Write a formal letter to your agent, informing him that you’re revoking your power of attorney. State in the letter that you require him to return the POA to you, as well as any of your financial records he might have in his possession. Forward the letter by certified mail, return receipt requested, so you have a record that he received it. Mail copies simultaneously to all banks, financial institutions, and other business entities you authorized your agent to deal with on your behalf. You might also consider hand-delivering them, and having the institutions sign acknowledgments of receipt.
Speak with your agent to advise him of the change. Although it’s not legally required that you meet with him face-to-face in addition to mailing him notice, if you still value your relationship with this individual, you might want to give him the courtesy of telling him in person, before he receives notice out of the blue with a written letter.
Write a revocation. Making your intentions clear is usually more important than the actual format. State your name, the name of your agent, and the date you granted him power of attorney. State that you’re of sound mind. Include explicit language that you’re revoking your POA and that you do not intend that your agent should have any legal authority to act on your behalf after the date of your revocation. Not all states require that you have your revocation witnessed and notarized, but it won’t invalidate it if you do, and this gives you an added layer of protection that the document will be honored.
Distribute your written revocation to your agent and to all business entities you authorized him to deal with. You can do this the same way you dealt with your initial letter that indicated your intention to revoke the POA, sending it by certified mail or hand-delivering copies. Some banks and lending institutions have additional rules for revocations, so when you deliver your document, speak with a bank officer or other representative to find out if you need to do anything more.
Create a new power of attorney. Unless you want to change the terms of your previous POA as well as the person you’re naming as agent, you can simply copy from your old one, replacing your old agent's name and identifying information with the name and information of your new agent. However, you should state again in your new POA that you’re revoking the old one. Attach an additional copy of your revocation to your new POA and distribute the document to all entities you're empowering your new agent to deal with.