To include a power of attorney in your estate plan, you will need the POA document itself, which designates the agent and grants them specific powers. These documents are typically notarized to increase their credibility, especially if they involve real estate or if they need to be recorded with a county recorder's office. Notarization also helps institutions view the document as less suspicious compared to a document that is merely witnessed. For more information on the Need For Estate Planning In California, an initial consultation is your next best step.