Federal Perjury Defense

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

Perjury is the crime of lying under oath. It sounds simple, but federal perjury law is more demanding than most people expect — and more defensible. The government must prove not only that a statement was false, but that it was material, made under a valid oath, and uttered with a deliberate intent to lie rather than as a product of confusion or memory. If you are facing a perjury accusation, a perjury lawyer should examine each of those requirements closely.

At Elizabeth Franklin-Best, P.C., perjury and false-declaration cases are home territory: ours is a federal criminal defense and appellate practice, and these prosecutions usually come down to what a transcript actually says. Elizabeth Franklin-Best — recognized by Best Lawyers in America as the 2026 “Best Lawyer” in Appellate Practice — handles federal matters exclusively. Perjury is a precise, intent-driven offense, and we defend it by holding the government to every element.

This guide explains what federal perjury is, the statutes that define it, what prosecutors must prove, the penalties involved, and how a defense is built. It is general legal information, not legal advice. If you have testified, are scheduled to testify, or have been charged, our paid, one-hour initial consultation is where the work begins. This guide sits within our white-collar crime defense practice.

Quick Answer

Question	Answer
What is perjury?	Willfully making a false statement about a material matter while under a lawful oath, in testimony, a declaration, or another sworn statement.
What laws define it?	18 U.S.C. § 1621, the general perjury statute, and 18 U.S.C. § 1623, which covers false declarations before a court or grand jury.
What must the government prove?	A statement under a valid oath, falsity, materiality, and a willful intent to lie — proven beyond a reasonable doubt.
What penalties can apply?	Up to 5 years in prison and fines under either statute.
What does an initial consultation cost?	It is a paid, one-hour consultation — time we use to read the testimony at issue and assess your options.

Key Takeaways

• Perjury requires a statement under a lawful oath — it does not reach unsworn statements, which fall under other laws.
• The false statement must be material — capable of influencing the proceeding — not merely false.
• Perjury demands willful intent. Testimony given from confusion, mistake, or faulty memory is not perjury.
• Under the literal truth doctrine, an answer that is technically true is not perjury, even if it is evasive or misleading.
• Section 1623 makes grand jury and court perjury easier to prove than Section 1621 and removes the old two-witness rule.
• Section 1623 also offers a recantation defense — correcting false testimony in the same proceeding, under defined conditions, can bar prosecution.

What Is Perjury?

Perjury is the act of willfully giving false testimony about a material matter while under a lawful oath. It can occur in trial testimony, in a grand jury appearance, in a deposition, in an affidavit, or in any document signed under penalty of perjury. The oath is what sets perjury apart from other false-statement crimes. A lie told to a federal agent in an informal interview is not perjury — it is a false statement under a different statute. Perjury is reserved for falsehoods made after a person has formally sworn to tell the truth.

Because the oath is central, perjury law is also narrower and more technical than people assume. The government cannot win simply by showing that sworn testimony turned out to be wrong. It must prove that the statement was false when made, that it mattered, and that the witness lied on purpose. Each of those requirements is a real obstacle, and each is a place where a perjury defense applies pressure.

The Federal Perjury Statutes

Federal perjury is prosecuted under two statutes:

• 18 U.S.C. § 1621 — the general perjury statute. It applies wherever an oath is authorized by federal law, including depositions, affidavits, and written declarations made under penalty of perjury.
• 18 U.S.C. § 1623 — false declarations before or ancillary to a court or grand jury. Congress enacted it to make perjury in those settings easier to prosecute than under § 1621.

The differences are practical. Section 1623 eliminates the historic “two-witness rule,” and it allows the government to prove falsity by showing that a witness made two irreconcilably contradictory sworn statements — without having to prove which one was the lie. Section 1623 also provides a recantation defense that § 1621 does not. Because grand jury and trial testimony can be charged under either statute, knowing which one the government has chosen, and why, shapes the defense.

