Revocation of a power of attorney must be in writing. However, if you only want to revoke your agent’s authority, you can do so orally or in writing. This can allow you to remove an agent and have a successor agent replace them without drafting a new power of attorney.
Although not required, it is a good idea to have the revocation in writing and give the revocation to your agent and any businesses or people your agent has worked with on your behalf.
An agent’s authority is revoked automatically when the principal dies or if the agent and principal divorce.