A power of attorney letter includes the name of the individual designating power of attorney, the details regarding what the power of attorney may control, such as medical or financial decisions, a signature and date. The power of attorney letter must be notarized, according to Minnesota Judicial Branch.
The person designating power of attorney within a signed, notarized letter must also include the signature of the person designated as the power of attorney, who is commonly referred to as the agent, according to the American Bar Association. A power-of-attorney letter provides the agent with the power to act on an individual's behalf immediately, or in the future when a person is unable to advocate for himself due to physical or mental disability. In some cases, individuals appoint a power of attorney to handle financial matters when they are unable to be physically present. For example, a power of attorney may be provided the power to sign for the purchase or sale of a home in the absence of the owner.
Power of attorney letters may also list a time frame in which the agent has decision-making power, making the designation temporary or permanent. A power of attorney letter may be modified or dissolved at any time, should the individual wish to nullify the contract or appoint a new agent, according to the American Bar Association.