What the Government Must Prove

To convict of perjury, the government must prove the following beyond a reasonable doubt:

• A statement under oath. The defendant testified or declared under a lawful oath, before a competent tribunal, officer, or person authorized to administer it.
• Falsity. The statement was false when it was made.
• Materiality. The statement had a natural tendency to influence, or was capable of influencing, the proceeding in which it was made. Materiality is a jury question — the Supreme Court confirmed in Johnson v. United States, 520 U.S. 461 (1997), that in a § 1623 case it is the jury, not the judge, that must decide it.
• Willful intent. The defendant did not believe the statement was true and made it deliberately — not because of confusion, mistake, or faulty memory.

Willfulness is the element that defeats many perjury charges. Sworn testimony is given in stressful, fast-moving settings, often about events long past. A witness who is mistaken, who misremembers, who misunderstands a question, or who answers imprecisely has not committed perjury. The crime requires a conscious decision to lie about something the witness knew to be untrue.

Applied insight. The gap between “wrong” and “lying” is where perjury cases are won. Testimony can be inaccurate for a dozen innocent reasons — memory, stress, an ambiguous question, an assumption about what was being asked. A perjury defense keeps the jury’s attention on that gap, because the statute punishes only the deliberate lie, not the honest error.

The Literal Truth Defense

One of the most important protections in perjury law is the literal truth doctrine. In Bronston v. United States, 409 U.S. 352 (1973), the Supreme Court held that a witness cannot be convicted of perjury for an answer that is literally true, even if the answer is unresponsive and even if it was intended to mislead. If a question is imprecise and the witness gives a technically accurate response, the remedy is for the questioner to ask a sharper follow-up question — not for the government to prosecute.

Bronston itself shows how strict the rule is. Asked at a bankruptcy hearing whether he had Swiss bank accounts, the witness answered that his company had once had one in Zurich — an answer that was literally true, plainly unresponsive, and calculated to deflect the question about his own accounts. The Supreme Court reversed his perjury conviction anyway, holding that the burden is on the questioner to pin the witness down. Under § 1621, an answer’s misleading implication is not a crime; only a statement the witness did not believe to be true is.

That doctrine places real responsibility on the examiner. Perjury cases often founder on the precise wording of the question and the answer. A question that was vague, compound, or based on a false premise may not support a perjury charge at all, because the witness’s answer can be read as true under a reasonable interpretation. Reconstructing exactly what was asked, and exactly what was said, is therefore central to a perjury defense.

Grand Jury Testimony and the Perjury Trap

Most federal perjury charges are born in the grand jury room. A witness appears under subpoena, without counsel at the table — a lawyer may wait outside, and the witness may leave to consult — and answers questions from a prosecutor who already knows what the documents show. Testimony in depositions and ancillary court proceedings generates charges the same way. We explain how grand jury practice fits into the larger investigation in our guide to the federal criminal process.

Defense lawyers sometimes speak of a “perjury trap” — an appearance arranged less to gather facts than to generate a prosecutable lie. Courts rarely dismiss indictments on that theory, so the protection has to come earlier, from preparation: knowing the documents, insisting on precise questions, asking that questions be repeated or clarified, refusing to guess, and invoking the Fifth Amendment where answering truthfully would be incriminating. A witness who says “I don’t know” when that is true, or who declines to speculate, has not committed perjury. The witnesses who get charged are usually the ones who walked in unprepared and tried to talk their way through.

Penalties and Recantation

Perjury under either § 1621 or § 1623 is a felony punishable by up to five years in prison and a fine. Procuring someone else to commit perjury — subornation of perjury — carries the same exposure. A perjury conviction also has consequences beyond the sentence: it is a crime of dishonesty that can be used to attack a person’s credibility in any future proceeding, and it carries serious professional and reputational harm.

Section 1623 contains an important safety valve. Its recantation provision allows a witness who gave false testimony to correct it — to admit the falsehood in the same continuous proceeding — and thereby bar a perjury prosecution, provided the recantation comes before the false testimony has substantially affected the proceeding and before it has become manifest that the falsity will be exposed. The timing requirements are strict, and § 1621 has no equivalent provision, so the availability of recantation is a question for counsel to assess quickly. Our federal sentencing practice addresses how a perjury finding can also affect sentencing in a related case.

Applied insight. If a witness realizes that sworn testimony was false, the window to fix it can be narrow. Recantation under § 1623 is time-sensitive and condition-bound, and the wrong move — or no move — can forfeit it. That is a decision to make with counsel immediately, not after the proceeding has moved on.

