examples
Court proceedings	Criminal trials, civil trials, family court hearings
Depositions	Pretrial sworn testimony taken outside of court
Grand jury proceedings	Testimony before a grand jury considering indictments
Administrative hearings	Immigration hearings, licensing board proceedings
Sworn documents	Affidavits, declarations, tax returns, financial disclosures
Legislative proceedings	Congressional hearings, sworn testimony before committees

Courtroom testimony

The most well-known setting for perjury is the courtroom. When a witness takes the stand and is sworn in, every statement they make is subject to perjury laws. This applies in criminal cases, civil litigation, family law matters, and any other proceeding conducted before a judge.

Depositions and pretrial testimony

Depositions are sworn statements taken before trial, typically in a lawyer's office with a court reporter present. Even though a judge is not presiding, the testimony is given under oath and carries the same legal weight as courtroom testimony. Lying during a deposition is perjury.

Sworn written documents

Many legal and government documents require the signer to attest to the truthfulness of their statements under penalty of perjury. Examples include tax returns filed with the IRS, immigration applications, bankruptcy filings, insurance claims, and financial disclosure forms. Making false statements on these documents can result in perjury charges even without any oral testimony.

Congressional and legislative hearings

Witnesses who testify before Congress or state legislative committees under oath are also subject to perjury laws. Several high-profile perjury cases have involved false testimony given during congressional investigations.

Perjury vs. Related Offenses

Perjury is often confused with other crimes involving dishonesty or false statements. While these offenses share similarities, they differ in important ways regarding the circumstances, elements required for conviction, and applicable penalties.

Offense	Key Distinction from Perjury
Perjury	False statement made under oath in a proceeding or on a sworn document
False statements (18 U.S.C. § 1001)	Lying to a federal official or agency; no oath required
Contempt of court	Disobeying or disrespecting court authority; does not require a false statement
Obstruction of justice	Broader offense covering any act that impedes a legal proceeding
Fraud	Deception for financial gain; does not require an oath

Perjury vs. false statements

Under 18 U.S.C. § 1001, it is a federal crime to make a materially false statement to any federal agency or official, even without being under oath. This law covers false statements made to FBI agents, on government applications, or in reports submitted to federal departments. The maximum penalty is up to 5 years in prison, the same as perjury, but the oath requirement is absent.

Perjury vs. obstruction of justice

Obstruction of justice is a broader category of crimes that includes any intentional act designed to interfere with a legal proceeding. Perjury can be a form of obstruction, but obstruction also includes destroying evidence, witness tampering, and fleeing from law enforcement. A person can be charged with both perjury and obstruction of justice based on the same conduct.

Perjury vs. contempt of court

Contempt of court involves disobeying a court order, disrupting proceedings, or showing disrespect to the court. While both perjury and contempt can occur in a courtroom, contempt does not require a false statement. A witness who refuses to answer questions, for instance, may be held in contempt but has not committed perjury.

Penalties and Consequences

Perjury is treated as a serious criminal offense because it undermines the integrity of legal proceedings. Penalties vary by jurisdiction and the specific circumstances of the case, but they frequently include prison time, fines, probation, and lasting collateral consequences.

Penalty Type	Details
Federal prison	Up to 5 years
State prison	1 to 10 years (varies by state)
Fines	Up to $250,000 (federal); varies by state
Probation	Supervised release for a specified period
Criminal record	Felony conviction on permanent record
Professional consequences	Loss of professional licenses, disbarment for attorneys

Prison sentences

At the federal level, perjury carries a maximum sentence of 5 years in prison. State penalties vary widely. In Texas, aggravated perjury can result in up to 10 years in prison, while in New York, first-degree perjury (a Class D felony) carries a maximum of 7 years. First-time offenders may receive probation or a reduced sentence, but repeat offenders or those whose perjury caused severe harm to others face harsher outcomes.

Fines

Federal perjury convictions can result in fines of up to $250,000 for individuals. State fines vary but can reach $10,000 or more depending on the jurisdiction and severity of the offense.

Collateral consequences

Beyond direct criminal penalties, a perjury conviction carries severe collateral consequences. A felony conviction appears on a person's permanent criminal record, affecting employment opportunities, housing applications, and the right to vote or own firearms in many states. Attorneys convicted of perjury face disbarment. Medical professionals, accountants, and other licensed practitioners may lose their licenses. Public officials may be removed from office. Those seeking to clear their record may explore expungement, though eligibility varies by state and offense type.

