An additional witness for legal documents is someone who observes the signing of the document and provides their signature to confirm that they witnessed the signing. This individual aids in authenticating the document and ensures that all parties involved understood and agreed to its contents. The inclusion of additional witnesses may be legally required for certain types of documents, such as wills or contracts, to establish their validity.
When it comes to power of attorney requirements, an additional witness can typically be anyone who is legally competent and not directly involved with the document. This means they should:
- Be at least 18 years old.
- Be of sound mind.
- Not have a vested interest in the power of attorney (e.g., they should neither be the agent nor a family member of the principal).
It is crucial to consult local laws as power of attorney requirements can differ by jurisdiction. In some areas, specific qualifications may apply to additional witnesses, such as being a notary public or having no financial stake in the document.

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Please be advised:
Effective September 12, 2026, an Arizona notary must obtain the signer’s fingerprint in the notary journal when notarizing:
The signer must place their right thumbprint in the journal. If the right thumb is unavailable, the notary may use:
The notary must indicate in the journal which finger was used.
AZ Senate Bill 1479