What is affidavit? Definition, common uses, and how to sign one properly

 An affidavit is a written statement of fact that the signer, called the affiant, swears or affirms to be true in front of a notary public or another official authorized to administer oaths. Once notarized, it carries the same legal weight as sworn testimony given out loud in court, which is why courts, government agencies, and financial institutions accept it in place of live testimony.

TL;DR

• An affidavit is a sworn, written statement signed by the affiant and typically notarized.
• Notarization (a jurat) is what turns a written statement into a legally binding affidavit; without it, the document is usually just a declaration.
• Common uses include court cases, real estate closings, estate and probate matters, immigration filings, and financial disclosures.
• Knowingly including false information in an affidavit can constitute perjury, a criminal offense in every US state.
• The affiant’s own signature can typically be applied electronically under the ESIGN Act and state UETA laws, though the notarization step still follows state-specific rules.
• Remote online notarization (RON) is tracked by the Mortgage Bankers Association in 45 states and Washington, D.C., for real estate transactions as of 2026; a handful of states have not yet enacted RON laws, and California’s law does not fully take effect until 2030.

In this blog, we’ll delve deeper into the concept of an affidavit and show you how you can easily sign an affidavit with SignNow’s eSignature solution.

What is an affidavit?

An affidavit is a legal document in which a person states, under oath, that the facts it contains are true to the best of their knowledge. The person making the statement is the affiant; the document becomes legally operative once the affiant signs it in front of a notary or another authorized official, who then certifies the oath with a jurat.

Think of it as written testimony sworn to outside a courtroom. When a witness testifies in person, they raise their right hand and promise to tell the truth. An affiant does the same thing on paper (or screen), with a notary stepping in for the judge to administer the oath. This is the framing used by legal reference sources such as the Cornell Law School legal encyclopedia, which describes an affidavit as a sworn statement made outside of court that asserts facts are true to the affiant’s knowledge.

Affidavits appear across a wide range of legal and administrative settings:

• Divorce and custody cases,
• Bankruptcy filings,
• Estate administration,
• Immigration applications,
• Routine business transactions.

Because the statement is made under oath, courts and agencies can rely on it without requiring the affiant to appear in person.

What is a signed affidavit, and who is the affiant?

A signed affidavit is the finished, legally operative version of the document— a sworn affidavit with the affiant’s facts, signature, and the notary’s jurat all present together. A drafted-but-unsigned affidavit is just a document; nothing in it carries legal weight until the affiant signs it under oath in front of the notary.

Who is the affiant?

The affiant is the person making the sworn statement — whether that’s a witness, a party to a legal matter, or someone confirming a fact such as residency or marital status. To sign an affidavit validly, the affiant must meet the following requirements:

• Sound mind: The affiant must be mentally competent at the time of signing.
• Voluntary action: The affiant must act of their own free will, without coercion or undue pressure.
• Understanding of perjury: The affiant must understand that they are making the statement under penalty of perjury.
• Competency: While there is no minimum age requirement, the affiant must be capable of understanding what they are attesting to.

Some jurisdictions distinguish an affidavit from an unsworn declaration, which is signed under penalty of perjury but does not require notarization. Federal courts and several state courts accept declarations for certain filings, but the notarized affidavit remains the default in most formal legal and administrative contexts, which is why “what is a signed affidavit” and “what is an unsigned draft” have meaningfully different answers.

What is an affidavit used for? Common uses

Affidavits are used whenever a formal, verifiable statement of fact is required, acting as a substitute for live testimony in a wide range of settings. Below are the most common situations where they come into play.

Legal proceedings

Attorneys use affidavits to present a client’s version of events, introduce evidence before a hearing, or support a motion, often coordinating signatures across several parties through SignNow’s legal services workflows. Because the statement is sworn, a court can treat it as sworn evidence even though the affiant is not present to testify live.

Real estate transactions

Sellers and title companies use affidavits, such as an affidavit of title, to confirm ownership and disclose that a property is free of undisclosed liens before closing. Buyers, lenders, and real estate teams closing deals remotely rely on this sworn record to reduce risk in the transaction.

