Power of Attorney (POA) Documents: If a client grants the accounting firm permission to act on their behalf before tax authorities or sign tax documents for them, a Power of Attorney document may need to undergo notarization.

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Legal Agreements: In some cases, tax-related agreements or contracts between the accounting firm and its clients may require notarization for added legal validity or enforceability.

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Affidavits or Sworn Statements: If clients need to provide sworn statements or affidavits related to their tax matters, notarization may be required to confirm the authenticity and validity of the statements.

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State or Local Tax Forms: Certain state or local tax forms may mandate notarization of signatures or specific declarations.