What Is a Sworn Declaration? Format, Uses, and Perjury Risk

A sworn declaration is a written statement of facts that the signer affirms is true under penalty of perjury. Under 28 U.S.C. § 1746, a properly worded declaration carries the same legal weight as a notarized affidavit, so you can file one in most federal proceedings without ever seeing a notary.¹ Lying in one is federal perjury, punishable by up to five years in prison and fines up to $250,000.

How a Declaration Differs From an Affidavit

Courts treat the two as equivalent evidence. The difference is procedural. An affidavit has to be signed in front of a notary public, who administers an oath and stamps the page. A declaration skips that step: you write it, date it, add the penalty-of-perjury clause, sign it, and file it. No appointment, no notary fee.

Section 1746 is what makes this work. It allows an unsworn written declaration to stand in for any sworn statement required under federal law, provided you use the correct language and signature format.¹ Many state courts accept declarations in place of affidavits as well, but the rules vary and some states still require a notarized affidavit for certain filings. Check the local rule before you rely on a declaration in state court.

The Penalty-of-Perjury Language You Have to Use

The closing language is what gives a declaration its legal force. Section 1746 sets out two forms, and which one you use depends on where you sign.

If you sign inside the United States, its territories, or commonwealths:

“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 sign outside the United States, add a reference to U.S. law:

“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).”¹

The statute says the document needs to follow this form “substantially,” so minor wording variations likely won’t sink it. There is no reason to improvise. Copy the language exactly.

What Else the Declaration Needs

The statute itself requires only that the declaration be written, dated, signed, and contain the penalty-of-perjury clause.¹ Standard practice fills in the rest:

Your full name, address, and relationship to the matter.
A statement of how you have personal knowledge of what you’re describing. Declarations based on hearsay or speculation routinely get rejected.
The specific facts you’re attesting to, organized clearly and limited to what you personally observed or experienced.
The required penalty-of-perjury clause.
The date and your signature.

The personal-knowledge piece is where declarations most often fail. Federal Rule of Civil Procedure 56 requires that a declaration used on summary judgment be made on personal knowledge, state facts that would be admissible in evidence, and show the declarant is competent to testify on the matter.² A declaration full of opinions or secondhand accounts won’t survive a challenge.

When a Declaration Won’t Substitute for a Sworn Statement

Section 1746 carves out three situations where you still need a traditional oath or affidavit: depositions, oaths of office, and any oath that a statute specifically requires be taken before a designated official other than a notary.¹ For anything else in federal practice, the declaration works.

Where Sworn Declarations Are Used

Federal Court Motions

The most common use is supporting or opposing a motion for summary judgment. Rule 56 explicitly allows parties to cite “affidavits or declarations” to show whether a factual dispute exists.² Declarations also back up temporary restraining orders, preliminary injunctions, and other motions where a party needs to put facts in the record without calling a live witness.

Immigration Filings

When applicants cannot produce primary documents like birth or marriage certificates, USCIS allows them to submit affidavits or sworn statements from people with direct personal knowledge of the events.³ Asylum applicants routinely file declarations describing persecution; the Form I-589 instructions require that all statements in the application be declared true and correct under penalty of perjury.⁴

USCIS expects these declarations to include the declarant’s full name, address, date and place of birth, relationship to the applicant, and an explanation of how they have personal knowledge of the facts.³ Vague or unverifiable statements carry no weight.

Administrative and Business Uses

Declarations also show up in insurance claims (insurers often require a sworn proof-of-loss statement), tax disputes, real estate transactions, and corporate filings. Any time an organization needs a reliable written statement of facts without scheduling live testimony, a declaration is the standard tool.

What Happens If You Lie

The federal perjury statute, 18 U.S.C. § 1621, covers anyone who knowingly makes a false material statement under oath or in a declaration under penalty of perjury. A conviction carries up to five years in prison.⁵ The fine is set by 18 U.S.C. § 3571, which caps the maximum at $250,000 for an individual convicted of a federal felony.⁶

A separate statute, 18 U.S.C. § 1623, targets false declarations made specifically in court or grand jury proceedings. It explicitly covers declarations made under penalty of perjury as permitted by 28 U.S.C. § 1746 and carries the same five-year maximum.⁷

State perjury laws apply when the declaration goes into a state proceeding. Every state treats perjury as a felony, with prison exposure and fines that vary by jurisdiction.

Criminal prosecution is not the only risk. Under Rule 56, if a court finds a declaration was submitted in bad faith or solely to cause delay, it can order the filer to pay the other side’s reasonable expenses, including attorney’s fees, and can hold the party or attorney in contempt.² Those sanctions can apply even when the conduct falls short of criminal perjury.

Fixing an Error After You File

If you realize a declaration you filed contained a false statement, 18 U.S.C. § 1623 offers a narrow path to avoid prosecution. Admitting the falsity in the same proceeding can block a perjury charge, but only if the false statement has not yet substantially affected the proceeding and it has not already become obvious that the lie would be exposed.⁷ Recanting after the other side catches you does not qualify.

For honest factual mistakes, the usual approach is a supplemental or amended declaration filed with the same court, referencing the original and explaining the correction. Courts generally have broad discretion to allow amendments, but local rules vary, and the longer you wait, the harder it is to persuade a court the error was innocent. Consult an attorney before filing a correction in an active case.

1
Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury
2
Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment
3
USCIS. USCIS Policy Manual Volume 7 Part A Chapter 4 – Documentation
4
USCIS. Instructions for Application for Asylum and for Withholding of Removal
5
Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally
6
Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine
7
Office of the Law Revision Counsel. 18 USC 1623 – False Declarations Before Grand Jury or Court