Financial and lending matters

Financial affidavits document a person’s income, assets, and liabilities in divorce cases, bankruptcy filings, and some loan applications, giving a court or lender a sworn account of someone’s financial position; financial services teams use the same signed-and-notarized workflow for these disclosures.

Government and immigration

Applicants often submit affidavits of support or affidavits of identity to confirm details in immigration filings or benefits applications, where a signed, notarized statement stands in for documentation that may not otherwise exist. Government agencies handling these filings typically require two-factor signer authentication on top of notarization.

Estate and probate

An affidavit of heirship or affidavit of domicile helps establish who inherits property when there is no will, or confirms a decedent’s legal residence for probate purposes; executors often pull these from a document template library rather than drafting from scratch.

Wills and estates

Executors and witnesses can submit sworn statements confirming a will’s validity or providing key details about the deceased’s estate. Witnesses may provide affidavits of execution confirming the will was properly signed and witnessed, while executors typically submit sworn oaths or inventory statements about estate assets. These affidavits support the probate process, ensuring a transparent and lawful distribution of assets, and strengthening the legal standing of wills and estates for a smooth resolution of inheritance and succession matters.

Name changes

In name changes, affidavits serve as formal declarations to support an individual’s decision to adopt a new name. Applicants submit sworn statements providing details and reasons for the name change, creating an official legal record. These documents support the name change process by ensuring transparency and authenticity. However, an affidavit alone is typically not enough to legally enact a name change. In most jurisdictions, a court order, deed poll, or civil registry action is also required to officially recognize the new name.

A concrete example: a course coordinator processing international student enrollments needs signed, verifiable paperwork from every applicant, often across borders and time zones. As Lucija Hrvat, Course Coordinator at Istituto Italiano di Fotografia, put it: “We can recommend SignNow not only because of compliance, but also because it is easy in use for us and for all the applicants.” That combination, a compliant signing process the signer doesn’t have to fight with, matters just as much when the document being signed is an affidavit rather than an enrollment form.

Affidavit vs. affirmation vs. declaration vs. deposition vs. statement

The most common confusion is treating any signed legal document as an “affidavit.” The table below separates the five terms by what actually makes each one legally binding.

Document type	What is it?	Requires notarization?	Requires an oath?	Typical use
Affidavit	A written, out-of-court statement of facts made voluntarily and verified by taking an oath or affirmation before an authorized legal official, such as a notary public (Cornell University)	Yes (jurat)	Yes, sworn or affirmed before a notary	Court filings, real estate closings, estate matters
Affirmation	A solemn, legally binding declaration that a statement or testimony is true, serving as the legal equivalent of a religious oath for individuals who conscientiously object to swearing on a sacred text or deity (Cornell University)	Yes (jurat, non-religious wording)	Yes, without religious language	Same uses as an affidavit, for signers who decline a religious oath
Declaration	An unsworn written statement of facts signed under penalty of perjury, often serving as a legally valid alternative to a notarized affidavit where allowed by law (FinLaw)	No	No notary oath; signed under penalty of perjury instead	Routine administrative or business filings, some federal court submissions
Deposition	An out-of-court oral or written testimony given under oath by a witness during the pre-trial discovery process, recorded verbatim by a court reporter for potential use in court (LawFirm.com)	No (recorded/transcribed instead)	Yes, oral testimony under oath	Pre-trial witness questioning, usually with attorneys present
Statement	An oral, written, or nonverbal assertion of facts provided by a person regarding a legal matter or investigation, which may or may not be made under oath (Cornell University)	No	No	Informal written account with no independent legal weight unless separately sworn

The practical distinction that matters most for signers: an affidavit and an affirmation both require a notary’s jurat, a declaration does not, and a plain statement carries no evidentiary weight unless it is formally sworn or made under penalty of perjury.

