A declaration letter is a written statement of facts you sign under penalty of perjury, used in place of live testimony or a notarized affidavit. Under federal law, an unsworn declaration carries the same legal weight as a sworn, notarized affidavit, which is why it has become one of the most common documents filed in courts and government agencies.1Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury Writing one means stating only facts you personally know, numbering the paragraphs, and closing with the exact perjury language the statute requires. Get those pieces right and you have a document a judge can rely on. Get them wrong and it may be struck.
Declaration or Affidavit?
People use the two words interchangeably, but the legal difference is simple. An affidavit requires you to sign in front of a notary public. A declaration does not. You add a line stating that everything is true under penalty of perjury, sign it, and the document has legal effect. No notary appointment, no fee, no waiting.
Under 28 U.S.C. § 1746, an unsworn declaration signed under penalty of perjury has “like force and effect” as a notarized affidavit in any federal proceeding.1Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury Most states have adopted similar rules for their own courts, though specifics vary. If you’re filing in state court, confirm your local rules accept a declaration before you skip the notary.
What a Declaration Letter Must Contain
Every piece below has a job. Leave one out and the court or agency may reject the filing.
- Case information, if the declaration is part of a pending matter: court name, case number, and the parties’ names at the top so the clerk can match it to the right file.
- Your identifying information: full legal name, address, and contact details.
- A statement that you have personal knowledge of what follows and are competent to testify to it.
- Numbered paragraphs of facts, in chronological order, limited to what you yourself saw, heard, or did.
- The perjury clause in the exact statutory form.
- Your signature and the date you signed.
The personal-knowledge requirement is the one that trips people up. Hearsay, speculation, and guesses about what someone else was thinking will get the declaration struck. Federal Rule of Civil Procedure 56 spells this out for summary-judgment declarations: they must be made on personal knowledge, set out facts that would be admissible in evidence, and show the declarant is competent to testify.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment Courts apply the same principle broadly. If you didn’t see it, hear it, or experience it yourself, leave it out.
The Perjury Clause: Exact Language
The perjury clause is what gives the declaration its legal force. Without it, the document is an unsigned letter with no consequences for dishonesty. Federal law provides two forms, and which one you use depends on where you sign.1Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury
If you sign inside the United States, its territories, or its commonwealths, use:
“I declare under penalty of perjury that the foregoing is true and correct. Executed on [date]. [Signature]”
If you sign from outside the United States, the clause must reference U.S. law specifically:
“I declare 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 distinction matters. Using the domestic form while signing abroad can technically invalidate the declaration, so if you’re overseas, keep the “under the laws of the United States of America” language.
How to Write a Declaration Letter
Start with a heading that identifies the document. For a court case, match the court’s caption format, include the case number, and title it “Declaration of [Your Name].” For an administrative purpose outside a court case, a plain heading with your name and the reason for the declaration is enough.
Open with a short introductory paragraph: your full name, your age or date of birth, your city and state, and why you’re writing. Something like: “My name is [Name]. I am over 18 years of age and reside in [City, State]. I have personal knowledge of the facts stated below.” That paragraph establishes you as a competent declarant with firsthand knowledge.
Number every paragraph after the introduction. Judges and attorneys reference declarations by paragraph number, and unnumbered declarations are harder to use and easier to ignore. Each numbered paragraph should carry one fact, or one closely related group of facts. Don’t cram multiple events into a single block.
Keep the language factual and plain. Write “I saw John leave the building at approximately 3:15 p.m. on March 12, 2026” rather than “John was always sneaking around.” Specific dates, times, locations, and names are what give a declaration evidentiary value. Emotional language, opinions, and conclusions about someone else’s state of mind undercut your credibility.
End with the appropriate perjury clause, your signature, and the date. Before you sign, read the entire document again and check every date, name, and factual claim. One verifiable error casts doubt on everything else. After signing, keep copies for yourself and submit the original to the court or agency.
When Declaration Letters Are Used
Declarations appear almost anywhere someone needs to put facts on the record without taking the witness stand. Family law is one of the most common settings: custody filings describing a child’s routine or a parent’s behavior, divorce filings covering financial disclosures and background facts.
Immigration cases rely on them heavily. USCIS accepts written statements and affidavits as part of the record when deciding benefit requests, and officers may consider a wide range of documentary evidence without the strict evidentiary rules that apply in court.3USCIS. Chapter 6 – Evidence Declarations from applicants, family members, and friends are standard support in visa petitions and asylum cases.
Federal civil litigation uses declarations in motion practice, especially summary judgment.2Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment Small claims courts and administrative hearings accept them as a streamlined way to present facts without requiring everyone to show up in person.
When a Declaration Will Not Work
The federal declaration statute has limits. Under 28 U.S.C. § 1746, an unsworn declaration cannot substitute for a deposition, an oath of office, or an oath that must be taken before a specific official other than a notary public.1Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury For those, you need the formal sworn procedure with a notary or other authorized official.
Some state courts and agencies set their own rules about when a notarized affidavit is mandatory. Certain real estate transactions, for example, still require notarization regardless of the federal rule. Check the filing requirements for the specific court or agency before assuming a declaration will suffice.
Redact Sensitive Information Before Filing
If your declaration mentions Social Security numbers, birth dates, financial account numbers, or the names of minors, redact that information before filing in federal court. Under Rule 5.2 of the Federal Rules of Civil Procedure, filings may include only the last four digits of a Social Security or taxpayer identification number, the year of a person’s birth, the initials of a minor child, and the last four digits of a financial account number.4Legal Information Institute. Federal Rules of Civil Procedure Rule 5.2 – Privacy Protection for Filings Made With the Court
Many state courts have adopted similar rules. Court filings are public records, and a full Social Security or bank account number in a declaration creates a permanent identity-theft exposure. When in doubt, redact. If the judge needs the full information, you can usually ask to file an unredacted version under seal.
Penalties for a False Declaration
Signing a declaration you know is false is federal perjury. Under 18 U.S.C. § 1621, anyone who willfully writes something they don’t believe to be true in a declaration under penalty of perjury faces a fine, up to five years in prison, or both.5Office of the Law Revision Counsel. 18 U.S. Code 1621 – Perjury Generally The statute refers specifically to declarations made under 28 U.S.C. § 1746, so there is no doubt that unsworn declarations fall within it.
The criminal exposure is not the only risk. A false statement caught by opposing counsel becomes a weapon used to argue nothing else in your declaration should be believed. Courts can impose sanctions, strike the declaration, or enter adverse rulings. The practical consequences often arrive faster and hit harder than a separate perjury prosecution. Treat every sentence in a declaration as testimony you would be willing to repeat on the witness stand, because legally, that is exactly what it is.