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What Is an Affidavit? How to Write and Sign One

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An affidavit is a written statement of facts that you swear or affirm is true, usually in front of a notary. It can be used in court cases, to prove identity or residency, and in many official processes.

Where affidavits are used

  • Court cases, to support a motion or provide testimony in writing.
  • Proving residency, identity, name change or relationship.
  • Property and estate matters, such as transferring a small estate.
  • Lost or stolen documents, such as a title or stock certificate.

What it must include

  1. The name and details of the person making the statement, called the affiant.
  2. Numbered paragraphs stating facts that come from personal knowledge.
  3. A statement that the contents are true under penalty of perjury or under oath.
  4. The affiant's signature, signed in front of a notary or other authorized official.
  5. The notary's certificate, stamp and date.

Important cautions

A false statement in an affidavit can be a crime, so stick to facts you know and can support. Do not guess or offer opinions as facts. If a court or agency requires a particular form, use that form.

Affidavit vs. declaration

Many courts accept a declaration signed under penalty of perjury without a notary. Check what the receiving court or agency accepts before you sign.

Frequently asked questions

Do I need a lawyer to write an affidavit?

Not always, but a lawyer helps when the affidavit will be used in a court case.

Does an affidavit have to be notarized?

Usually yes, unless the recipient accepts an unsworn declaration.

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