What makes an affidavit legally valid? Three core requirements explained

An affidavit becomes legally valid when three conditions are met together: the affiant signs voluntarily, the affiant signs the document personally, and a notary (or equivalent authorized official) witnesses the signature and administers the oath.

1. Voluntary execution. A court can reduce the weight of, or reject outright, an affidavit signed under coercion or duress. The affiant’s statement has to reflect their own account, not one dictated to them.
2. The affiant’s own signature. The signature is the affiant’s personal commitment to the truth of the document. Without it, there is no sworn statement, only a draft.
3. Notarization. The notary confirms the affiant’s identity and witnesses the signature and oath, then applies a seal or stamp. This step, not the content of the statement itself, is what gives the document its legal standing, and it’s the reason a platform’s security and compliance certifications matter as much as its signing interface.

Signing an affidavit containing information the affiant knows to be false can constitute perjury, criminal charges in every US state, with penalties ranging from fines to imprisonment, depending on the jurisdiction and the severity of the false statement, according to the Cornell Law School legal encyclopedia. The consequences aren’t limited to criminal exposure: a false affidavit can also get a related motion dismissed or a case sanctioned.

The affiant’s signature: jurat vs. acknowledgment

An affidavit specifically requires a jurat, not an acknowledgment, and the difference between the two notarial acts is, according to the National Notary Association, the single most common point of confusion signers run into.

A jurat is the notarial act used for sworn statements: the notary confirms the affiant’s identity, watches the affiant sign the document in front of them, and administers an oath or affirmation that the contents are true. The affiant must sign in the notary’s physical or virtual presence; signing beforehand invalidates the jurat.

An acknowledgment, by contrast, only certifies that the signer appeared before the notary and confirmed the signature is theirs, and the document may be signed before the notary session rather than during it. There is no oath involved, which is why deeds, contracts, and other documents that don’t require a sworn statement typically use an acknowledgment instead.

The signature block on a properly prepared affidavit reflects this: a line for the affiant’s signature and printed name, a line for the date, and a separate notary certificate section with space for the notary’s signature, seal, commission expiration date, and the jurat language confirming the affiant appeared, was identified, and swore to the statement.

How to sign an affidavit properly using SignNow

Signing an affidavit correctly means getting the sequence right: the statement must be finalized before signing, and the affiant must sign in the notary’s presence, not before. SignNow offers a perfect solution for this.

SignNow empowers businesses and individuals to expedite document processing and eSignatures efficiently. With a range of features, it empowers the creation and signing of electronic documents, payment collection, and the establishment of automated workflows. SignNow contributes to smooth and professional contract negotiation and management.

Here is how that sequence works using signNow’s document workflow.

1. Access SignNow. Log in to your existing SignNow account or sign up for a free 7-day trial to test drive SignNow’s functionality.

2. Upload the affidavit document. Upload a template from SignNow’s affidavit template library to your SignNow account and add the finished affidavit text to the document if the affiant is starting from a blank affidavit form rather than an attorney-drafted one. The affiant can also start this step from SignNow’s mobile apps if the document needs to move quickly.

3. Add the affiant’s signature field. Make changes to the uploaded document using the SignNow editor. Click Prepare and Send to start editing your document. In the document editor, drag a Signature field onto the document and assign it to the affiant. Do not let the affiant complete this field before the notarization step; a signature applied in advance defeats the purpose of the jurat.

4. Set signer authentication. Require identity verification, such as a password or SMS code, on the signer invitation so the notary and any downstream reader can confirm the person signing is who they claim to be.

5. Request notarization. Once the affiant is ready to sign, use the document’s 24/7 online notarization option to connect the affiant with a commissioned notary over live video, so the signature and oath happen together in the notary’s presence, exactly as a jurat requires. Read our article on how to notarize documents online using SignNow to learn more about this feature.

6. Review the completed document history. After the notary completes the session, open the document’s audit trail to confirm the timestamped record of every action: when the affiant opened the document, authenticated, signed, and when the notary certified it.