Defenses Against Perjury Charges

Several legal defenses are available to individuals charged with perjury. Because the prosecution must prove every element of the offense beyond a reasonable doubt, a strong defense can challenge the intent, materiality, or accuracy of the alleged false statement.

Defense	How It Works
Lack of intent	The statement was an honest mistake, not a deliberate lie
Truthfulness	The statement was actually true, or literally true even if misleading
Immateriality	The false statement was not relevant to the proceeding
Recantation	The person corrected the false statement before it affected the proceeding
Ambiguous question	The question was vague, and the answer was truthful under one reasonable interpretation
Improper oath	The oath was not properly administered

Lack of intent

Perjury requires willful, deliberate dishonesty. If the defendant can show that their false statement resulted from a genuine lapse in memory, confusion, or a good-faith misunderstanding, they may defeat the intent element. This is one of the most common defenses because proving a person's state of mind is inherently difficult for prosecutors.

Literal truth doctrine

Under the literal truth doctrine, a statement that is technically accurate cannot constitute perjury, even if it is misleading or evasive. Courts have recognized that witnesses are not required to volunteer information. If a question is poorly worded, a literally truthful answer, no matter how misleading, does not meet the standard for perjury.

Recantation

Under federal law (18 U.S.C. § 1623), a person may avoid a perjury conviction by recanting, or correcting, their false statement within the same proceeding before the false testimony has substantially affected the case. Not all jurisdictions recognize a recantation defense, and the timing requirements are strict. The recantation must occur voluntarily and before the person is confronted with evidence of the falsehood.

Ambiguous questions

If the question posed to the witness was genuinely ambiguous, the defendant may argue that their answer was truthful under a reasonable interpretation of the question. Courts have held that it is the questioner's responsibility to ask clear and precise questions. The well-known example of President Bill Clinton's testimony, in which he parsed the meaning of the word "is," illustrates how linguistic ambiguity can play a central role in perjury disputes.

Two-witness rule

Historically, many jurisdictions required the testimony of at least two witnesses (or one witness plus corroborating evidence) to prove perjury. Known as the "two-witness rule," this higher evidentiary standard was designed to protect defendants from being convicted based on a single person's word against theirs. While this rule has been relaxed in some modern jurisdictions, it remains a viable defense in certain courts.

Notable Perjury Cases

Perjury has played a central role in numerous high-profile legal cases throughout history. These cases illustrate how perjury charges arise, the consequences they carry, and their impact on public trust in legal institutions.

Case	Year	Outcome
Alger Hiss	1950	Convicted; sentenced to 5 years in federal prison
Bill Clinton (impeachment)	1998	Impeached by House; acquitted by Senate
Martha Stewart	2004	Convicted of related charges; sentenced to 5 months
Scooter Libby	2007	Convicted; sentenced to 30 months (commuted by President Bush)
Barry Bonds	2011	Convicted of obstruction (perjury charges ended in mistrial)
Michael Cohen	2018	Pleaded guilty to false statements to Congress

Alger Hiss

One of the most famous perjury cases in American history involved Alger Hiss, a former State Department official. In 1950, Hiss was convicted of perjury for denying under oath that he had passed classified documents to a Soviet spy. His case became a landmark moment in Cold War politics and demonstrated how perjury charges can serve as a proxy for prosecuting conduct that is otherwise difficult to charge directly.

President Bill Clinton

In 1998, President Bill Clinton became only the second president in U.S. history to be impeached, partly on charges of perjury. The allegations stemmed from his sworn testimony in a civil deposition and before a grand jury, in which he denied having a sexual relationship with White House intern Monica Lewinsky. The House voted to impeach, but the Senate acquitted him.

Scooter Libby

I. Lewis "Scooter" Libby, former chief of staff to Vice President Dick Cheney, was convicted in 2007 of perjury, obstruction of justice, and making false statements in connection with the investigation into the leak of CIA operative Valerie Plame's identity. He was sentenced to 30 months in prison, though President George W. Bush later commuted the sentence. President Trump subsequently granted him a full pardon in 2018.

How Perjury Is Investigated and Prosecuted

Perjury investigations often begin when a judge, opposing attorney, or investigator identifies inconsistencies in a witness's testimony. Proving perjury is notoriously difficult, which is why relatively few cases are prosecuted compared to the frequency with which false statements occur in legal proceedings.

