When Do I Need a Notary, a Witness, or Both? A California Guide

If you've ever looked closely at the signing instructions for a legal document and noticed a line for a witness and a line for a notary, you may have wondered — aren't those doing the same thing?

It's a question I hear often, and the honest answer is, "No, they're not."

A notary and signing witnesses serve very different purposes, and California law is specific about which documents require one, the other, or both. Getting this wrong can invalidate a document entirely, which is why I always walk my clients through the requirements before any signing begins.

What a Notary Does vs. What a Witness Does

A notary public — like me — is a state-commissioned official whose job is to verify your identity and confirm that you signed a document willingly and of your own free will. Their authority comes from the state. To complete a signing, the notary stamps the document, signs it, and creates an official record of the transaction.

A witness, on the other hand, is simply someone who watches you sign and attests that you appeared to be of sound mind, were not under duress, and signed voluntarily. Witnesses don't verify your identity the way a notary does — they just observe and sign their own name confirming what they saw. Their authority comes from their presence and personal knowledge of the event.

The reason both sometimes exist is that they protect against different kinds of problems. Notarization deters identity fraud. Witnesses provide a human account of the circumstances surrounding the signing. Together, they provide legal protections for the signer and their document.

Documents That Require Notarization But Not Witnesses

Many of the most common documents Mark notarizes in Los Angeles County fall into this category. Real estate deeds — including grant deeds, quitclaim deeds, and trust transfer deeds — must be notarized before they can be recorded with the county. However, California law does not require independent witnesses for these documents. The same is true for most affidavits, vehicle title transfers, and the majority of standard financial or business agreements. For these, my notarization is all that's needed.

Documents That Require Witnesses But Not Necessarily Notarization

This surprises many people: a traditional California will does not need to be notarized to be legally valid. What it does require is two adult witnesses who watch the signing at the same time, both sign the will themselves, and are not named as beneficiaries in the will. California Probate Code is clear that a disinterested witness — not a notary stamp — is the primary safeguard for a will. Mark can notarize a will if asked, and doing so can help create a "self-proving" will that may simplify the probate process, but the notarization alone without proper witnesses does not satisfy California's requirements for a valid will.

Documents That Require Both

Some documents require both notarization and witnesses, and this is where the details really matter.

An Advance Health Care Directive (AHCD) — the document that gives someone authority to make medical decisions on your behalf — can be executed in California using either two witnesses or notarization, but not a combination of just any witness and any notary. If witnesses are used, California Health and Safety Code requires that they meet strict criteria: neither witness can be the person's health care agent, a health care provider, an operator or employee of a care facility where the person is a patient, related to the person by blood, marriage, or adoption, or entitled to any part of the person's estate. When notarization is used instead of witnesses, it must be performed by a commissioned California notary.

A Durable Power of Attorney for financial matters under California Probate Code Section 4121 requires either notarization or the signatures of two adult witnesses — though notarization is the standard most title companies, financial institutions, and third parties expect and accept.

When in doubt, Mark recommends notarization for financial POAs precisely because it carries the most universal recognition.

PLEASE NOTE: The Skilled Nursing Facility Exception

As Mark always makes a point of flagging, residents of Skilled Nursing Facilities face additional requirements under California Probate Code Section 4675 when signing an Advance Health Care Directive. In that case, one of the required witnesses must be a state-certified Patient Advocate or Ombudsman — a rule that exists specifically to protect vulnerable residents from undue influence. This requirement applies regardless of whether notarization is also involved.

Why This Matters and How Mark Helps

The consequences of getting witness and notarization requirements wrong can be serious. A will signed without proper witnesses may be contested or invalidated in probate. An AHCD without the correct execution may not be honored in a medical emergency. A financial POA that doesn't meet California standards may be rejected by a bank or court.

"What about other states?" — A document executed in California that will ultimately be used, filed, or recognized in another state may be subject to that state's rules — which could require witnesses for documents California doesn't, or notarization for documents California leaves optional.

For example, some states require a will to be notarized in addition to being witnessed, and certain financial or real estate documents that need no witnesses in California may require one or two in other jurisdictions. When there's any chance a document will cross state lines, Mark will often recommend proceeding with both notarization and witnesses as a precaution — a little extra effort upfront is far less painful than having a document rejected down the road because it didn't meet the requirements of the state where it was ultimately used.

My value as an experienced California Notary Public isn't just in showing up with my stamp. It's in knowing these requirements cold — and making sure that by the time a document leaves his hands, it's been executed exactly the way California law demands, with an eye toward wherever that document might need to go next.

For anyone in Los Angeles County navigating a complex signing, that kind of expertise is worth its weight in gold.

CONTACT MARK HERE