This walkthrough uses SignNow’s actual document and notarization workflow rather than a generic description. SignNow’s Business Premium ($15 per month), Enterprise ($30 per month), and Site License ($1.50 per signature invite) plans include both 24/7 online notarization and court-admissible audit trails, so the sequence above doesn’t require an add-on to complete.

Can you sign an affidavit electronically?

Yes, in most cases: the affiant’s own signature on an affidavit can be applied electronically under the federal ESIGN Act and state UETA laws, which give electronic signatures the same legal standing as handwritten ones when the signer intends to sign and consents to do business electronically. What changes state by state is not whether the affiant can sign electronically, but how the notary’s own act, the jurat, has to be performed.

Most states now permit remote online notarization (RON), where the affiant signs in front of a commissioned notary over a live audiovisual connection rather than in the same room. As of 2026, the Mortgage Bankers Association tracks RON-enabling laws in 45 states and Washington, D.C.; a handful of states, including Alabama, Georgia, Mississippi, and South Carolina, have not yet enacted their own RON authorization, and California remains a special case, with its permanent RON statute not taking effect until January 1, 2030.

Because the requirements attach to the notarization rather than the underlying document type, an affidavit that would otherwise require an in-person notary visit can, in a RON state, be completed entirely online: the affiant signs electronically, the notary verifies identity and witnesses the oath over live video, and the session itself becomes part of the audit trail attached to the document.

Common mistakes to avoid when signing an affidavit

Most problems with affidavits trace back to a handful of avoidable errors.

• Signing before notarization. The affiant must sign in the notary’s presence. A pre-signed document forces the notary to refuse the jurat.
• Including opinions or hearsay as fact. An affidavit should contain only what the affiant personally knows to be true, stated in the first person and, where useful, organized into numbered paragraphs.
• Using the wrong notarial act. Asking for an acknowledgment when the document needs a jurat (or the reverse) can make the document unusable for its intended purpose.
• Assuming every jurisdiction accepts remote online notarization. Confirm with the receiving court, agency, or institution before relying on RON, especially for documents that will be filed outside the state where the notarization occurred.
• Skipping identity verification on the signer invitation. Adding two-factor signer authentication gives the completed document a stronger evidentiary record if the affidavit is later challenged.

Final thoughts

Understanding affidavits—their purpose, features, and types—is mandatory for anyone dealing with legal documents.  Whether verifying a statement, confirming identity, or upholding a business agreement, affidavits are a pillar of legal integrity. With the introduction of electronic signatures, the once-cumbersome process of legally attesting to the truth has been streamlined and fast-tracked.

Ready to simplify your document workflows? SignNow makes it easy to sign PDFs and legal documents electronically — securely, quickly, and with full confidence. Join thousands of professionals who have already made the switch to smarter, faster document signing. Try SignNow for free today and experience the difference for yourself. 

Key terms

• Affiant: the person who makes and signs a sworn statement in an affidavit.
• Jurat: the notarial act certifying that the affiant appeared, was identified, signed in the notary’s presence, and swore or affirmed that the contents are true; required for affidavits.
• Acknowledgment — the notarial act certifying only that the signer appeared and confirmed their signature, with no oath involved; used for deeds and contracts, not affidavits.
• Notary public — an official authorized by the state to witness signatures, administer oaths, and certify documents such as affidavits.
• Perjury — the criminal offense of knowingly making a false statement under oath, including in a signed affidavit.
• Remote online notarization (RON): a notarization performed over live audiovisual connection instead of in person; the Mortgage Bankers Association tracks RON-enabling laws in 45 states and Washington, D.C. for real estate transactions as of 2026, with adoption continuing to expand.

FAQs

Sources

• Cornell Law School, Legal Information Institute, “affidavit”
• National Notary Association, jurat vs. acknowledgment guidance
• NotaryCam, what states allow remote notary, 2026 guide (citing Mortgage Bankers Association RON data)
• Electronic Signatures in Global and National Commerce Act (ESIGN Act)
• Uniform Electronic Transactions Act (UETA)
• Cornell Law School, Legal Information Institute, “perjury”