Step	Description
Identification	A false statement is identified through cross-examination, documentary evidence, or investigation
Referral	The matter is referred to prosecutors (often by a judge or grand jury)
Investigation	Prosecutors and investigators gather evidence of falsity and intent
Charging decision	Prosecutors decide whether the evidence supports perjury charges
Trial or plea	The case proceeds to trial or is resolved through a plea agreement

Why perjury is hard to prove

Several factors make perjury one of the most difficult crimes to prosecute successfully. The intent element is the primary challenge. Prosecutors must show not only that a statement was false but that the defendant knew it was false at the time. Defendants frequently argue faulty memory, confusion, or misunderstanding.

Additionally, the two-witness rule in some jurisdictions makes it harder to establish the falsity of a statement. Documentary or physical evidence contradicting the testimony strengthens the case, but such evidence is not always available. In some cases, investigators may use a lie detector test as part of their investigation, though polygraph results are generally inadmissible in court.

Prosecutorial discretion

Prosecutors exercise considerable discretion in deciding whether to pursue perjury charges. Many false statements go unprosecuted because the resources required for a perjury investigation and trial may outweigh the significance of the lie. Prosecutors tend to focus on cases where the false testimony had a substantial impact on the outcome of a proceeding or where bringing charges serves a strong public interest.

Perjury in Civil vs. Criminal Proceedings

Perjury can occur in both civil and criminal cases. The legal consequences for lying under oath do not depend on whether the underlying proceeding is civil or criminal. However, there are practical differences in how perjury is detected and pursued in each setting.

Factor	Civil Proceedings	Criminal Proceedings
Frequency of detection	Less commonly referred for prosecution	More likely to trigger investigation
Consequences for the case	Adverse inference, sanctions, case dismissal	Mistrial, overturned conviction, new charges
Criminal perjury charges	Possible but relatively rare	More likely to be pursued
Other penalties	Monetary sanctions, contempt of court	Sentencing enhancements, additional charges

In civil cases, judges may impose sanctions, draw adverse inferences against the lying party, or dismiss claims or defenses. However, referring perjury to criminal prosecutors is less common in civil matters. In criminal cases, perjury by a witness can lead to a mistrial, and perjury by a defendant adds significant sentencing exposure.

Perjury in International Law

Perjury is recognized as a criminal offense in virtually every legal system around the world. While the specific definitions and penalties vary by country, the core principle is universal: lying under oath in legal proceedings is a serious crime.

Country	Maximum Penalty
United States	Up to 5 years (federal)
United Kingdom	Up to 7 years
Canada	Up to 14 years
Australia	Up to 10 years (varies by state)
Germany	Up to 5 years

In the United Kingdom, perjury is governed by the Perjury Act 1911 and carries a maximum sentence of 7 years imprisonment. Canada treats perjury as an indictable offense under Section 132 of the Criminal Code, with a maximum penalty of 14 years, one of the harshest penalties for perjury in any common law jurisdiction.

International criminal tribunals, including the International Criminal Court (ICC), also have provisions for prosecuting witnesses who commit perjury during proceedings related to war crimes, crimes against humanity, and genocide.

How to Avoid Perjury

For anyone preparing to testify under oath, sign a sworn document, or provide information in an official proceeding, understanding how to avoid perjury is critical. The stakes are high, and even unintentional missteps can create the appearance of dishonesty.

Best Practice	Explanation
Tell the truth	Always provide honest, accurate information
Say "I don't know" when appropriate	Never guess or speculate under oath
Prepare thoroughly	Review relevant documents and refresh your memory before testifying
Listen carefully to questions	Answer only the question asked, and ask for clarification if needed
Consult an attorney	Get legal counsel before giving sworn testimony or signing sworn documents
Correct mistakes promptly	If you realize you gave incorrect testimony, notify the court immediately

Preparation is key

Before testifying, review any relevant documents, emails, records, or notes that pertain to the subject matter. Refreshing your memory reduces the risk of making inadvertently false statements. If you are a party to a lawsuit or a key witness, work closely with your attorney to understand the scope of questions you may face. Understanding how much a lawyer costs can help you plan for this type of legal representation.

When in doubt, say so

One of the simplest ways to avoid perjury is to acknowledge uncertainty. Phrases like "I don't recall," "I'm not sure,"