What Is a Statement Under Penalty of Perjury?

A statement under penalty of perjury is a written declaration in which you affirm that everything in a document is true, signed using language that federal law treats as the equivalent of a sworn oath. It lets you sign official filings without a notary, and it carries the same legal weight as swearing in court.¹ The tradeoff is real: deliberately lying in one is a federal felony punishable by up to five years in prison.²

The Exact Language to Use

Federal law prescribes specific wording, and getting it wrong can invalidate the document. If you’re signing inside the United States, the declaration should read: “I declare (or certify, verify, or state) under penalty of perjury that the foregoing is true and correct. Executed on (date). (Signature).”¹

If you’re signing outside the country, the wording changes slightly: “I declare (or certify, verify, or state) under penalty of perjury under the laws of the United States of America that the foregoing is true and correct. Executed on (date). (Signature).” The added phrase matters. Without it, a declaration signed abroad may not satisfy the statute.³

The statute uses the phrase “substantially the following form,” which leaves some room for minor variations, but sticking to the exact wording is the safer choice. Include the date, note where you signed, and apply your signature by hand or using a legally valid electronic signature. That signature binds you personally to every statement in the document.

Where You’ll Be Asked to Sign One

Penalty-of-perjury declarations show up in more places than most people expect. In civil litigation, written answers to interrogatories (the opposing party’s written questions) must be signed under oath or its equivalent.⁴ Family court relies heavily on these sworn statements for custody and support decisions that turn on accurate disclosures about income, assets, and living arrangements.

Every federal tax return carries the same commitment. The Internal Revenue Code requires that any return filed under the tax laws contain or be verified by a written declaration made under penalties of perjury.⁵ A return filed without the declaration is treated as a nullity, as if it was never filed.⁶

Immigration forms use the same mechanism with much higher stakes attached. Federal law makes it a separate crime to submit a false statement on an immigration application under penalty of perjury, with prison terms reaching 10 years for a first offense and up to 25 years when the fraud is connected to terrorism.⁷ Social Security claimant statements use their own version, warning on the form itself that a false statement about a material fact is a crime.⁸

When a Notary Is Still Required

The whole purpose of the declaration is to skip the notary. Three situations are carved out in the statute where it won’t work:¹

Depositions, where testimony still requires a sworn oath administered by an authorized officer.
Oaths of office for government positions, which require a formal oath rather than a written declaration.
Any statute requiring you to swear before a specified official other than a notary public.

Outside those three situations, a properly worded declaration works anywhere federal law would otherwise require a notarized affidavit.

What Actually Counts as Perjury

Perjury is narrower than ordinary lying. A prosecutor has to prove three things. First, you made a false statement while under a legal duty to be truthful, such as after taking an oath or signing a document under penalty of perjury. Second, the falsehood was willful: you knew it was untrue and said it anyway. An honest mistake, a bad memory, or genuine confusion doesn’t qualify.²

Third, the false statement has to be “material,” meaning it was capable of influencing the decision or proceeding it was submitted for. A wrong middle initial on a tax form probably isn’t material. A fabricated income figure almost certainly is. Federal jury instructions define materiality as whether the statement “had a natural tendency to influence, or was capable of influencing” the action of the body receiving it.²

Criminal Penalties if You Lie

General federal perjury carries a maximum of five years in prison, a fine, or both.² Specialized statutes impose steeper penalties in specific areas:

Willfully signing a false tax return under penalty of perjury is a separate felony carrying up to three years in prison and fines of up to $100,000, or $500,000 for corporations.⁹
A false statement on an immigration application carries up to 10 years for a first or second offense, 15 years for a third, and 25 years if connected to international terrorism.⁷

Civil Fallout Inside a Lawsuit

Criminal prosecution isn’t the only risk. When a false statement surfaces during litigation, the judge has broad power to punish the offending party within the case itself. Available sanctions include striking the false filing from the record, ordering the party to pay the other side’s attorney’s fees, or dismissing the person’s entire claim or defense.¹⁰

The credibility damage is often worse than any formal sanction. Once a judge or jury concludes you lied in a sworn declaration, everything else you’ve submitted comes under suspicion. Opposing counsel will press that point for the rest of the case, and judges remember. A single lie under penalty of perjury can unravel an otherwise strong position.

Can You Take It Back

Federal law offers a narrow escape hatch for someone who made a false declaration in a court or grand jury proceeding and wants to come clean. Under the separate statute covering false declarations in court, you can avoid prosecution by admitting your statement was false, but only if two conditions are met: the false statement hasn’t yet substantially affected the proceeding, and it hasn’t yet become obvious that your lie has been or will be exposed.¹¹

The recantation defense is more limited than it sounds. The admission must happen during the same continuous proceeding as the original false statement. A vague offer to “clarify” or “supplement” earlier testimony doesn’t count. You have to unambiguously admit the prior statement was false. And if you already know your lie has been discovered or is about to be, recantation is off the table.¹²

One caveat worth knowing: this defense applies only to the false-declarations statute covering court and grand jury proceedings. The general perjury statute has no equivalent, so recantation is not a guaranteed defense in every perjury prosecution.¹² For a declaration signed on a tax return, an immigration form, or a civil filing outside of court testimony, the honest fix is to correct the record through the proper channel (an amended return, a corrected filing) and accept whatever consequences follow, rather than relying on a defense that may not apply.

1
Office of the Law Revision Counsel. 28 USC 1746 Unsworn Declarations Under Penalty of Perjury
2
Office of the Law Revision Counsel. 18 USC 1621 Perjury Generally
3
Office of the Law Revision Counsel. 28 USC 1746 Unsworn Declarations Under Penalty of Perjury
4
Cornell Law School. Federal Rules of Civil Procedure Rule 33 Interrogatories to Parties
5
Office of the Law Revision Counsel. 26 USC 6065 Verification of Returns
6
Internal Revenue Service. Significant Service Center Advice – Altered Jurats
7
Office of the Law Revision Counsel. 18 USC 1546 Fraud and Misuse of Visas, Permits, and Other Documents
8
Social Security Administration. Statement of Claimant or Other Person Form SSA-795
9
Office of the Law Revision Counsel. 26 USC 7206 Fraud and False Statements
10
Cornell Law School. Federal Rules of Civil Procedure Rule 11
11
Office of the Law Revision Counsel. 18 USC 1623 False Declarations Before Grand Jury or Court
12
Department of Justice Archives. Criminal Resource Manual 1751 Comparison of Perjury Statutes 18 USC 1621 and 1623