3.4 Signature Requirements

Key Takeaways

  • Acknowledgment signatures may be made before appearing; the signer simply acknowledges the signature is theirs
  • Jurat (affidavit) signatures must be made in the notary's presence
  • A signer who cannot write may sign by mark (an X), watched by the notary
  • The notary signs exactly as commissioned, in ink, next to the official stamp
  • Witnessing a signature is not the same as notarizing it
Last updated: June 2026

Timing Depends on the Act

The single most-tested signature concept in Ohio is when the signer must sign, and it turns entirely on whether the act is an acknowledgment or a jurat.

Notarial actWhen must the signer sign?What the signer does before the notary
AcknowledgmentBefore OR during appearanceDeclares the signature is theirs, made willingly
Jurat (sworn affidavit)In the notary's presenceSigns in front of you AND swears the contents are true

Acknowledgments

For an acknowledgment, the document may already be signed when the signer arrives. The signer's job is to acknowledge—to confirm that the signature is genuinely theirs and was made voluntarily. The notary is certifying who acknowledged, not watching the pen move.

Jurats

For a jurat, the signer must sign in front of you and take an oath or affirmation that the document's contents are true. If the affidavit arrives pre-signed, the signer must sign again in your presence. Watching the signature is mandatory—this is why a mailed-in affidavit can never be a valid jurat.

Handling Pre-Signed Documents

SituationAcknowledgmentJurat
Already signed before arrivalProceed; signer acknowledgesSigner must re-sign in your presence
Need a fresh signatureOptionalRequired

Name Matching

The signed name should be consistent with the document and with the ID. Reasonable shortenings are fine; an outright different identity is not.

Generally acceptableLikely a problem
John Smith signing as "J. Smith""John Smith" on ID, "Jane Smith" on document
Robert known as "Bob Jones"A name with no relationship to the ID
María García vs. "Maria Garcia" (accent)Completely unrelated surname

If the ID shows a fuller or different legal name than the document, note the variation and, where appropriate, have the signer sign the name as it appears in the document while you confirm identity from the ID.

Signature by Mark

A signer who cannot write—because of disability, illness, or illiteracy—may sign with a mark, usually an "X." The process:

  1. Verify the signer's identity exactly as for any signer.
  2. Have witnesses present if the document or institution requires them.
  3. Watch the signer make the mark.
  4. Write the signer's printed name beside the mark.
  5. Note in or near the certificate that the signature was made by mark.

The mark is the signer's signature; the notary does not sign for the signer, and a separate person never signs the signer's name in their place.

The Notary's Own Signature

On the commissionYou must sign as
Jane A. SmithJane A. Smith
María GarcíaMaría García
John Q. Public, Jr.John Q. Public, Jr.

Sign in ink (never pencil), exactly as commissioned, after the act is complete, adjacent to your official stamp. A printed or typed name is not a signature.

Witnessing Is Not Notarizing

RoleWhat you do
Notarial actIdentify the signer, perform the act, complete the certificate, apply the stamp
Personal witness onlyMerely observe the signing—no certificate, no stamp

When you act as a plain witness (for example, a will requiring two witnesses), you are not exercising your commission. Do not apply your notary stamp—doing so could imply a notarization that did not occur. Electronic signatures and seals used in online notarization are covered in Chapter 6.

Acknowledgment Versus Jurat: The Decisive Distinction

If you remember only one thing about signatures, make it this contrast, because the exam returns to it again and again. An acknowledgment answers the question "Did this person sign, and do they admit it freely?"—so a pre-existing signature is fine; the signer simply confirms it is theirs. A jurat answers a different question: "Did this person swear, before me, that the contents are true?"—so the signer must both sign in your presence and take an oath or affirmation. The acknowledgment is about authorship; the jurat is about truthfulness under oath.

A document that arrives already signed can be acknowledged immediately, but to receive a jurat that same document must be signed again while you watch.

Consider a power-of-attorney form using acknowledgment language: the principal already signed it at home, then appears and says, "Yes, that's my signature." You may proceed. Now consider an affidavit of residency using jurat language that arrives pre-signed: you must have the affiant sign a fresh signature in front of you and administer the oath before completing the certificate.

Reading the Certificate to Choose the Rule

The certificate wording tells you which rule applies. Acknowledgment certificates use phrases like "acknowledged before me." Jurat certificates use "subscribed and sworn to before me." The word sworn is your signal that an oath and an in-presence signature are required.

Certificate phraseAct typeSignature timingOath?
"acknowledged before me"AcknowledgmentBefore or during appearanceNo
"subscribed and sworn to before me"JuratIn the notary's presenceYes

A practical trap: if a signer presents a pre-signed document bearing "subscribed and sworn" language, do not be tempted to accept the existing signature "to save time." The phrase itself certifies that the signing happened before you. Accepting a prior signature would make your own certificate false.

Test Your Knowledge

For which notarial act must the signer sign in the notary's presence?

A
B
C
D
Test Your Knowledge

A signer with a hand injury cannot write. How may the document be signed?

A
B
C
D