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Key Facts
- State level: A power of attorney is a document authorizing another person, called an agent or attorney-in-fact, to act for the principal.
- State level: The document defines the agent’s authority, which may be broad or limited and immediate or triggered by a future event.
- State level: Durable authority is designed to continue despite the principal’s later incapacity, subject to governing law and the document.
- State level: Execution and termination rules differ by state.
A power of attorney, often shortened to POA, is a legal document that lets another person act on the principal’s behalf. The principal grants the authority. The person receiving it is commonly called the agent or attorney-in-fact.
A power of attorney transfers authority, not ownership
The agent acts for the principal within the authority stated in the document and allowed by governing law. A limited power may cover one transaction, while a general power may cover a wider range of financial and legal matters. Authority can begin immediately or upon a future event identified in the document.
The title “attorney-in-fact” does not mean the agent is a lawyer. It identifies the person appointed to act under the POA.
Durable and medical powers serve different functions
A durable power of attorney is designed not to terminate merely because the principal later becomes incapacitated. Durability depends on the governing statute and the document’s terms.
A financial POA can authorize transactions involving money, property, or business affairs. A medical power of attorney or health-care proxy concerns authority to make health-care decisions when its legal conditions are met. State terminology and formalities vary.
The document controls the scope
The ABA explains that authority may be limited to a particular activity or may be general. It may be temporary or continuing. A valid agent may take only actions permitted by the instrument and applicable law.
For signatures, the ABA illustrates forms that identify both people and the representative capacity, such as the principal’s name followed by the agent’s name under POA, or the agent signing as attorney-in-fact for the principal. The governing document and recipient requirements still matter.
State execution rules are not uniform
California provides one concrete example. Probate Code section 4121 requires a date, an authorized signature for the principal, and either notarization or two qualifying witnesses for legal sufficiency.
When witnesses are used in California, section 4122 requires them to be adults. The attorney-in-fact cannot serve as a witness, and each witness must observe the principal’s signing or acknowledgment.
These California requirements illustrate state variation; they are not a national signing formula.
A POA is not authority after death by default
The ABA glossary states that a power of attorney generally terminates at the principal’s death, apart from the identified “coupled with an interest” exception. California section 4152 likewise lists the principal’s death as a termination event, except for specific authority that another statute permits after death.
A power of attorney therefore performs a lifetime agency function. It is distinct from authority belonging to an executor or other estate representative after death.
The meaning comes from three layers
The plain-English definition identifies the relationship: principal, agent, and delegated authority. The operative answer then comes from the signed document, the governing state’s current law, and the particular act the agent proposes to perform.