Defending a Perjury Case

A perjury defense is built on the statute’s exacting elements. The most common ground is the absence of willful intent: that the testimony reflected an honest mistake, a misunderstanding, stress, or a genuine failure of memory rather than a decision to lie. The literal truth doctrine is another powerful tool — if the answer was accurate under a fair reading of an imprecise question, it is not perjury. A defense may also show that the statement was not material, that it was not given under a valid oath or before a competent tribunal, or that the government simply cannot prove the statement was false.

The choice of statute matters as well. Under § 1621, the historic two-witness rule limits how the government may prove falsity, and where the case rests on contradictory statements, the government may be unable to show which statement was the false one. Where § 1623 applies, the recantation defense may be available. We examine the transcript word by word, test each element, and identify every protection the law provides. A verdict can never be guaranteed in either direction, and we will not tell you otherwise; what we commit to is the transcript-level rigor these cases demand — every question, every answer, every condition the statute imposes.

Perjury at Sentencing and Alongside Other Charges

Perjury exposure does not end with the five-year statutory maximum. A perjury count is scored under U.S.S.G. § 2J1.3, and the guideline range climbs when the false testimony caused substantial interference with the administration of justice or related to a criminal offense. The fact pattern also travels: false testimony about a fraud can draw a perjury count on top of the fraud counts, alongside false statements and obstruction of justice charges built on the same conduct.

Sworn testimony can also raise a defendant’s sentence in a case where perjury was never charged. In United States v. Dunnigan, 507 U.S. 87 (1993), the Supreme Court held that a defendant who testifies falsely at trial may receive an obstruction-of-justice enhancement under U.S.S.G. § 3C1.1, so long as the sentencing court makes independent findings of willfully false, material testimony — and that enhancing a sentence this way does not violate the right to testify. Dunnigan is one reason the decision whether a defendant takes the stand is among the most consequential calls in any federal trial: testimony that the jury rejects can cost additional months at sentencing even without a new charge.

Subornation of perjury under 18 U.S.C. § 1622 — persuading or procuring another person to testify falsely — carries the same five-year exposure and frequently appears in witness-tampering investigations. Where the government believes coordination occurred, a conspiracy theory may follow as well.

Why Work With Elizabeth Franklin-Best, P.C.

Perjury allegations put a person’s words under a microscope, and the defense has to be at least as exacting. Elizabeth Franklin-Best brings an appellate lawyer’s discipline to that task: she is a member of the bars of the United States Supreme Court and all twelve federal circuit courts of appeals, handles district-court matters nationwide through pro hac vice admission, and wrote Reversing Your Criminal Conviction. Chambers USA includes her in its 2026 rankings for Litigation: White-Collar Crime & Government Investigations.

The experience behind that work is substantial. Across her career, Ms. Franklin-Best has appeared in more than 330 federal proceedings — over 190 at the district-court level and more than 120 in the federal courts of appeals, with additional matters at the certiorari stage — and over 100 federal appeals in all twelve circuits. Sworn-testimony disputes recur throughout that record, because the question whether a witness lied, misremembered, or simply answered an imprecise question is exactly the kind of issue that reviewing courts revisit. We cannot promise a particular result in any perjury case, but we can bring that depth of trial and appellate judgment to the transcript at the center of yours.

Perjury cases are decided on the close reading of a transcript — the exact question, the exact answer, the exact oath. That is precisely the kind of careful, appellate-grade work our practice is built around. Our first task in every perjury engagement is the record itself — the full transcript, the exhibits, and the context the charged excerpt leaves out — because a quoted answer rarely reads the same once the entire colloquy is on the table. This guide is part of our broader white-collar crime defense practice.

Talk With a Perjury Lawyer

If you are scheduled to testify, have been accused of false testimony, or are worried about something already said under oath, the choices ahead are time-sensitive — recantation windows close, and testimony hardens into a record. Bring us the transcript, the subpoena, or the indictment, and we will tell you candidly where you stand. The first step is a paid, one-hour initial consultation devoted to your testimony and the defenses it realistically supports.

Frequently Asked Questions