Whether a notary can be a witness on a power of attorney depends on the state. A few states explicitly allow one person to do both jobs on the same document, some flatly prohibit it, and many say nothing at all. Because the consequences of an execution defect can be severe, most attorneys recommend using separate people for each role even where the law would let you combine them.
Why the Two Roles Exist Separately
A notary and a witness are doing different things at the signing table, even though both are watching the same pen.
The notary’s job is narrow. Verify the principal’s identity, usually by checking a driver’s license or passport. Confirm the signature is voluntary. Apply an official seal. The notary is an impartial state-commissioned officer, and one who has a direct financial interest in the transaction is generally disqualified from performing the notarization at all.
A witness does something the notary doesn’t. The witness observes the signing and attests that the principal appeared to understand what they were doing and wasn’t being pressured. A witness doesn’t check ID. Their value is being able to testify later, if the document is challenged, that the principal seemed mentally capable and was acting voluntarily.
Both people are present for the same act, but one is focused on identity and the other on capacity and voluntariness. That’s why many states want the roles filled by different people.
Does Your State Even Require Witnesses?
Before the dual-role question matters, check whether witnesses are required at all. Many states don’t require them for a financial POA. Over 30 states have adopted the Uniform Power of Attorney Act, which requires the principal’s signature to be acknowledged before a notary but doesn’t separately require witnesses.1Mississippi Secretary of State. Uniform Power of Attorney Act In those states, there’s no witness slot to fill, so the question of whether the notary can double up is moot.
State execution rules generally fall into three patterns:
- Notarization only. Most Uniform Power of Attorney Act states. If the principal’s signature is acknowledged before a notary, the POA is properly executed.
- Witnesses or notarization. A few states let you pick one path or the other.
- Witnesses and notarization. Several states require the principal to sign in front of two witnesses and have the document notarized. This is where the dual-role question actually bites, because you need people filling both roles at the same signing.
Your state’s POA statute controls which category applies. Attorney-drafted forms and reputable online templates usually signal the answer by whether they include witness signature lines.
Where the Dual Role Is Allowed, Prohibited, or Unclear
In states that require both witnesses and a notary, whether the notary can count as one of the witnesses depends entirely on state law, and the landscape is genuinely split.
States That Permit It
Several states explicitly allow the notary to also serve as a witness on the same POA. The permission appears either in the POA statute itself or in the state’s notary laws. In a state requiring two witnesses plus a notary, that means you could get by with the notary and one additional witness, because the notary counts as the second one.
States That Prohibit It
Other states specifically bar the notary from doubling as a witness. Some do this through the POA statute, listing notaries among people who cannot witness. Others reach the same result through general notary laws that prevent a notary from serving in any additional capacity on the same document. In these states, having the notary sign as a witness leaves the POA one witness short of what the law requires, which can invalidate the document.
States That Are Silent
Many state POA statutes require witnesses and notarization but never address whether the same person can do both. Where the law is ambiguous, legal professionals almost universally treat it as a prohibition. Bringing one extra person to the signing costs nothing. Having a POA thrown out years later, when the principal can no longer sign a corrected version, can cost a great deal.
Who Cannot Serve as a Witness at All
Even where a notary is allowed to double as a witness, the notary still has to meet the general qualifications for a witness. Several categories of people are typically disqualified regardless of state:
- The agent or any alternate agent. The person receiving the power cannot witness the document that grants it. This is the most universal restriction.
- Close relatives of the principal. Many states prohibit the principal’s spouse, children, parents, or siblings from witnessing, because family members may have a financial interest or may have influenced the signing.
- Anyone entitled to inherit from the principal, whether by will or intestate succession.
- Minors. Witnesses must be adults, with 18 as the standard threshold.
The common thread is disinterest. A witness shouldn’t benefit from the POA and shouldn’t have a relationship with the principal that could look like undue influence. A neighbor, coworker, or unrelated friend is usually ideal.
Healthcare POAs Have Stricter Witness Rules
A healthcare power of attorney, sometimes called a healthcare proxy or medical POA, carries tighter witness restrictions than a financial POA. The reason is straightforward: a healthcare POA covers life-and-death decisions, and the law works harder to make sure the principal’s wishes are genuinely their own.
The Uniform Health-Care Decisions Act, which many states have adopted or used as a model, requires a healthcare POA to be signed by at least one adult witness who reasonably believes the principal is acting voluntarily and knowingly. That witness cannot be the appointed agent, the agent’s spouse or cohabitant, or an owner, operator, employee, or contractor of a nursing home or residential care facility where the principal lives or receives care.2Utah Courts. Uniform Health-Care Decisions Act (2023)
Some states go further, disqualifying attending physicians, social workers assigned to the principal’s case, and anyone financially responsible for the principal’s medical costs. These restrictions exist because healthcare settings create pressure dynamics that would be hard to detect after the fact. For a healthcare POA, use witnesses who have no connection to your medical care, your care facility, or your estate.
What Happens If the POA Is Improperly Executed
A witnessing or notarization defect isn’t a technical blemish. It can make the POA unusable at the exact moment the principal needs it.
Financial institutions are cautious about POAs, and an execution defect gives them an easy reason to reject the document. When a bank flags a witness or notary problem, the agent is stuck: the principal may already be incapacitated and unable to sign a corrected version. Under the Uniform Power of Attorney Act, a financial institution must accept a properly executed POA or request additional documentation within seven business days, but those protections apply only when the POA was properly acknowledged in the first place.3Mississippi Secretary of State. Uniform Power of Attorney Act – Section 120 A defective POA doesn’t qualify.
When a POA is invalid and the principal can no longer manage their own affairs, someone usually has to petition a court for guardianship or conservatorship. That’s the outcome a POA is meant to prevent. Guardianship proceedings are expensive and public, and the court, not the principal, chooses the person who will manage their finances and care.
The Safe Way to Handle the Signing
Use separate people for the notary and each witness. Even in states that clearly allow the notary to double up, using different individuals removes one avenue of challenge and costs nothing extra. Witnesses should be adults with no family relationship to you, no stake in your estate, and no connection to your appointed agent. For a healthcare POA, add one more filter: no connection to any facility involved in your care.
If you’re signing a POA while outside your home state, execute it under the rules of the state where it will actually be used. A document meant for a state that requires two witnesses doesn’t pick up those witnesses just because you happened to sign it somewhere with looser rules.